Re: [PATCH v2 2/2] drm/panel: add visionox vtdr6130 DSI panel driver

From: Daniel Vetter
Date: Thu Jan 19 2023 - 05:53:26 EST

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On Mon, Jan 09, 2023 at 08:26:44PM +0100, Neil Armstrong wrote:
> On 09/01/2023 19:32, Sam Ravnborg wrote:
> > Hi Neil,
> >
> > On Mon, Jan 09, 2023 at 09:49:30AM +0100, Neil Armstrong wrote:
> > > Add support for the 1080x2400 Visionox VTDR6130 AMOLED DSI panel
> > > found on the Qualcomm SM8550 MTP board.
> > >
> > > By default the the panel is configured to work with DSI compressed
> > > streams, but can work in uncompressed video mode since 1080x2400 in
> > > RGB888 fits in the 4 DSI lanes bandwidth.
> > >
> > > While display compression is preferred for performance and power
> > > reasons, let's start with the uncompressed video mode support and
> > > add the DSC support later on.
> > >
> > > Signed-off-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx>
> >
> > One small nit about sorting include files.
> > At least I consider them wrongly sorted. Up to you if you fix it while
> > applying or you keep it as is.
>
> Indeed I also consider it wrong, I'll sort them while applying, thanks !

This goes boom on my gcc:

drivers/gpu/drm/panel/panel-visionox-vtdr6130.c: In function ‘visionox_vtdr6130_bl_update_status’:
drivers/gpu/drm/panel/panel-visionox-vtdr6130.c:249:12: error: ‘ret’ is used uninitialized [-Werror=uninitialized]
249 | if (ret < 0)
| ^
drivers/gpu/drm/panel/panel-visionox-vtdr6130.c:246:13: note: ‘ret’ was declared here
246 | int ret;
| ^~~

Cheers, Daniel

>
> >
> > Reviewed-by: Sam Ravnborg <sam@xxxxxxxxxxxx>
> >
> >
> > Sam
> >
> > > ---
> > > drivers/gpu/drm/panel/Kconfig | 8 +
> > > drivers/gpu/drm/panel/Makefile | 1 +
> > > drivers/gpu/drm/panel/panel-visionox-vtdr6130.c | 358 ++++++++++++++++++++++++
> > > 3 files changed, 367 insertions(+)
> > >
> > > diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
> > > index 737edcdf9eef..fd1d7e6f536b 100644
> > > --- a/drivers/gpu/drm/panel/Kconfig
> > > +++ b/drivers/gpu/drm/panel/Kconfig
> > > @@ -717,6 +717,14 @@ config DRM_PANEL_VISIONOX_RM69299
> > > Say Y here if you want to enable support for Visionox
> > > RM69299 DSI Video Mode panel.
> > > +config DRM_PANEL_VISIONOX_VTDR6130
> > > + tristate "Visionox VTDR6130"
> > > + depends on OF
> > > + depends on DRM_MIPI_DSI
> > > + help
> > > + Say Y here if you want to enable support for Visionox
> > > + VTDR6130 1080x2400 AMOLED DSI panel.
