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SubjectRe: [PATCH v1 03/10] v4l: platform: Add Renesas CEU driver
From
Date
On 15/11/17 11:55, Jacopo Mondi wrote:
> Add driver for Renesas Capture Engine Unit (CEU).
>
> The CEU interface supports capturing 'data' (YUV422) and 'images'
> (NV[12|21|16|61]).
>
> This driver aims to replace the soc_camera based sh_mobile_ceu one.
>
> Tested with ov7670 camera sensor, providing YUYV_2X8 data on Renesas RZ
> platform GR-Peach.
>
> Tested with ov7725 camera sensor on SH4 platform Migo-R.
>
> Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
> ---
> drivers/media/platform/Kconfig | 9 +
> drivers/media/platform/Makefile | 2 +
> drivers/media/platform/renesas-ceu.c | 1768 ++++++++++++++++++++++++++++++++++
> 3 files changed, 1779 insertions(+)
> create mode 100644 drivers/media/platform/renesas-ceu.c
>
> diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
> index 3c4f7fa..401caea 100644
> --- a/drivers/media/platform/Kconfig
> +++ b/drivers/media/platform/Kconfig
> @@ -144,6 +144,15 @@ config VIDEO_STM32_DCMI
> To compile this driver as a module, choose M here: the module
> will be called stm32-dcmi.
>
> +config VIDEO_RENESAS_CEU
> + tristate "Renesas Capture Engine Unit (CEU) driver"
> + depends on VIDEO_DEV && VIDEO_V4L2 && HAS_DMA
> + depends on ARCH_SHMOBILE || ARCH_R7S72100 || COMPILE_TEST
> + select VIDEOBUF2_DMA_CONTIG
> + select V4L2_FWNODE
> + ---help---
> + This is a v4l2 driver for the Renesas CEU Interface
> +
> source "drivers/media/platform/soc_camera/Kconfig"
> source "drivers/media/platform/exynos4-is/Kconfig"
> source "drivers/media/platform/am437x/Kconfig"
> diff --git a/drivers/media/platform/Makefile b/drivers/media/platform/Makefile
> index 327f80a..0d1f02b 100644
> --- a/drivers/media/platform/Makefile
> +++ b/drivers/media/platform/Makefile
> @@ -27,6 +27,8 @@ obj-$(CONFIG_VIDEO_CODA) += coda/
>
> obj-$(CONFIG_VIDEO_SH_VEU) += sh_veu.o
>
> +obj-$(CONFIG_VIDEO_RENESAS_CEU) += renesas-ceu.o
> +
> obj-$(CONFIG_VIDEO_MEM2MEM_DEINTERLACE) += m2m-deinterlace.o
>
> obj-$(CONFIG_VIDEO_MUX) += video-mux.o
> diff --git a/drivers/media/platform/renesas-ceu.c b/drivers/media/platform/renesas-ceu.c
> new file mode 100644
> index 0000000..aaba3cd
> --- /dev/null
> +++ b/drivers/media/platform/renesas-ceu.c
> @@ -0,0 +1,1768 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * V4L2 Driver for Renesas Capture Engine Unit (CEU) interface
> + *
> + * Copyright (C) 2017 Jacopo Mondi <jacopo+renesas@jmondi.org>
> + *
> + * Based on soc-camera driver "soc_camera/sh_mobile_ceu_camera.c"
> + * Copyright (C) 2008 Magnus Damm
> + *
> + * Based on V4L2 Driver for PXA camera host - "pxa_camera.c",
> + * Copyright (C) 2006, Sascha Hauer, Pengutronix
> + * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + */
> +
> +#include <linux/completion.h>
> +#include <linux/delay.h>
> +#include <linux/device.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/err.h>
> +#include <linux/errno.h>
> +#include <linux/io.h>
> +#include <linux/init.h>
> +#include <linux/interrupt.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/mm.h>
> +#include <linux/of.h>
> +#include <linux/of_graph.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/slab.h>
> +#include <linux/time.h>
> +#include <linux/videodev2.h>
> +
> +#include <media/v4l2-async.h>
> +#include <media/v4l2-common.h>
> +#include <media/v4l2-device.h>
> +#include <media/v4l2-dev.h>
> +#include <media/v4l2-fwnode.h>
> +#include <media/v4l2-ioctl.h>
> +#include <media/v4l2-image-sizes.h>
> +#include <media/v4l2-mediabus.h>
> +#include <media/videobuf2-dma-contig.h>
> +
> +#include <media/drv-intf/renesas-ceu.h>
> +
> +#define DRIVER_NAME "renesas-ceu"
> +
> +/* ----------------------------------------------------------------------------
> + * CEU registers offsets and masks
> + */
> +#define CEU_CAPSR 0x00 /* Capture start register */
> +#define CEU_CAPCR 0x04 /* Capture control register */
> +#define CEU_CAMCR 0x08 /* Capture interface control register */
> +#define CEU_CAMOR 0x10 /* Capture interface offset register */
> +#define CEU_CAPWR 0x14 /* Capture interface width register */
> +#define CEU_CAIFR 0x18 /* Capture interface input format register */
> +#define CEU_CRCNTR 0x28 /* CEU register control register */
> +#define CEU_CRCMPR 0x2c /* CEU register forcible control register */
> +#define CEU_CFLCR 0x30 /* Capture filter control register */
> +#define CEU_CFSZR 0x34 /* Capture filter size clip register */
> +#define CEU_CDWDR 0x38 /* Capture destination width register */
> +#define CEU_CDAYR 0x3c /* Capture data address Y register */
> +#define CEU_CDACR 0x40 /* Capture data address C register */
> +#define CEU_CFWCR 0x5c /* Firewall operation control register */
> +#define CEU_CDOCR 0x64 /* Capture data output control register */
> +#define CEU_CEIER 0x70 /* Capture event interrupt enable register */
> +#define CEU_CETCR 0x74 /* Capture event flag clear register */
> +#define CEU_CSTSR 0x7c /* Capture status register */
> +#define CEU_CSRTR 0x80 /* Capture software reset register */
> +
> +/* Data synchronous fetch mode */
> +#define CEU_CAMCR_JPEG BIT(4)
> +
> +/* Input components ordering: CEU_CAMCR.DTARY field */
> +#define CEU_CAMCR_DTARY_8_UYVY (0x00 << 8)
> +#define CEU_CAMCR_DTARY_8_VYUY (0x01 << 8)
> +#define CEU_CAMCR_DTARY_8_YUYV (0x02 << 8)
> +#define CEU_CAMCR_DTARY_8_YVYU (0x03 << 8)
> +/* TODO: input components ordering for 16 bits input */
> +
> +/* Bus transfer MTU */
> +#define CEU_CAPCR_BUS_WIDTH256 (0x3 << 20)
> +
> +/* Bus width configuration */
> +#define CEU_CAMCR_DTIF_16BITS BIT(12)
> +
> +/* No downsampling to planar YUV420 in image fetch mode */
