| Message ID | 20240630-oneplus8-v2-6-c4a1f8da74f1@postmarketos.org (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | qcom: initial support for the OnePlus 8T | expand |
On Sun, Jun 30, 2024 at 08:36:29PM GMT, Caleb Connolly wrote: > This is a 1080x2400 120hz panel used on the OnePlus 8T. It uses DSC but > with many non-standard DCS commands. > > The only user of this panel (the OnePlus 8T) has a bug somewhere in the > DSI stack whereby it isn't possible to properly initialize this panel > after a reset. As a result, the reset GPIO is made optional so it can be > left unused on that device. > > Signed-off-by: Caleb Connolly <caleb@postmarketos.org> > --- > MAINTAINERS | 7 + > drivers/gpu/drm/panel/Kconfig | 9 + > drivers/gpu/drm/panel/Makefile | 1 + > drivers/gpu/drm/panel/panel-samsung-amb655x.c | 399 ++++++++++++++++++++++++++ > 4 files changed, 416 insertions(+) > > diff --git a/MAINTAINERS b/MAINTAINERS > index 807feae089c4..2b9cfbf92d7a 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -7142,8 +7142,15 @@ M: Robert Chiras <robert.chiras@nxp.com> > S: Maintained > F: Documentation/devicetree/bindings/display/panel/raydium,rm67191.yaml > F: drivers/gpu/drm/panel/panel-raydium-rm67191.c > > +DRM DRIVER FOR SAMSUNG AMB655X PANEL > +M: Caleb Connolly <caleb@postmarketos.org> > +S: Maintained > +T: git https://gitlab.freedesktop.org/drm/misc/kernel.git > +F: Documentation/devicetree/bindings/display/panel/samsung,amb655x.yaml > +F: drivers/gpu/drm/panel/panel-samsung-amb655x.c > + > DRM DRIVER FOR SAMSUNG DB7430 PANELS > M: Linus Walleij <linus.walleij@linaro.org> > S: Maintained > T: git https://gitlab.freedesktop.org/drm/misc/kernel.git > diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig > index bf4eadfe21cb..7203d16ab20a 100644 > --- a/drivers/gpu/drm/panel/Kconfig > +++ b/drivers/gpu/drm/panel/Kconfig > @@ -590,8 +590,17 @@ config DRM_PANEL_SAMSUNG_S6E88A0_AMS452EF01 > depends on OF > select DRM_MIPI_DSI > select VIDEOMODE_HELPERS > > +config DRM_PANEL_SAMSUNG_AMB655X > + tristate "Samsung AMB655X DSI panel" > + depends on OF > + depends on DRM_MIPI_DSI > + depends on BACKLIGHT_CLASS_DEVICE > + help > + DRM panel driver for the Samsung AMB655X panel. > + This panel has a resolution of 1080x2400 @ 60hz or 120Hz. > + > config DRM_PANEL_SAMSUNG_ATNA33XC20 > tristate "Samsung ATNA33XC20 eDP panel" > depends on OF > depends on BACKLIGHT_CLASS_DEVICE > diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile > index 051b75b3df7b..be6d500a56a4 100644 > --- a/drivers/gpu/drm/panel/Makefile > +++ b/drivers/gpu/drm/panel/Makefile > @@ -58,8 +58,9 @@ obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM67191) += panel-raydium-rm67191.o > obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM68200) += panel-raydium-rm68200.o > obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM692E5) += panel-raydium-rm692e5.o > obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM69380) += panel-raydium-rm69380.o > obj-$(CONFIG_DRM_PANEL_RONBO_RB070D30) += panel-ronbo-rb070d30.o > +obj-$(CONFIG_DRM_PANEL_SAMSUNG_AMB655X) += panel-samsung-amb655x.o > obj-$(CONFIG_DRM_PANEL_SAMSUNG_ATNA33XC20) += panel-samsung-atna33xc20.o > obj-$(CONFIG_DRM_PANEL_SAMSUNG_DB7430) += panel-samsung-db7430.o > obj-$(CONFIG_DRM_PANEL_SAMSUNG_LD9040) += panel-samsung-ld9040.o > obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6D16D0) += panel-samsung-s6d16d0.o > +static int samsung_amb655x_prepare(struct drm_panel *panel) > +{ > + struct samsung_amb655x *ctx = to_samsung_amb655x(panel); > + struct device *dev = &ctx->dsi->dev; > + int ret; > + > + /* > + * During the first call to prepare, the regulators are already enabled > + * since they're boot-on. Avoid enabling them twice so we keep the refcounts > + * balanced. I see your intent, but I don't think this is fully correct. If the driver gets rebound, then it will perform one extra disable call. On the next driver probe / enable / disable / remove cycle the driver will perform one more, underflowing enable count. I think regulator_init_complete_work_function should give the phone enough time to boot the panel. > + */ > + if (!regulator_is_enabled(ctx->supplies[0].consumer)) { > + ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies); > + if (ret) { > + dev_err(dev, "Failed to enable regulators: %d\n", ret); > + return ret; > + } > + } > +
On 01/07/2024 22:32, Dmitry Baryshkov wrote: > On Sun, Jun 30, 2024 at 08:36:29PM GMT, Caleb Connolly wrote: >> This is a 1080x2400 120hz panel used on the OnePlus 8T. It uses DSC but >> with many non-standard DCS commands. >> >> The only user of this panel (the OnePlus 8T) has a bug somewhere in the >> DSI stack whereby it isn't possible to properly initialize this panel >> after a reset. As a result, the reset GPIO is made optional so it can be >> left unused on that device. >> >> Signed-off-by: Caleb Connolly <caleb@postmarketos.org> >> --- >> MAINTAINERS | 7 + >> drivers/gpu/drm/panel/Kconfig | 9 + >> drivers/gpu/drm/panel/Makefile | 1 + >> drivers/gpu/drm/panel/panel-samsung-amb655x.c | 399 ++++++++++++++++++++++++++ >> 4 files changed, 416 insertions(+) >> >> diff --git a/MAINTAINERS b/MAINTAINERS >> index 807feae089c4..2b9cfbf92d7a 100644 >> --- a/MAINTAINERS >> +++ b/MAINTAINERS >> @@ -7142,8 +7142,15 @@ M: Robert Chiras <robert.chiras@nxp.com> >> S: Maintained >> F: Documentation/devicetree/bindings/display/panel/raydium,rm67191.yaml >> F: drivers/gpu/drm/panel/panel-raydium-rm67191.c >> >> +DRM DRIVER FOR SAMSUNG AMB655X PANEL >> +M: Caleb Connolly <caleb@postmarketos.org> >> +S: Maintained >> +T: git https://gitlab.freedesktop.org/drm/misc/kernel.git >> +F: Documentation/devicetree/bindings/display/panel/samsung,amb655x.yaml >> +F: drivers/gpu/drm/panel/panel-samsung-amb655x.c >> + >> DRM DRIVER FOR SAMSUNG DB7430 PANELS >> M: Linus Walleij <linus.walleij@linaro.org> >> S: Maintained >> T: git https://gitlab.freedesktop.org/drm/misc/kernel.git >> diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig >> index bf4eadfe21cb..7203d16ab20a 100644 >> --- a/drivers/gpu/drm/panel/Kconfig >> +++ b/drivers/gpu/drm/panel/Kconfig >> @@ -590,8 +590,17 @@ config DRM_PANEL_SAMSUNG_S6E88A0_AMS452EF01 >> depends on OF >> select DRM_MIPI_DSI >> select VIDEOMODE_HELPERS >> >> +config DRM_PANEL_SAMSUNG_AMB655X >> + tristate "Samsung AMB655X DSI panel" >> + depends on OF >> + depends on DRM_MIPI_DSI >> + depends on BACKLIGHT_CLASS_DEVICE >> + help >> + DRM panel driver for the Samsung AMB655X panel. >> + This panel has a resolution of 1080x2400 @ 60hz or 120Hz. >> + >> config DRM_PANEL_SAMSUNG_ATNA33XC20 >> tristate "Samsung ATNA33XC20 eDP panel" >> depends on OF >> depends on BACKLIGHT_CLASS_DEVICE >> diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile >> index 051b75b3df7b..be6d500a56a4 100644 >> --- a/drivers/gpu/drm/panel/Makefile >> +++ b/drivers/gpu/drm/panel/Makefile >> @@ -58,8 +58,9 @@ obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM67191) += panel-raydium-rm67191.o >> obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM68200) += panel-raydium-rm68200.o >> obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM692E5) += panel-raydium-rm692e5.o >> obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM69380) += panel-raydium-rm69380.o >> obj-$(CONFIG_DRM_PANEL_RONBO_RB070D30) += panel-ronbo-rb070d30.o >> +obj-$(CONFIG_DRM_PANEL_SAMSUNG_AMB655X) += panel-samsung-amb655x.o >> obj-$(CONFIG_DRM_PANEL_SAMSUNG_ATNA33XC20) += panel-samsung-atna33xc20.o >> obj-$(CONFIG_DRM_PANEL_SAMSUNG_DB7430) += panel-samsung-db7430.o >> obj-$(CONFIG_DRM_PANEL_SAMSUNG_LD9040) += panel-samsung-ld9040.o >> obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6D16D0) += panel-samsung-s6d16d0.o > > >> +static int samsung_amb655x_prepare(struct drm_panel *panel) >> +{ >> + struct samsung_amb655x *ctx = to_samsung_amb655x(panel); >> + struct device *dev = &ctx->dsi->dev; >> + int ret; >> + >> + /* >> + * During the first call to prepare, the regulators are already enabled >> + * since they're boot-on. Avoid enabling them twice so we keep the refcounts >> + * balanced. > > I see your intent, but I don't think this is fully correct. If the > driver gets rebound, then it will perform one extra disable call. On the > next driver probe / enable / disable / remove cycle the driver will > perform one more, underflowing enable count. I think > regulator_init_complete_work_function should give the phone enough time > to boot the panel. I do make an extra call to regulator_bulk_enable() in probe(), does that balance things out? > >> + */ >> + if (!regulator_is_enabled(ctx->supplies[0].consumer)) { >> + ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies); >> + if (ret) { >> + dev_err(dev, "Failed to enable regulators: %d\n", ret); >> + return ret; >> + } >> + } >> + >
On Tue, 2 Jul 2024 at 12:43, Caleb Connolly <caleb@postmarketos.org> wrote: > > > > On 01/07/2024 22:32, Dmitry Baryshkov wrote: > > On Sun, Jun 30, 2024 at 08:36:29PM GMT, Caleb Connolly wrote: > >> This is a 1080x2400 120hz panel used on the OnePlus 8T. It uses DSC but > >> with many non-standard DCS commands. > >> > >> The only user of this panel (the OnePlus 8T) has a bug somewhere in the > >> DSI stack whereby it isn't possible to properly initialize this panel > >> after a reset. As a result, the reset GPIO is made optional so it can be > >> left unused on that device. > >> > >> Signed-off-by: Caleb Connolly <caleb@postmarketos.org> > >> --- > >> MAINTAINERS | 7 + > >> drivers/gpu/drm/panel/Kconfig | 9 + > >> drivers/gpu/drm/panel/Makefile | 1 + > >> drivers/gpu/drm/panel/panel-samsung-amb655x.c | 399 ++++++++++++++++++++++++++ > >> 4 files changed, 416 insertions(+) > >> > >> diff --git a/MAINTAINERS b/MAINTAINERS > >> index 807feae089c4..2b9cfbf92d7a 100644 > >> --- a/MAINTAINERS > >> +++ b/MAINTAINERS > >> @@ -7142,8 +7142,15 @@ M: Robert Chiras <robert.chiras@nxp.com> > >> S: Maintained > >> F: Documentation/devicetree/bindings/display/panel/raydium,rm67191.yaml > >> F: drivers/gpu/drm/panel/panel-raydium-rm67191.c > >> > >> +DRM DRIVER FOR SAMSUNG AMB655X PANEL > >> +M: Caleb Connolly <caleb@postmarketos.org> > >> +S: Maintained > >> +T: git https://gitlab.freedesktop.org/drm/misc/kernel.git > >> +F: Documentation/devicetree/bindings/display/panel/samsung,amb655x.yaml > >> +F: drivers/gpu/drm/panel/panel-samsung-amb655x.c > >> + > >> DRM DRIVER FOR SAMSUNG DB7430 PANELS > >> M: Linus Walleij <linus.walleij@linaro.org> > >> S: Maintained > >> T: git https://gitlab.freedesktop.org/drm/misc/kernel.git > >> diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig > >> index bf4eadfe21cb..7203d16ab20a 100644 > >> --- a/drivers/gpu/drm/panel/Kconfig > >> +++ b/drivers/gpu/drm/panel/Kconfig > >> @@ -590,8 +590,17 @@ config DRM_PANEL_SAMSUNG_S6E88A0_AMS452EF01 > >> depends on OF > >> select DRM_MIPI_DSI > >> select VIDEOMODE_HELPERS > >> > >> +config DRM_PANEL_SAMSUNG_AMB655X > >> + tristate "Samsung AMB655X DSI panel" > >> + depends on OF > >> + depends on DRM_MIPI_DSI > >> + depends on BACKLIGHT_CLASS_DEVICE > >> + help > >> + DRM panel driver for the Samsung AMB655X panel. > >> + This panel has a resolution of 1080x2400 @ 60hz or 120Hz. > >> + > >> config DRM_PANEL_SAMSUNG_ATNA33XC20 > >> tristate "Samsung ATNA33XC20 eDP panel" > >> depends on OF > >> depends on BACKLIGHT_CLASS_DEVICE > >> diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile > >> index 051b75b3df7b..be6d500a56a4 100644 > >> --- a/drivers/gpu/drm/panel/Makefile > >> +++ b/drivers/gpu/drm/panel/Makefile > >> @@ -58,8 +58,9 @@ obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM67191) += panel-raydium-rm67191.o > >> obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM68200) += panel-raydium-rm68200.o > >> obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM692E5) += panel-raydium-rm692e5.o > >> obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM69380) += panel-raydium-rm69380.o > >> obj-$(CONFIG_DRM_PANEL_RONBO_RB070D30) += panel-ronbo-rb070d30.o > >> +obj-$(CONFIG_DRM_PANEL_SAMSUNG_AMB655X) += panel-samsung-amb655x.o > >> obj-$(CONFIG_DRM_PANEL_SAMSUNG_ATNA33XC20) += panel-samsung-atna33xc20.o > >> obj-$(CONFIG_DRM_PANEL_SAMSUNG_DB7430) += panel-samsung-db7430.o > >> obj-$(CONFIG_DRM_PANEL_SAMSUNG_LD9040) += panel-samsung-ld9040.o > >> obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6D16D0) += panel-samsung-s6d16d0.o > > > > > >> +static int samsung_amb655x_prepare(struct drm_panel *panel) > >> +{ > >> + struct samsung_amb655x *ctx = to_samsung_amb655x(panel); > >> + struct device *dev = &ctx->dsi->dev; > >> + int ret; > >> + > >> + /* > >> + * During the first call to prepare, the regulators are already enabled > >> + * since they're boot-on. Avoid enabling them twice so we keep the refcounts > >> + * balanced. > > > > I see your intent, but I don't think this is fully correct. If the > > driver gets rebound, then it will perform one extra disable call. On the > > next driver probe / enable / disable / remove cycle the driver will > > perform one more, underflowing enable count. I think > > regulator_init_complete_work_function should give the phone enough time > > to boot the panel. > > I do make an extra call to regulator_bulk_enable() in probe(), does that > balance things out? Hmm, I missed it. But if you have it, why not just have a single regulator_bulk_enable() in pre_enable() like everybody else does? > > > >> + */ > >> + if (!regulator_is_enabled(ctx->supplies[0].consumer)) { > >> + ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies); > >> + if (ret) { > >> + dev_err(dev, "Failed to enable regulators: %d\n", ret); > >> + return ret; > >> + } > >> + } > >> + > >