> > > +
> > > config DRM_PANEL_WIDECHIPS_WS2401
> > > tristate "Widechips WS2401 DPI panel driver"
> > > depends on SPI && GPIOLIB
> > > diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
> > > index f8f9d9f6a307..1966404fcf7a 100644
> > > --- a/drivers/gpu/drm/panel/Makefile
> > > +++ b/drivers/gpu/drm/panel/Makefile
> > > @@ -73,5 +73,6 @@ obj-$(CONFIG_DRM_PANEL_TPO_TD043MTEA1) += panel-tpo-td043mtea1.o
> > > obj-$(CONFIG_DRM_PANEL_TPO_TPG110) += panel-tpo-tpg110.o
> > > obj-$(CONFIG_DRM_PANEL_TRULY_NT35597_WQXGA) += panel-truly-nt35597.o
> > > obj-$(CONFIG_DRM_PANEL_VISIONOX_RM69299) += panel-visionox-rm69299.o
> > > +obj-$(CONFIG_DRM_PANEL_VISIONOX_VTDR6130) += panel-visionox-vtdr6130.o
> > > obj-$(CONFIG_DRM_PANEL_WIDECHIPS_WS2401) += panel-widechips-ws2401.o
> > > obj-$(CONFIG_DRM_PANEL_XINPENG_XPP055C272) += panel-xinpeng-xpp055c272.o
> > > diff --git a/drivers/gpu/drm/panel/panel-visionox-vtdr6130.c b/drivers/gpu/drm/panel/panel-visionox-vtdr6130.c
> > > new file mode 100644
> > > index 000000000000..c107c88b22b4
> > > --- /dev/null
> > > +++ b/drivers/gpu/drm/panel/panel-visionox-vtdr6130.c
> > > @@ -0,0 +1,358 @@
> > > +// SPDX-License-Identifier: GPL-2.0-only
> > > +// Copyright (c) 2023, Linaro Limited
> > > +
> > > +#include <linux/backlight.h>
> > > +#include <linux/delay.h>
> > > +#include <linux/gpio/consumer.h>
> > > +#include <linux/regulator/consumer.h>
> > > +#include <linux/module.h>
> > > +#include <linux/of.h>
> > > +
> > > +#include <drm/drm_mipi_dsi.h>
> > > +#include <drm/drm_modes.h>
> > > +#include <drm/drm_panel.h>
> > > +#include <drm/display/drm_dsc.h>
> > Sort - display/, before drm_
> > > +
> > > +#include <video/mipi_display.h>
> > > +
> > > +struct visionox_vtdr6130 {
> > > + struct drm_panel panel;
> > > + struct mipi_dsi_device *dsi;
> > > + struct gpio_desc *reset_gpio;
> > > + struct regulator_bulk_data supplies[3];
> > > + bool prepared;
> > > +};
> > > +
> > > +static inline struct visionox_vtdr6130 *to_visionox_vtdr6130(struct drm_panel *panel)
> > > +{
> > > + return container_of(panel, struct visionox_vtdr6130, panel);
> > > +}
> > > +
> > > +static void visionox_vtdr6130_reset(struct visionox_vtdr6130 *ctx)
> > > +{
> > > + gpiod_set_value_cansleep(ctx->reset_gpio, 0);
> > > + usleep_range(10000, 11000);
> > > + gpiod_set_value_cansleep(ctx->reset_gpio, 1);
> > > + usleep_range(10000, 11000);
> > > + gpiod_set_value_cansleep(ctx->reset_gpio, 0);
> > > + usleep_range(10000, 11000);
> > > +}
> > > +
> > > +static int visionox_vtdr6130_on(struct visionox_vtdr6130 *ctx)
> > > +{
> > > + struct mipi_dsi_device *dsi = ctx->dsi;
> > > + struct device *dev = &dsi->dev;
> > > + int ret;
> > > +
> > > + dsi->mode_flags |= MIPI_DSI_MODE_LPM;
> > > +
> > > + ret = mipi_dsi_dcs_set_tear_on(dsi, MIPI_DSI_DCS_TEAR_MODE_VBLANK);
