| Message ID | 20200924083145.23312-1-m.szyprowski@samsung.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | drm/bridge: tc358764: restore connector support | expand |
W dniu 24.09.2020 o 10:31, Marek Szyprowski pisze: > This patch restores DRM connector registration in the TC358764 bridge > driver and restores usage of the old drm_panel_* API, thus allows dynamic > panel registration. This fixes panel operation on Exynos5250-based > Arndale board. > > This is equivalent to the revert of the following commits: > 1644127f83bc "drm/bridge: tc358764: add drm_panel_bridge support" > 385ca38da29c "drm/bridge: tc358764: drop drm_connector_(un)register" > and removal of the calls to drm_panel_attach()/drm_panel_detach(), which > were no-ops and has been removed in meanwhile. > > Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Reviewed-by: Andrzej Hajda <a.hajda@samsung.com> Regards Andrzej > --- > As I've reported and Andrzej Hajda pointed, the reverted patches break > operation of the panel on the Arndale board. Noone suggested how to fix > the regression, I've decided to send a revert until a new solution is > found. > > The issues with tc358764 might be automatically resolved once the Exynos > DSI itself is converted to DRM bridge: > https://patchwork.kernel.org/cover/11770683/ > but that approach has also its own issues so far. > > Best regards, > Marek Szyprowski > --- > drivers/gpu/drm/bridge/tc358764.c | 107 +++++++++++++++++++++++++----- > 1 file changed, 92 insertions(+), 15 deletions(-) > > diff --git a/drivers/gpu/drm/bridge/tc358764.c b/drivers/gpu/drm/bridge/tc358764.c > index d89394bc5aa4..c1e35bdf9232 100644 > --- a/drivers/gpu/drm/bridge/tc358764.c > +++ b/drivers/gpu/drm/bridge/tc358764.c > @@ -153,9 +153,10 @@ static const char * const tc358764_supplies[] = { > struct tc358764 { > struct device *dev; > struct drm_bridge bridge; > + struct drm_connector connector; > struct regulator_bulk_data supplies[ARRAY_SIZE(tc358764_supplies)]; > struct gpio_desc *gpio_reset; > - struct drm_bridge *panel_bridge; > + struct drm_panel *panel; > int error; > }; > > @@ -209,6 +210,12 @@ static inline struct tc358764 *bridge_to_tc358764(struct drm_bridge *bridge) > return container_of(bridge, struct tc358764, bridge); > } > > +static inline > +struct tc358764 *connector_to_tc358764(struct drm_connector *connector) > +{ > + return container_of(connector, struct tc358764, connector); > +} > + > static int tc358764_init(struct tc358764 *ctx) > { > u32 v = 0; > @@ -271,11 +278,43 @@ static void tc358764_reset(struct tc358764 *ctx) > usleep_range(1000, 2000); > } > > +static int tc358764_get_modes(struct drm_connector *connector) > +{ > + struct tc358764 *ctx = connector_to_tc358764(connector); > + > + return drm_panel_get_modes(ctx->panel, connector); > +} > + > +static const > +struct drm_connector_helper_funcs tc358764_connector_helper_funcs = { > + .get_modes = tc358764_get_modes, > +}; > + > +static const struct drm_connector_funcs tc358764_connector_funcs = { > + .fill_modes = drm_helper_probe_single_connector_modes, > + .destroy = drm_connector_cleanup, > + .reset = drm_atomic_helper_connector_reset, > + .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, > + .