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    Subject[PATCH v2 6/9] drm/komeda: Add komeda_framebuffer
    Date
    komeda_framebuffer is for extending drm_framebuffer to add komeda own
    attributes and komeda specific fb handling.

    Signed-off-by: James (Qian) Wang <james.qian.wang@arm.com>
    ---
    drivers/gpu/drm/arm/display/komeda/Makefile | 3 +-
    .../arm/display/komeda/komeda_framebuffer.c | 165 ++++++++++++++++++
    .../arm/display/komeda/komeda_framebuffer.h | 31 ++++
    3 files changed, 198 insertions(+), 1 deletion(-)
    create mode 100644 drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c
    create mode 100644 drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.h

    diff --git a/drivers/gpu/drm/arm/display/komeda/Makefile b/drivers/gpu/drm/arm/display/komeda/Makefile
    index c86602131dbc..d369317f72ab 100644
    --- a/drivers/gpu/drm/arm/display/komeda/Makefile
    +++ b/drivers/gpu/drm/arm/display/komeda/Makefile
    @@ -8,7 +8,8 @@ komeda-y := \
    komeda_drv.o \
    komeda_dev.o \
    komeda_format_caps.o \
    - komeda_pipeline.o
    + komeda_pipeline.o \
    + komeda_framebuffer.o

