[PATCH 0/2] drm: exynos: dsi: Convert drm bridge

[PATCH 0/2] drm: exynos: dsi: Convert drm bridge

[Jagan Teki]

This is initial step to convert exynos dsi to bridge and
make use of i.MX8MMini.

The previous RFC series for this is here [1]

I'm trying to add minimalist patches as I don't have hardware
to validate, the next plan is to add panel_bridge and other 
improvements.

[1] https://www.spinics.net/lists/devicetree/msg431794.html

Any Inputs?
Jagan.

Jagan Teki (2):
  drm: exynos: dsi: Convert to bridge driver
  drm: exynos: dsi: Add mode_set function

 drivers/gpu/drm/exynos/exynos_drm_dsi.c | 86 ++++++++++++++++++-------
 1 file changed, 63 insertions(+), 23 deletions(-)

-- 
2.25.1

[PATCH 1/2] drm: exynos: dsi: Convert to bridge driver

[Jagan Teki]

Some display panels would come up with a non-DSI output, those
can have an option to connect the DSI host by means of interface
bridge converter.

This DSI to non-DSI interface bridge converter would requires
DSI Host to handle drm bridge functionalities in order to DSI
Host to Interface bridge.

This patch convert the existing to a drm bridge driver with a
built-in encoder support for compatibility with existing
component drivers.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
---
Note:
Hi Marek Szyprowski, 

Please test this on Panel and Bridge hardware.

 drivers/gpu/drm/exynos/exynos_drm_dsi.c | 73 +++++++++++++++++--------
 1 file changed, 51 insertions(+), 22 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
index 8d137857818c..174590f543c3 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
@@ -257,6 +257,7 @@ struct exynos_dsi {
 	struct drm_connector connector;
 	struct drm_panel *panel;
 	struct list_head bridge_chain;
+	struct drm_bridge bridge;
 	struct drm_bridge *out_bridge;
 	struct device *dev;
 
@@ -287,9 +288,9 @@ 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 *encoder_to_dsi(struct drm_encoder *e)
+static inline struct exynos_dsi *bridge_to_dsi(struct drm_bridge *b)
 {
-	return container_of(e, struct exynos_dsi, encoder);
+	return container_of(b, struct exynos_dsi, bridge);
 }
 
 enum reg_idx {
@@ -1374,9 +1375,10 @@ static void exynos_dsi_unregister_te_irq(struct exynos_dsi *dsi)
 	}
 }
 
-static void exynos_dsi_enable(struct drm_encoder *encoder)
+static void exynos_dsi_atomic_enable(struct drm_bridge *bridge,
+				     struct drm_bridge_state *old_bridge_state)
 {
-	struct exynos_dsi *dsi = encoder_to_dsi(encoder);
+	struct exynos_dsi *dsi = bridge_to_dsi(bridge);
 	struct drm_bridge *iter;
 	int ret;
 
@@ -1399,7 +1401,8 @@ static void exynos_dsi_enable(struct drm_encoder *encoder)
 		list_for_each_entry_reverse(iter, &dsi->bridge_chain,
 					    chain_node) {
 			if (iter->funcs->pre_enable)
-				iter->funcs->pre_enable(iter);
+				iter->funcs->atomic_pre_enable(iter,
+							       old_bridge_state);
 		}
 	}
 
@@ -1413,7 +1416,7 @@ static void exynos_dsi_enable(struct drm_encoder *encoder)
 	} else {
 		list_for_each_entry(iter, &dsi->bridge_chain, chain_node) {
 			if (iter->funcs->enable)
-				iter->funcs->enable(iter);
+				iter->funcs->atomic_enable(iter, old_bridge_state);
 		}
 	}
 
@@ -1429,9 +1432,10 @@ static void exynos_dsi_enable(struct drm_encoder *encoder)
 	pm_runtime_put(dsi->dev);
 }
 