> +#define CEU_CDOCR_NO_DOWSAMPLE BIT(4)
> +
> +/* Swap all input data in 8-bit, 16-bits and 32-bits units (Figure 46.45) */
> +#define CEU_CDOCR_SWAP_ENDIANNESS (7)
> +
> +/* Capture reset and enable bits */
> +#define CEU_CAPSR_CPKIL BIT(16)
> +#define CEU_CAPSR_CE BIT(0)
> +
> +/* CEU operating flag bit */
> +#define CEU_CAPCR_CTNCP BIT(16)
> +#define CEU_CSTRST_CPTON BIT(1)
> +
> +/* Acknowledge magical interrupt sources */
> +#define CEU_CETCR_MAGIC 0x0317f313
> +/* Prohibited register access interrupt bit */
> +#define CEU_CETCR_IGRW BIT(4)
> +/* One-frame capture end interrupt */
> +#define CEU_CEIER_CPE BIT(0)
> +/* VBP error */
> +#define CEU_CEIER_VBP BIT(20)
> +#define CEU_CEIER_MASK (CEU_CEIER_CPE | CEU_CEIER_VBP)
> +
> +/* mbus configuration flags */
> +#define CEU_BUS_FLAGS (V4L2_MBUS_MASTER | \
> + V4L2_MBUS_PCLK_SAMPLE_RISING | \
> + V4L2_MBUS_HSYNC_ACTIVE_HIGH | \
> + V4L2_MBUS_HSYNC_ACTIVE_LOW | \
> + V4L2_MBUS_VSYNC_ACTIVE_HIGH | \
> + V4L2_MBUS_VSYNC_ACTIVE_LOW | \
> + V4L2_MBUS_DATA_ACTIVE_HIGH)
> +
> +#define CEU_MAX_WIDTH 2560
> +#define CEU_MAX_HEIGHT 1920
> +#define CEU_W_MAX(w) ((w) < CEU_MAX_WIDTH ? (w) : CEU_MAX_WIDTH)
> +#define CEU_H_MAX(h) ((h) < CEU_MAX_HEIGHT ? (h) : CEU_MAX_HEIGHT)
> +
> +/* ----------------------------------------------------------------------------
> + * CEU formats
> + */
> +
> +/**
> + * ceu_bus_fmt - describe a 8-bits yuyv format the sensor can produce
> + *
> + * @mbus_code: bus format code
> + * @fmt_order: CEU_CAMCR.DTARY ordering of input components (Y, Cb, Cr)
> + * @fmt_order_swap: swapped CEU_CAMCR.DTARY ordering of input components
> + * (Y, Cr, Cb)
> + * @swapped: does Cr appear before Cb?
> + * @bps: number of bits sent over bus for each sample
> + * @bpp: number of bits per pixels unit
> + */
> +struct ceu_mbus_fmt {
> + u32 mbus_code;
> + u32 fmt_order;
> + u32 fmt_order_swap;
> + bool swapped;
> + u8 bps;
> + u8 bpp;
> +};
> +
> +/**
> + * ceu_buffer - Link vb2 buffer to the list of available buffers
> + */
> +struct ceu_buffer {
> + struct vb2_v4l2_buffer vb;
> + struct list_head queue;
> +};
> +
> +static inline struct ceu_buffer *vb2_to_ceu(struct vb2_v4l2_buffer *vbuf)
> +{
> + return container_of(vbuf, struct ceu_buffer, vb);
> +}
> +
> +/**
> + * ceu_subdev - Wraps v4l2 sub-device and provides async subdevice.
> + */
> +struct ceu_subdev {
> + struct v4l2_subdev *v4l2_sd;
> + struct v4l2_async_subdev asd;
> +
> + /* per-subdevice mbus configuration options */
> + unsigned int mbus_flags;
> + struct ceu_mbus_fmt mbus_fmt;
> +};
> +
> +static struct ceu_subdev *to_ceu_subdev(struct v4l2_async_subdev *asd)
> +{
> + return container_of(asd, struct ceu_subdev, asd);
> +}
> +
> +/**
> + * ceu_device - CEU device instance
> + */
> +struct ceu_device {
> + struct device *dev;
> + struct video_device vdev;
> + struct v4l2_device v4l2_dev;
> +
> + /* subdevices descriptors */
> + struct ceu_subdev *subdevs;
> + /* the subdevice currently in use */
> + struct ceu_subdev *sd;
> + unsigned int sd_index;
> + unsigned int num_sd;
> +
> + /* currently configured field and pixel format */
> + enum v4l2_field field;
> + struct v4l2_pix_format_mplane v4l2_pix;
> +
> + /* async subdev notification helpers */
> + struct v4l2_async_notifier notifier;
> + /* pointers to "struct ceu_subdevice -> asd" */
> + struct v4l2_async_subdev **asds;
> +
> + /* vb2 queue, capture buffer list and active buffer pointer */
> + struct vb2_queue vb2_vq;
> + struct list_head capture;
> + struct vb2_v4l2_buffer *active;
> + unsigned int sequence;
> +
> + /* mlock - locks on open/close and vb2 operations */
> + struct mutex mlock;
> +
> + /* lock - lock access to capture buffer queue and active buffer */
> + spinlock_t lock;
> +
> + /* base - CEU memory base address */
> + void __iomem *base;
> +};
> +
> +static inline struct ceu_device *v4l2_to_ceu(struct v4l2_device *v4l2_dev)
> +{
> + return container_of(v4l2_dev, struct ceu_device, v4l2_dev);
> +}
> +
> +/* ----------------------------------------------------------------------------
> + * CEU memory output formats
> + */
> +
> +/**
> + * ceu_fmt - describe a memory output format supported by CEU interface
> + *
> + * @fourcc: memory layout fourcc format code
> + * @bpp: bit for each pixel stored in memory
> + */
> +struct ceu_fmt {
> + u32 fourcc;
> + u8 bpp;
> +};
> +
> +/**
> + * ceu_format_list - List of supported memory output formats
> + *
> + * If sensor provides any YUYV bus format, all the following planar memory
> + * formats are available thanks to CEU re-ordering and sub-sampling
> + * capabilities.
> + */
> +static const struct ceu_fmt ceu_fmt_list[] = {
> + {
> + .fourcc = V4L2_PIX_FMT_NV16,
> + .bpp = 16,
> + },
> + {
> + .fourcc = V4L2_PIX_FMT_NV61,
> + .bpp = 16,
> + },
> + {
> + .fourcc = V4L2_PIX_FMT_NV12,
> + .bpp = 12,
> + },
> + {
> + .fourcc = V4L2_PIX_FMT_NV21,
> + .bpp = 12,
> + },
> + {
> + .fourcc = V4L2_PIX_FMT_YUYV,
> + .bpp = 16,
> + },
> +};
> +
> +static const struct ceu_fmt *get_ceu_fmt_from_fourcc(unsigned int fourcc)
> +{
> + const struct ceu_fmt *fmt = &ceu_fmt_list[0];
> + unsigned int i;
> +
> + for (i = 0; i < ARRAY_SIZE(ceu_fmt_list); i++, fmt++)
> + if (fmt->fourcc == fourcc)
> + return fmt;
> +
> + return NULL;
> +}
> +
> +static inline bool ceu_is_fmt_planar(struct v4l2_pix_format_mplane *pix)
> +{
> + switch (pix->pixelformat) {
> + case V4L2_PIX_FMT_YUYV:
> + return false;
> + case V4L2_PIX_FMT_NV16:
> + case V4L2_PIX_FMT_NV61:
> + case V4L2_PIX_FMT_NV12:
> + case V4L2_PIX_FMT_NV21:
> + return true;
> + }
> +
> + return true;
> +}
> +
> +/* ----------------------------------------------------------------------------
> + * CEU HW operations
> + */
