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Subject[PATCH 2/3] drm: Add an hx8367d tinydrm driver.
Date
I want to sort out support for tinydrm in vc4, so I needed to get a
tinydrm-appropriate panel working and this is what I had on hand.
This is derived from a combination of ili9341.c from tinydrm and
fb_hx8357d.c from staging's fbtft. The register header is copied
directly from staging's fbtft, on the assumption that we will delete
that copy later.

Signed-off-by: Eric Anholt <eric@anholt.net>
---
MAINTAINERS | 7 +
drivers/gpu/drm/tinydrm/Kconfig | 11 ++
drivers/gpu/drm/tinydrm/Makefile | 1 +
drivers/gpu/drm/tinydrm/hx8357d.c | 261 ++++++++++++++++++++++++++++++
drivers/gpu/drm/tinydrm/hx8357d.h | 71 ++++++++
5 files changed, 351 insertions(+)
create mode 100644 drivers/gpu/drm/tinydrm/hx8357d.c
create mode 100644 drivers/gpu/drm/tinydrm/hx8357d.h

diff --git a/MAINTAINERS b/MAINTAINERS
index 39c3f6682ace..e78971e20a11 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4623,6 +4623,13 @@ S: Maintained
F: drivers/gpu/drm/tinydrm/ili9225.c
F: Documentation/devicetree/bindings/display/ilitek,ili9225.txt

+DRM DRIVER FOR HX8357D PANELS
+M: Eric Anholt <eric@anholt.net>
+T: git git://anongit.freedesktop.org/drm/drm-misc
+S: Maintained
+F: drivers/gpu/drm/tinydrm/hx8357d.c
+F: Documentation/devicetree/bindings/display/himax,hx8357d.txt
+
DRM DRIVER FOR INTEL I810 VIDEO CARDS
S: Orphan / Obsolete
F: drivers/gpu/drm/i810/
diff --git a/drivers/gpu/drm/tinydrm/Kconfig b/drivers/gpu/drm/tinydrm/Kconfig
index 16f4b5c91f1b..2c408ac1a900 100644
--- a/drivers/gpu/drm/tinydrm/Kconfig
+++ b/drivers/gpu/drm/tinydrm/Kconfig
@@ -10,6 +10,17 @@ menuconfig DRM_TINYDRM
config TINYDRM_MIPI_DBI
tristate

+config TINYDRM_HX8357D
+ tristate "DRM support for HX8357D display panels"
+ depends on DRM_TINYDRM && SPI
+ depends on BACKLIGHT_CLASS_DEVICE
+ select TINYDRM_MIPI_DBI
+ help
+ DRM driver for the following HX8357D panels:
+ * YX350HV15-T 3.5" 340x350 TFT (Adafruit 3.5")
+
+ If M is selected the module will be called hx8357d.
+
config TINYDRM_ILI9225
tristate "DRM support for ILI9225 display panels"
depends on DRM_TINYDRM && SPI
diff --git a/drivers/gpu/drm/tinydrm/Makefile b/drivers/gpu/drm/tinydrm/Makefile
index 14d99080665a..f823066f7743 100644
--- a/drivers/gpu/drm/tinydrm/Makefile
+++ b/drivers/gpu/drm/tinydrm/Makefile
@@ -4,6 +4,7 @@ obj-$(CONFIG_DRM_TINYDRM) += core/
obj-$(CONFIG_TINYDRM_MIPI_DBI) += mipi-dbi.o

# Displays
+obj-$(CONFIG_TINYDRM_HX8357D) += hx8357d.o
obj-$(CONFIG_TINYDRM_ILI9225) += ili9225.o
obj-$(CONFIG_TINYDRM_ILI9341) += ili9341.o
obj-$(CONFIG_TINYDRM_MI0283QT) += mi0283qt.o
diff --git a/drivers/gpu/drm/tinydrm/hx8357d.c b/drivers/gpu/drm/tinydrm/hx8357d.c