diff --git a/MAINTAINERS b/MAINTAINERS index 807feae089c4..2b9cfbf92d7a 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -7142,8 +7142,15 @@ M: Robert Chiras <robert.chiras@nxp.com> S: Maintained F: Documentation/devicetree/bindings/display/panel/raydium,rm67191.yaml F: drivers/gpu/drm/panel/panel-raydium-rm67191.c +DRM DRIVER FOR SAMSUNG AMB655X PANEL +M: Caleb Connolly <caleb@postmarketos.org> +S: Maintained +T: git https://gitlab.freedesktop.org/drm/misc/kernel.git +F: Documentation/devicetree/bindings/display/panel/samsung,amb655x.yaml +F: drivers/gpu/drm/panel/panel-samsung-amb655x.c + DRM DRIVER FOR SAMSUNG DB7430 PANELS M: Linus Walleij <linus.walleij@linaro.org> S: Maintained T: git https://gitlab.freedesktop.org/drm/misc/kernel.git diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig index bf4eadfe21cb..7203d16ab20a 100644 --- a/drivers/gpu/drm/panel/Kconfig +++ b/drivers/gpu/drm/panel/Kconfig @@ -590,8 +590,17 @@ config DRM_PANEL_SAMSUNG_S6E88A0_AMS452EF01 depends on OF select DRM_MIPI_DSI select VIDEOMODE_HELPERS +config DRM_PANEL_SAMSUNG_AMB655X + tristate "Samsung AMB655X DSI panel" + depends on OF + depends on DRM_MIPI_DSI + depends on BACKLIGHT_CLASS_DEVICE + help + DRM panel driver for the Samsung AMB655X panel. + This panel has a resolution of 1080x2400 @ 60hz or 120Hz. + config DRM_PANEL_SAMSUNG_ATNA33XC20 tristate "Samsung ATNA33XC20 eDP panel" depends on OF depends on BACKLIGHT_CLASS_DEVICE diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile index 051b75b3df7b..be6d500a56a4 100644 --- a/drivers/gpu/drm/panel/Makefile +++ b/drivers/gpu/drm/panel/Makefile @@ -58,8 +58,9 @@ obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM67191) += panel-raydium-rm67191.o obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM68200) += panel-raydium-rm68200.o obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM692E5) += panel-raydium-rm692e5.o obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM69380) += panel-raydium-rm69380.o obj-$(CONFIG_DRM_PANEL_RONBO_RB070D30) += panel-ronbo-rb070d30.o +obj-$(CONFIG_DRM_PANEL_SAMSUNG_AMB655X) += panel-samsung-amb655x.o obj-$(CONFIG_DRM_PANEL_SAMSUNG_ATNA33XC20) += panel-samsung-atna33xc20.o obj-$(CONFIG_DRM_PANEL_SAMSUNG_DB7430) += panel-samsung-db7430.o obj-$(CONFIG_DRM_PANEL_SAMSUNG_LD9040) += panel-samsung-ld9040.o obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6D16D0) += panel-samsung-s6d16d0.o diff --git a/drivers/gpu/drm/panel/panel-samsung-amb655x.c b/drivers/gpu/drm/panel/panel-samsung-amb655x.c new file mode 100644 index 000000000000..945346e84f68 --- /dev/null +++ b/drivers/gpu/drm/panel/panel-samsung-amb655x.c @@ -0,0 +1,399 @@ +// SPDX-License-Identifier: GPL-2.0-only +// Generated with linux-mdss-dsi-panel-driver-generator from vendor device tree: +// Copyright (c) 2015-2017, The Linux Foundation. All rights reserved. +// Copyright (c) 2024 Caleb Connolly <caleb@postmarketos.org> + + +#include <linux/backlight.h> +#include <linux/delay.h> +#include <linux/gpio/consumer.h> +#include <linux/module.h> +#include <linux/of.h> + +#include <video/mipi_display.h> + +#include <drm/display/drm_dsc.h> +#include <drm/display/drm_dsc_helper.h> +#include <drm/drm_mipi_dsi.h> +#include <drm/drm_modes.h> +#include <drm/drm_panel.h> + +struct samsung_amb655x { + struct drm_panel panel; + struct mipi_dsi_device *dsi; + struct drm_dsc_config dsc; + struct gpio_desc *reset_gpio; + struct regulator_bulk_data supplies[3]; +}; + +static inline +struct samsung_amb655x *to_samsung_amb655x(struct drm_panel *panel) +{ + return container_of(panel, struct samsung_amb655x, panel); +} + +static void samsung_amb655x_reset(struct samsung_amb655x *amb655x) +{ + gpiod_set_value_cansleep(amb655x->reset_gpio, 0); + usleep_range(10000, 11000); + gpiod_set_value_cansleep(amb655x->reset_gpio, 1); + usleep_range(1000, 2000); + gpiod_set_value_cansleep(amb655x->reset_gpio, 0); + usleep_range(10000, 