> +static void ceu_write(struct ceu_device *priv, unsigned int reg_offs, u32 data)
> +{
> + iowrite32(data, priv->base + reg_offs);
> +}
> +
> +static u32 ceu_read(struct ceu_device *priv, unsigned int reg_offs)
> +{
> + return ioread32(priv->base + reg_offs);
> +}
> +
> +/**
> + * ceu_soft_reset() - Software reset the CEU interface
> + */
> +static int ceu_soft_reset(struct ceu_device *ceudev)
> +{
> + unsigned int reset_done;
> + unsigned int i;
> +
> + ceu_write(ceudev, CEU_CAPSR, CEU_CAPSR_CPKIL);
> +
> + reset_done = 0;
> + for (i = 0; i < 1000 && !reset_done; i++) {
> + udelay(1);
> + if (!(ceu_read(ceudev, CEU_CSTSR) & CEU_CSTRST_CPTON))
> + reset_done++;
> + }
> +
> + if (!reset_done) {
> + v4l2_err(&ceudev->v4l2_dev, "soft reset time out\n");
> + return -EIO;
> + }
> +
> + reset_done = 0;
> + for (i = 0; i < 1000; i++) {
> + udelay(1);
> + if (!(ceu_read(ceudev, CEU_CAPSR) & CEU_CAPSR_CPKIL))
> + return 0;
> + }
> +
> + /* if we get here, CEU has not reset properly */
> + return -EIO;
> +}
> +
> +/* ----------------------------------------------------------------------------
> + * CEU Capture Operations
> + */
> +
> +/**
> + * ceu_capture() - Trigger start of a capture sequence
> + *
> + * Return value doesn't reflect the success/failure to queue the new buffer,
> + * but rather the status of the previous capture.
> + */
> +static int ceu_capture(struct ceu_device *ceudev)
> +{
> + struct v4l2_pix_format_mplane *pix = &ceudev->v4l2_pix;
> + dma_addr_t phys_addr_top;
> + u32 status;
> +
> + /* Clean interrupt status and re-enable interrupts */
> + status = ceu_read(ceudev, CEU_CETCR);
> + ceu_write(ceudev, CEU_CEIER,
> + ceu_read(ceudev, CEU_CEIER) & ~CEU_CEIER_MASK);
> + ceu_write(ceudev, CEU_CETCR, ~status & CEU_CETCR_MAGIC);
> + ceu_write(ceudev, CEU_CEIER, CEU_CEIER_MASK);
> + ceu_write(ceudev, CEU_CAPCR,
> + ceu_read(ceudev, CEU_CAPCR) & ~CEU_CAPCR_CTNCP);
> +
> + /*
> + * When a VBP interrupt occurs, a capture end interrupt does not occur
> + * and the image of that frame is not captured correctly.
> + */
> + if (status & CEU_CEIER_VBP) {
> + v4l2_err(&ceudev->v4l2_dev,
> + "VBP interrupt while capturing\n");
> + ceu_soft_reset(ceudev);
> + return -EIO;
> + } else if (!ceudev->active) {
> + v4l2_err(&ceudev->v4l2_dev,
> + "No available buffers for capture\n");
> + return -EINVAL;
> + }
> +
> + phys_addr_top =
> + vb2_dma_contig_plane_dma_addr(&ceudev->active->vb2_buf, 0);
> + ceu_write(ceudev, CEU_CDAYR, phys_addr_top);
> +
> + /* Ignore CbCr plane in data sync mode */
> + if (ceu_is_fmt_planar(pix)) {
> + phys_addr_top =
> + vb2_dma_contig_plane_dma_addr(&ceudev->active->vb2_buf,
> + 1);
> + ceu_write(ceudev, CEU_CDACR, phys_addr_top);
> + }
> +
> + /*
> + * Trigger new capture start: once per each frame, as we work in
> + * one-frame capture mode
> + */
> + ceu_write(ceudev, CEU_CAPSR, CEU_CAPSR_CE);
> +
> + return 0;
> +}
> +
> +static irqreturn_t ceu_irq(int irq, void *data)
> +{
> + struct ceu_device *ceudev = data;
> + struct vb2_v4l2_buffer *vbuf;
> + struct ceu_buffer *buf;
> + int ret;
> +
> + spin_lock(&ceudev->lock);
> + vbuf = ceudev->active;
> + if (!vbuf)
> + /* Stale interrupt from a released buffer */
> + goto out;
> +
> + /* Prepare a new 'active' buffer and trigger a new capture */
> + buf = vb2_to_ceu(vbuf);
> + vbuf->vb2_buf.timestamp = ktime_get_ns();
> +
> + if (!list_empty(&ceudev->capture)) {
> + buf = list_first_entry(&ceudev->capture, struct ceu_buffer,
> + queue);
> + list_del(&buf->queue);
> + ceudev->active = &buf->vb;
> + } else {
> + ceudev->active = NULL;
> + }
> +
> + /*
> + * If the new capture started successfully, mark the previous buffer
> + * as "DONE".
> + */
> + ret = ceu_capture(ceudev);
> + if (!ret) {
> + vbuf->field = ceudev->field;
> + vbuf->sequence = ceudev->sequence++;
> + }
> +
> + vb2_buffer_done(&vbuf->vb2_buf,
> + ret < 0 ? VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
> +
> +out:
> + spin_unlock(&ceudev->lock);
> +
> + return IRQ_HANDLED;
> +}
> +
> +/* ----------------------------------------------------------------------------
> + * CEU Videobuf operations
> + */
> +
> +/**
> + * ceu_calc_plane_sizes() - Fill 'struct v4l2_plane_pix_format' per plane
> + * information according to the currently configured
> + * pixel format.
> + */
> +static int ceu_calc_plane_sizes(struct ceu_device *ceudev,
> + const struct ceu_fmt *ceu_fmt,
> + struct v4l2_pix_format_mplane *pix)
> +{
> + struct v4l2_plane_pix_format *plane_fmt = &pix->plane_fmt[0];
> +
> + switch (pix->pixelformat) {
> + case V4L2_PIX_FMT_YUYV:
> + pix->num_planes = 1;
> + plane_fmt[0].bytesperline = pix->width * ceu_fmt->bpp / 8;
> + plane_fmt[0].sizeimage = pix->height *
> + plane_fmt[0].bytesperline;
> + break;
> + case V4L2_PIX_FMT_NV16:
> + case V4L2_PIX_FMT_NV61:
> + pix->num_planes = 2;
> + plane_fmt[0].bytesperline = pix->width;
> + plane_fmt[0].sizeimage = pix->height * pix->width;
> + plane_fmt[1] = plane_fmt[0];
> + break;
> + case V4L2_PIX_FMT_NV12:
> + case V4L2_PIX_FMT_NV21:
> + pix->num_planes = 2;
> + plane_fmt[0].bytesperline = pix->width;
> + plane_fmt[0].sizeimage = pix->height * pix->width;
> + plane_fmt[1].bytesperline = pix->width;
> + plane_fmt[1].sizeimage = pix->height * pix->width / 2;
> + break;
> + default:
> + pix->num_planes = 0;
> + v4l2_err(&ceudev->v4l2_dev,
> + "Format 0x%x not supported\n", pix->pixelformat);
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +/*
> + * ceu_videobuf_setup() - is called to check, whether the driver can accept the
> + * requested number of buffers and to fill in plane sizes
> + * for the current frame format, if required.
> + */
> +static int ceu_videobuf_setup(struct vb2_queue *vq, unsigned int *count,