-static void exynos_dsi_disable(struct drm_encoder *encoder)
+static void exynos_dsi_atomic_disable(struct drm_bridge *bridge,
+				      struct drm_bridge_state *old_bridge_state)
 {
-	struct exynos_dsi *dsi = encoder_to_dsi(encoder);
+	struct exynos_dsi *dsi = bridge_to_dsi(bridge);
 	struct drm_bridge *iter;
 
 	if (!(dsi->state & DSIM_STATE_ENABLED))
@@ -1443,7 +1447,7 @@ static void exynos_dsi_disable(struct drm_encoder *encoder)
 
 	list_for_each_entry_reverse(iter, &dsi->bridge_chain, chain_node) {
 		if (iter->funcs->disable)
-			iter->funcs->disable(iter);
+			iter->funcs->atomic_disable(iter, old_bridge_state);
 	}
 
 	exynos_dsi_set_display_enable(dsi, false);
@@ -1451,7 +1455,7 @@ static void exynos_dsi_disable(struct drm_encoder *encoder)
 
 	list_for_each_entry(iter, &dsi->bridge_chain, chain_node) {
 		if (iter->funcs->post_disable)
-			iter->funcs->post_disable(iter);
+			iter->funcs->atomic_post_disable(iter, old_bridge_state);
 	}
 
 	dsi->state &= ~DSIM_STATE_ENABLED;
@@ -1494,9 +1498,9 @@ static const struct drm_connector_helper_funcs exynos_dsi_connector_helper_funcs
 	.get_modes = exynos_dsi_get_modes,
 };
 
-static int exynos_dsi_create_connector(struct drm_encoder *encoder)
+static int exynos_dsi_create_connector(struct exynos_dsi *dsi)
 {
-	struct exynos_dsi *dsi = encoder_to_dsi(encoder);
+	struct drm_encoder *encoder = &dsi->encoder;
 	struct drm_connector *connector = &dsi->connector;
 	struct drm_device *drm = encoder->dev;
 	int ret;
@@ -1522,9 +1526,21 @@ static int exynos_dsi_create_connector(struct drm_encoder *encoder)
 	return 0;
 }
 
-static const struct drm_encoder_helper_funcs exynos_dsi_encoder_helper_funcs = {
-	.enable = exynos_dsi_enable,
-	.disable = exynos_dsi_disable,
+static int exynos_dsi_attach(struct drm_bridge *bridge,
+			     enum drm_bridge_attach_flags flags)
+{
+	struct exynos_dsi *dsi = bridge_to_dsi(bridge);
+
+	return drm_bridge_attach(bridge->encoder, dsi->out_bridge, NULL, 0);
+}
+
+static const struct drm_bridge_funcs exynos_dsi_bridge_funcs = {
+	.atomic_duplicate_state	= drm_atomic_helper_bridge_duplicate_state,
+	.atomic_destroy_state	= drm_atomic_helper_bridge_destroy_state,
+	.atomic_reset		= drm_atomic_helper_bridge_reset,
+	.atomic_enable		= exynos_dsi_atomic_enable,
+	.atomic_disable		= exynos_dsi_atomic_disable,
+	.attach			= exynos_dsi_attach,
 };
 
 MODULE_DEVICE_TABLE(of, exynos_dsi_of_match);
@@ -1543,7 +1559,7 @@ static int exynos_dsi_host_attach(struct mipi_dsi_host *host,
 		dsi->out_bridge = out_bridge;
 		list_splice_init(&encoder->bridge_chain, &dsi->bridge_chain);
 	} else {
-		int ret = exynos_dsi_create_connector(encoder);
+		int ret = exynos_dsi_create_connector(dsi);
 
 		if (ret) {
 			DRM_DEV_ERROR(dsi->dev,
@@ -1596,7 +1612,7 @@ static int exynos_dsi_host_detach(struct mipi_dsi_host *host,
 
 	if (dsi->panel) {
 		mutex_lock(&drm->mode_config.mutex);
-		exynos_dsi_disable(&dsi->encoder);
+		exynos_dsi_atomic_disable(&dsi->bridge, NULL);
 		dsi->panel = NULL;
 		dsi->connector.status = connector_status_disconnected;
 		mutex_unlock(&drm->mode_config.mutex);
@@ -1702,12 +1718,16 @@ static int exynos_dsi_bind(struct device *dev, struct device *master,
 
 	drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_TMDS);
 
