On 08.10.2018 12:58, Linus Walleij wrote:
> The Samsung S6D16D0 is a simple comman mode only DSI display
> that is used on the ST-Ericsson Ux500 reference design
> TVK1281618 user interface board (UIB).
>
> Signed-off-by: Linus Walleij <linus.wall...@linaro.org>
> ---
> drivers/gpu/drm/panel/Kconfig | 7 +
> drivers/gpu/drm/panel/Makefile | 1 +
> drivers/gpu/drm/panel/panel-samsung-s6d16d0.c | 235 ++++++++++++++++++
> 3 files changed, 243 insertions(+)
> create mode 100644 drivers/gpu/drm/panel/panel-samsung-s6d16d0.c
>
> diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
> index 6020c30a33b3..2aacffee7a86 100644
> --- a/drivers/gpu/drm/panel/Kconfig
> +++ b/drivers/gpu/drm/panel/Kconfig
> @@ -126,6 +126,13 @@ config DRM_PANEL_RAYDIUM_RM68200
> Say Y here if you want to enable support for Raydium RM68200
> 720x1280 DSI video mode panel.
>
> +config DRM_PANEL_SAMSUNG_S6D16D0
> + tristate "Samsung S6D16D0 DSI video mode panel"
> + depends on OF
> + depends on DRM_MIPI_DSI
> + depends on BACKLIGHT_CLASS_DEVICE
> + select VIDEOMODE_HELPERS
> +
> config DRM_PANEL_SAMSUNG_S6E3HA2
> tristate "Samsung S6E3HA2 DSI video mode panel"
> depends on OF
> diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
> index 5ccaaa9d13af..b52e5c5804ca 100644
> --- a/drivers/gpu/drm/panel/Makefile
> +++ b/drivers/gpu/drm/panel/Makefile
> @@ -12,6 +12,7 @@ obj-$(CONFIG_DRM_PANEL_PANASONIC_VVX10F034N00) +=
> panel-panasonic-vvx10f034n00.o
> obj-$(CONFIG_DRM_PANEL_RASPBERRYPI_TOUCHSCREEN) +=
> panel-raspberrypi-touchscreen.o
> obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM68200) += panel-raydium-rm68200.o
> obj-$(CONFIG_DRM_PANEL_SAMSUNG_LD9040) += panel-samsung-ld9040.o
> +obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6D16D0) += panel-samsung-s6d16d0.o
> obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E3HA2) += panel-samsung-s6e3ha2.o
> obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E63J0X03) += panel-samsung-s6e63j0x03.o
> obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E8AA0) += panel-samsung-s6e8aa0.o
> diff --git a/drivers/gpu/drm/panel/panel-samsung-s6d16d0.c
> b/drivers/gpu/drm/panel/panel-samsung-s6d16d0.c
> new file mode 100644
> index 000000000000..da93484ee22f
> --- /dev/null
> +++ b/drivers/gpu/drm/panel/panel-samsung-s6d16d0.c
> @@ -0,0 +1,235 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * MIPI-DSI Samsung s6d16d0 panel driver. This is a 864x480
> + * AMOLED panel with a command-only DSI interface.
> + */
> +
> +#include <drm/drmP.h>
> +#include <drm/drm_mipi_dsi.h>
> +#include <drm/drm_panel.h>
> +
> +#include <linux/gpio/consumer.h>
> +#include <linux/regulator/consumer.h>
> +
> +struct s6d16d0 {
> + struct device *dev;
> + struct drm_panel panel;
> + struct regulator *supply;
> + struct gpio_desc *reset_gpio;
> +};
> +
> +/*
> + * The timings are not very helpful as the display is used in
> + * command mode.
