| Message ID | 20210704090230.26489-4-jagan@amarulasolutions.com |
|---|---|
| State | New |
| Headers | show |
| Series | [RFC,01/17] drm/exynos: dsi: Convert to bridge driver | expand |
On 04.07.2021 11:02, Jagan Teki wrote: > Use drm_panel_bridge to replace manual panel and > bridge_chain handling code. > > This makes the driver simpler to allow all components > in the display pipeline to be treated as bridges by > cleaning the way to generic connector handling. > > Signed-off-by: Jagan Teki <jagan@amarulasolutions.com> This breaks Exysos DSI driver operation (Trats board worked fine with only patches 1-2): [ 2.540066] exynos4-fb 11c00000.fimd: Adding to iommu group 0 [ 2.554733] OF: graph: no port node found in /soc/fimd@11c00000 [ 2.602819] [drm] Exynos DRM: using 11c00000.fimd device for DMA mapping operations [ 2.609649] exynos-drm exynos-drm: bound 11c00000.fimd (ops fimd_component_ops) [ 2.632558] exynos-drm exynos-drm: failed to bind 11c80000.dsi (ops exynos_dsi_component_ops): -22 [ 2.642263] exynos-drm exynos-drm: master bind failed: -22 [ 2.651017] exynos-drm: probe of exynos-drm failed with error -22 > --- > drivers/gpu/drm/exynos/exynos_drm_dsi.c | 167 ++++-------------------- > 1 file changed, 23 insertions(+), 144 deletions(-) > > diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c > index d7d60aee465b..24f0b082ac6d 100644 > --- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c > +++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c > @@ -254,9 +254,6 @@ struct exynos_dsi_driver_data { > struct exynos_dsi { > struct drm_encoder encoder; > struct mipi_dsi_host dsi_host; > - struct drm_connector connector; > - struct drm_panel *panel; > - struct list_head bridge_chain; > struct drm_bridge bridge; > struct drm_bridge *out_bridge; > struct drm_device *drm; > @@ -287,7 +284,6 @@ struct exynos_dsi { > }; > > #define host_to_dsi(host) container_of(host, struct exynos_dsi, dsi_host) > -#define connector_to_dsi(c) container_of(c, struct exynos_dsi, connector) > > static inline struct exynos_dsi *bridge_to_dsi(struct drm_bridge *b) > { > @@ -1379,7 +1375,6 @@ static void exynos_dsi_unregister_te_irq(struct exynos_dsi *dsi) > static void exynos_dsi_bridge_enable(struct drm_bridge *bridge) > { > struct exynos_dsi *dsi = bridge_to_dsi(bridge); > - struct drm_bridge *iter; > int ret; > > if (dsi->state & DSIM_STATE_ENABLED) > @@ -1393,134 +1388,51 @@ static void exynos_dsi_bridge_enable(struct drm_bridge *bridge) > > dsi->state |= DSIM_STATE_ENABLED; > > - if (dsi->panel) { > - ret = drm_panel_prepare(dsi->panel); > - if (ret < 0) > - goto err_put_sync; > - } else { > - list_for_each_entry_reverse(iter, &dsi->bridge_chain, > - chain_node) { > - if (iter->funcs->pre_enable) > - iter->funcs->pre_enable(iter); > - } > - } > - > exynos_dsi_set_display_mode(dsi); > exynos_dsi_set_display_enable(dsi, true); > > - if (dsi->panel) { > - ret = drm_panel_enable(dsi->panel); > - if (ret < 0) > - goto err_display_disable; > - } else { > - list_for_each_entry(iter, &dsi->bridge_chain, chain_node) { > - if (iter->funcs->enable) > - iter->funcs->enable(iter); > - } > - } > - > dsi->state |= DSIM_STATE_VIDOUT_AVAILABLE; > return; > - > -err_display_disable: > - exynos_dsi_set_display_enable(dsi, false); > - drm_panel_unprepare(dsi->panel); > - > -err_put_sync: > - dsi->state &= ~DSIM_STATE_ENABLED; > - pm_runtime_put(dsi->dev); > } > > static void exynos_dsi_bridge_disable(struct drm_bridge *bridge) > { > struct exynos_dsi *dsi = bridge_to_dsi(bridge); > - struct drm_bridge *iter; > > if (!