new file mode 100644
index 000000000000..51d4da624d57
--- /dev/null
+++ b/drivers/gpu/drm/tinydrm/hx8357d.c
@@ -0,0 +1,261 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * DRM driver for the HX8357D LCD controller
+ *
+ * Copyright 2018 Broadcom
+ * Copyright 2018 David Lechner <david@lechnology.com>
+ * Copyright 2016 Noralf Trønnes
+ * Copyright (C) 2015 Adafruit Industries
+ * Copyright (C) 2013 Christian Vogelgsang
+ */
+
+#include <linux/backlight.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/property.h>
+#include <linux/spi/spi.h>
+
+#include <drm/drm_fb_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_modeset_helper.h>
+#include <drm/tinydrm/mipi-dbi.h>
+#include <drm/tinydrm/tinydrm-helpers.h>
+#include <video/mipi_display.h>
+#include "hx8357d.h"
+
+#define HX8357D_MADCTL_MY 0x80
+#define HX8357D_MADCTL_MX 0x40
+#define HX8357D_MADCTL_MV 0x20
+#define HX8357D_MADCTL_ML 0x10
+#define HX8357D_MADCTL_RGB 0x00
+#define HX8357D_MADCTL_BGR 0x08
+#define HX8357D_MADCTL_MH 0x04
+
+static void yx240qv29_enable(struct drm_simple_display_pipe *pipe,
+ struct drm_crtc_state *crtc_state,
+ struct drm_plane_state *plane_state)
+{
+ struct tinydrm_device *tdev = pipe_to_tinydrm(pipe);
+ struct mipi_dbi *mipi = mipi_dbi_from_tinydrm(tdev);
+ u8 addr_mode;
+ int ret;
+
+ DRM_DEBUG_KMS("\n");
+
+ ret = mipi_dbi_poweron_conditional_reset(mipi);
+ if (ret < 0)
+ return;
+ if (ret == 1)
+ goto out_enable;
+
+ /* setextc */
+ mipi_dbi_command(mipi, HX8357D_SETC, 0xFF, 0x83, 0x57);
+ msleep(150);
+
+ /* setRGB which also enables SDO */
+ mipi_dbi_command(mipi, HX8357_SETRGB, 0x00, 0x00, 0x06, 0x06);
+
+ /* -1.52V */
+ mipi_dbi_command(mipi, HX8357D_SETCOM, 0x25);
+
+ /* Normal mode 70Hz, Idle mode 55 Hz */
+ mipi_dbi_command(mipi, HX8357_SETOSC, 0x68);
+
+ /* Set Panel - BGR, Gate direction swapped */
+ mipi_dbi_command(mipi, HX8357_SETPANEL, 0x05);
+
+ mipi_dbi_command(mipi, HX8357_SETPWR1,
+ 0x00, /* Not deep standby */
+ 0x15, /* BT */
+ 0x1C, /* VSPR */
+ 0x1C, /* VSNR */
+ 0x83, /* AP */
+ 0xAA); /* FS */
+
+ mipi_dbi_command(mipi, HX8357D_SETSTBA,
+ 0x50, /* OPON normal */
+ 0x50, /* OPON idle */
+ 0x01, /* STBA */
+ 0x3C, /* STBA */
+ 0x1E, /* STBA */
+ 0x08); /* GEN */
+
+ mipi_dbi_command(mipi, HX8357D_SETCYC,
+ 0x02, /* NW 0x02 */
+ 0x40, /* RTN */
+ 0x00, /* DIV */
+ 0x2A, /* DUM */
+ 0x2A, /* DUM */
+ 0x0D, /* GDON */
+ 0x78); /* GDOFF */
+
+ mipi_dbi_command(mipi, HX8357D_SETGAMMA,
+ 0x02,
+ 0x0A,
+ 0x11,
+ 0x1d,
+ 0x23,
+ 0x35,
+ 0x41,
+ 0x4b,
+ 0x4b,
+ 0x42,
+ 0x3A,
+ 0x27,
+ 0x1B,
+ 0x08,
+ 0x09,
+ 0x03,
+ 0x02,
+ 0x0A,
+ 0x11,
+ 0x1d,
+ 0x23,
+ 0x35,
+ 0x41,
+ 0x4b,
+ 0x4b,
+ 0x42,
+ 0x3A,
+ 0x27,
+ 0x1B,
+ 0x08,
+ 0x09,
+ 0x03,
+ 0x00,
+ 0x01);
+
+ /* 16 bit */