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, > +}; > + > +static void tc358764_disable(struct drm_bridge *bridge) > +{ > + struct tc358764 *ctx = bridge_to_tc358764(bridge); > + int ret = drm_panel_disable(bridge_to_tc358764(bridge)->panel); > + > + if (ret < 0) > + dev_err(ctx->dev, "error disabling panel (%d)\n", ret); > +} > + > static void tc358764_post_disable(struct drm_bridge *bridge) > { > struct tc358764 *ctx = bridge_to_tc358764(bridge); > int ret; > > + ret = drm_panel_unprepare(ctx->panel); > + if (ret < 0) > + dev_err(ctx->dev, "error unpreparing panel (%d)\n", ret); > tc358764_reset(ctx); > usleep_range(10000, 15000); > ret = regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies); > @@ -296,28 +335,71 @@ static void tc358764_pre_enable(struct drm_bridge *bridge) > ret = tc358764_init(ctx); > if (ret < 0) > dev_err(ctx->dev, "error initializing bridge (%d)\n", ret); > + ret = drm_panel_prepare(ctx->panel); > + if (ret < 0) > + dev_err(ctx->dev, "error preparing panel (%d)\n", ret); > +} > + > +static void tc358764_enable(struct drm_bridge *bridge) > +{ > + struct tc358764 *ctx = bridge_to_tc358764(bridge); > + int ret = drm_panel_enable(ctx->panel); > + > + if (ret < 0) > + dev_err(ctx->dev, "error enabling panel (%d)\n", ret); > } > > static int tc358764_attach(struct drm_bridge *bridge, > enum drm_bridge_attach_flags flags) > +{ > + struct tc358764 *ctx = bridge_to_tc358764(bridge); > + struct drm_device *drm = bridge->dev; > + int ret; > + > + if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) { > + DRM_ERROR("Fix bridge driver to make connector optional!"); > + return -EINVAL; > + } > + > + ctx->connector.polled = DRM_CONNECTOR_POLL_HPD; > + ret = drm_connector_init(drm, &ctx->connector, > + &tc358764_connector_funcs, > + DRM_MODE_CONNECTOR_LVDS); > + if (ret) { > + DRM_ERROR("Failed to initialize connector\n"); > + return ret; > + } > + > + drm_connector_helper_add(&ctx->connector, > + &tc358764_connector_helper_funcs); > + drm_connector_attach_encoder(&ctx->connector, bridge->encoder); > + ctx->connector.funcs->reset(&ctx->connector); > + drm_connector_register(&ctx->connector); > + > + return 0; > +} > + > +static void tc358764_detach(struct drm_bridge *bridge) > { > struct tc358764 *ctx = bridge_to_tc358764(bridge); > > - return drm_bridge_attach(bridge->encoder, ctx->panel_bridge, > - bridge, flags); > + drm_connector_unregister(&ctx->connector); > + ctx->panel = NULL; > + drm_connector_put(&ctx->connector); > } > > static const struct drm_bridge_funcs tc358764_bridge_funcs = { > + .disable = tc358764_disable, > .post_disable = tc358764_post_disable, > + .enable = tc358764_enable, > .pre_enable = tc358764_pre_enable, > .attach = tc358764_attach, > + .detach = tc358764_detach, > }; > > static int tc358764_parse_dt(struct tc358764 *ctx) > { > - struct drm_bridge *panel_bridge; > struct device *dev = ctx->dev; > - struct drm_panel *panel; > int ret; > > ctx->gpio_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW); > @@ -326,16 +408,12 @@ static int tc358764_parse_dt(struct tc358764 *ctx) > return PTR_ERR(ctx->gpio_reset); > } > > - ret = drm_of_find_panel_or_bridge(dev->of_node, 1, 0, &panel, NULL); > - if (ret) > - return ret; > - > - panel_bridge = devm_drm_panel_bridge_add(dev, panel); > - if (IS_ERR(panel_bridge)) > - return PTR_ERR(panel_bridge); > + ret = drm_of_find_panel_or_bridge(ctx->dev->of_node, 1, 0, &ctx->panel, > + NULL); > + if (ret && ret != -EPROBE_DEFER) > + dev_err(dev, "cannot find panel (%d)\n", ret); > > - ctx->panel_bridge = panel_bridge; > - return 0; > + return ret; > } > > static int tc358764_configure_regulators(struct tc358764 *ctx) > @@ -381,7 +459,6 @@ static int tc358764_probe(struct mipi_dsi_device *dsi) > return ret; > > ctx->bridge.funcs = &tc358764_bridge_funcs; > - ctx->bridge.type = DRM_MODE_CONNECTOR_LVDS; > ctx->bridge.of_node = dev->of_node; > > drm_bridge_add(&ctx->bridge);