(dsi->state & DSIM_STATE_ENABLED)) > return; > > dsi->state &= ~DSIM_STATE_VIDOUT_AVAILABLE; > > - drm_panel_disable(dsi->panel); > - > - list_for_each_entry_reverse(iter, &dsi->bridge_chain, chain_node) { > - if (iter->funcs->disable) > - iter->funcs->disable(iter); > - } > - > exynos_dsi_set_display_enable(dsi, false); > - drm_panel_unprepare(dsi->panel); > - > - list_for_each_entry(iter, &dsi->bridge_chain, chain_node) { > - if (iter->funcs->post_disable) > - iter->funcs->post_disable(iter); > - } > > dsi->state &= ~DSIM_STATE_ENABLED; > pm_runtime_put_sync(dsi->dev); > } > > -static enum drm_connector_status > -exynos_dsi_detect(struct drm_connector *connector, bool force) > -{ > - return connector->status; > -} > - > -static void exynos_dsi_connector_destroy(struct drm_connector *connector) > +static int exynos_dsi_panel_or_bridge(struct exynos_dsi *dsi, > + struct device_node *node) > { > - drm_connector_unregister(connector); > - drm_connector_cleanup(connector); > - connector->dev = NULL; > -} > - > -static const struct drm_connector_funcs exynos_dsi_connector_funcs = { > - .detect = exynos_dsi_detect, > - .fill_modes = drm_helper_probe_single_connector_modes, > - .destroy = exynos_dsi_connector_destroy, > - .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 int exynos_dsi_get_modes(struct drm_connector *connector) > -{ > - struct exynos_dsi *dsi = connector_to_dsi(connector); > - > - if (dsi->panel) > - return drm_panel_get_modes(dsi->panel, connector); > - > - return 0; > -} > + struct drm_bridge *panel_bridge; > + struct drm_panel *panel; > > -static const struct drm_connector_helper_funcs exynos_dsi_connector_helper_funcs = { > - .get_modes = exynos_dsi_get_modes, > -}; > + panel_bridge = of_drm_find_bridge(node); > + if (!panel_bridge) { > + panel = of_drm_find_panel(node); > + if (!IS_ERR(panel)) { > + panel_bridge = drm_panel_bridge_add(panel); > + if (IS_ERR(panel_bridge)) > + return PTR_ERR(panel_bridge); > + } > + } > > -static int exynos_dsi_create_connector(struct exynos_dsi *dsi, > - struct drm_device *drm) > -{ > - struct drm_encoder *encoder = &dsi->encoder; > - struct drm_connector *connector = &dsi->connector; > - int ret; > + of_node_put(node); > > - connector->polled = DRM_CONNECTOR_POLL_HPD; > + dsi->out_bridge = panel_bridge; > > - ret = drm_connector_init(drm, connector, &exynos_dsi_connector_funcs, > - DRM_MODE_CONNECTOR_DSI); > - if (ret) { > - DRM_DEV_ERROR(dsi->dev, > - "Failed to initialize connector with drm\n"); > - return ret; > - } > + if (!dsi->out_bridge) > + return -EPROBE_DEFER; > > - connector->status = connector_status_disconnected; > - drm_connector_helper_add(connector, &exynos_dsi_connector_helper_funcs); > - drm_connector_attach_encoder(connector, encoder); > - if (!drm->registered) > - return 0; > - > - connector->funcs->reset(connector); > - drm_connector_register(connector); > return 0; > } > > @@ -1531,7 +1443,8 @@ static int exynos_dsi_bridge_attach(struct drm_bridge *bridge, > > dsi->drm = bridge->dev; > > - return 0; > + return drm_bridge_attach(bridge->encoder, dsi->out_bridge, bridge, > + flags); > } > > static const struct drm_bridge_funcs