> + */
> +static const struct drm_display_mode samsung_s6d16d0_mode = {
> + .clock = 420160, /* HS 420160kHz, LP 19200kHz */
> + .hdisplay = 864,
> + .hsync_start = 864 + 154,
> + .hsync_end = 864 + 154 + 16,
> + .htotal = 864 + 154 + 16 + 32,
> + .vdisplay = 480,
> + .vsync_start = 480 + 1,
> + .vsync_end = 480 + 1 + 1,
> + .vtotal = 480 + 1 + 1 + 1,
> + .vrefresh = 60,
> +};
htotal*vtotal*vrefresh should be equal to clock * 1000, even in command
mode, and they should be equal to TearingEffect signal frequency.
> +
> +static inline struct s6d16d0 *panel_to_s6d16d0(struct drm_panel *panel)
> +{
> + return container_of(panel, struct s6d16d0, panel);
> +}
> +
> +static int s6d16d0_unprepare(struct drm_panel *panel)
> +{
> + struct s6d16d0 *s6 = panel_to_s6d16d0(panel);
> + struct mipi_dsi_device *dsi = to_mipi_dsi_device(s6->dev);
> + int ret;
> +
> + /* Exit sleep mode and power on */
> + ret = mipi_dsi_dcs_set_display_off(dsi);
> + if (ret) {
> + dev_err(s6->dev, "failed to turn display off\n");
> + return ret;
> + }
> + ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
> + if (ret) {
> + dev_err(s6->dev, "failed to enter sleep mode\n");
> + return ret;
> + }
Usually display_off should be called from _disable callback and enter
sleep mode and power off from _unprepare callback, symmetrically on
power-on path.
Moreover usually there should be some delays between these commands to
allow panel to enter appropriate states.
> +
> + /* Assert RESET */
> + gpiod_set_value_cansleep(s6->reset_gpio, 1);
> + regulator_disable(s6->supply);
> +
> + return 0;
> +}
> +
> +static int s6d16d0_prepare(struct drm_panel *panel)
> +{
> + struct s6d16d0 *s6 = panel_to_s6d16d0(panel);
> + struct mipi_dsi_device *dsi = to_mipi_dsi_device(s6->dev);
> + int ret;
> +
> + ret = regulator_enable(s6->supply);
> + if (ret) {
> + dev_err(s6->dev, "failed to enable supply: %d\n", ret);
> + return ret;
> + }
> +
> + /* Assert RESET */
> + gpiod_set_value_cansleep(s6->reset_gpio, 1);
> + udelay(10);
> + /* De-assert RESET */
> + gpiod_set_value_cansleep(s6->reset_gpio, 0);
> + msleep(120);
> +
> + /* Enabe tearing mode: send TE (tearing effect) at VBLANK */
> + ret = mipi_dsi_dcs_set_tear_on(dsi,
> + MIPI_DSI_DCS_TEAR_MODE_VBLANK);
So the panel does not signal TE to DisplayController via dedicated
line/gpio. I guess then it is up to DSI-master to deliver this signal to
DisplayController? Am I right? What DSI-master driver is used with this
panel?