-	drm_encoder_helper_add(encoder, &exynos_dsi_encoder_helper_funcs);
-
 	ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD);
 	if (ret < 0)
 		return ret;
 
+	ret = drm_bridge_attach(&dsi->encoder, &dsi->bridge, NULL, 0);
+	if (ret) {
+		drm_encoder_cleanup(&dsi->encoder);
+		return ret;
+	}
+
 	in_bridge_node = of_graph_get_remote_node(dev->of_node, DSI_PORT_IN, 0);
 	if (in_bridge_node) {
 		in_bridge = of_drm_find_bridge(in_bridge_node);
@@ -1723,10 +1743,9 @@ static void exynos_dsi_unbind(struct device *dev, struct device *master,
 				void *data)
 {
 	struct exynos_dsi *dsi = dev_get_drvdata(dev);
-	struct drm_encoder *encoder = &dsi->encoder;
-
-	exynos_dsi_disable(encoder);
 
+	exynos_dsi_atomic_disable(&dsi->bridge, NULL);
+	drm_encoder_cleanup(&dsi->encoder);
 	mipi_dsi_host_unregister(&dsi->dsi_host);
 }
 
@@ -1819,6 +1838,12 @@ static int exynos_dsi_probe(struct platform_device *pdev)
 
 	pm_runtime_enable(dev);
 
+	dsi->bridge.funcs = &exynos_dsi_bridge_funcs;
+	dsi->bridge.of_node = dev->of_node;
+	dsi->bridge.type = DRM_MODE_CONNECTOR_DSI;
+
+	drm_bridge_add(&dsi->bridge);
+
 	ret = component_add(dev, &exynos_dsi_component_ops);
 	if (ret)
 		goto err_disable_runtime;
@@ -1833,6 +1858,10 @@ static int exynos_dsi_probe(struct platform_device *pdev)
 
 static int exynos_dsi_remove(struct platform_device *pdev)
 {
+	struct exynos_dsi *dsi = platform_get_drvdata(pdev);
+
+	drm_bridge_remove(&dsi->bridge);
+
 	pm_runtime_disable(&pdev->dev);
 
 	component_del(&pdev->dev, &exynos_dsi_component_ops);
-- 
2.25.1

Re: [PATCH 1/2] drm: exynos: dsi: Convert to bridge driver

[Jagan Teki]

Hi Marek.