A general request: can you replace all videobuf_ strings by vb2_?

'videobuf' generally refers to the first version of the videobuf framework (and
in fact, that's what soc_camera originally used), but I'd rather rename it here
so a grep on videobuf won't hit this driver.

> + unsigned int *num_planes, unsigned int sizes[],
> + struct device *alloc_devs[])
> +{
> + struct ceu_device *ceudev = vb2_get_drv_priv(vq);
> + struct v4l2_pix_format_mplane *pix = &ceudev->v4l2_pix;
> + unsigned int i;
> +
> + if (!vq->num_buffers)
> + ceudev->sequence = 0;
> +
> + if (!*count)
> + *count = 2;
> +
> + /* num_planes is set: just check plane sizes */
> + if (*num_planes) {
> + for (i = 0; i < pix->num_planes; i++) {
> + if (sizes[i] < pix->plane_fmt[i].sizeimage)
> + return -EINVAL;
> + }
> +
> + return 0;
> + }
> +
> + /* num_planes not set: called from REQBUFS, just set plane sizes */
> + *num_planes = pix->num_planes;
> + for (i = 0; i < pix->num_planes; i++)
> + sizes[i] = pix->plane_fmt[i].sizeimage;
> +
> + return 0;
> +}
> +
> +static void ceu_videobuf_queue(struct vb2_buffer *vb)
> +{
> + struct ceu_device *ceudev = vb2_get_drv_priv(vb->vb2_queue);
> + struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
> + struct v4l2_pix_format_mplane *pix = &ceudev->v4l2_pix;
> + struct ceu_buffer *buf = vb2_to_ceu(vbuf);
> + unsigned long irqflags;
> + unsigned int i;
> +
> + for (i = 0; i < pix->num_planes; i++) {
> + if (vb2_plane_size(vb, i) < pix->plane_fmt[i].sizeimage) {
> + v4l2_err(&ceudev->v4l2_dev,
> + "Buffer #%d too small (%lu < %u)\n",
> + vb->index, vb2_plane_size(vb, i),
> + pix->plane_fmt[i].sizeimage);
> + goto error;
> + }
> +
> + vb2_set_plane_payload(vb, i, pix->plane_fmt[i].sizeimage);
> + }
> +
> + spin_lock_irqsave(&ceudev->lock, irqflags);
> + list_add_tail(&buf->queue, &ceudev->capture);
> + spin_unlock_irqrestore(&ceudev->lock, irqflags);
> +
> + return;
> +
> +error:
> + vb2_buffer_done(vb, VB2_BUF_STATE_ERROR);
> +}
> +
> +static int ceu_start_streaming(struct vb2_queue *vq, unsigned int count)
> +{
> + struct ceu_device *ceudev = vb2_get_drv_priv(vq);
> + struct v4l2_subdev *v4l2_sd = ceudev->sd->v4l2_sd;
> + struct ceu_buffer *buf;
> + unsigned long irqflags;
> + int ret = 0;
> +
> + ret = v4l2_subdev_call(v4l2_sd, video, s_stream, 1);
> + if (ret && ret != -ENOIOCTLCMD) {
> + v4l2_err(&ceudev->v4l2_dev,
> + "Subdevice failed to start streaming: %d\n", ret);
> + goto error_return_bufs;
> + }
> +
> + spin_lock_irqsave(&ceudev->lock, irqflags);
> + ceudev->sequence = 0;
> +
> + if (ceudev->active) {
> + ret = -EINVAL;
> + spin_unlock_irqrestore(&ceudev->lock, irqflags);
> + goto error_stop_sensor;
> + }
> +
> + /* Grab the first available buffer and trigger the first capture. */
> + buf = list_first_entry(&ceudev->capture, struct ceu_buffer,
> + queue);
> + list_del(&buf->queue);
> +
> + ceudev->active = &buf->vb;
> + ret = ceu_capture(ceudev);
> + if (ret) {
> + spin_unlock_irqrestore(&ceudev->lock, irqflags);
> + goto error_stop_sensor;
> + }
> +
> + spin_unlock_irqrestore(&ceudev->lock, irqflags);
> +
> + return 0;
> +
> +error_stop_sensor:
> + v4l2_subdev_call(v4l2_sd, video, s_stream, 0);
> +
> +error_return_bufs:
> + spin_lock_irqsave(&ceudev->lock, irqflags);
> + list_for_each_entry(buf, &ceudev->capture, queue)
> + vb2_buffer_done(&ceudev->active->vb2_buf,
> + VB2_BUF_STATE_QUEUED);
> + ceudev->active = NULL;
> + spin_unlock_irqrestore(&ceudev->lock, irqflags);
> +
> + return ret;
> +}
> +
> +static void ceu_stop_streaming(struct vb2_queue *vq)
> +{
> + struct ceu_device *ceudev = vb2_get_drv_priv(vq);
> + struct v4l2_subdev *v4l2_sd = ceudev->sd->v4l2_sd;
> + struct ceu_buffer *buf;
> + unsigned long irqflags;
> +
> + v4l2_subdev_call(v4l2_sd, video, s_stream, 0);
> +
> + spin_lock_irqsave(&ceudev->lock, irqflags);
> + if (ceudev->active) {
> + vb2_buffer_done(&ceudev->active->vb2_buf,
> + VB2_BUF_STATE_ERROR);
> + ceudev->active = NULL;
> + }
> +
> + /* Release all queued buffers */
> + list_for_each_entry(buf, &ceudev->capture, queue)
> + vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
> + INIT_LIST_HEAD(&ceudev->capture);
> +
> + spin_unlock_irqrestore(&ceudev->lock, irqflags);
> +
> + ceu_soft_reset(ceudev);
> +}
> +
> +static const struct vb2_ops ceu_videobuf_ops = {
> + .queue_setup = ceu_videobuf_setup,
> + .buf_queue = ceu_videobuf_queue,
> + .wait_prepare = vb2_ops_wait_prepare,
> + .wait_finish = vb2_ops_wait_finish,
> + .start_streaming = ceu_start_streaming,
> + .stop_streaming = ceu_stop_streaming,
> +};
> +
> +/**
> + * ----------------------------------------------------------------------------
> + * CEU bus operations
> + */
> +static unsigned int ceu_mbus_config_compatible(
> + const struct v4l2_mbus_config *cfg,
> + unsigned int ceu_host_flags)
> +{
> + unsigned int common_flags = cfg->flags & ceu_host_flags;
> + bool hsync, vsync, pclk, data, mode;
> +
> + switch (cfg->type) {
> + case V4L2_MBUS_PARALLEL:
> + hsync = common_flags & (V4L2_MBUS_HSYNC_ACTIVE_HIGH |
> + V4L2_MBUS_HSYNC_ACTIVE_LOW);
> + vsync = common_flags & (V4L2_MBUS_VSYNC_ACTIVE_HIGH |
> + V4L2_MBUS_VSYNC_ACTIVE_LOW);
> + pclk = common_flags & (V4L2_MBUS_PCLK_SAMPLE_RISING |
> + V4L2_MBUS_PCLK_SAMPLE_FALLING);
> + data = common_flags & (V4L2_MBUS_DATA_ACTIVE_HIGH |
> + V4L2_MBUS_DATA_ACTIVE_LOW);
> + mode = common_flags & (V4L2_MBUS_MASTER | V4L2_MBUS_SLAVE);
> + break;
> + default:
> + return 0;
> + }
> +
> + return (hsync && vsync && pclk && data && mode) ? common_flags : 0;
> +}
> +
> +/**
> + * ceu_test_mbus_param() - test bus parameters against sensor provided ones.
> + *
> + * @return: < 0 for errors
> + * 0 if g_mbus_config is not supported,
> + * > 0 for bus configuration flags supported by (ceu AND sensor)
> + */
> +static int ceu_test_mbus_param(struct ceu_device *ceudev)
> +{
> + struct v4l2_subdev *sd = ceudev->sd->v4l2_sd;
> + unsigned long common_flags = CEU_BUS_FLAGS;
> + struct v4l2_mbus_config cfg = {
> + .type = V4L2_MBUS_PARALLEL,
> + };
> + int ret;
> +
> + ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);