On Wed, Sep 30, 2020 at 12:13 PM Andrzej Hajda <a.hajda@samsung.com> wrote: > > > W dniu 24.09.2020 o 10:31, Marek Szyprowski pisze: > > This patch restores DRM connector registration in the TC358764 bridge > > driver and restores usage of the old drm_panel_* API, thus allows dynamic > > panel registration. This fixes panel operation on Exynos5250-based > > Arndale board. > > > > This is equivalent to the revert of the following commits: > > 1644127f83bc "drm/bridge: tc358764: add drm_panel_bridge support" > > 385ca38da29c "drm/bridge: tc358764: drop drm_connector_(un)register" > > and removal of the calls to drm_panel_attach()/drm_panel_detach(), which > > were no-ops and has been removed in meanwhile. > > > > Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> > Reviewed-by: Andrzej Hajda <a.hajda@samsung.com> > > Regards > Andrzej > > --- > > As I've reported and Andrzej Hajda pointed, the reverted patches break > > operation of the panel on the Arndale board. Noone suggested how to fix > > the regression, I've decided to send a revert until a new solution is > > found. > > > > The issues with tc358764 might be automatically resolved once the Exynos > > DSI itself is converted to DRM bridge: > > https://patchwork.kernel.org/cover/11770683/ > > but that approach has also its own issues so far. I'm ok with the revert to fix the regression, but I'd kinda like to see a bit more than "maybe we fix this in the future". Otherwise this nice idea of having a common drm_bridge abstraction is just leading towards a complete disaster where every combination of bridge/driver works slightly differently. And we're half-way there in that mess already I think. Cheers, Daniel > > > > Best regards, > > Marek Szyprowski > > --- > > drivers/gpu/drm/bridge/tc358764.c | 107 +++++++++++++++++++++++++----- > > 1 file changed, 92 insertions(+), 15 deletions(-) > > > > diff --git a/drivers/gpu/drm/bridge/tc358764.c b/drivers/gpu/drm/bridge/tc358764.c > > index d89394bc5aa4..c1e35bdf9232 100644 > > --- a/drivers/gpu/drm/bridge/tc358764.c > > +++ b/drivers/gpu/drm/bridge/tc358764.c > > @@ -153,9 +153,10 @@ static const char * const tc358764_supplies[] = { > > struct tc358764 { > > struct device *dev; > > struct drm_bridge bridge; > > + struct drm_connector connector; > > struct regulator_bulk_data supplies[ARRAY_SIZE(tc358764_supplies)]; > > struct gpio_desc *gpio_reset; > > - struct drm_bridge *panel_bridge; > > + struct drm_panel *panel; > > int error; > > }; > > > > @@ -209,6 +210,12 @@ static inline struct tc358764 *bridge_to_tc358764(struct drm_bridge *bridge) > > return container_of(bridge, struct tc358764, bridge); > > } > > > > +static inline > > +struct tc358764 *connector_to_tc358764(struct drm_connector *connector) > > +{ > > + return container_of(connector, struct tc358764, connector); > > +} > > + > > static int tc358764_init(struct tc358764 *ctx) > > { > > u32 v = 0; > > @@ -271,11 +278,43 @@ static void tc358764_reset(struct tc358764 *ctx) > > usleep_range(1000, 2000); > > } > > > > +static int tc358764_get_modes(struct drm_connector *connector) > > +{ > > + struct tc358764 *ctx = connector_to_tc358764(connector); > > + > > + return drm_panel_get_modes(ctx->panel, connector); > > +} > > + > > +static const > > +struct drm_connector_helper_funcs tc358764_connector_helper_funcs = { > > + .get_modes = tc358764_get_modes, > > +}; > > + > > +static const struct drm_connector_funcs tc358764_connector_funcs = { > > + .fill_modes = drm_helper_probe_single_connector_modes, > > + .destroy = drm_connector_cleanup, > > + .reset = drm_atomic_helper_connector_reset, > > + .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, > > + .