> > > + if (ret)
> > > + return ret;
> > > +
> > > + mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_WRITE_CONTROL_DISPLAY, 0x20);
> > > + mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_SET_DISPLAY_BRIGHTNESS, 0x00, 0x00);
> > > + mipi_dsi_dcs_write_seq(dsi, 0x59, 0x09);
> > > + mipi_dsi_dcs_write_seq(dsi, 0x6c, 0x01);
> > > + mipi_dsi_dcs_write_seq(dsi, 0x6d, 0x00);
> > > + mipi_dsi_dcs_write_seq(dsi, 0x6f, 0x01);
> > > + mipi_dsi_dcs_write_seq(dsi, 0x70,
> > > + 0x12, 0x00, 0x00, 0xab, 0x30, 0x80, 0x09, 0x60, 0x04,
> > > + 0x38, 0x00, 0x28, 0x02, 0x1c, 0x02, 0x1c, 0x02, 0x00,
> > > + 0x02, 0x0e, 0x00, 0x20, 0x03, 0xdd, 0x00, 0x07, 0x00,
> > > + 0x0c, 0x02, 0x77, 0x02, 0x8b, 0x18, 0x00, 0x10, 0xf0,
> > > + 0x07, 0x10, 0x20, 0x00, 0x06, 0x0f, 0x0f, 0x33, 0x0e,
> > > + 0x1c, 0x2a, 0x38, 0x46, 0x54, 0x62, 0x69, 0x70, 0x77,
> > > + 0x79, 0x7b, 0x7d, 0x7e, 0x02, 0x02, 0x22, 0x00, 0x2a,
> > > + 0x40, 0x2a, 0xbe, 0x3a, 0xfc, 0x3a, 0xfa, 0x3a, 0xf8,
> > > + 0x3b, 0x38, 0x3b, 0x78, 0x3b, 0xb6, 0x4b, 0xb6, 0x4b,
> > > + 0xf4, 0x4b, 0xf4, 0x6c, 0x34, 0x84, 0x74, 0x00, 0x00,
> > > + 0x00, 0x00, 0x00, 0x00);
> > > + mipi_dsi_dcs_write_seq(dsi, 0xf0, 0xaa, 0x10);
> > > + mipi_dsi_dcs_write_seq(dsi, 0xb1,
> > > + 0x01, 0x38, 0x00, 0x14, 0x00, 0x1c, 0x00, 0x01, 0x66,
> > > + 0x00, 0x14, 0x00, 0x14, 0x00, 0x01, 0x66, 0x00, 0x14,
> > > + 0x05, 0xcc, 0x00);
> > > + mipi_dsi_dcs_write_seq(dsi, 0xf0, 0xaa, 0x13);
> > > + mipi_dsi_dcs_write_seq(dsi, 0xce,
> > > + 0x09, 0x11, 0x09, 0x11, 0x08, 0xc1, 0x07, 0xfa, 0x05,
> > > + 0xa4, 0x00, 0x3c, 0x00, 0x34, 0x00, 0x24, 0x00, 0x0c,
> > > + 0x00, 0x0c, 0x04, 0x00, 0x35);
> > > + mipi_dsi_dcs_write_seq(dsi, 0xf0, 0xaa, 0x14);
> > > + mipi_dsi_dcs_write_seq(dsi, 0xb2, 0x03, 0x33);
> > > + mipi_dsi_dcs_write_seq(dsi, 0xb4,
> > > + 0x00, 0x33, 0x00, 0x00, 0x00, 0x3e, 0x00, 0x00, 0x00,
> > > + 0x3e, 0x00, 0x00);
> > > + mipi_dsi_dcs_write_seq(dsi, 0xb5,
> > > + 0x00, 0x09, 0x09, 0x09, 0x09, 0x09, 0x09, 0x06, 0x01);
> > > + mipi_dsi_dcs_write_seq(dsi, 0xb9, 0x00, 0x00, 0x08, 0x09, 0x09, 0x09);
> > > + mipi_dsi_dcs_write_seq(dsi, 0xbc,
> > > + 0x10, 0x00, 0x00, 0x06, 0x11, 0x09, 0x3b, 0x09, 0x47,
> > > + 0x09, 0x47, 0x00);
> > > + mipi_dsi_dcs_write_seq(dsi, 0xbe,
> > > + 0x10, 0x10, 0x00, 0x08, 0x22, 0x09, 0x19, 0x09, 0x25,
> > > + 0x09, 0x25, 0x00);
> > > + mipi_dsi_dcs_write_seq(dsi, 0xff, 0x5a, 0x80);
> > > + mipi_dsi_dcs_write_seq(dsi, 0x65, 0x14);
> > > + mipi_dsi_dcs_write_seq(dsi, 0xfa, 0x08, 0x08, 0x08);
> > > + mipi_dsi_dcs_write_seq(dsi, 0xff, 0x5a, 0x81);
> > > + mipi_dsi_dcs_write_seq(dsi, 0x65, 0x05);
> > > + mipi_dsi_dcs_write_seq(dsi, 0xf3, 0x0f);
> > > + mipi_dsi_dcs_write_seq(dsi, 0xf0, 0xaa, 0x00);
> > > + mipi_dsi_dcs_write_seq(dsi, 0xff, 0x5a, 0x82);