exynos_dsi_bridge_funcs = { > @@ -1546,32 +1459,12 @@ static int exynos_dsi_host_attach(struct mipi_dsi_host *host, > struct mipi_dsi_device *device) > { > struct exynos_dsi *dsi = host_to_dsi(host); > - struct drm_encoder *encoder = &dsi->encoder; > struct drm_device *drm = dsi->drm; > - struct drm_bridge *out_bridge; > - > - out_bridge = of_drm_find_bridge(device->dev.of_node); > - if (out_bridge) { > - drm_bridge_attach(encoder, out_bridge, NULL, 0); > - dsi->out_bridge = out_bridge; > - list_splice_init(&encoder->bridge_chain, &dsi->bridge_chain); > - } else { > - int ret = exynos_dsi_create_connector(dsi, drm); > - > - if (ret) { > - DRM_DEV_ERROR(dsi->dev, > - "failed to create connector ret = %d\n", > - ret); > - drm_encoder_cleanup(encoder); > - return ret; > - } > + int ret; > > - dsi->panel = of_drm_find_panel(device->dev.of_node); > - if (IS_ERR(dsi->panel)) > - dsi->panel = NULL; > - else > - dsi->connector.status = connector_status_connected; > - } > + ret = exynos_dsi_panel_or_bridge(dsi, device->dev.of_node); > + if (ret) > + return ret; > > /* > * This is a temporary solution and should be made by more generic way. > @@ -1607,19 +1500,6 @@ static int exynos_dsi_host_detach(struct mipi_dsi_host *host, > struct exynos_dsi *dsi = host_to_dsi(host); > struct drm_device *drm = dsi->drm; > > - if (dsi->panel) { > - mutex_lock(&drm->mode_config.mutex); > - exynos_dsi_bridge_disable(&dsi->bridge); > - dsi->panel = NULL; > - dsi->connector.status = connector_status_disconnected; > - mutex_unlock(&drm->mode_config.mutex); > - } else { > - if (dsi->out_bridge->funcs->detach) > - dsi->out_bridge->funcs->detach(dsi->out_bridge); > - dsi->out_bridge = NULL; > - INIT_LIST_HEAD(&dsi->bridge_chain); > - } > - > if (drm->mode_config.poll_enabled) > drm_kms_helper_hotplug_event(drm); > > @@ -1770,7 +1650,6 @@ static int exynos_dsi_probe(struct platform_device *pdev) > init_completion(&dsi->completed); > spin_lock_init(&dsi->transfer_lock); > INIT_LIST_HEAD(&dsi->transfer_list); > - INIT_LIST_HEAD(&dsi->bridge_chain); > > dsi->dsi_host.ops = &exynos_dsi_ops; > dsi->dsi_host.dev = dev; Best regards -- Marek Szyprowski, PhD Samsung R&D Institute Poland
On Mon, Jul 5, 2021 at 5:18 PM Marek Szyprowski <m.szyprowski@samsung.com> wrote: > > On 04.07.2021 11:02, Jagan Teki wrote: > > Use drm_panel_bridge to replace manual panel and > > bridge_chain handling code. > > > > This makes the driver simpler to allow all components > > in the display pipeline to be treated as bridges by > > cleaning the way to generic connector handling. > > > > Signed-off-by: Jagan Teki <jagan@amarulasolutions.com> > > This breaks Exysos DSI driver operation (Trats board worked fine with > only patches 1-2): > > [ 2.540066] exynos4-fb 11c00000.fimd: Adding to iommu group 0 > [ 2.554733] OF: graph: no port node found in /soc/fimd@11c00000 > [ 2.602819] [drm] Exynos DRM: using 11c00000.fimd device for DMA > mapping operations > [ 2.609649] exynos-drm exynos-drm: bound 11c00000.fimd (ops > fimd_component_ops) > [ 2.632558] exynos-drm exynos-drm: failed to bind 11c80000.dsi (ops > exynos_dsi_component_ops): -22 > [ 2.642263] exynos-drm exynos-drm: master bind failed: -22 > [ 2.651017] exynos-drm: probe of exynos-drm failed with error -22 Thanks for testing it. Can you check Squash of 3,4 or 3,4,5 will work or not? Thanks, Jagan.
