Hi Josef.
Thanks for updating the driver.
On Mon, Jul 08, 2019 at 04:56:18PM +0200, Josef Lusticky wrote:
> Add driver for Ilitek ILI9341 panels in parallel RGB mode
>
> Signed-off-by: Josef Lusticky <jo...@lusticky.cz>
> + */
> +
> +#include <linux/backlight.h>
> +#include <linux/delay.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/module.h>
> +#include <linux/of_device.h>
> +#include <linux/spi/spi.h>
> +
> +#include <video/mipi_display.h>
> +
> +#include <drm/drm_modes.h>
> +#include <drm/drm_panel.h>
> +#include <drm/drm_print.h>
> +#include <drm/tinydrm/mipi-dbi.h>
Good to see drivers that no longer uses drmP.h :-)
> +
> +/* ILI9341 extended register set (Vendor Command Set) */
> +#define ILI9341_IFMODE 0xB0 // clock polarity
> +#define ILI9341_IFCTL 0xF6 // interface conrol
> +#define ILI9341_PGAMCTRL 0xE0 // positive gamma control
> +#define ILI9341_NGAMCTRL 0xE1 // negative gamma control
> +
> +#define ILI9341_MADCTL_MV BIT(5)
> +#define ILI9341_MADCTL_MX BIT(6)
> +#define ILI9341_MADCTL_MY BIT(7)
> +
> +/**
> + * struct ili9341_config - the display specific configuration
> + * @width_mm: physical panel width [mm]
> + * @height_mm: physical panel height [mm]
> + */
> +struct ili9341_config {
> + u32 width_mm;
> + u32 height_mm;
> +};
> +
> +struct ili9341 {
> + struct drm_panel panel;
> + struct mipi_dbi *mipi;
> + const struct ili9341_config *conf;
> +};
> +
> +static inline struct ili9341 *panel_to_ili9341(struct drm_panel *panel)
> +{
> + return container_of(panel, struct ili9341, panel);
> +}
> +
> +static int ili9341_deinit(struct drm_panel *panel, struct ili9341 *ili)
> +{
> + mipi_dbi_command(ili->mipi, MIPI_DCS_SET_DISPLAY_OFF);
> + mipi_dbi_command(ili->mipi, MIPI_DCS_ENTER_SLEEP_MODE);
> + msleep(5);
> + return 0;
> +}
> +
> +static int ili9341_init(struct drm_panel *panel, struct ili9341 *ili)
> +{
> + /* HW / SW Reset display and wait */
> + if (ili->mipi->reset)
> + mipi_dbi_hw_reset(ili->mipi);
> +
> + mipi_dbi_command(ili->mipi, MIPI_DCS_SOFT_RESET);
> + msleep(120);
Consider a usleep_range here - to have the waiting a little more relaxed
in the system.
> +
> + /* Polarity */
> + mipi_dbi_command(ili->mipi, ILI9341_IFMODE, 0xC0);
> +
> + /* Interface control */
> + mipi_dbi_command(ili->mipi, ILI9341_IFCTL, 0x09, 0x01, 0x26);
> +
> + /* Pixel format */
> + mipi_dbi_command(ili->mipi, MIPI_DCS_SET_PIXEL_FORMAT,
> MIPI_DCS_PIXEL_FMT_18BIT << 4);
> +
> + /* Gamma */
> + mipi_dbi_command(ili->mipi, MIPI_DCS_SET_GAMMA_CURVE, 0x01);
> + mipi_dbi_command(ili->mipi, ILI9341_PGAMCTRL,
> + 0x0f, 0x31, 0x2b, 0x0c, 0x0e, 0x08, 0x4e, 0xf1,
> + 0x37, 0x07, 0x10, 0x03, 0x0e, 0x09, 0x00);
> + mipi_dbi_command(ili->mipi, ILI9341_NGAMCTRL,
> + 0x00, 0x0e, 0x14, 0x03, 0x11, 0x07, 0x31, 0xc1,
> + 0x48, 0x08, 0x0f, 0x0c, 0x31, 0x36, 0x0f);
> +
> + /* Rotation */
> + mipi_dbi_command(ili->mipi, MIPI_DCS_SET_ADDRESS_MODE,
> ILI9341_MADCTL_MX);
> +
> + /* Exit sleep mode */
> + mipi_dbi_command(ili->mipi, MIPI_DCS_EXIT_SLEEP_MODE);
> + msleep(120);
> +
> + mipi_dbi_command(ili->mipi, MIPI_DCS_SET_DISPLAY_ON);
> +
> + return 0;
> +}
> +
> +static int ili9341_unprepare(struct drm_panel *panel)
> +{
> + struct ili9341 *ili = panel_to_ili9341(panel);
> +
> + return ili9341_deinit(panel, ili);
> +}
> +
> +static int ili9341_prepare(struct drm_panel *panel)
> +{
> + struct ili9341 *ili = panel_to_ili9341(panel);
> + int ret;
> +
> + ret = ili9341_init(panel, ili);
> + if (ret < 0)
> + ili9341_unprepare(panel);
> + return ret;
> +}
> +
> +static int ili9341_enable(struct drm_panel *panel)
> +{
> + struct ili9341 *ili = panel_to_ili9341(panel);
> +
> + return backlight_enable(ili->mipi->backlight);
> +}
> +
> +static int ili9341_disable(struct drm_panel *panel)
> +{
> + struct ili9341 *ili = panel_to_ili9341(panel);
> +
> + return backlight_disable(ili->mipi->backlight);
> +}
> +
> +static const struct drm_display_mode prgb_240x320_mode = {
> + .clock = 6350,
> +
> + .hdisplay = 240,
> + .hsync_start = 240 + 10,
> + .hsync_end = 240 + 10 + 10,
> + .htotal = 240 + 10 + 10 + 20,
> +
> + .vdisplay = 320,
> + .vsync_start = 320 + 4,