> > > + mipi_dsi_dcs_write_seq(dsi, 0xf9, 0x00);
> > > + mipi_dsi_dcs_write_seq(dsi, 0xff, 0x51, 0x83);
> > > + mipi_dsi_dcs_write_seq(dsi, 0x65, 0x04);
> > > + mipi_dsi_dcs_write_seq(dsi, 0xf8, 0x00);
> > > + mipi_dsi_dcs_write_seq(dsi, 0xff, 0x5a, 0x00);
> > > + mipi_dsi_dcs_write_seq(dsi, 0x65, 0x01);
> > > + mipi_dsi_dcs_write_seq(dsi, 0xf4, 0x9a);
> > > + mipi_dsi_dcs_write_seq(dsi, 0xff, 0x5a, 0x00);
> > > +
> > > + ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
> > > + if (ret < 0) {
> > > + dev_err(dev, "Failed to exit sleep mode: %d\n", ret);
> > > + return ret;
> > > + }
> > > + msleep(120);
> > > +
> > > + ret = mipi_dsi_dcs_set_display_on(dsi);
> > > + if (ret < 0) {
> > > + dev_err(dev, "Failed to set display on: %d\n", ret);
> > > + return ret;
> > > + }
> > > + msleep(20);
> > > +
> > > + return 0;
> > > +}
> > > +
> > > +static int visionox_vtdr6130_off(struct visionox_vtdr6130 *ctx)
> > > +{
> > > + struct mipi_dsi_device *dsi = ctx->dsi;
> > > + struct device *dev = &dsi->dev;
> > > + int ret;
> > > +
> > > + dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
> > > +
> > > + ret = mipi_dsi_dcs_set_display_off(dsi);
> > > + if (ret < 0) {
> > > + dev_err(dev, "Failed to set display off: %d\n", ret);
> > > + return ret;
> > > + }
> > > + msleep(20);
> > > +
> > > + ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
> > > + if (ret < 0) {
> > > + dev_err(dev, "Failed to enter sleep mode: %d\n", ret);
> > > + return ret;
> > > + }
> > > + msleep(120);
> > > +
> > > + return 0;
> > > +}
> > > +
> > > +static int visionox_vtdr6130_prepare(struct drm_panel *panel)
> > > +{
> > > + struct visionox_vtdr6130 *ctx = to_visionox_vtdr6130(panel);
> > > + struct device *dev = &ctx->dsi->dev;
> > > + int ret;
> > > +
> > > + if (ctx->prepared)
> > > + return 0;
> > > +
> > > + ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies),
> > > + ctx->supplies);
> > > + if (ret < 0)
> > > + return ret;
> > > +
> > > + visionox_vtdr6130_reset(ctx);
> > > +
> > > + ret = visionox_vtdr6130_on(ctx);
> > > + if (ret < 0) {
> > > + dev_err(dev, "Failed to initialize panel: %d\n", ret);
> > > + gpiod_set_value_cansleep(ctx->reset_gpio, 1);
> > > + regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
> > > + return ret;
> > > + }
> > > +
> > > + ctx->prepared = true;
> > > + return 0;
> > > +}
> > > +
> > > +static int visionox_vtdr6130_unprepare(struct drm_panel *panel)
> > > +{
> > > + struct visionox_vtdr6130 *ctx = to_visionox_vtdr6130(panel);
> > > + struct device *dev = &ctx->dsi->dev;
> > > + int ret;
> > > +
> > > + if (!ctx->prepared)
> > > + return 0;
> > > +
> > > + ret = visionox_vtdr6130_off(ctx);
> > > + if (ret < 0)
> > > + dev_err(dev, "Failed to un-initialize panel: %d\n", ret);
> > > +
> > > + gpiod_set_value_cansleep(ctx->reset_gpio, 1);