+ mipi_dbi_command(mipi, MIPI_DCS_SET_PIXEL_FORMAT,
+ MIPI_DCS_PIXEL_FMT_16BIT);
+
+ /* TE off */
+ mipi_dbi_command(mipi, MIPI_DCS_SET_TEAR_ON, 0x00);
+
+ /* tear line */
+ mipi_dbi_command(mipi, MIPI_DCS_SET_TEAR_SCANLINE, 0x00, 0x02);
+
+ /* Exit Sleep */
+ mipi_dbi_command(mipi, MIPI_DCS_EXIT_SLEEP_MODE);
+ msleep(150);
+
+ /* display on */
+ mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_ON);
+ usleep_range(5000, 7000);
+
+out_enable:
+ switch (mipi->rotation) {
+ default:
+ addr_mode = HX8357D_MADCTL_MX | HX8357D_MADCTL_MY;
+ break;
+ case 90:
+ addr_mode = HX8357D_MADCTL_MV | HX8357D_MADCTL_MY;
+ break;
+ case 180:
+ addr_mode = 0;
+ break;
+ case 270:
+ addr_mode = HX8357D_MADCTL_MV | HX8357D_MADCTL_MX;
+ break;
+ }
+ mipi_dbi_command(mipi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
+ mipi_dbi_enable_flush(mipi, crtc_state, plane_state);
+}
+
+static const struct drm_simple_display_pipe_funcs hx8357d_pipe_funcs = {
+ .enable = yx240qv29_enable,
+ .disable = mipi_dbi_pipe_disable,
+ .update = tinydrm_display_pipe_update,
+ .prepare_fb = drm_gem_fb_simple_display_pipe_prepare_fb,
+};
+
+static const struct drm_display_mode yx350hv15_mode = {
+ TINYDRM_MODE(320, 480, 60, 75),
+};
+
+DEFINE_DRM_GEM_CMA_FOPS(hx8357d_fops);
+
+static struct drm_driver hx8357d_driver = {
+ .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME | DRIVER_ATOMIC,
+ .fops = &hx8357d_fops,
+ TINYDRM_GEM_DRIVER_OPS,
+ .debugfs_init = mipi_dbi_debugfs_init,
+ .name = "hx8357d",
+ .desc = "HX8357D",
+ .date = "20181023",
+ .major = 1,
+ .minor = 0,
+};
+
+static const struct of_device_id hx8357d_of_match[] = {
+ { .compatible = "adafruit,yx350hv15" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, hx8357d_of_match);
+
+static const struct spi_device_id hx8357d_id[] = {
+ { "hx8357d", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(spi, hx8357d_id);
+
+static int hx8357d_probe(struct spi_device *spi)
+{
+ struct device *dev = &spi->dev;
+ struct mipi_dbi *mipi;
+ struct gpio_desc *dc;
+ u32 rotation = 0;
+ int ret;
+
+ mipi = devm_kzalloc(dev, sizeof(*mipi), GFP_KERNEL);
+ if (!mipi)
+ return -ENOMEM;
+
+ dc = devm_gpiod_get(dev, "dc", GPIOD_OUT_LOW);
+ if (IS_ERR(dc)) {
+ DRM_DEV_ERROR(dev, "Failed to get gpio 'dc'\n");
+ return PTR_ERR(dc);
+ }
+
+ mipi->backlight = devm_of_find_backlight(dev);
+ if (IS_ERR(mipi->backlight))
+ return PTR_ERR(mipi->backlight);
+
+ device_property_read_u32(dev, "rotation", &rotation);
+
+ ret = mipi_dbi_spi_init(spi, mipi, dc);
+ if (ret)
+ return ret;
+
+ ret = mipi_dbi_init(&spi->dev, mipi, &hx8357d_pipe_funcs,
+ &hx8357d_driver, &yx350hv15_mode, rotation);
+ if (ret)
+ return ret;
+
+ spi_set_drvdata(spi, mipi);
+
+ return devm_tinydrm_register(&mipi->tinydrm);