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, > > +}; > > + > > +static void tc358764_disable(struct drm_bridge *bridge) > > +{ > > + struct tc358764 *ctx = bridge_to_tc358764(bridge); > > + int ret = drm_panel_disable(bridge_to_tc358764(bridge)->panel); > > + > > + if (ret < 0) > > + dev_err(ctx->dev, "error disabling panel (%d)\n", ret); > > +} > > + > > static void tc358764_post_disable(struct drm_bridge *bridge) > > { > > struct tc358764 *ctx = bridge_to_tc358764(bridge); > > int ret; > > > > + ret = drm_panel_unprepare(ctx->panel); > > + if (ret < 0) > > + dev_err(ctx->dev, "error unpreparing panel (%d)\n", ret); > > tc358764_reset(ctx); > > usleep_range(10000, 15000); > > ret = regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies); > > @@ -296,28 +335,71 @@ static void tc358764_pre_enable(struct drm_bridge *bridge) > > ret = tc358764_init(ctx); > > if (ret < 0) > > dev_err(ctx->dev, "error initializing bridge (%d)\n", ret); > > + ret = drm_panel_prepare(ctx->panel); > > + if (ret < 0) > > + dev_err(ctx->dev, "error preparing panel (%d)\n", ret); > > +} > > + > > +static void tc358764_enable(struct drm_bridge *bridge) > > +{ > > + struct tc358764 *ctx = bridge_to_tc358764(bridge); > > + int ret = drm_panel_enable(ctx->panel); > > + > > + if (ret < 0) > > + dev_err(ctx->dev, "error enabling panel (%d)\n", ret); > > } > > > > static int tc358764_attach(struct drm_bridge *bridge, > > enum drm_bridge_attach_flags flags) > > +{ > > + struct tc358764 *ctx = bridge_to_tc358764(bridge); > > + struct drm_device *drm = bridge->dev; > > + int ret; > > + > > + if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) { > > + DRM_ERROR("Fix bridge driver to make connector optional!"); > > + return -EINVAL; > > + } > > + > > + ctx->connector.polled = DRM_CONNECTOR_POLL_HPD; > > + ret = drm_connector_init(drm, &ctx->connector, > > + &tc358764_connector_funcs, > > + DRM_MODE_CONNECTOR_LVDS); > > + if (ret) { > > + DRM_ERROR("Failed to initialize connector\n"); > > + return ret; > > + } > > + > > + drm_connector_helper_add(&ctx->connector, > > + &tc358764_connector_helper_funcs); > > + drm_connector_attach_encoder(&ctx->connector, bridge->encoder); > > + ctx->connector.funcs->reset(&ctx->connector); > > + drm_connector_register(&ctx->connector); > > + > > + return 0; > > +} > > + > > +static void tc358764_detach(struct drm_bridge *bridge) > > { > > struct tc358764 *ctx = bridge_to_tc358764(bridge); > > > > - return drm_bridge_attach(bridge->encoder, ctx->panel_bridge, > > - bridge, flags); > > + drm_connector_unregister(&ctx->connector); > > + ctx->panel = NULL; > > + drm_connector_put(&ctx->connector); > > } > > > > static const struct drm_bridge_funcs tc358764_bridge_funcs = { > > + .disable = tc358764_disable, > > .post_disable = tc358764_post_disable, > > + .enable = tc358764_enable, > > .pre_enable = tc358764_pre_enable, > > .attach = tc358764_attach, > > + .detach = tc358764_detach, > > }; > > > > static int tc358764_parse_dt(struct tc358764 *ctx) > > { > > - struct drm_bridge *panel_bridge; > > struct device *dev = ctx->dev; > > - struct drm_panel *panel; > > int ret; > > > > ctx->gpio_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW); > > @@ -326,16 +408,12 @@ static int tc358764_parse_dt(struct tc358764 *ctx) > > return PTR_ERR(ctx->gpio_reset); > > } > > > > - ret = drm_of_find_panel_or_bridge(dev->of_node, 1, 0, &panel, NULL); > > - if (ret) > > - return ret; > > - > > - panel_bridge = devm_drm_panel_bridge_add(dev, panel); > > - if (IS_ERR(panel_bridge)) > > - return PTR_ERR(panel_bridge); > > + ret = drm_of_find_panel_or_bridge(ctx->dev->of_node, 1, 0, &ctx->panel, > > + NULL); > > + if (ret && ret != -EPROBE_DEFER) > > + dev_err(dev, "cannot find panel (%d)\n", ret); > > > > - ctx->panel_bridge = panel_bridge; > > - return 0; > > + return ret; > > } > > > > static int tc358764_configure_regulators(struct tc358764 *ctx) > > @@ -381,7 +459,6 @@ static int tc358764_probe(struct mipi_dsi_device *dsi) > > return ret; > > > > ctx->bridge.funcs = &tc358764_bridge_funcs; > > - ctx->bridge.type = DRM_MODE_CONNECTOR_LVDS; > > ctx->bridge.of_node = dev->of_node; > > > > drm_bridge_add(&ctx->bridge); > _______________________________________________ > dri-devel mailing list > dri-devel@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/dri-devel
diff --git a/drivers/gpu/drm/bridge/tc358764.c b/drivers/gpu/drm/bridge/tc358764.c index d89394bc5aa4..c1e35bdf9232 100644 --- a/drivers/gpu/drm/bridge/tc358764.c +++ b/drivers/gpu/drm/bridge/tc358764.c @@ -153,9 +153,10 @@ static const char * const tc358764_supplies[] = { struct tc358764 { struct device *dev; struct drm_bridge bridge; + struct drm_connector connector; struct regulator_bulk_data supplies[ARRAY_SIZE(tc358764_supplies)]; struct gpio_desc *gpio_reset; - struct drm_bridge *panel_bridge; + struct drm_panel *panel; int error; }; @@ -209,6 +210,12 @@ static inline struct tc358764 *bridge_to_tc358764(struct drm_bridge *bridge) return container_of(bridge, struct tc358764, bridge); } +static inline +struct tc358764 *connector_to_tc358764(struct drm_connector *connector) +{ + return container_of(connector, struct tc358764, connector); +} + static int tc358764_init(struct tc358764 *ctx) { u32 v = 0; @@ -271,11 +278,43 @@ static void tc358764_reset(struct tc358764 *ctx) usleep_range(1000, 2000); } +static int tc358764_get_modes(struct drm_connector *connector) +{ + struct tc358764 *ctx = connector_to_tc358764(connector); + + return drm_panel_get_modes(ctx->panel, connector); +} + +static const +struct drm_connector_helper_funcs tc358764_connector_helper_funcs = { + .get_modes = tc358764_get_modes, +}; + +static const struct drm_connector_funcs tc358764_connector_funcs = { + .fill_modes = drm_helper_probe_single_connector_modes, + .destroy = drm_connector_cleanup, + .reset = drm_atomic_helper_connector_reset, + .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, + .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, +}; + +static void tc358764_disable(struct drm_bridge *bridge) +{ + struct tc358764 *ctx = bridge_to_tc358764(bridge); + int ret = drm_panel_disable(bridge_to_tc358764(bridge)->panel); + + if (ret < 0) + dev_err(ctx->dev, "error disabling panel (%d)\n", ret); +} + static void tc358764_post_disable(struct drm_bridge *bridge) { struct tc358764 *ctx = bridge_to_tc358764(bridge); int ret; + ret = drm_panel_unprepare(ctx->panel); + if (ret < 0) + dev_err(ctx->dev, "error unpreparing panel (%d)\n", ret); tc358764_reset(ctx); usleep_range(10000, 15000); ret = regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies); @@ -296,28 +335,71 @@ static void tc358764_pre_enable(struct drm_bridge *bridge) ret = tc358764_init(ctx); if (ret < 0) dev_err(ctx->dev, "error initializing bridge (%d)\n", ret); + ret = drm_panel_prepare(ctx->panel); + if (ret < 0) + dev_err(ctx->dev, "error preparing panel (%d)\n", ret); +} + +static void tc358764_enable(struct drm_bridge *bridge) +{ + struct tc358764 *ctx = bridge_to_tc358764(bridge); + int ret = drm_panel_enable(ctx->panel); + + if (ret < 0) + dev_err(ctx->dev, "error enabling panel (%d)\n", ret); } static int tc358764_attach(struct drm_bridge *bridge, enum drm_bridge_attach_flags flags) +{ + struct tc358764 *ctx = bridge_to_tc358764(bridge); + struct drm_device *drm = bridge->dev; + int ret; + + if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) { + DRM_ERROR("Fix bridge driver to make connector optional!"); + return -EINVAL; + } + + ctx->connector.polled = DRM_CONNECTOR_POLL_HPD; + ret = drm_connector_init(drm, &ctx->connector, + &tc358764_connector_funcs, + DRM_MODE_CONNECTOR_LVDS); + if (ret) { + DRM_ERROR("Failed to initialize connector\n"); + return ret; + } + + drm_connector_helper_add(&ctx->connector, + &tc358764_connector_helper_funcs); + drm_connector_attach_encoder(&ctx->connector, bridge->encoder); + ctx->connector.funcs->reset(&ctx->connector); + drm_connector_register(&ctx->connector); + + return 0; +} + +static void tc358764_detach(struct drm_bridge *bridge) { struct tc358764 *ctx = bridge_to_tc358764(bridge); - return drm_bridge_attach(bridge->encoder, ctx->panel_bridge, - bridge, flags); + drm_connector_unregister(&ctx->connector); + ctx->panel = NULL; + drm_connector_put(&ctx->connector); } static const struct drm_bridge_funcs tc358764_bridge_funcs = { + .disable = tc358764_disable, .post_disable = tc358764_post_disable, + .enable = tc358764_enable, .pre_enable = tc358764_pre_enable, .attach = tc358764_attach, + .detach = tc358764_detach, }; static int tc358764_parse_dt(struct tc358764 *ctx) { - struct drm_bridge *panel_bridge; struct device *dev = ctx->dev; - struct drm_panel *panel; int ret; ctx->gpio_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW); @@ -326,16 +408,12 @@ static int tc358764_parse_dt(struct tc358764 *ctx) return PTR_ERR(ctx->gpio_reset); } - ret = drm_of_find_panel_or_bridge(dev->of_node, 1, 0, &panel, NULL); - if (ret) - return ret; - - panel_bridge = devm_drm_panel_bridge_add(dev, panel); - if (IS_ERR(panel_bridge)) - return PTR_ERR(panel_bridge); + ret = drm_of_find_panel_or_bridge(ctx->dev->of_node, 1, 0, &ctx->panel, + NULL); + if (ret && ret != -EPROBE_DEFER) + dev_err(dev, "cannot find panel (%d)\n", ret); - ctx->panel_bridge = panel_bridge; - return 0; + return ret; } static int tc358764_configure_regulators(struct tc358764 *ctx) @@ -381,7 +459,6 @@ static int tc358764_probe(struct mipi_dsi_device *dsi) return ret; ctx->bridge.funcs = &tc358764_bridge_funcs; - ctx->bridge.type = DRM_MODE_CONNECTOR_LVDS; ctx->bridge.of_node = dev->of_node; drm_bridge_add(&ctx->bridge);
This patch restores DRM connector registration in the TC358764 bridge driver and restores usage of the old drm_panel_* API, thus allows dynamic panel registration. This fixes panel operation on Exynos5250-based Arndale board. This is equivalent to the revert of the following commits: 1644127f83bc "drm/bridge: tc358764: add drm_panel_bridge support" 385ca38da29c "drm/bridge: tc358764: drop drm_connector_(un)register" and removal of the calls to drm_panel_attach()/drm_panel_detach(), which were no-ops and has been removed in meanwhile. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> --- As I've reported and Andrzej Hajda pointed, the reverted patches break operation of the panel on the Arndale board. Noone suggested how to fix the regression, I've decided to send a revert until a new solution is found. The issues with tc358764 might be automatically resolved once the Exynos DSI itself is converted to DRM bridge: https://patchwork.kernel.org/cover/11770683/ but that approach has also its own issues so far. Best regards, Marek Szyprowski --- drivers/gpu/drm/bridge/tc358764.c | 107 +++++++++++++++++++++++++----- 1 file changed, 92 insertions(+), 15 deletions(-)