11000); +} + +static int samsung_amb655x_on(struct samsung_amb655x *amb655x) +{ + struct drm_dsc_picture_parameter_set pps; + struct mipi_dsi_device *dsi = amb655x->dsi; + struct mipi_dsi_multi_context ctx = { .dsi = dsi }; + + dsi->mode_flags |= MIPI_DSI_MODE_LPM; + + drm_dsc_pps_payload_pack(&pps, &amb655x->dsc); + + mipi_dsi_dcs_write_long_multi(&ctx, 0xf0, 0x5a, 0x5a); + mipi_dsi_dcs_write_buffer_multi(&ctx, &pps, sizeof(pps)); + mipi_dsi_dcs_write_long_multi(&ctx, 0x9d, 0x01); + mipi_dsi_dcs_write_long_multi(&ctx, 0xf0, 0xa5, 0xa5); + + mipi_dsi_dcs_exit_sleep_mode_multi(&ctx); + mipi_dsi_msleep(&ctx, 11); + + /* VLIN CURRENT LIMIT */ + mipi_dsi_dcs_write_long_multi(&ctx, 0xf0, 0x5a, 0x5a); + mipi_dsi_dcs_write_long_multi(&ctx, 0xb0, 0x04); + mipi_dsi_dcs_write_long_multi(&ctx, 0xd5, 0x24, 0x9e, 0x9e, 0x00, 0x20); + mipi_dsi_dcs_write_long_multi(&ctx, 0xf0, 0xa5, 0xa5); + + /* OSC Select */ + mipi_dsi_dcs_write_long_multi(&ctx, 0xf0, 0x5a, 0x5a); + mipi_dsi_dcs_write_long_multi(&ctx, 0xfc, 0x5a, 0x5a); + mipi_dsi_dcs_write_long_multi(&ctx, 0xb0, 0x16); + mipi_dsi_dcs_write_long_multi(&ctx, 0xd1, 0x22); + mipi_dsi_dcs_write_long_multi(&ctx, 0xd6, 0x11); + mipi_dsi_dcs_write_long_multi(&ctx, 0xfc, 0xa5, 0xa5); + mipi_dsi_dcs_write_long_multi(&ctx, 0xf0, 0xa5, 0xa5); + + /* TE ON */ + mipi_dsi_dcs_write_long_multi(&ctx, 0xf0, 0x5a, 0x5a); + mipi_dsi_dcs_write_long_multi(&ctx, MIPI_DCS_SET_TEAR_ON, MIPI_DSI_DCS_TEAR_MODE_VBLANK); + mipi_dsi_dcs_write_long_multi(&ctx, 0xf0, 0xa5, 0xa5); + + /* TSP Setting */ + mipi_dsi_dcs_write_long_multi(&ctx, 0xf0, 0x5a, 0x5a); + mipi_dsi_dcs_write_long_multi(&ctx, 0xdf, 0x83, 0x00, 0x10); + mipi_dsi_dcs_write_long_multi(&ctx, 0xb0, 0x01); + mipi_dsi_dcs_write_long_multi(&ctx, 0xe6, 0x01); + mipi_dsi_dcs_write_long_multi(&ctx, 0xf0, 0xa5, 0xa5); + + mipi_dsi_dcs_set_column_address_multi(&ctx, 0x0000, 1080 - 1); + mipi_dsi_dcs_set_page_address_multi(&ctx, 0x0000, 2400 - 1); + + /* FD Setting */ + mipi_dsi_dcs_write_long_multi(&ctx, 0xf0, 0x5a, 0x5a); + mipi_dsi_dcs_write_long_multi(&ctx, 0xd5, 0x8d); + mipi_dsi_dcs_write_long_multi(&ctx, 0xb0, 0x0a); + mipi_dsi_dcs_write_long_multi(&ctx, 0xd5, 0x05); + mipi_dsi_dcs_write_long_multi(&ctx, 0xf0, 0xa5, 0xa5); + + /* FFC Function */ + mipi_dsi_dcs_write_long_multi(&ctx, 0xfc, 0x5a, 0x5a); + mipi_dsi_dcs_write_long_multi(&ctx, 0xb0, 0x01); + mipi_dsi_dcs_write_long_multi(&ctx, 0xe4, 0xa6, 0x75, 0xa3); + mipi_dsi_dcs_write_long_multi(&ctx, 0xe9, + 0x11, 0x75, 0xa6, 0x75, + 0xa3, 0x4b, 0x17, 0xac, + 0x4b, 0x17, 0xac, 0x00, + 0x19, 0x19); + mipi_dsi_dcs_write_long_multi(&ctx, 0xfc, 0xa5, 0xa5); + mipi_dsi_msleep(&ctx, 61); + + /* Dimming Setting */ + mipi_dsi_dcs_write_long_multi(&ctx, 0xf0, 0x5a, 0x5a); + mipi_dsi_dcs_write_long_multi(&ctx, 0xb0, 0x06); + mipi_dsi_dcs_write_long_multi(&ctx, 0xb7, 0x01); + mipi_dsi_dcs_write_long_multi(&ctx, 0xb0, 0x05); + mipi_dsi_dcs_write_long_multi(&ctx, 0xb7, 0x13); + mipi_dsi_dcs_write_long_multi(&ctx, 0xb0, 0x01); + mipi_dsi_dcs_write_long_multi(&ctx, 0xb7, 0x4c); + mipi_dsi_dcs_write_long_multi(&ctx, 0xf0, 0xa5, 0xa5); + + mipi_dsi_dcs_write_long_multi(&ctx, MIPI_DCS_WRITE_CONTROL_DISPLAY, 0x20); + + /* refresh rate Transition */ + mipi_dsi_dcs_write_long_multi(&ctx, 0xf0, 0x5a, 0x5a); + /* 60 Hz */ + //mipi_dsi_dcs_write_long_multi(&ctx, 0x60, 0x00); + /* 120 Hz */ + mipi_dsi_dcs_write_long_multi(&ctx, 0x60, 0x10); + + mipi_dsi_dcs_write_long_multi(&ctx, 0xf0, 0xa5, 0xa5); + + /* ACL Mode */ + mipi_dsi_dcs_write_long_multi(&ctx, 0xf0, 