If at all possible, don't call this. This information should just come from
the device tree.

I want to eventually remove the g/s_mbus_config, so I'd rather not keep it here.
The soc_camera driver is one of the very few drivers that use it (the other is
pxa_camera).

> + if (ret < 0 && ret != -ENOIOCTLCMD)
> + return ret;
> + else if (ret == -ENOIOCTLCMD)
> + return 0;
> +
> + common_flags = ceu_mbus_config_compatible(&cfg, common_flags);
> + if (!common_flags)
> + return -EINVAL;
> +
> + return common_flags;
> +}
> +
> +/**
> + * ceu_set_bus_params() - Configure CEU interface registers using bus
> + * parameters
> + */
> +static int ceu_set_bus_params(struct ceu_device *ceudev)
> +{
> + u32 camcr = 0, cdocr = 0, cfzsr = 0, cdwdr = 0, capwr = 0;
> + struct v4l2_pix_format_mplane *pix = &ceudev->v4l2_pix;
> + struct ceu_subdev *ceu_sd = ceudev->sd;
> + struct ceu_mbus_fmt *mbus_fmt = &ceu_sd->mbus_fmt;
> + struct v4l2_subdev *v4l2_sd = ceu_sd->v4l2_sd;
> + unsigned int mbus_flags = ceu_sd->mbus_flags;
> + unsigned long common_flags = CEU_BUS_FLAGS;
> + int ret;
> + struct v4l2_mbus_config cfg = {
> + .type = V4L2_MBUS_PARALLEL,
> + };
> +
> + /*
> + * If client doesn't implement g_mbus_config, we just use our
> + * platform data.
> + */
> + ret = ceu_test_mbus_param(ceudev);
> + if (ret < 0)
> + return ret;
> + else if (ret == 0)
> + common_flags = ceudev->sd->mbus_flags;
> + else
> + common_flags = ret;
> +
> + /*
> + * If the we can choose between multiple alternatives select
> + * active high polarities.
> + */
> + if ((common_flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH) &&
> + (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)) {
> + if (mbus_flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH)
> + common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_LOW;
> + else
> + common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_HIGH;
> + }
> +
> + if ((common_flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH) &&
> + (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)) {
> + if (mbus_flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH)
> + common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_LOW;
> + else
> + common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_HIGH;
> + }
> +
> + cfg.flags = common_flags;
> + ret = v4l2_subdev_call(v4l2_sd, video, s_mbus_config, &cfg);
> + if (ret < 0 && ret != -ENOIOCTLCMD)
> + return ret;
> +
> + /* Start configuring CEU registers */
> + ceu_write(ceudev, CEU_CAIFR, 0);
> + ceu_write(ceudev, CEU_CFWCR, 0);
> + ceu_write(ceudev, CEU_CRCNTR, 0);
> + ceu_write(ceudev, CEU_CRCMPR, 0);
> +
> + /* Set the frame capture period for both image capture and data sync */
> + capwr = (pix->height << 16) | pix->width * mbus_fmt->bpp / 8;
> +
> + /*
> + * Swap input data endianness by default.
> + * In data fetch mode bytes are received in chunks of 8 bytes.
> + * D0, D1, D2, D3, D4, D5, D6, D7 (D0 received first)
> + * The data is however by default written to memory in reverse order:
> + * D7, D6, D5, D4, D3, D2, D1, D0 (D7 written to lowest byte)
> + *
> + * Use CEU_CDOCR[2:0] to swap data ordering.
> + */
> + cdocr = CEU_CDOCR_SWAP_ENDIANNESS;
> +
> + /*
> + * Configure CAMCR and CDOCR:
> + * match input components ordering with memory output format and
> + * handle downsampling to YUV420.
> + *
> + * If the memory output planar format is 'swapped' (Cr before Cb) and
> + * input format is not, use the swapped version of CAMCR.DTARY.
> + *
> + * If the memory output planar format is not 'swapped' (Cb before Cr)
> + * and input format is, use the swapped version of CAMCR.DTARY.
> + *
> + * CEU by default downsample to planar YUV420 (CDCOR[4] = 0).
> + * If output is planar YUV422 set CDOCR[4] = 1
> + *
> + * No downsample for data fetch sync mode.
> + */
> + switch (pix->pixelformat) {
> + /* data fetch sync mode */
> + case V4L2_PIX_FMT_YUYV:
> + /* TODO: handle YUYV permutations through DTARY bits */
> + camcr |= CEU_CAMCR_JPEG;
> + cdocr |= CEU_CDOCR_NO_DOWSAMPLE;
> + cfzsr = (pix->height << 16) | pix->width;
> + cdwdr = pix->plane_fmt[0].bytesperline;
> + break;
> +
> + /* non-swapped planar image capture mode */
> + case V4L2_PIX_FMT_NV16:
> + cdocr |= CEU_CDOCR_NO_DOWSAMPLE;
> + case V4L2_PIX_FMT_NV12:
> + if (mbus_fmt->swapped)
> + camcr |= mbus_fmt->fmt_order_swap;
> + else
> + camcr |= mbus_fmt->fmt_order;
> +
> + cfzsr = (pix->height << 16) | pix->width;
> + cdwdr = pix->width;
> + break;
> +
> + /* swapped planar image capture mode */
> + case V4L2_PIX_FMT_NV61:
> + cdocr |= CEU_CDOCR_NO_DOWSAMPLE;
> + case V4L2_PIX_FMT_NV21:
> + if (mbus_fmt->swapped)
> + camcr |= mbus_fmt->fmt_order;
> + else
> + camcr |= mbus_fmt->fmt_order_swap;
> +
> + cfzsr = (pix->height << 16) | pix->width;
> + cdwdr = pix->width;
> + break;
> + }
> +
> + camcr |= common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW ? 1 << 1 : 0;
> + camcr |= common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW ? 1 << 0 : 0;
> +
> + /* TODO: handle 16 bit bus width with DTIF bit in CAMCR */
> + ceu_write(ceudev, CEU_CAMCR, camcr);
> + ceu_write(ceudev, CEU_CDOCR, cdocr);
> + ceu_write(ceudev, CEU_CAPCR, CEU_CAPCR_BUS_WIDTH256);
> +
> + /*
> + * TODO: make CAMOR offsets configurable.
> + * CAMOR wants to know the number of blanks between a VS/HS signal
> + * and valid data. This value should actually come from the sensor...
> + */
> + ceu_write(ceudev, CEU_CAMOR, 0);
> +
> + /* TODO: 16 bit bus width require re-calculation of cdwdr and cfzsr */
> + ceu_write(ceudev, CEU_CAPWR, capwr);
> + ceu_write(ceudev, CEU_CFSZR, cfzsr);
> + ceu_write(ceudev, CEU_CDWDR, cdwdr);
> +
> + return 0;
> +}
> +
> +/**
> + * ----------------------------------------------------------------------------
> + * CEU image formats handling
> + */
> +
> +/**
> + * ceu_try_fmt() - test format on CEU and sensor
> + *
> + * @v4l2_fmt: format to test
> + */
> +static int ceu_try_fmt(struct ceu_device *ceudev, struct v4l2_format *v4l2_fmt)
> +{
> + struct v4l2_pix_format_mplane *pix = &v4l2_fmt->fmt.pix_mp;
> + struct ceu_subdev *ceu_sd = ceudev->sd;
> + struct v4l2_subdev *v4l2_sd = ceu_sd->v4l2_sd;
> + struct v4l2_subdev_pad_config pad_cfg;
> + const struct ceu_fmt *ceu_fmt;
> + int ret;
> +
> + struct v4l2_subdev_format sd_format = {
> + .which = V4L2_SUBDEV_FORMAT_TRY,
> + };
> +
> + switch (pix->pixelformat) {
> + case V4L2_PIX_FMT_YUYV:
> + case V4L2_PIX_FMT_NV16:
> + case V4L2_PIX_FMT_NV61:
> + case V4L2_PIX_FMT_NV12:
> + case V4L2_PIX_FMT_NV21:
> + break;
> +
> + default:
> + v4l2_err(&ceudev->v4l2_dev,
> + "Pixel format 0x%x not supported, default to NV16\n",
> + pix->pixelformat);
> + pix->pixelformat = V4L2_PIX_FMT_NV16;
> + }
> +
> + ceu_fmt = get_ceu_fmt_from_fourcc(pix->pixelformat);
> +
> + /* CFSZR requires height and width to be 4-pixel aligned */
> + v4l_bound_align_image(&pix->width, 2, CEU_MAX_WIDTH, 2,
> + &pix->height, 4, CEU_MAX_HEIGHT, 2, 0);
> +
> + /*
> + * Set format on sensor sub device: bus format used to produce memory
> + * format is selected at initialization time
> + */
> + v4l2_fill_mbus_format_mplane(&sd_format.format, pix);
> + ret = v4l2_subdev_call(v4l2_sd, pad, set_fmt, &pad_cfg, &sd_format);
> + if (ret)
> + return ret;
> +
> + /* Scale down to sensor supported sizes */
> + if (sd_format.format.width != pix->width ||
> + sd_format.format.height != pix->height) {
> + v4l2_err(&ceudev->v4l2_dev,
> + "Unable to apply: 0x%x - %ux%u - scale to %ux%u\n",
> + pix->pixelformat, pix->width, pix->height,
> + sd_format.format.width, sd_format.format.height);
> + pix->width = sd_format.format.width;
> + pix->height = sd_format.format.height;
> + }
> +
> + /* Calculate per-plane sizes based on image format */
> + v4l2_fill_pix_format_mplane(pix, &sd_format.format);
> + pix->field = V4L2_FIELD_NONE;
> + ret = ceu_calc_plane_sizes(ceudev, ceu_fmt, pix);
> + if (ret < 0)
> + return ret;
> +
> + ret = ceu_test_mbus_param(ceudev);