On 05.07.2021 14:00, Jagan Teki wrote: > On Mon, Jul 5, 2021 at 5:18 PM Marek Szyprowski > <m.szyprowski@samsung.com> wrote: >> On 04.07.2021 11:02, Jagan Teki wrote: >>> Use drm_panel_bridge to replace manual panel and >>> bridge_chain handling code. >>> >>> This makes the driver simpler to allow all components >>> in the display pipeline to be treated as bridges by >>> cleaning the way to generic connector handling. >>> >>> Signed-off-by: Jagan Teki <jagan@amarulasolutions.com> >> This breaks Exysos DSI driver operation (Trats board worked fine with >> only patches 1-2): >> >> [ 2.540066] exynos4-fb 11c00000.fimd: Adding to iommu group 0 >> [ 2.554733] OF: graph: no port node found in /soc/fimd@11c00000 >> [ 2.602819] [drm] Exynos DRM: using 11c00000.fimd device for DMA >> mapping operations >> [ 2.609649] exynos-drm exynos-drm: bound 11c00000.fimd (ops >> fimd_component_ops) >> [ 2.632558] exynos-drm exynos-drm: failed to bind 11c80000.dsi (ops >> exynos_dsi_component_ops): -22 >> [ 2.642263] exynos-drm exynos-drm: master bind failed: -22 >> [ 2.651017] exynos-drm: probe of exynos-drm failed with error -22 > Thanks for testing it. > > Can you check Squash of 3,4 or 3,4,5 will work or not? I've check both sets: 1-4 and 1-5 and none of them works. The result is same as above. If I remember correctly, last time when I played with that code, there was a problem with DRM core calling bridge ops in different order than when they are used by the Exynos DSI driver. Best regards -- Marek Szyprowski, PhD Samsung R&D Institute Poland
On Mon, Jul 5, 2021 at 5:43 PM Marek Szyprowski <m.szyprowski@samsung.com> wrote: > > On 05.07.2021 14:00, Jagan Teki wrote: > > On Mon, Jul 5, 2021 at 5:18 PM Marek Szyprowski > > <m.szyprowski@samsung.com> wrote: > >> On 04.07.2021 11:02, Jagan Teki wrote: > >>> Use drm_panel_bridge to replace manual panel and > >>> bridge_chain handling code. > >>> > >>> This makes the driver simpler to allow all components > >>> in the display pipeline to be treated as bridges by > >>> cleaning the way to generic connector handling. > >>> > >>> Signed-off-by: Jagan Teki <jagan@amarulasolutions.com> > >> This breaks Exysos DSI driver operation (Trats board worked fine with > >> only patches 1-2): > >> > >> [ 2.540066] exynos4-fb 11c00000.fimd: Adding to iommu group 0 > >> [ 2.554733] OF: graph: no port node found in /soc/fimd@11c00000 > >> [ 2.602819] [drm] Exynos DRM: using 11c00000.fimd device for DMA > >> mapping operations > >> [ 2.609649] exynos-drm exynos-drm: bound 11c00000.fimd (ops > >> fimd_component_ops) > >> [ 2.632558] exynos-drm exynos-drm: failed to bind 11c80000.dsi (ops > >> exynos_dsi_component_ops): -22 > >> [ 2.642263] exynos-drm exynos-drm: master bind failed: -22 > >> [ 2.651017] exynos-drm: probe of exynos-drm failed with error -22 > > Thanks for testing it. > > > > Can you check Squash of 3,4 or 3,4,5 will work or not? > > I've check both sets: 1-4 and 1-5 and none of them works. The result is > same as above. If I remember correctly, last time when I played with > that code, there was a problem with DRM core calling bridge ops in > different order than when they are used by the Exynos DSI driver. Okay. Let me check with sun6i-mipi-dsi as it is component_ops based. Jagan.
diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c index d7d60aee465b..24f0b082ac6d 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c +++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c @@ -254,9 +254,6 @@ struct exynos_dsi_driver_data { struct exynos_dsi { struct drm_encoder encoder; struct mipi_dsi_host dsi_host; - struct drm_connector connector; - struct drm_panel *panel; - struct list_head bridge_chain; struct drm_bridge bridge; struct drm_bridge *out_bridge; struct drm_device *drm; @@ -287,7 +284,6 @@ struct exynos_dsi { }; #define host_to_dsi(host) container_of(host, struct exynos_dsi, dsi_host) -#define connector_to_dsi(c) container_of(c, struct exynos_dsi, connector) static inline struct exynos_dsi *bridge_to_dsi(struct drm_bridge *b) { @@ -1379,7 +1375,6 @@ static void exynos_dsi_unregister_te_irq(struct exynos_dsi *dsi) static void exynos_dsi_bridge_enable(struct drm_bridge *bridge) { struct exynos_dsi *dsi = bridge_to_dsi(bridge); - struct drm_bridge *iter; int ret; if (dsi->state & DSIM_STATE_ENABLED) @@ -1393,134 +1388,51 @@ static void exynos_dsi_bridge_enable(struct drm_bridge *bridge) dsi->state |= DSIM_STATE_ENABLED; - if (dsi->panel) { - ret = drm_panel_prepare(dsi->panel); - if (ret < 0) - goto err_put_sync; - } else { - list_for_each_entry_reverse(iter, &dsi->bridge_chain, - chain_node) { - if (iter->funcs->pre_enable) - iter->funcs->pre_enable(iter); - } - } - exynos_dsi_set_display_mode(dsi); exynos_dsi_set_display_enable(dsi, true); - if (dsi->panel) { - ret = drm_panel_enable(dsi->panel); - if (ret < 0) - goto err_display_disable; - } else { - list_for_each_entry(iter, &dsi->bridge_chain, chain_node) { - if (iter->funcs->enable) - iter->funcs->enable(iter); - } - } - dsi->state |= DSIM_STATE_VIDOUT_AVAILABLE; return; - -err_display_disable: - exynos_dsi_set_display_enable(dsi, false); - drm_panel_unprepare(dsi->panel); - -err_put_sync: - dsi->state &= ~DSIM_STATE_ENABLED; - pm_runtime_put(dsi->dev); } static void exynos_dsi_bridge_disable(struct drm_bridge *bridge) { struct exynos_dsi *dsi = bridge_to_dsi(bridge); - struct drm_bridge *iter; if (!(dsi->state & DSIM_STATE_ENABLED)) return; dsi->state &= ~DSIM_STATE_VIDOUT_AVAILABLE; - drm_panel_disable(dsi->panel); - - list_for_each_entry_reverse(iter, &dsi->bridge_chain, chain_node) { - if (iter->funcs->disable) - iter->funcs->disable(iter); - } - exynos_dsi_set_display_enable(dsi, false); - drm_panel_unprepare(dsi->panel); - - list_for_each_entry(iter, &dsi->bridge_chain, chain_node) { - if (iter->funcs->post_disable) - iter->funcs->post_disable(iter); - } dsi->state &= ~DSIM_STATE_ENABLED; pm_runtime_put_sync(dsi->dev); } -static enum drm_connector_status -exynos_dsi_detect(struct drm_connector *connector, bool force) -{ - return connector->status; -} - -static void exynos_dsi_connector_destroy(struct drm_connector *connector) +static int exynos_dsi_panel_or_bridge(struct exynos_dsi *dsi, + struct device_node *node) { - drm_connector_unregister(connector); - drm_connector_cleanup(connector); - connector->dev = NULL; -} - -static const struct drm_connector_funcs exynos_dsi_connector_funcs = { - .detect = exynos_dsi_detect, - .fill_modes = drm_helper_probe_single_connector_modes, - .destroy = exynos_dsi_connector_destroy, - .