0x5a, 0x5a); + mipi_dsi_dcs_write_long_multi(&ctx, MIPI_DCS_WRITE_POWER_SAVE, 0x00); + mipi_dsi_dcs_write_long_multi(&ctx, 0xf0, 0xa5, 0xa5); + mipi_dsi_dcs_write_seq_multi(&ctx, MIPI_DCS_WRITE_CONTROL_DISPLAY, 0x20); + mipi_dsi_msleep(&ctx, 110); + + mipi_dsi_dcs_write_long_multi(&ctx, 0x9F, 0x5A, 0x5A); + mipi_dsi_dcs_set_display_on_multi(&ctx); + mipi_dsi_dcs_write_seq_multi(&ctx, MIPI_DCS_ENTER_NORMAL_MODE); + mipi_dsi_dcs_write_long_multi(&ctx, 0x9F, 0xA5, 0xA5); + + return ctx.accum_err; +} + +static int samsung_amb655x_off(struct samsung_amb655x *amb655x) +{ + struct mipi_dsi_device *dsi = amb655x->dsi; + struct mipi_dsi_multi_context ctx = { .dsi = dsi }; + + dsi->mode_flags |= MIPI_DSI_MODE_LPM; + + mipi_dsi_dcs_write_long_multi(&ctx, 0x9f, 0x5a, 0x5a); + + mipi_dsi_dcs_set_display_on_multi(&ctx); + mipi_dsi_msleep(&ctx, 20); + + mipi_dsi_dcs_set_display_off_multi(&ctx); + mipi_dsi_msleep(&ctx, 20); + + mipi_dsi_dcs_enter_sleep_mode_multi(&ctx); + mipi_dsi_dcs_write_long_multi(&ctx, 0x9f, 0xa5, 0xa5); + + mipi_dsi_msleep(&ctx, 150); + + return ctx.accum_err; +} + +static int samsung_amb655x_prepare(struct drm_panel *panel) +{ + struct samsung_amb655x *ctx = to_samsung_amb655x(panel); + struct device *dev = &ctx->dsi->dev; + int ret; + + /* + * During the first call to prepare, the regulators are already enabled + * since they're boot-on. Avoid enabling them twice so we keep the refcounts + * balanced. + */ + if (!regulator_is_enabled(ctx->supplies[0].consumer)) { + ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies); + if (ret) { + dev_err(dev, "Failed to enable regulators: %d\n", ret); + return ret; + } + } + + samsung_amb655x_reset(ctx); + + ret = samsung_amb655x_on(ctx); + if (ret < 0) { + dev_err(dev, "Failed to initialize panel: %d\n", ret); + gpiod_set_value_cansleep(ctx->reset_gpio, 1); + return ret; + } + + msleep(28); + + return 0; +} + +static int samsung_amb655x_unprepare(struct drm_panel *panel) +{ + struct samsung_amb655x *amb655x = to_samsung_amb655x(panel); + struct device *dev = &amb655x->dsi->dev; + int ret; + + ret = samsung_amb655x_off(amb655x); + if (ret < 0) + dev_err(dev, "Failed to un-initialize panel: %d\n", ret); + + gpiod_set_value_cansleep(amb655x->reset_gpio, 1); + + ret = regulator_bulk_disable(ARRAY_SIZE(amb655x->supplies), amb655x->supplies); + if (ret) { + dev_err(dev, "Failed to enable regulators: %d\n", ret); + return ret; + } + + return 0; +} + +static const struct drm_display_mode samsung_amb655x_120_mode = { + .clock = (1080 + 52 + 24 + 24) * (2400 + 4 + 4 + 8) * 120 / 1000, + .hdisplay = 1080, + .hsync_start = 1080 + 52, + .hsync_end = 1080 + 52 + 24, + .htotal = 1080 + 52 + 24 + 24, + .vdisplay = 2400, + .vsync_start = 2400 + 4, + .vsync_end = 2400 + 4 + 4, + .vtotal = 2400 + 4 + 4 + 8, + .width_mm = 70, + .height_mm = 151, +}; + +static int samsung_amb655x_get_modes(struct drm_panel *panel, + struct drm_connector *connector) +{ + struct drm_display_mode *mode; + + mode = drm_mode_duplicate(connector->dev, &samsung_amb655x_120_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 samsung_amb655x_panel_funcs = { + .prepare = samsung_amb655x_prepare, + .unprepare = samsung_amb655x_unprepare, + .get_modes = samsung_amb655x_get_modes, +}; + +static int samsung_amb655x_bl_update_status(struct backlight_device *bl) +{ + struct mipi_dsi_device *dsi = bl_get_data(bl); + u16 brightness = backlight_get_brightness(bl); + int ret; + + ret = mipi_dsi_dcs_set_display_brightness_large(dsi, brightness); + if (ret < 