> + if (ret < 0)
> + return ret;
> +
> + return 0;
> +}
> +
> +/**
> + * ceu_set_fmt() - Apply the supplied format to both sensor and CEU
> + */
> +static int ceu_set_fmt(struct ceu_device *ceudev, struct v4l2_format *v4l2_fmt)
> +{
> + struct ceu_subdev *ceu_sd = ceudev->sd;
> + struct v4l2_subdev *v4l2_sd = ceu_sd->v4l2_sd;
> + int ret;
> +
> + struct v4l2_subdev_format format = {
> + .which = V4L2_SUBDEV_FORMAT_ACTIVE,
> + };
> +
> + ret = ceu_try_fmt(ceudev, v4l2_fmt);
> + if (ret)
> + return ret;
> +
> + v4l2_fill_mbus_format_mplane(&format.format, &v4l2_fmt->fmt.pix_mp);
> + ret = v4l2_subdev_call(v4l2_sd, pad, set_fmt, NULL, &format);
> + if (ret)
> + return ret;
> +
> + ceudev->v4l2_pix = v4l2_fmt->fmt.pix_mp;
> +
> + ret = ceu_set_bus_params(ceudev);
> + if (ret)
> + return ret;
> +
> + return 0;
> +}
> +
> +/**
> + * ceu_set_default_fmt() - Apply default NV16 memory output format with VGA
> + * sizes.
> + */
> +static int ceu_set_default_fmt(struct ceu_device *ceudev)
> +{
> + int ret;
> + struct v4l2_format v4l2_fmt = {
> + .type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE,
> + .fmt.pix_mp = {
> + .width = VGA_WIDTH,
> + .height = VGA_HEIGHT,
> + .field = V4L2_FIELD_NONE,
> + .pixelformat = V4L2_PIX_FMT_NV16,
> + .plane_fmt = {
> + [0] = {
> + .sizeimage = VGA_WIDTH * VGA_HEIGHT * 2,
> + .bytesperline = VGA_WIDTH * 2,
> + },
> + [1] = {
> + .sizeimage = VGA_WIDTH * VGA_HEIGHT * 2,
> + .bytesperline = VGA_WIDTH * 2,
> + },
> + },
> + },
> + };
> +
> + ret = ceu_try_fmt(ceudev, &v4l2_fmt);
> + if (ret)
> + return ret;
> +
> + ceudev->v4l2_pix = v4l2_fmt.fmt.pix_mp;
> +
> + return 0;
> +}
> +
> +/**
> + * ceu_init_formats() - Query sensor for supported formats and initialize
> + * CEU supported format list
> + *
> + * Find out if sensor can produce a permutation of 8-bits YUYV bus format.
> + * From a single 8-bits YUYV bus format the CEU can produce several memory
> + * output formats:
> + * - NV[12|21|16|61] through image fetch mode;
> + * - YUYV422 if sensor provides YUYV422
> + *
> + * TODO: Other YUYV422 permutations throug data fetch sync mode and DTARY
> + * TODO: Binary data (eg. JPEG) and raw formats through data fetch sync mode
> + */
> +static int ceu_init_formats(struct ceu_device *ceudev)
> +{
> + struct ceu_subdev *ceu_sd = ceudev->sd;
> + struct ceu_mbus_fmt *mbus_fmt = &ceu_sd->mbus_fmt;
> + struct v4l2_subdev *v4l2_sd = ceu_sd->v4l2_sd;
> + bool yuyv_bus_fmt = false;
> +
> + struct v4l2_subdev_mbus_code_enum sd_mbus_fmt = {
> + .which = V4L2_SUBDEV_FORMAT_ACTIVE,
> + .index = 0,
> + };
> +
> + /* Find out if sensor can produce any permutation of 8-bits YUYV422 */
> + while (!yuyv_bus_fmt &&
> + !v4l2_subdev_call(v4l2_sd, pad, enum_mbus_code,
> + NULL, &sd_mbus_fmt)) {
> + switch (sd_mbus_fmt.code) {
> + case MEDIA_BUS_FMT_YUYV8_2X8:
> + case MEDIA_BUS_FMT_YVYU8_2X8:
> + case MEDIA_BUS_FMT_UYVY8_2X8:
> + case MEDIA_BUS_FMT_VYUY8_2X8:
> + yuyv_bus_fmt = true;
> + break;
> + default:
> + /*
> + * Only support 8-bits YUYV bus formats at the moment;
> + *
> + * TODO: add support for binary formats (data sync
> + * fetch mode).
> + */
> + break;
> + }
> +
> + sd_mbus_fmt.index++;
> + }
> +
> + if (!yuyv_bus_fmt)
> + return -ENXIO;
> +
> + /*
> + * Save the first encountered YUYV format as "mbus_fmt" and use it
> + * to output all planar YUV422 and YUV420 (NV*) formats to memory as
> + * well as for data synch fetch mode (YUYV - YVYU etc. ).
> + */
> + mbus_fmt->mbus_code = sd_mbus_fmt.code;
> + mbus_fmt->bps = 8;
> +
> + /* Annotate the selected bus format components ordering */
> + switch (sd_mbus_fmt.code) {
> + case MEDIA_BUS_FMT_YUYV8_2X8:
> + mbus_fmt->fmt_order = CEU_CAMCR_DTARY_8_YUYV;
> + mbus_fmt->fmt_order_swap = CEU_CAMCR_DTARY_8_YVYU;
> + mbus_fmt->swapped = false;
> + mbus_fmt->bpp = 16;
> + break;
> +
> + case MEDIA_BUS_FMT_YVYU8_2X8:
> + mbus_fmt->fmt_order = CEU_CAMCR_DTARY_8_YVYU;
> + mbus_fmt->fmt_order_swap = CEU_CAMCR_DTARY_8_YUYV;
> + mbus_fmt->swapped = true;
> + mbus_fmt->bpp = 16;
> + break;
> +
> + case MEDIA_BUS_FMT_UYVY8_2X8:
> + mbus_fmt->fmt_order = CEU_CAMCR_DTARY_8_UYVY;
> + mbus_fmt->fmt_order_swap = CEU_CAMCR_DTARY_8_VYUY;
> + mbus_fmt->swapped = false;
> + mbus_fmt->bpp = 16;
> + break;
> +
> + case MEDIA_BUS_FMT_VYUY8_2X8:
> + mbus_fmt->fmt_order = CEU_CAMCR_DTARY_8_VYUY;
> + mbus_fmt->fmt_order_swap = CEU_CAMCR_DTARY_8_UYVY;
> + mbus_fmt->swapped = true;
> + mbus_fmt->bpp = 16;
> + break;
> + }
> +
> + ceudev->field = V4L2_FIELD_NONE;
> +
> + return 0;
> +}
> +
> +/**
> + * ----------------------------------------------------------------------------
> + * Runtime PM Handlers
> + */
> +
> +/**
> + * ceu_runtime_suspend() - disable capture and interrupts and soft-reset.
> + * Turn sensor power off.
> + */
> +static int ceu_runtime_suspend(struct device *dev)
> +{
> + struct ceu_device *ceudev = dev_get_drvdata(dev);
> + struct v4l2_subdev *v4l2_sd = ceudev->sd->v4l2_sd;
> +
> + v4l2_subdev_call(v4l2_sd, core, s_power, 0);
> +
> + ceu_write(ceudev, CEU_CEIER, 0);
> + ceu_soft_reset(ceudev);
> +
> + return 0;
> +}
> +
> +/**
> + * ceu_runtime_resume() - soft-reset the interface and turn sensor power on.
> + */
> +static int ceu_runtime_resume(struct device *dev)
> +{
> + struct ceu_device *ceudev = dev_get_drvdata(dev);
> + struct v4l2_subdev *v4l2_sd = ceudev->sd->v4l2_sd;
> +
> + v4l2_subdev_call(v4l2_sd, core, s_power, 1);
> +
> + ceu_soft_reset(ceudev);
> +
> + return 0;
> +}
> +
> +/**
> + * ----------------------------------------------------------------------------
> + * File Operations
> + */
> +static int ceu_open(struct file *file)
> +{
> + struct ceu_device *ceudev = video_drvdata(file);
> + int ret;
> +
> + ret = v4l2_fh_open(file);
> + if (ret)
> + return ret;
> +
> + mutex_lock(&ceudev->mlock);
> + /* Causes soft-reset and sensor power on on first open */
> + pm_runtime_get_sync(ceudev->dev);
> + mutex_unlock(&ceudev->mlock);
> +
> + return 0;
> +}
> +
> +static int ceu_release(struct file *file)
> +{
> + struct ceu_device *ceudev = video_drvdata(file);
> +
> + vb2_fop_release(file);
> +
> + mutex_lock(&ceudev->mlock);
> + /* Causes soft-reset and sensor power down on last close */
> + pm_runtime_put(ceudev->dev);
> + mutex_unlock(&ceudev->mlock);
> +
> + return 0;
> +}
> +
> +static const struct v4l2_file_operations ceu_fops = {
> + .owner = THIS_MODULE,
> + .open = ceu_open,
> + .release = ceu_release,
> + .unlocked_ioctl = video_ioctl2,
> + .read = vb2_fop_read,
> + .mmap = vb2_fop_mmap,
> + .poll = vb2_fop_poll,
> +};
> +
> +/**
> + * ----------------------------------------------------------------------------
> + * Video Device IOCTLs
> + */
> +static int ceu_querycap(struct file *file, void *priv,
> + struct v4l2_capability *cap)
> +{
> + strlcpy(cap->card, "Renesas-CEU", sizeof(cap->card));
> + strlcpy(cap->driver, DRIVER_NAME, sizeof(cap->driver));
> + strlcpy(cap->bus_info, "platform:renesas-ceu", sizeof(cap->bus_info));
> +
> + return 0;
> +}
> +
> +static int ceu_enum_fmt_vid_cap(struct file *file, void *priv,
> + struct v4l2_fmtdesc *f)
> +{
> + const struct ceu_fmt *fmt;
> +
> + if (f->index >= ARRAY_SIZE(ceu_fmt_list) - 1)
> + return -EINVAL;
> +
> + fmt = &ceu_fmt_list[f->index];
> + f->pixelformat = fmt->fourcc;
> +
> + return 0;
> +}
> +
> +static int ceu_try_fmt_vid_cap(struct file *file, void *priv,
> + struct v4l2_format *f)
> +{
> + struct ceu_device *ceudev = video_drvdata(file);
> +
> + return ceu_try_fmt(ceudev, f);
> +}
> +
> +static int ceu_s_fmt_vid_cap(struct file *file, void *priv,
> + struct v4l2_format *f)
> +{
> + struct ceu_device *ceudev = video_drvdata(file);
> +
> + if (vb2_is_streaming(&ceudev->vb2_vq))
> + return -EBUSY;
> +
> + return ceu_set_fmt(ceudev, f);
> +}
> +
> +static int ceu_g_fmt_vid_cap(struct file *file, void *priv,
> + struct v4l2_format *f)
> +{
> + struct ceu_device *ceudev = video_drvdata(file);
> +
> + if (vb2_is_streaming(&ceudev->vb2_vq))
> + return -EBUSY;