> > > +
> > > + regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
> > > +
> > > + ctx->prepared = false;
> > > + return 0;
> > > +}
> > > +
> > > +static const struct drm_display_mode visionox_vtdr6130_mode = {
> > > + .clock = (1080 + 20 + 2 + 20) * (2400 + 20 + 2 + 18) * 144 / 1000,
> > > + .hdisplay = 1080,
> > > + .hsync_start = 1080 + 20,
> > > + .hsync_end = 1080 + 20 + 2,
> > > + .htotal = 1080 + 20 + 2 + 20,
> > > + .vdisplay = 2400,
> > > + .vsync_start = 2400 + 20,
> > > + .vsync_end = 2400 + 20 + 2,
> > > + .vtotal = 2400 + 20 + 2 + 18,
> > > + .width_mm = 71,
> > > + .height_mm = 157,
> > > +};
> > > +
> > > +static int visionox_vtdr6130_get_modes(struct drm_panel *panel,
> > > + struct drm_connector *connector)
> > > +{
> > > + struct drm_display_mode *mode;
> > > +
> > > + mode = drm_mode_duplicate(connector->dev, &visionox_vtdr6130_mode);
> > > + if (!mode)
> > > + return -ENOMEM;
> > > +
> > > + drm_mode_set_name(mode);
> > > +
> > > + mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
> > > + connector->display_info.width_mm = mode->width_mm;
> > > + connector->display_info.height_mm = mode->height_mm;
> > > + drm_mode_probed_add(connector, mode);
> > > +
> > > + return 1;
> > > +}
> > > +
> > > +static const struct drm_panel_funcs visionox_vtdr6130_panel_funcs = {
> > > + .prepare = visionox_vtdr6130_prepare,
> > > + .unprepare = visionox_vtdr6130_unprepare,
> > > + .get_modes = visionox_vtdr6130_get_modes,
> > > +};
> > > +
> > > +static int visionox_vtdr6130_bl_update_status(struct backlight_device *bl)
> > > +{
> > > + struct mipi_dsi_device *dsi = bl_get_data(bl);
> > > + u16 brightness = backlight_get_brightness(bl);
> > > + /* Panel needs big-endian order of brightness value */
> > > + u8 payload[2] = { brightness >> 8, brightness & 0xff };
> > > + int ret;
> > > +
> > > + ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_BRIGHTNESS,
> > > + payload, sizeof(payload));
> > > + if (ret < 0)
> > > + return ret;
> > > +
> > > + return 0;
> > > +}
> > > +
> > > +static const struct backlight_ops visionox_vtdr6130_bl_ops = {
> > > + .update_status = visionox_vtdr6130_bl_update_status,
> > > +};
> > > +
> > > +static struct backlight_device *
> > > +visionox_vtdr6130_create_backlight(struct mipi_dsi_device *dsi)
> > > +{
> > > + struct device *dev = &dsi->dev;
> > > + const struct backlight_properties props = {
> > > + .type = BACKLIGHT_RAW,
> > > + .brightness = 4095,
> > > + .max_brightness = 4095,
> > > + };
> > > +
> > > + return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
> > > + &visionox_vtdr6130_bl_ops, &props);
> > > +}
> > > +
> > > +static int visionox_vtdr6130_probe(struct mipi_dsi_device *dsi)
> > > +{
> > > + struct device *dev = &dsi->dev;
> > > + struct visionox_vtdr6130 *ctx;