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 int exynos_dsi_get_modes(struct drm_connector *connector) -{ - struct exynos_dsi *dsi = connector_to_dsi(connector); - - if (dsi->panel) - return drm_panel_get_modes(dsi->panel, connector); - - return 0; -} + struct drm_bridge *panel_bridge; + struct drm_panel *panel; -static const struct drm_connector_helper_funcs exynos_dsi_connector_helper_funcs = { - .get_modes = exynos_dsi_get_modes, -}; + panel_bridge = of_drm_find_bridge(node); + if (!panel_bridge) { + panel = of_drm_find_panel(node); + if (!IS_ERR(panel)) { + panel_bridge = drm_panel_bridge_add(panel); + if (IS_ERR(panel_bridge)) + return PTR_ERR(panel_bridge); + } + } -static int exynos_dsi_create_connector(struct exynos_dsi *dsi, - struct drm_device *drm) -{ - struct drm_encoder *encoder = &dsi->encoder; - struct drm_connector *connector = &dsi->connector; - int ret; + of_node_put(node); - connector->polled = DRM_CONNECTOR_POLL_HPD; + dsi->out_bridge = panel_bridge; - ret = drm_connector_init(drm, connector, &exynos_dsi_connector_funcs, - DRM_MODE_CONNECTOR_DSI); - if (ret) { - DRM_DEV_ERROR(dsi->dev, - "Failed to initialize connector with drm\n"); - return ret; - } + if (!dsi->out_bridge) + return -EPROBE_DEFER; - connector->status = connector_status_disconnected; - drm_connector_helper_add(connector, &exynos_dsi_connector_helper_funcs); - drm_connector_attach_encoder(connector, encoder); - if (!drm->registered) - return 0; - - connector->funcs->reset(connector); - drm_connector_register(connector); return 0; } @@ -1531,7 +1443,8 @@ static int exynos_dsi_bridge_attach(struct drm_bridge *bridge, dsi->drm = bridge->dev; - return 0; + return drm_bridge_attach(bridge->encoder, dsi->out_bridge, bridge, + flags); } static const struct drm_bridge_funcs exynos_dsi_bridge_funcs = { @@ -1546,32 +1459,12 @@ static int exynos_dsi_host_attach(struct mipi_dsi_host *host, struct mipi_dsi_device *device) { struct exynos_dsi *dsi = host_to_dsi(host); - struct drm_encoder *encoder = &dsi->encoder; struct drm_device *drm = dsi->drm; - struct drm_bridge *out_bridge; - - out_bridge = of_drm_find_bridge(device->dev.of_node); - if (out_bridge) { - drm_bridge_attach(encoder, out_bridge, NULL, 0); - dsi->out_bridge = out_bridge; - list_splice_init(&encoder->bridge_chain, &dsi->bridge_chain); - } else { - int ret = exynos_dsi_create_connector(dsi, drm); - - if (ret) { - DRM_DEV_ERROR(dsi->dev, - "failed to create connector ret = %d\n", - ret); - drm_encoder_cleanup(encoder); - return ret; - } + int ret; - dsi->panel = of_drm_find_panel(device->dev.of_node); - if (IS_ERR(dsi->panel)) - dsi->panel = NULL; - else - dsi->connector.status = connector_status_connected; - } + ret = exynos_dsi_panel_or_bridge(dsi, device->dev.of_node); + if (ret) + return ret; /* * This is a temporary solution and should be made by more generic way. @@ -1607,19 +1500,6 @@ static int exynos_dsi_host_detach(struct mipi_dsi_host *host, struct exynos_dsi *dsi = host_to_dsi(host); struct drm_device *drm = dsi->drm; - if (dsi->panel) { - mutex_lock(&drm->mode_config.mutex); - exynos_dsi_bridge_disable(&dsi->bridge); - dsi->panel = NULL; - dsi->connector.status = connector_status_disconnected; - mutex_unlock(&drm->mode_config.mutex); - } else { - if (dsi->out_bridge->funcs->detach) - dsi->out_bridge->funcs->detach(dsi->out_bridge); - dsi->out_bridge = NULL; - INIT_LIST_HEAD(&dsi->bridge_chain); - } - if (drm->mode_config.poll_enabled) drm_kms_helper_hotplug_event(drm); @@ -1770,7 +1650,6 @@ static int exynos_dsi_probe(struct platform_device *pdev) init_completion(&dsi->completed); spin_lock_init(&dsi->transfer_lock); INIT_LIST_HEAD(&dsi->transfer_list); - INIT_LIST_HEAD(&dsi->bridge_chain); dsi->dsi_host.ops = &exynos_dsi_ops; dsi->dsi_host.dev = dev;
Use drm_panel_bridge to replace manual panel and bridge_chain handling code. This makes the driver simpler to allow all components in the display pipeline to be treated as bridges by cleaning the way to generic connector handling. Signed-off-by: Jagan Teki <jagan@amarulasolutions.com> --- drivers/gpu/drm/exynos/exynos_drm_dsi.c | 167 ++++-------------------- 1 file changed, 23 insertions(+), 144 deletions(-)