On Mon, Nov 22, 2021 at 12:36 PM Jagan Teki <jagan@amarulasolutions.com> wrote:
>
> Some display panels would come up with a non-DSI output, those
> can have an option to connect the DSI host by means of interface
> bridge converter.
>
> This DSI to non-DSI interface bridge converter would requires
> DSI Host to handle drm bridge functionalities in order to DSI
> Host to Interface bridge.
>
> This patch convert the existing to a drm bridge driver with a
> built-in encoder support for compatibility with existing
> component drivers.
>
> Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
> ---
> Note:
> Hi Marek Szyprowski,
>
> Please test this on Panel and Bridge hardware.
>
>  drivers/gpu/drm/exynos/exynos_drm_dsi.c | 73 +++++++++++++++++--------
>  1 file changed, 51 insertions(+), 22 deletions(-)
>
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> index 8d137857818c..174590f543c3 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> @@ -257,6 +257,7 @@ struct exynos_dsi {
>         struct drm_connector connector;
>         struct drm_panel *panel;
>         struct list_head bridge_chain;
> +       struct drm_bridge bridge;
>         struct drm_bridge *out_bridge;
>         struct device *dev;
>
> @@ -287,9 +288,9 @@ 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 *encoder_to_dsi(struct drm_encoder *e)
> +static inline struct exynos_dsi *bridge_to_dsi(struct drm_bridge *b)
>  {
> -       return container_of(e, struct exynos_dsi, encoder);
> +       return container_of(b, struct exynos_dsi, bridge);
>  }
>
>  enum reg_idx {
> @@ -1374,9 +1375,10 @@ static void exynos_dsi_unregister_te_irq(struct exynos_dsi *dsi)
>         }
>  }
>
> -static void exynos_dsi_enable(struct drm_encoder *encoder)
> +static void exynos_dsi_atomic_enable(struct drm_bridge *bridge,
> +                                    struct drm_bridge_state *old_bridge_state)
>  {
> -       struct exynos_dsi *dsi = encoder_to_dsi(encoder);
> +       struct exynos_dsi *dsi = bridge_to_dsi(bridge);
>         struct drm_bridge *iter;
>         int ret;
>
> @@ -1399,7 +1401,8 @@ static void exynos_dsi_enable(struct drm_encoder *encoder)
>                 list_for_each_entry_reverse(iter, &dsi->bridge_chain,
>                                             chain_node) {
>                         if (iter->funcs->pre_enable)
> -                               iter->funcs->pre_enable(iter);
> +                               iter->funcs->atomic_pre_enable(iter,
> +                                                              old_bridge_state);
>                 }
>         }
>
> @@ -1413,7 +1416,7 @@ static void exynos_dsi_enable(struct drm_encoder *encoder)
>         } else {
>                 list_for_each_entry(iter, &dsi->bridge_chain, chain_node) {
>                         if (iter->funcs->enable)
> -                               iter->funcs->enable(iter);
> +                               iter->funcs->atomic_enable(iter, old_bridge_state);
>                 }
>         }
>
> @@ -1429,9 +1432,10 @@ static void exynos_dsi_enable(struct drm_encoder *encoder)
>         pm_runtime_put(dsi->dev);
>  }
>
> -static void exynos_dsi_disable(struct drm_encoder *encoder)
> +static void exynos_dsi_atomic_disable(struct drm_bridge *bridge,
> +                                     struct drm_bridge_state *old_bridge_state)
>  {
> -       struct exynos_dsi *dsi = encoder_to_dsi(encoder);
> +       struct exynos_dsi *dsi = bridge_to_dsi(bridge);
>         struct drm_bridge *iter;
>
>         if (!(dsi->state & DSIM_STATE_ENABLED))
> @@ -1443,7 +1447,7 @@ static void exynos_dsi_disable(struct drm_encoder *encoder)
>
>         list_for_each_entry_reverse(iter, &dsi->bridge_chain, chain_node) {
>                 if (iter->funcs->disable)
> -                       iter->funcs->disable(iter);
> +                       iter->funcs->atomic_disable(iter, old_bridge_state);
>         }
>
>         exynos_dsi_set_display_enable(dsi, false);
> @@ -1451,7 +1455,7 @@ static void exynos_dsi_disable(struct drm_encoder *encoder)
>
>         list_for_each_entry(iter, &dsi->bridge_chain, chain_node) {
