Re: [PATCH v4 3/3] drm/tinydrm: add support for tft displays based on ilitek,ili9486

Hi Kamlesh

On Mon, Jan 27, 2020 at 07:56:46PM +0530, Kamlesh Gurudasani wrote:

This adds support fot ilitek,ili9486 based displays with shift register in front of controller. Ozzmaker,Piscreen and Waveshare,rpi-lcd-35 are such displays.

Signed-off-by: Kamlesh Gurudasani kamlesh.gurudasani@gmail.com

Driver looks good.

Can you please replace tinydrm with tiny in the subject. We no longer have a tinydrm folder.

With this fixed: Acked-by: Sam Ravnborg sam@ravnborg.org

---

v2 changes:

• assignment of dbi_command before registration
• made dc and reset gpio compulsory
• typos and unwanted comments removed
• changed the name of function which were display specific
• arranged the Makefile entries in alphabetical order

v3 changes:

• no changes

v4 changes:

• no changes

---

MAINTAINERS | 7 + drivers/gpu/drm/tiny/Kconfig | 14 ++ drivers/gpu/drm/tiny/Makefile | 1 + drivers/gpu/drm/tiny/ili9486.c | 283 +++++++++++++++++++++++++++++++++++++++++ 4 files changed, 305 insertions(+) create mode 100644 drivers/gpu/drm/tiny/ili9486.c

diff --git a/MAINTAINERS b/MAINTAINERS index 16423f5..30dd396 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -5233,6 +5233,13 @@ S: Maintained F: drivers/gpu/drm/tiny/ili9225.c F: Documentation/devicetree/bindings/display/ilitek,ili9225.txt

+DRM DRIVER FOR ILITEK ILI9486 PANELS +M: Kamlesh Gurudasani kamlesh.gurudasani@gmail.com +T: git git://anongit.freedesktop.org/drm/drm-misc +S: Maintained +F: drivers/gpu/drm/tiny/ili9486.c +F: Documentation/devicetree/bindings/display/ilitek,ili9486.yaml

DRM DRIVER FOR HX8357D PANELS M: Eric Anholt eric@anholt.net T: git git://anongit.freedesktop.org/drm/drm-misc diff --git a/drivers/gpu/drm/tiny/Kconfig b/drivers/gpu/drm/tiny/Kconfig index a866421..4160e74 100644 --- a/drivers/gpu/drm/tiny/Kconfig +++ b/drivers/gpu/drm/tiny/Kconfig @@ -47,6 +47,20 @@ config TINYDRM_ILI9341

 If M is selected the module will be called ili9341.

+config TINYDRM_ILI9486

• tristate "DRM support for ILI9486 display panels"
• depends on DRM && SPI
• select DRM_KMS_HELPER
• select DRM_KMS_CMA_HELPER
• select DRM_MIPI_DBI
• select BACKLIGHT_CLASS_DEVICE
• help

•  DRM driver for the following Ilitek ILI9486 panels:
  

•  * PISCREEN 3.5" 320x480 TFT (Ozzmaker 3.5")
  

•  * RPILCD 3.5" 320x480 TFT (Waveshare 3.5")
  

•  If M is selected the module will be called ili9486.
  

config TINYDRM_MI0283QT tristate "DRM support for MI0283QT" depends on DRM && SPI diff --git a/drivers/gpu/drm/tiny/Makefile b/drivers/gpu/drm/tiny/Makefile index 896cf31..c96ceee 100644 --- a/drivers/gpu/drm/tiny/Makefile +++ b/drivers/gpu/drm/tiny/Makefile @@ -4,6 +4,7 @@ obj-$(CONFIG_DRM_GM12U320) += gm12u320.o obj-$(CONFIG_TINYDRM_HX8357D) += hx8357d.o obj-$(CONFIG_TINYDRM_ILI9225) += ili9225.o obj-$(CONFIG_TINYDRM_ILI9341) += ili9341.o +obj-$(CONFIG_TINYDRM_ILI9486) += ili9486.o obj-$(CONFIG_TINYDRM_MI0283QT) += mi0283qt.o obj-$(CONFIG_TINYDRM_REPAPER) += repaper.o obj-$(CONFIG_TINYDRM_ST7586) += st7586.o diff --git a/drivers/gpu/drm/tiny/ili9486.c b/drivers/gpu/drm/tiny/ili9486.c new file mode 100644 index 0000000..e960b16 --- /dev/null +++ b/drivers/gpu/drm/tiny/ili9486.c @@ -0,0 +1,283 @@ +// SPDX-License-Identifier: GPL-2.0+ +/*

• • DRM driver for Ilitek ILI9486 panels
• • Copyright 2020 Kamlesh Gurudasani kamlesh.gurudasani@gmail.com
• */