+}
+
+static void hx8357d_shutdown(struct spi_device *spi)
+{
+ struct mipi_dbi *mipi = spi_get_drvdata(spi);
+
+ tinydrm_shutdown(&mipi->tinydrm);
+}
+
+static struct spi_driver hx8357d_spi_driver = {
+ .driver = {
+ .name = "hx8357d",
+ .of_match_table = hx8357d_of_match,
+ },
+ .id_table = hx8357d_id,
+ .probe = hx8357d_probe,
+ .shutdown = hx8357d_shutdown,
+};
+module_spi_driver(hx8357d_spi_driver);
+
+MODULE_DESCRIPTION("HX8357D DRM driver");
+MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/gpu/drm/tinydrm/hx8357d.h b/drivers/gpu/drm/tinydrm/hx8357d.h
new file mode 100644
index 000000000000..6180b093f94f
--- /dev/null
+++ b/drivers/gpu/drm/tinydrm/hx8357d.h
@@ -0,0 +1,71 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * This is our library for the Adafruit ILI9341 Breakout and Shield
+ * ----> http://www.adafruit.com/products/1651
+ *
+ * Check out the links above for our tutorials and wiring diagrams
+ * These displays use SPI to communicate, 4 or 5 pins are required to
+ * interface (RST is optional)
+ * Adafruit invests time and resources providing this open source code,
+ * please support Adafruit and open-source hardware by purchasing
+ * products from Adafruit!
+ *
+ * Written by Limor Fried/Ladyada for Adafruit Industries.
+ * MIT license, all text above must be included in any redistribution
+ */
+
+#ifndef __HX8357_H__
+#define __HX8357_H__
+
+#define HX8357D 0xD
+#define HX8357B 0xB
+
+#define HX8357_TFTWIDTH 320
+#define HX8357_TFTHEIGHT 480
+
+#define HX8357_SETOSC 0xB0
+#define HX8357_SETPWR1 0xB1
+#define HX8357B_SETDISPLAY 0xB2
+#define HX8357_SETRGB 0xB3
+#define HX8357D_SETCOM 0xB6
+
+#define HX8357B_SETDISPMODE 0xB4
+#define HX8357D_SETCYC 0xB4
+#define HX8357B_SETOTP 0xB7
+#define HX8357D_SETC 0xB9
+
+#define HX8357B_SET_PANEL_DRIVING 0xC0
+#define HX8357D_SETSTBA 0xC0
+#define HX8357B_SETDGC 0xC1
+#define HX8357B_SETID 0xC3
+#define HX8357B_SETDDB 0xC4
+#define HX8357B_SETDISPLAYFRAME 0xC5
+#define HX8357B_GAMMASET 0xC8
+#define HX8357B_SETCABC 0xC9
+#define HX8357_SETPANEL 0xCC
+
+#define HX8357B_SETPOWER 0xD0
+#define HX8357B_SETVCOM 0xD1
+#define HX8357B_SETPWRNORMAL 0xD2
+
+#define HX8357B_RDID1 0xDA
+#define HX8357B_RDID2 0xDB
+#define HX8357B_RDID3 0xDC
+#define HX8357B_RDID4 0xDD
+
+#define HX8357D_SETGAMMA 0xE0
+
+#define HX8357B_SETGAMMA 0xC8
+#define HX8357B_SETPANELRELATED 0xE9
+
+/* Color definitions */
+#define HX8357_BLACK 0x0000
+#define HX8357_BLUE 0x001F
+#define HX8357_RED 0xF800
+#define HX8357_GREEN 0x07E0
+#define HX8357_CYAN 0x07FF
+#define HX8357_MAGENTA 0xF81F
+#define HX8357_YELLOW 0xFFE0
+#define HX8357_WHITE 0xFFFF
+
+#endif /* __HX8357_H__ */
--
2.19.1
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