> > > + int ret;
> > > +
> > > + ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
> > > + if (!ctx)
> > > + return -ENOMEM;
> > > +
> > > + ctx->supplies[0].supply = "vddio";
> > > + ctx->supplies[1].supply = "vci";
> > > + ctx->supplies[2].supply = "vdd";
> > > +
> > > + ret = devm_regulator_bulk_get(&dsi->dev, ARRAY_SIZE(ctx->supplies),
> > > + ctx->supplies);
> > > + if (ret < 0)
> > > + return ret;
> > > +
> > > + ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
> > > + if (IS_ERR(ctx->reset_gpio))
> > > + return dev_err_probe(dev, PTR_ERR(ctx->reset_gpio),
> > > + "Failed to get reset-gpios\n");
> > > +
> > > + ctx->dsi = dsi;
> > > + mipi_dsi_set_drvdata(dsi, ctx);
> > > +
> > > + dsi->lanes = 4;
> > > + dsi->format = MIPI_DSI_FMT_RGB888;
> > > + dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_NO_EOT_PACKET |
> > > + MIPI_DSI_CLOCK_NON_CONTINUOUS;
> > > +
> > > + drm_panel_init(&ctx->panel, dev, &visionox_vtdr6130_panel_funcs,
> > > + DRM_MODE_CONNECTOR_DSI);
> > > +
> > > + ctx->panel.backlight = visionox_vtdr6130_create_backlight(dsi);
> > > + if (IS_ERR(ctx->panel.backlight))
> > > + return dev_err_probe(dev, PTR_ERR(ctx->panel.backlight),
> > > + "Failed to create backlight\n");
> > > +
> > > + drm_panel_add(&ctx->panel);
> > > +
> > > + ret = mipi_dsi_attach(dsi);
> > > + if (ret < 0) {
> > > + dev_err(dev, "Failed to attach to DSI host: %d\n", ret);
> > > + drm_panel_remove(&ctx->panel);
> > > + return ret;
> > > + }
> > > +
> > > + return 0;
> > > +}
> > > +
> > > +static void visionox_vtdr6130_remove(struct mipi_dsi_device *dsi)
> > > +{
> > > + struct visionox_vtdr6130 *ctx = mipi_dsi_get_drvdata(dsi);
> > > + int ret;
> > > +
> > > + ret = mipi_dsi_detach(dsi);
> > > + if (ret < 0)
> > > + dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret);
> > > +
> > > + drm_panel_remove(&ctx->panel);
> > > +}
> > > +
> > > +static const struct of_device_id visionox_vtdr6130_of_match[] = {
> > > + { .compatible = "visionox,vtdr6130" },
> > > + { /* sentinel */ }
> > > +};
> > > +MODULE_DEVICE_TABLE(of, visionox_vtdr6130_of_match);
> > > +
> > > +static struct mipi_dsi_driver visionox_vtdr6130_driver = {
> > > + .probe = visionox_vtdr6130_probe,
> > > + .remove = visionox_vtdr6130_remove,
> > > + .driver = {
> > > + .name = "panel-visionox-vtdr6130",
> > > + .of_match_table = visionox_vtdr6130_of_match,
> > > + },
> > > +};
> > > +module_mipi_dsi_driver(visionox_vtdr6130_driver);
> > > +
> > > +MODULE_AUTHOR("Neil Armstrong <neil.armstrong@xxxxxxxxxx>");
> > > +MODULE_DESCRIPTION("Panel driver for the Visionox VTDR6130 AMOLED DSI panel");
> > > +MODULE_LICENSE("GPL");
> > >
> > > --
> > > 2.34.1
>

--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

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