+#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 <video/mipi_display.h>

+#include <drm/drm_atomic_helper.h> +#include <drm/drm_drv.h> +#include <drm/drm_fb_helper.h> +#include <drm/drm_gem_cma_helper.h> +#include <drm/drm_gem_framebuffer_helper.h> +#include <drm/drm_mipi_dbi.h> +#include <drm/drm_modeset_helper.h>

+#define ILI9486_ITFCTR1 0xb0 +#define ILI9486_PWCTRL1 0xc2 +#define ILI9486_VMCTRL1 0xc5 +#define ILI9486_PGAMCTRL 0xe0 +#define ILI9486_NGAMCTRL 0xe1 +#define ILI9486_DGAMCTRL 0xe2 +#define ILI9486_MADCTL_BGR BIT(3) +#define ILI9486_MADCTL_MV BIT(5) +#define ILI9486_MADCTL_MX BIT(6) +#define ILI9486_MADCTL_MY BIT(7)

+/*

• • The PiScreen/waveshare rpi-lcd-35 has a SPI to 16-bit parallel bus converter
• • in front of the display controller. This means that 8-bit values have to be
• • transferred as 16-bit.
• */

+static int waveshare_command(struct mipi_dbi *mipi, u8 *cmd, u8 *par, size_t num) +{

• struct spi_device *spi = mipi->spi;
• void *data = par;
• u32 speed_hz;
• int i, ret;
• u16 *buf;
• buf = kmalloc(32 * sizeof(u16), GFP_KERNEL);
• if (!buf)

• return -ENOMEM;
  

• /*

• * The displays are Raspberry Pi HATs and connected to the 8-bit only
  

• * SPI controller, so 16-bit command and parameters need byte swapping
  

• * before being transferred as 8-bit on the big endian SPI bus.
  

• * Pixel data bytes have already been swapped before this function is
  

• * called.
  

• */
  

• buf[0] = cpu_to_be16(*cmd);
• gpiod_set_value_cansleep(mipi->dc, 0);
• speed_hz = mipi_dbi_spi_cmd_max_speed(spi, 2);
• ret = mipi_dbi_spi_transfer(spi, speed_hz, 8, buf, 2);
• if (ret || !num)

• goto free;
  

• /* 8-bit configuration data, not 16-bit pixel data */
• if (num <= 32) {

• for (i = 0; i < num; i++)
  

• 	buf[i] = cpu_to_be16(par[i]);
  

• num *= 2;
  

• speed_hz = mipi_dbi_spi_cmd_max_speed(spi, num);
  

• data = buf;
  

• }
• gpiod_set_value_cansleep(mipi->dc, 1);
• ret = mipi_dbi_spi_transfer(spi, speed_hz, 8, data, num);
• free:
• kfree(buf);
• return ret;

+}

+static void waveshare_enable(struct drm_simple_display_pipe *pipe,

• 	   struct drm_crtc_state *crtc_state,
  

• 	   struct drm_plane_state *plane_state)
  

+{

• struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev);
• struct mipi_dbi *dbi = &dbidev->dbi;
• u8 addr_mode;
• int ret, idx;
• if (!drm_dev_enter(pipe->crtc.dev, &idx))

• return;
  

• DRM_DEBUG_KMS("\n");
• ret = mipi_dbi_poweron_conditional_reset(dbidev);
• if (ret < 0)

• goto out_exit;
  

• if (ret == 1)

• goto out_enable;
  

• mipi_dbi_command(dbi, ILI9486_ITFCTR1);
• mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
• msleep(250);
• mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT, 0x55);
• mipi_dbi_command(dbi, ILI9486_PWCTRL1, 0x44);
• mipi_dbi_command(dbi, ILI9486_VMCTRL1, 0x00, 0x00, 0x00, 0x00);
• mipi_dbi_command(dbi, ILI9486_PGAMCTRL,

• 	 0x0F, 0x1F, 0x1C, 0x0C, 0x0F, 0x08, 0x48, 0x98,
  

• 	 0x37, 0x0A, 0x13, 0x04, 0x11, 0x0D, 0x0);
  

• mipi_dbi_command(dbi, ILI9486_NGAMCTRL,

• 	 0x0F, 0x32, 0x2E, 0x0B, 0x0D, 0x05, 0x47, 0x75,
  

• 	 0x37, 0x06, 0x10, 0x03, 0x24, 0x20, 0x00);
  

• mipi_dbi_command(dbi, ILI9486_DGAMCTRL,

• 	 0x0F, 0x32, 0x2E, 0x0B, 0x0D, 0x05, 0x47, 0x75,
  

• 	 0x37, 0x06, 0x10, 0x03, 0x24, 0x20, 0x00);
  

• mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);
• msleep(100);
• out_enable:
• switch (dbidev->rotation) {
• case 90:

• addr_mode = ILI9486_MADCTL_MY;
  

• break;
  

• case 180:

• addr_mode = ILI9486_MADCTL_MV;
  

• break;
  

• case 270:

• addr_mode = ILI9486_MADCTL_MX;
  

• break;
  

• default:

• addr_mode = ILI9486_MADCTL_MV | ILI9486_MADCTL_MY |
  

• 	ILI9486_MADCTL_MX;
  

• break;
  

• }
• addr_mode |= ILI9486_MADCTL_BGR;
• mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
• mipi_dbi_enable_flush(dbidev, crtc_state, plane_state);
• out_exit:
• drm_dev_exit(idx);

+}

+static const struct drm_simple_display_pipe_funcs waveshare_pipe_funcs = {

• .enable = waveshare_enable,
• .disable = mipi_dbi_pipe_disable,
• .update = mipi_dbi_pipe_update,
• .prepare_fb = drm_gem_fb_simple_display_pipe_prepare_fb,

+};

+static const struct drm_display_mode waveshare_mode = {

• DRM_SIMPLE_MODE(480, 320, 73, 49),

+};

+DEFINE_DRM_GEM_CMA_FOPS(ili9486_fops);

+static struct drm_driver ili9486_driver = {

• .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
• .fops = &ili9486_fops,
• .release = mipi_dbi_release,
• DRM_GEM_CMA_VMAP_DRIVER_OPS,
• .debugfs_init = mipi_dbi_debugfs_init,
• .name = "ili9486",
• .desc = "Ilitek ILI9486",
• .date = "20200118",
• .major = 1,
• .minor = 0,

+};

+static const struct of_device_id ili9486_of_match[] = {

• { .compatible = "waveshare,rpi-lcd-35" },
• { .compatible = "ozzmaker,piscreen" },
• {},

+}; +MODULE_DEVICE_TABLE(of, ili9486_of_match);

+static const struct spi_device_id ili9486_id[] = {

• { "ili9486", 0 },
• { }

+}; +MODULE_DEVICE_TABLE(spi, ili9486_id);

+static int ili9486_probe(struct spi_device *spi) +{

• struct device *dev = &spi->dev;
• struct mipi_dbi_dev *dbidev;
• struct drm_device *drm;
• struct mipi_dbi *dbi;
• struct gpio_desc *dc;
• u32 rotation = 0;
• int ret;
• dbidev = kzalloc(sizeof(*dbidev), GFP_KERNEL);
• if (!dbidev)

• return -ENOMEM;
  

• dbi = &dbidev->dbi;
• drm = &dbidev->drm;
• ret = devm_drm_dev_init(dev, drm, &ili9486_driver);
• if (ret) {

• kfree(dbidev);
  

• return ret;
  

• }
• drm_mode_config_init(drm);
• dbi->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
• if (IS_ERR(dbi->reset)) {

• DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n");
  

• return PTR_ERR(dbi->reset);
  

• }
• 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);
  

• }
• dbidev->backlight = devm_of_find_backlight(dev);
• if (IS_ERR(dbidev->backlight))

• return PTR_ERR(dbidev->backlight);
  

• device_property_read_u32(dev, "rotation", &rotation);
• ret = mipi_dbi_spi_init(spi, dbi, dc);
• if (ret)

• return ret;
  

• dbi->command = waveshare_command;
• dbi->read_commands = NULL;
• ret = mipi_dbi_dev_init(dbidev, &waveshare_pipe_funcs, &waveshare_mode, rotation);
• if (ret)

• return ret;
  

• drm_mode_config_reset(drm);
• ret = drm_dev_register(drm, 0);
• if (ret)

• return ret;
  

• spi_set_drvdata(spi, drm);
• drm_fbdev_generic_setup(drm, 0);
• return 0;

+}

+static int ili9486_remove(struct spi_device *spi) +{

• struct drm_device *drm = spi_get_drvdata(spi);
• drm_dev_unplug(drm);
• drm_atomic_helper_shutdown(drm);
• return 0;

+}

+static void ili9486_shutdown(struct spi_device *spi) +{

• drm_atomic_helper_shutdown(spi_get_drvdata(spi));

+}

+static struct spi_driver ili9486_spi_driver = {

• .driver = {

• .name = "ili9486",
  

• .of_match_table = ili9486_of_match,
  

• },
• .id_table = ili9486_id,
• .probe = ili9486_probe,
• .remove = ili9486_remove,
• .shutdown = ili9486_shutdown,

+}; +module_spi_driver(ili9486_spi_driver);

+MODULE_DESCRIPTION("Ilitek ILI9486 DRM driver"); +MODULE_AUTHOR("Kamlesh Gurudasani kamlesh.gurudasani@gmail.com");

+MODULE_LICENSE("GPL");

2.7.4