Drop this. You can always return the current format. Only *setting* the format
requires this check.

> +
> + f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
> + f->fmt.pix_mp = ceudev->v4l2_pix;
> +
> + return 0;
> +}
> +
> +static int ceu_enum_input(struct file *file, void *priv,
> + struct v4l2_input *inp)
> +{
> + if (inp->index != 0)
> + return -EINVAL;
> +
> + inp->type = V4L2_INPUT_TYPE_CAMERA;
> + inp->std = 0;
> + strcpy(inp->name, "Camera");
> +
> + return 0;
> +}
> +
> +static int ceu_g_input(struct file *file, void *priv, unsigned int *i)
> +{
> + struct ceu_device *ceudev = video_drvdata(file);
> +
> + *i = ceudev->sd_index;
> +
> + return 0;
> +}
> +
> +static int ceu_s_input(struct file *file, void *priv, unsigned int i)
> +{
> + struct ceu_device *ceudev = video_drvdata(file);
> + struct ceu_subdev *ceu_sd_old;
> + int ret;
> +
> + if (i >= ceudev->num_sd)
> + return -EINVAL;
> +
> + ceu_sd_old = ceudev->sd;
> + ceudev->sd = &ceudev->subdevs[i];
> +
> + /* Make sure we can generate output image formats. */
> + ret = ceu_init_formats(ceudev);
> + if (ret) {
> + ceudev->sd = ceu_sd_old;
> + return -EINVAL;
> + }
> +
> + /* now that we're sure we can use the sensor, power off the old one */
> + v4l2_subdev_call(ceu_sd_old->v4l2_sd, core, s_power, 0);
> + v4l2_subdev_call(ceudev->sd->v4l2_sd, core, s_power, 1);
> +
> + ceudev->sd_index = i;
> +
> + return 0;
> +}
> +
> +static int ceu_g_parm(struct file *file, void *fh, struct v4l2_streamparm *a)
> +{
> + struct ceu_device *ceudev = video_drvdata(file);
> +
> + if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
> + return -EINVAL;
> +
> + return v4l2_subdev_call(ceudev->sd->v4l2_sd, video, g_parm, a);
> +}
> +
> +static int ceu_s_parm(struct file *file, void *fh, struct v4l2_streamparm *a)
> +{
> + struct ceu_device *ceudev = video_drvdata(file);
> +
> + if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
> + return -EINVAL;
> +
> + return v4l2_subdev_call(ceudev->sd->v4l2_sd, video, s_parm, a);
> +}
> +
> +static int ceu_enum_framesizes(struct file *file, void *fh,
> + struct v4l2_frmsizeenum *fsize)
> +{
> + struct ceu_device *ceudev = video_drvdata(file);
> + struct ceu_subdev *ceu_sd = ceudev->sd;
> + struct v4l2_subdev *v4l2_sd = ceu_sd->v4l2_sd;
> + int ret;
> +
> + struct v4l2_subdev_frame_size_enum fse = {
> + .code = ceu_sd->mbus_fmt.mbus_code,
> + .index = fsize->index,
> + .which = V4L2_SUBDEV_FORMAT_ACTIVE,
> + };
> +
> + ret = v4l2_subdev_call(v4l2_sd, pad, enum_frame_size,
> + NULL, &fse);
> + if (ret)
> + return ret;
> +
> + fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
> + fsize->discrete.width = CEU_W_MAX(fse.max_width);
> + fsize->discrete.height = CEU_H_MAX(fse.max_height);
> +
> + return 0;
> +}
> +
> +static int ceu_enum_frameintervals(struct file *file, void *fh,
> + struct v4l2_frmivalenum *fival)
> +{
> + struct ceu_device *ceudev = video_drvdata(file);
> + struct ceu_subdev *ceu_sd = ceudev->sd;
> + struct v4l2_subdev *v4l2_sd = ceu_sd->v4l2_sd;
> + int ret;
> +
> + struct v4l2_subdev_frame_interval_enum fie = {
> + .code = ceu_sd->mbus_fmt.mbus_code,
> + .index = fival->index,
> + .width = fival->width,
> + .height = fival->height,
> + .which = V4L2_SUBDEV_FORMAT_ACTIVE,
> + };
> +
> + ret = v4l2_subdev_call(v4l2_sd, pad, enum_frame_interval, NULL,
> + &fie);
> + if (ret)
> + return ret;
> +
> + fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
> + fival->discrete = fie.interval;
> +
> + return 0;
> +}
> +
> +static const struct v4l2_ioctl_ops ceu_ioctl_ops = {
> + .vidioc_querycap = ceu_querycap,
> +
> + .vidioc_enum_fmt_vid_cap_mplane = ceu_enum_fmt_vid_cap,
> + .vidioc_try_fmt_vid_cap_mplane = ceu_try_fmt_vid_cap,
> + .vidioc_s_fmt_vid_cap_mplane = ceu_s_fmt_vid_cap,
> + .vidioc_g_fmt_vid_cap_mplane = ceu_g_fmt_vid_cap,
> +
> + .vidioc_enum_input = ceu_enum_input,
> + .vidioc_g_input = ceu_g_input,
> + .vidioc_s_input = ceu_s_input,
> +
> + .vidioc_reqbufs = vb2_ioctl_reqbufs,
> + .vidioc_querybuf = vb2_ioctl_querybuf,
> + .vidioc_qbuf = vb2_ioctl_qbuf,
> + .vidioc_expbuf = vb2_ioctl_expbuf,
> + .vidioc_dqbuf = vb2_ioctl_dqbuf,
> + .vidioc_create_bufs = vb2_ioctl_create_bufs,
> + .vidioc_prepare_buf = vb2_ioctl_prepare_buf,
> + .vidioc_streamon = vb2_ioctl_streamon,
> + .vidioc_streamoff = vb2_ioctl_streamoff,
> +
> + .vidioc_g_parm = ceu_g_parm,
> + .vidioc_s_parm = ceu_s_parm,
> + .vidioc_enum_framesizes = ceu_enum_framesizes,
> + .vidioc_enum_frameintervals = ceu_enum_frameintervals,
> +};
> +
> +/**
> + * ceu_vdev_release() - release CEU video device memory when last reference
> + * to this driver is closed
> + */
> +void ceu_vdev_release(struct video_device *vdev)
> +{
> + struct ceu_device *ceudev = video_get_drvdata(vdev);
> +
> + kfree(ceudev);
> +}
> +
> +static int ceu_sensor_bound(struct v4l2_async_notifier *notifier,
> + struct v4l2_subdev *v4l2_sd,
> + struct v4l2_async_subdev *asd)
> +{
> + struct v4l2_device *v4l2_dev = notifier->v4l2_dev;
> + struct ceu_device *ceudev = v4l2_to_ceu(v4l2_dev);
> + struct ceu_subdev *ceu_sd = to_ceu_subdev(asd);
> +
> + if (video_is_registered(&ceudev->vdev)) {
> + v4l2_err(&ceudev->v4l2_dev,
> + "Video device registered before this sub-device.\n");
> + return -EBUSY;
> + }
> +
> + /* Assign subdevices in the order they appear */
> + ceu_sd->v4l2_sd = v4l2_sd;
> + ceudev->num_sd++;
> +
> + return 0;
> +}
> +
> +static int ceu_sensor_complete(struct v4l2_async_notifier *notifier)
> +{
> + struct v4l2_device *v4l2_dev = notifier->v4l2_dev;
> + struct ceu_device *ceudev = v4l2_to_ceu(v4l2_dev);
> + struct video_device *vdev = &ceudev->vdev;
> + struct vb2_queue *q = &ceudev->vb2_vq;
> + struct v4l2_subdev *v4l2_sd;
> + int ret;
> +
> + /* Initialize vb2 queue */
> + q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
> + q->io_modes = VB2_MMAP | VB2_USERPTR;

Please add VB2_DMABUF.

> + q->drv_priv = ceudev;
> + q->ops = &ceu_videobuf_ops;
> + q->mem_ops = &vb2_dma_contig_memops;
> + q->buf_struct_size = sizeof(struct ceu_buffer);
> + q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
> + q->lock = &ceudev->mlock;
> + q->dev = ceudev->v4l2_dev.dev;
> +
> + ret = vb2_queue_init(q);
> + if (ret)
> + return ret;
> +
> + /*
> + * Make sure at least one sensor is primary and use it to initialize
> + * ceu formats
> + */
> + if (!ceudev->sd) {
> + ceudev->sd = &ceudev->subdevs[0];
> + ceudev->sd_index = 0;
> + }
> +
> + v4l2_sd = ceudev->sd->v4l2_sd;
> +
> + ret = ceu_init_formats(ceudev);
> + if (ret)
> + return ret;
> +
> + ret = ceu_set_default_fmt(ceudev);
> + if (ret)
> + return ret;
> +
> + /* Register the video device */
> + strncpy(vdev->name, DRIVER_NAME, strlen(DRIVER_NAME));
> + vdev->v4l2_dev = v4l2_dev;
> + vdev->lock = &ceudev->mlock;
> + vdev->queue = &ceudev->vb2_vq;
> + vdev->ctrl_handler = v4l2_sd->ctrl_handler;
> + vdev->fops = &ceu_fops;
> + vdev->ioctl_ops = &ceu_ioctl_ops;
> + vdev->release = ceu_vdev_release;
> + vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE_MPLANE |

Why MPLANE? It doesn't appear to be needed since there are no multiplane
(really: multibuffer) pixelformats defined.