> + if (ret) {
> + dev_err(s6->dev, "failed to enble vblank TE\n");
> + return ret;
> + }
> + /* Exit sleep mode and power on */
> + ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
> + if (ret) {
> + dev_err(s6->dev, "failed to exit sleep mode\n");
> + return ret;
> + }
> + ret = mipi_dsi_dcs_set_display_on(dsi);
> + if (ret) {
> + dev_err(s6->dev, "failed to turn display on\n");
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int s6d16d0_enable(struct drm_panel *panel)
> +{
> + return 0;
> +}
> +
> +static int s6d16d0_disable(struct drm_panel *panel)
> +{
> + return 0;
> +}
> +
> +static int s6d16d0_get_modes(struct drm_panel *panel)
> +{
> + struct drm_connector *connector = panel->connector;
> + struct drm_display_mode *mode;
> +
> + strncpy(connector->display_info.name, "Samsung S6D16D0\0",
> + DRM_DISPLAY_INFO_LEN);
> +
> + mode = drm_mode_duplicate(panel->drm, &samsung_s6d16d0_mode);
> + if (!mode) {
> + DRM_ERROR("bad mode or failed to add mode\n");
> + return -EINVAL;
> + }
> + drm_mode_set_name(mode);
> + mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
> +
> + mode->width_mm = 84;
> + mode->height_mm = 48;
> + connector->display_info.width_mm = mode->width_mm;
> + connector->display_info.height_mm = mode->height_mm;
> +
> + drm_mode_probed_add(connector, mode);
> +
> + return 1; /* Number of modes */
> +}
> +
> +static const struct drm_panel_funcs s6d16d0_drm_funcs = {
> + .disable = s6d16d0_disable,
> + .unprepare = s6d16d0_unprepare,
> + .prepare = s6d16d0_prepare,
> + .enable = s6d16d0_enable,
> + .get_modes = s6d16d0_get_modes,
> +};
> +
> +static int s6d16d0_probe(struct mipi_dsi_device *dsi)
> +{
> + struct device *dev = &dsi->dev;
> + struct s6d16d0 *s6;
> + int ret;
> +
> + s6 = devm_kzalloc(dev, sizeof(struct s6d16d0), GFP_KERNEL);
> + if (!s6)
> + return -ENOMEM;
> + mipi_dsi_set_drvdata(dsi, s6);
> + s6->dev = dev;
> +
> + dsi->lanes = 2;
> + dsi->format = MIPI_DSI_FMT_RGB888;
> + /*
> + * This display uses command mode so no MIPI_DSI_MODE_VIDEO
> + * or MIPI_DSI_MODE_VIDEO_SYNC_PULSE
> + *
> + * As we only send commands we do not need to be continously
> + * clocked.
> + */
> + dsi->mode_flags =
> + MIPI_DSI_CLOCK_NON_CONTINUOUS |
> + MIPI_DSI_MODE_EOT_PACKET;
> +
> + s6->supply = devm_regulator_get(dev, "vdd1");
> + if (IS_ERR(s6->supply))
> + return PTR_ERR(s6->supply);
> +
> + /* This asserts RESET by default */
> + s6->reset_gpio = devm_gpiod_get_optional(dev, "reset",
> + GPIOD_OUT_HIGH);
> + if (IS_ERR(s6->reset_gpio)) {
> + ret = PTR_ERR(s6->reset_gpio);
> + if (ret != -EPROBE_DEFER)
> + dev_err(dev, "failed to request GPIO: %d\n", ret);
> + return ret;
> + }
> +
> + drm_panel_init(&s6->panel);
> + s6->panel.dev = dev;
> + s6->panel.funcs = &s6d16d0_drm_funcs;
> +
> + ret = drm_panel_add(&s6->panel);
> + if (ret < 0)
> + return ret;
> +
> + ret = mipi_dsi_attach(dsi);
> + if (ret < 0)
> + drm_panel_remove(&s6->panel);
> +
> + return ret;
> +}
> +
> +static int s6d16d0_remove(struct mipi_dsi_device *dsi)
> +{
> + struct s6d16d0 *s6 = mipi_dsi_get_drvdata(dsi);
> +
> + mipi_dsi_detach(dsi);
> + drm_panel_remove(&s6->panel);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id s6d16d0_of_match[] = {
> + { .compatible = "samsung,s6d16d0" },
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, s6d16d0_of_match);
> +
> +static struct mipi_dsi_driver s6d16d0_driver = {
> + .probe = s6d16d0_probe,
> + .remove = s6d16d0_remove,
> + .driver = {
> + .name = "panel-samsung-s6d16d0",
> + .of_match_table = s6d16d0_of_match,
> + },
> +};
> +module_mipi_dsi_driver(s6d16d0_driver);
> +
> +MODULE_AUTHOR("Linus Wallei <linus.wall...@linaro.org>");
> +MODULE_DESCRIPTION("MIPI-DSI s6d16d0 Panel Driver");
> +MODULE_LICENSE("GPL v2");
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