0) + return ret; + + return 0; +} + +static const struct backlight_ops samsung_amb655x_bl_ops = { + .update_status = samsung_amb655x_bl_update_status, +}; + +static struct backlight_device * +samsung_amb655x_create_backlight(struct mipi_dsi_device *dsi) +{ + struct device *dev = &dsi->dev; + const struct backlight_properties props = { + .type = BACKLIGHT_RAW, + .brightness = 2047, + .max_brightness = 2047, + }; + + return devm_backlight_device_register(dev, dev_name(dev), dev, dsi, + &samsung_amb655x_bl_ops, &props); +} + +static int samsung_amb655x_probe(struct mipi_dsi_device *dsi) +{ + struct device *dev = &dsi->dev; + struct samsung_amb655x *ctx; + int ret; + + ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL); + if (!ctx) + return -ENOMEM; + + ctx->supplies[0].supply = "vddio"; + ctx->supplies[1].supply = "vdd"; + ctx->supplies[2].supply = "avdd"; + + ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies), ctx->supplies); + if (ret) + return dev_err_probe(dev, ret, + "Failed to get vddio regulator\n"); + + ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies); + if (ret) + dev_err(dev, "Failed to enable regulators: %d\n", ret); + + ctx->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH); + 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; + + drm_panel_init(&ctx->panel, dev, &samsung_amb655x_panel_funcs, + DRM_MODE_CONNECTOR_DSI); + ctx->panel.prepare_prev_first = true; + + ctx->panel.backlight = samsung_amb655x_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); + + /* This panel only supports DSC; unconditionally enable it */ + dsi->dsc = &ctx->dsc; + + ctx->dsc.dsc_version_major = 1; + ctx->dsc.dsc_version_minor = 1; + + /* TODO: Pass slice_per_pkt = 2 */ + ctx->dsc.slice_height = 30; + ctx->dsc.slice_width = 540; + /* + * TODO: hdisplay should be read from the selected mode once + * it is passed back to drm_panel (in prepare?) + */ + WARN_ON(1080 % ctx->dsc.slice_width); + ctx->dsc.slice_count = 1080 / ctx->dsc.slice_width; + ctx->dsc.bits_per_component = 8; + ctx->dsc.bits_per_pixel = 8 << 4; /* 4 fractional bits */ + ctx->dsc.block_pred_enable = true; + + 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 samsung_amb655x_remove(struct mipi_dsi_device *dsi) +{ + struct samsung_amb655x *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 samsung_amb655x_of_match[] = { + { .compatible = "samsung,amb655x" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, samsung_amb655x_of_match); + +static struct mipi_dsi_driver samsung_amb655x_driver = { + .probe = samsung_amb655x_probe, + .remove = samsung_amb655x_remove, + .driver = { + .name = "panel-samsung-amb655x", + .of_match_table = samsung_amb655x_of_match, + }, +}; +module_mipi_dsi_driver(samsung_amb655x_driver); + +MODULE_AUTHOR("Caleb Connolly <caleb@postmarketos.org>"); +MODULE_DESCRIPTION("DRM driver for Samsung AMB655X DSC DSI panel"); +MODULE_LICENSE("GPL");
This is a 1080x2400 120hz panel used on the OnePlus 8T. It uses DSC but with many non-standard DCS commands. The only user of this panel (the OnePlus 8T) has a bug somewhere in the DSI stack whereby it isn't possible to properly initialize this panel after a reset. As a result, the reset GPIO is made optional so it can be left unused on that device. Signed-off-by: Caleb Connolly <caleb@postmarketos.org> --- MAINTAINERS | 7 + drivers/gpu/drm/panel/Kconfig | 9 + drivers/gpu/drm/panel/Makefile | 1 + drivers/gpu/drm/panel/panel-samsung-amb655x.c | 399 ++++++++++++++++++++++++++ 4 files changed, 416 insertions(+)