> + V4L2_CAP_STREAMING;
> + video_set_drvdata(vdev, ceudev);
> +
> + ret = video_register_device(vdev, VFL_TYPE_GRABBER, -1);
> + if (ret < 0) {
> + v4l2_err(vdev->v4l2_dev,
> + "video_register_device failed: %d\n", ret);
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +/**
> + * ceu_parse_init_sd() - Initialize CEU subdevices and async_subdevs in
> + * ceu device. Both DT and platform data parsing use
> + * this routine.
> + *
> + * @return 0 for success, -ENOMEM for failure.
> + */
> +static int ceu_parse_init_sd(struct ceu_device *ceudev, unsigned int n_sd)
> +{
> + /* Reserve memory for 'n_sd' ceu_subdev descriptors */
> + ceudev->subdevs = devm_kcalloc(ceudev->dev, n_sd,
> + sizeof(*ceudev->subdevs), GFP_KERNEL);
> + if (!ceudev->subdevs)
> + return -ENOMEM;
> +
> + /*
> + * Reserve memory for 'n_sd' pointers to async_subdevices.
> + * ceudev->asds members will point to &ceu_subdev.asd
> + */
> + ceudev->asds = devm_kcalloc(ceudev->dev, n_sd,
> + sizeof(*ceudev->asds), GFP_KERNEL);
> + if (!ceudev->asds)
> + return -ENOMEM;
> +
> + ceudev->sd = NULL;
> + ceudev->sd_index = 0;
> + ceudev->num_sd = 0;
> +
> + return 0;
> +}
> +
> +/**
> + * ceu_parse_platform_data() - Initialize async_subdevices using platform
> + * device provided data.
> + */
> +static int ceu_parse_platform_data(struct ceu_device *ceudev, void *pdata)
> +{
> + struct ceu_async_subdev *async_sd;
> + struct ceu_info *info = pdata;
> + struct ceu_subdev *ceu_sd;
> + unsigned int i;
> + int ret;
> +
> + ret = ceu_parse_init_sd(ceudev, info->num_subdevs);
> + if (ret)
> + return ret;
> +
> + for (i = 0; i < info->num_subdevs; i++) {
> + /* Setup the ceu subdevice and the async subdevice */
> + async_sd = &info->subdevs[i];
> + ceu_sd = &ceudev->subdevs[i];
> +
> + memset(&ceu_sd->asd, 0, sizeof(ceu_sd->asd));
> + INIT_LIST_HEAD(&ceu_sd->asd.list);
> +
> + ceu_sd->mbus_flags = async_sd->flags;
> + ceu_sd->asd.match_type = V4L2_ASYNC_MATCH_I2C;
> + ceu_sd->asd.match.i2c.adapter_id = async_sd->i2c_adapter_id;
> + ceu_sd->asd.match.i2c.address = async_sd->i2c_address;
> +
> + ceudev->asds[i] = &ceu_sd->asd;
> + }
> +
> + return info->num_subdevs;
> +}
> +
> +/**
> + * ceu_parse_dt() - Initialize async_subdevs parsing device tree graph
> + */
> +static int ceu_parse_dt(struct ceu_device *ceudev)
> +{
> + struct device_node *of = ceudev->dev->of_node;
> + struct v4l2_fwnode_endpoint fw_ep;
> + struct ceu_subdev *ceu_sd;
> + struct device_node *ep;
> + unsigned int i;
> + int num_ep;
> + int ret;
> +
> + num_ep = of_graph_get_endpoint_count(of);
> + if (num_ep <= 0)
> + return 0;
> +
> + ret = ceu_parse_init_sd(ceudev, num_ep);
> + if (ret)
> + return ret;
> +
> + for (i = 0; i < num_ep; i++) {
> + ep = of_graph_get_endpoint_by_regs(of, 0, i);
> + if (!ep) {
> + v4l2_err(&ceudev->v4l2_dev,
> + "No subdevice connected on port %u.\n", i);
> + ret = -ENODEV;
> + goto error_put_node;
> + }
> +
> + ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(ep), &fw_ep);
> + if (ret) {
> + v4l2_err(&ceudev->v4l2_dev,
> + "Unable to parse endpoint #%u.\n", i);
> + goto error_put_node;
> + }
> +
> + if (fw_ep.bus_type != V4L2_MBUS_PARALLEL) {
> + v4l2_err(&ceudev->v4l2_dev,
> + "Only parallel input supported.\n");
> + ret = -EINVAL;
> + goto error_put_node;
> + }
> +
> + /* Setup the ceu subdevice and the async subdevice */
> + ceu_sd = &ceudev->subdevs[i];
> + memset(&ceu_sd->asd, 0, sizeof(ceu_sd->asd));
> + INIT_LIST_HEAD(&ceu_sd->asd.list);
> +
> + ceu_sd->mbus_flags = fw_ep.bus.parallel.flags;
> + ceu_sd->asd.match_type = V4L2_ASYNC_MATCH_FWNODE;
> + ceu_sd->asd.match.fwnode.fwnode =
> + fwnode_graph_get_remote_port_parent(
> + of_fwnode_handle(ep));
> +
> + ceudev->asds[i] = &ceu_sd->asd;
> + of_node_put(ep);
> + }
> +
> + return num_ep;
> +
> +error_put_node:
> + of_node_put(ep);
> + return ret;
> +}
> +
> +static int ceu_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct ceu_device *ceudev;
> + struct resource *res;
> + void __iomem *base;
> + unsigned int irq;
> + int num_sd;
> + int ret;
> +
> + ceudev = kzalloc(sizeof(*ceudev), GFP_KERNEL);
> + if (!ceudev)
> + return -ENOMEM;
> +
> + platform_set_drvdata(pdev, ceudev);
> + dev_set_drvdata(dev, ceudev);
> + ceudev->dev = dev;
> +
> + INIT_LIST_HEAD(&ceudev->capture);
> + spin_lock_init(&ceudev->lock);
> + mutex_init(&ceudev->mlock);
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (IS_ERR(res))
> + return PTR_ERR(res);
> +
> + base = devm_ioremap_resource(dev, res);
> + if (IS_ERR(base))
> + return PTR_ERR(base);
> + ceudev->base = base;
> +
> + ret = platform_get_irq(pdev, 0);
> + if (ret < 0) {
> + dev_err(dev, "failed to get irq: %d\n", ret);
> + return ret;
> + }
> + irq = ret;
> +
> + ret = devm_request_irq(dev, irq, ceu_irq,
> + 0, dev_name(dev), ceudev);
> + if (ret) {
> + dev_err(&pdev->dev, "Unable to register CEU interrupt.\n");
> + return ret;
> + }
> +
> + pm_suspend_ignore_children(dev, true);
> + pm_runtime_enable(dev);
> +
> + ret = v4l2_device_register(dev, &ceudev->v4l2_dev);
> + if (ret)
> + goto error_pm_disable;
> +
> + if (IS_ENABLED(CONFIG_OF) && dev->of_node) {
> + num_sd = ceu_parse_dt(ceudev);
> + } else if (dev->platform_data) {
> + num_sd = ceu_parse_platform_data(ceudev, dev->platform_data);
> + } else {
> + dev_err(dev, "CEU platform data not set and no OF support\n");
> + ret = -EINVAL;
> + goto error_v4l2_unregister;
> + }
> +
> + if (num_sd < 0) {
> + ret = num_sd;
> + goto error_v4l2_unregister;
> + } else if (num_sd == 0)
> + return 0;
> +
> + ceudev->notifier.v4l2_dev = &ceudev->v4l2_dev;
> + ceudev->notifier.subdevs = ceudev->asds;
> + ceudev->notifier.num_subdevs = num_sd;
> + ceudev->notifier.bound = ceu_sensor_bound;
> + ceudev->notifier.complete = ceu_sensor_complete;
> + ret = v4l2_async_notifier_register(&ceudev->v4l2_dev,
> + &ceudev->notifier);
> + if (ret)
> + goto error_v4l2_unregister_notifier;
> +
> + dev_info(dev, "Renesas Capture Engine Unit\n");
> +
> + return 0;
> +
> +error_v4l2_unregister_notifier:
> + v4l2_async_notifier_unregister(&ceudev->notifier);
> +error_v4l2_unregister:
> + v4l2_device_unregister(&ceudev->v4l2_dev);
> +error_pm_disable:
> + pm_runtime_disable(dev);
> +
> + return ret;
> +}
> +
> +static int ceu_remove(struct platform_device *pdev)
> +{
> + struct ceu_device *ceudev = platform_get_drvdata(pdev);
> +
> + pm_runtime_disable(ceudev->dev);
> +
> + v4l2_async_notifier_unregister(&ceudev->notifier);
> +
> + v4l2_device_unregister(&ceudev->v4l2_dev);
> +
> + video_unregister_device(&ceudev->vdev);
> +
> + return 0;
> +}
> +
> +#if IS_ENABLED(CONFIG_OF)
> +static const struct of_device_id ceu_of_match[] = {
> + { .compatible = "renesas,renesas-ceu" },
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, ceu_of_match);
> +#endif
> +
> +static const struct dev_pm_ops ceu_pm_ops = {
> + SET_RUNTIME_PM_OPS(ceu_runtime_suspend,
> + ceu_runtime_resume,
> + NULL)
> +};
> +
> +static struct platform_driver ceu_driver = {
> + .driver = {
> + .name = DRIVER_NAME,
> + .pm = &ceu_pm_ops,
> + .of_match_table = of_match_ptr(ceu_of_match),
> + },
> + .probe = ceu_probe,
> + .remove = ceu_remove,
> +};
> +
> +module_platform_driver(ceu_driver);
> +
> +MODULE_DESCRIPTION("Renesas CEU camera driver");
> +MODULE_AUTHOR("Jacopo Mondi <jacopo+renesas@jmondi.org>");
> +MODULE_LICENSE("GPL");
> --
> 2.7.4
>

Regards,

Hans

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