> + .vsync_end = 320 + 4 + 2,
> + .vtotal = 320 + 4 + 2 + 2,
> +
> + .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
> + .type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED
> +};
> +
> +static int ili9341_get_modes(struct drm_panel *panel)
> +{
> + struct drm_connector *connector = panel->connector;
> + struct ili9341 *ili = panel_to_ili9341(panel);
> + struct drm_display_mode *mode;
> +
> + mode = drm_mode_duplicate(panel->drm, &prgb_240x320_mode);
> + if (!mode) {
> + DRM_DEV_ERROR(panel->drm->dev, "bad mode or failed to add
> mode\n");
> + return -ENOMEM;
> + }
> +
> + drm_mode_set_name(mode);
> +
> + mode->width_mm = ili->conf->width_mm;
> + mode->height_mm = ili->conf->height_mm;
> +
> + connector->display_info.width_mm = mode->width_mm;
> + connector->display_info.height_mm = mode->height_mm;
> + connector->display_info.bus_flags |= DRM_BUS_FLAG_DE_HIGH |
> + DRM_BUS_FLAG_PIXDATA_POSEDGE | DRM_BUS_FLAG_SYNC_NEGEDGE;
> +
> + drm_mode_probed_add(connector, mode);
> +
> + return 1; /* Number of modes */
> +}
> +
> +static const struct drm_panel_funcs ili9341_drm_funcs = {
> + .disable = ili9341_disable,
> + .unprepare = ili9341_unprepare,
> + .prepare = ili9341_prepare,
> + .enable = ili9341_enable,
> + .get_modes = ili9341_get_modes,
> +};
> +
> +static int ili9341_probe(struct spi_device *spi)
> +{
> + struct device *dev = &spi->dev;
> + struct ili9341 *ili;
> + struct mipi_dbi *mipi;
> + struct gpio_desc *dc_gpio;
> + int ret;
> +
> + mipi = devm_kzalloc(dev, sizeof(*mipi), GFP_KERNEL);
> + if (!mipi)
> + return -ENOMEM;
> +
> + ili = devm_kzalloc(dev, sizeof(*ili), GFP_KERNEL);
> + if (!ili)
> + return -ENOMEM;
> +
> + ili->mipi = mipi;
> +
> + spi_set_drvdata(spi, ili);
> +
> + /*
> + * Every new incarnation of this display must have a unique
> + * data entry for the system in this driver.
> + */
> + ili->conf = of_device_get_match_data(dev);
> + if (!ili->conf) {
> + DRM_DEV_ERROR(dev, "missing device configuration\n");
> + return -ENODEV;
> + }
> +
> + ili->mipi->reset = devm_gpiod_get_optional(dev, "reset",
> GPIOD_OUT_HIGH);
> + if (IS_ERR(ili->mipi->reset)) {
> + DRM_DEV_ERROR(dev, "failed to get gpio 'reset'\n");
> + return PTR_ERR(ili->mipi->reset);
> + }
> +
> + ili->mipi->backlight = devm_of_find_backlight(dev);
> + if (IS_ERR(ili->mipi->backlight)) {
> + DRM_DEV_ERROR(dev, "failed to get backlight\n");
> + return PTR_ERR(ili->mipi->backlight);
> + }
> +
> + dc_gpio = devm_gpiod_get_optional(dev, "dc", GPIOD_OUT_LOW);
> + if (IS_ERR(dc_gpio)) {
> + DRM_DEV_ERROR(dev, "failed to get gpio 'dc'\n");
> + return PTR_ERR(dc_gpio);
> + }
> +
> + ret = mipi_dbi_spi_init(spi, ili->mipi, dc_gpio);
> + if (ret) {
> + DRM_DEV_ERROR(dev, "MIPI-DBI SPI setup failed\n");
> + return ret;
> + }
> +
> + drm_panel_init(&ili->panel);
> + ili->panel.dev = dev;
> + ili->panel.funcs = &ili9341_drm_funcs;
> +
> + return drm_panel_add(&ili->panel);
> +}
> +
> +static int ili9341_remove(struct spi_device *spi)
> +{
> + struct ili9341 *ili = spi_get_drvdata(spi);
> +
> + drm_panel_remove(&ili->panel);
> +
> + ili9341_disable(&ili->panel);
> + ili9341_unprepare(&ili->panel);
> +
> + return 0;
> +}
> +
> +static const struct ili9341_config dt024ctft_data = {
> + .width_mm = 37,
> + .height_mm = 49,
> +};
> +
> +static const struct of_device_id ili9341_of_match[] = {
> + { .compatible = "displaytech,dt024ctft", .data = &dt024ctft_data },
> + { /* sentinel */ }
> +};
If another display is supported then the drm_display_mode may not match.
So the above may not prove enough in the future.
for now it should be fine.
> +MODULE_DEVICE_TABLE(of, ili9341_of_match);
> +
> +static struct spi_driver ili9341_driver = {
> + .probe = ili9341_probe,
> + .remove = ili9341_remove,
> + .driver = {
> + .name = "panel-ilitek-ili9341",
> + .of_match_table = ili9341_of_match,
> + },
> +};
> +module_spi_driver(ili9341_driver);
> +
> +MODULE_AUTHOR("Josef Lusticky <jo...@lusticky.cz>");
> +MODULE_DESCRIPTION("ILI9341 LCD panel driver");
> +MODULE_LICENSE("GPL");
Looks good.
Reviewed-by: Sam Ravnborg <s...@ravnborg.org>
Sam
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