    komeda-y += \
    d71/d71_dev.o
    diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c b/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c
    new file mode 100644
    index 000000000000..9912d6cc4c4f
    --- /dev/null
    +++ b/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c
    @@ -0,0 +1,165 @@
    +// SPDX-License-Identifier: GPL-2.0
    +/*
    + * (C) COPYRIGHT 2018 ARM Limited. All rights reserved.
    + * Author: James.Qian.Wang <james.qian.wang@arm.com>
    + *
    + */
    +#include <drm/drm_gem.h>
    +#include <drm/drm_gem_framebuffer_helper.h>
    +#include <drm/drm_fb_cma_helper.h>
    +#include <drm/drm_gem_cma_helper.h>
    +#include "komeda_framebuffer.h"
    +#include "komeda_dev.h"
    +
    +static void komeda_fb_destroy(struct drm_framebuffer *fb)
    +{
    + struct komeda_fb *kfb = to_kfb(fb);
    + u32 i;
    +
    + for (i = 0; i < fb->format->num_planes; i++)
    + drm_gem_object_put_unlocked(fb->obj[i]);
    +
    + drm_framebuffer_cleanup(fb);
    + kfree(kfb);
    +}
    +
    +static int komeda_fb_create_handle(struct drm_framebuffer *fb,
    + struct drm_file *file, u32 *handle)
    +{
    + return drm_gem_handle_create(file, fb->obj[0], handle);
    +}
    +
    +static const struct drm_framebuffer_funcs komeda_fb_funcs = {
    + .destroy = komeda_fb_destroy,
    + .create_handle = komeda_fb_create_handle,
    +};
    +
    +static int
    +komeda_fb_none_afbc_size_check(struct komeda_dev *mdev, struct komeda_fb *kfb,
    + struct drm_file *file,
    + const struct drm_mode_fb_cmd2 *mode_cmd)
    +{
    + struct drm_framebuffer *fb = &kfb->base;
    + struct drm_gem_object *obj;
    + u32 min_size = 0;
    + u32 i;
    +
    + for (i = 0; i < fb->format->num_planes; i++) {
    + obj = drm_gem_object_lookup(file, mode_cmd->handles[i]);
    + if (!obj) {
    + DRM_DEBUG_KMS("Failed to lookup GEM object\n");
    + fb->obj[i] = NULL;
    +
    + return -ENOENT;
    + }
    +
    + kfb->aligned_w = fb->width / (i ? fb->format->hsub : 1);
    + kfb->aligned_h = fb->height / (i ? fb->format->vsub : 1);
    +
    + if (fb->pitches[i] % mdev->chip.bus_width) {
    + DRM_DEBUG_KMS("Pitch[%d]: 0x%x doesn't aligned 0x%x\n",
    + i, fb->pitches[i], mdev->chip.bus_width);
    + drm_gem_object_put_unlocked(obj);
    + fb->obj[i] = NULL;
    +
    + return -EINVAL;
    + }
    +
    + min_size = ((kfb->aligned_h / kfb->format_caps->tile_size - 1)
    + * fb->pitches[i])
    + + (kfb->aligned_w * fb->format->cpp[i]
    + * kfb->format_caps->tile_size)
    + + fb->offsets[i];
    +
    + if (obj->size < min_size) {
    + DRM_DEBUG_KMS("Fail to check none afbc fb size.\n");
    + drm_gem_object_put_unlocked(obj);
    + fb->obj[i] = NULL;
    +
    + return -EINVAL;
    + }
    +
    + fb->obj[i] = obj;
    + }
    +
    + if (fb->format->num_planes == 3) {
    + if (fb->pitches[1] != fb->pitches[2]) {
    + DRM_DEBUG_KMS("The pitch[1] and [2] are not same\n");
    + return -EINVAL;
    + }
    + }
    +
    + return 0;
    +}
    +
    +struct drm_framebuffer *
    +komeda_fb_create(struct drm_device *dev, struct drm_file *file,
    + const struct drm_mode_fb_cmd2 *mode_cmd)
    +{
    + struct komeda_dev *mdev = dev->dev_private;
    + struct komeda_fb *kfb;
    + int ret = 0, i;
    +
    + kfb = kzalloc(sizeof(*kfb), GFP_KERNEL);
    + if (!kfb)
    + return ERR_PTR(-ENOMEM);
    +
    + kfb->format_caps = komeda_get_format_caps(&mdev->fmt_tbl,
    + mode_cmd->pixel_format,
    + mode_cmd->modifier[0]);
    + if (kfb->format_caps == NULL) {
    + DRM_DEBUG_KMS("FMT %x is not supported.\n",
    + mode_cmd->pixel_format);
    + kfree(kfb);
    + return ERR_PTR(-EINVAL);
    + }
    +
    + drm_helper_mode_fill_fb_struct(dev, &kfb->base, mode_cmd);
    +
    + ret = komeda_fb_none_afbc_size_check(mdev, kfb, file, mode_cmd);
    + if (ret < 0)
    + goto err_cleanup;
    +
    + ret = drm_framebuffer_init(dev, &kfb->base, &komeda_fb_funcs);
    + if (ret < 0) {
    + DRM_DEBUG_KMS("failed to initialize fb\n");
    +
    + goto err_cleanup;
    + }
    +
    + return &kfb->base;
    +
    +err_cleanup:
    + for(i = 0; i < kfb->base.format->num_planes; i++)
    + drm_gem_object_put_unlocked(kfb->base.obj[i]);
    +
    + kfree(kfb);
    + return ERR_PTR(ret);
    +}
    +
    +dma_addr_t
    +komeda_fb_get_pixel_addr(struct komeda_fb *kfb, int x, int y, int plane)
    +{
    + struct drm_framebuffer *fb = &kfb->base;
    + const struct drm_gem_cma_object *obj;
    + u32 plane_x, plane_y, cpp, pitch, offset;
    +
    + if (plane > fb->format->num_planes) {
    + DRM_DEBUG_KMS("Out of max plane num.\n");
    + return -EINVAL;
    + }
    +
    + obj = drm_fb_cma_get_gem_obj(fb, plane);
    +
    + offset = fb->offsets[plane];
    + if (!fb->modifier) {
    + plane_x = x / (plane ? fb->format->hsub : 1);
    + plane_y = y / (plane ? fb->format->vsub : 1);
    + cpp = fb->format->cpp[plane];
    + pitch = fb->pitches[plane];
    + offset += plane_x * cpp * kfb->format_caps->tile_size +
    + (plane_y * pitch) / kfb->format_caps->tile_size;
    + }
    +
    + return obj->paddr + offset;
    +}
    diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.h b/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.h
    new file mode 100644
    index 000000000000..383780013bb9
    --- /dev/null
    +++ b/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.h
    @@ -0,0 +1,31 @@
    +/* SPDX-License-Identifier: GPL-2.0 */
    +/*
    + * (C) COPYRIGHT 2018 ARM Limited. All rights reserved.
    + * Author: James.Qian.Wang <james.qian.wang@arm.com>
    + *
    + */
    +#ifndef _KOMEDA_FRAMEBUFFER_H_
    +#define _KOMEDA_FRAMEBUFFER_H_
    +
    +/** struct komeda_fb - entend drm_framebuffer with komeda attribute */
    +struct komeda_fb {
    + /** @base: &drm_framebuffer */
    + struct drm_framebuffer base;
    + /* @format_caps: &komeda_format_caps */
    + const struct komeda_format_caps *format_caps;
    + /** @aligned_w: aligned frame buffer width */
    + u32 aligned_w;
    + /** @aligned_h: aligned frame buffer height */
    + u32 aligned_h;
    +};
    +
    +#define to_kfb(dfb) container_of(dfb, struct komeda_fb, base)
    +
    +struct drm_framebuffer *
    +komeda_fb_create(struct drm_device *dev, struct drm_file *file,
    + const struct drm_mode_fb_cmd2 *mode_cmd);
    +dma_addr_t
    +komeda_fb_get_pixel_addr(struct komeda_fb *kfb, int x, int y, int plane);
    +bool komeda_fb_is_layer_supported(struct komeda_fb *kfb, u32 layer_type);
    +
    +#endif
    --
    2.17.1
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