>                 if (iter->funcs->post_disable)
> -                       iter->funcs->post_disable(iter);
> +                       iter->funcs->atomic_post_disable(iter, old_bridge_state);
>         }
>
>         dsi->state &= ~DSIM_STATE_ENABLED;
> @@ -1494,9 +1498,9 @@ static const struct drm_connector_helper_funcs exynos_dsi_connector_helper_funcs
>         .get_modes = exynos_dsi_get_modes,
>  };
>
> -static int exynos_dsi_create_connector(struct drm_encoder *encoder)
> +static int exynos_dsi_create_connector(struct exynos_dsi *dsi)
>  {
> -       struct exynos_dsi *dsi = encoder_to_dsi(encoder);
> +       struct drm_encoder *encoder = &dsi->encoder;
>         struct drm_connector *connector = &dsi->connector;
>         struct drm_device *drm = encoder->dev;
>         int ret;
> @@ -1522,9 +1526,21 @@ static int exynos_dsi_create_connector(struct drm_encoder *encoder)
>         return 0;
>  }
>
> -static const struct drm_encoder_helper_funcs exynos_dsi_encoder_helper_funcs = {
> -       .enable = exynos_dsi_enable,
> -       .disable = exynos_dsi_disable,
> +static int exynos_dsi_attach(struct drm_bridge *bridge,
> +                            enum drm_bridge_attach_flags flags)
> +{
> +       struct exynos_dsi *dsi = bridge_to_dsi(bridge);
> +
> +       return drm_bridge_attach(bridge->encoder, dsi->out_bridge, NULL, 0);
> +}
> +
> +static const struct drm_bridge_funcs exynos_dsi_bridge_funcs = {
> +       .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
> +       .atomic_destroy_state   = drm_atomic_helper_bridge_destroy_state,
> +       .atomic_reset           = drm_atomic_helper_bridge_reset,
> +       .atomic_enable          = exynos_dsi_atomic_enable,
> +       .atomic_disable         = exynos_dsi_atomic_disable,
> +       .attach                 = exynos_dsi_attach,
>  };
>
>  MODULE_DEVICE_TABLE(of, exynos_dsi_of_match);
> @@ -1543,7 +1559,7 @@ static int exynos_dsi_host_attach(struct mipi_dsi_host *host,
>                 dsi->out_bridge = out_bridge;
>                 list_splice_init(&encoder->bridge_chain, &dsi->bridge_chain);
>         } else {
> -               int ret = exynos_dsi_create_connector(encoder);
> +               int ret = exynos_dsi_create_connector(dsi);
>
>                 if (ret) {
>                         DRM_DEV_ERROR(dsi->dev,
> @@ -1596,7 +1612,7 @@ static int exynos_dsi_host_detach(struct mipi_dsi_host *host,
>
>         if (dsi->panel) {
>                 mutex_lock(&drm->mode_config.mutex);
> -               exynos_dsi_disable(&dsi->encoder);
> +               exynos_dsi_atomic_disable(&dsi->bridge, NULL);
>                 dsi->panel = NULL;
>                 dsi->connector.status = connector_status_disconnected;
>                 mutex_unlock(&drm->mode_config.mutex);
> @@ -1702,12 +1718,16 @@ static int exynos_dsi_bind(struct device *dev, struct device *master,
>
>         drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_TMDS);
>
> -       drm_encoder_helper_add(encoder, &exynos_dsi_encoder_helper_funcs);
> -
>         ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD);
>         if (ret < 0)
>                 return ret;
>
> +       ret = drm_bridge_attach(&dsi->encoder, &dsi->bridge, NULL, 0);
> +       if (ret) {
> +               drm_encoder_cleanup(&dsi->encoder);
> +               return ret;
> +       }
> +
>         in_bridge_node = of_graph_get_remote_node(dev->of_node, DSI_PORT_IN, 0);
>         if (in_bridge_node) {
>                 in_bridge = of_drm_find_bridge(in_bridge_node);
> @@ -1723,10 +1743,9 @@ static void exynos_dsi_unbind(struct device *dev, struct device *master,
>                                 void *data)
>  {
>         struct exynos_dsi *dsi = dev_get_drvdata(dev);
> -       struct drm_encoder *encoder = &dsi->encoder;
> -
> -       exynos_dsi_disable(encoder);
>
> +       exynos_dsi_atomic_disable(&dsi->bridge, NULL);
> +       drm_encoder_cleanup(&dsi->encoder);
>         mipi_dsi_host_unregister(&dsi->dsi_host);
>  }
>
> @@ -1819,6 +1838,12 @@ static int exynos_dsi_probe(struct platform_device *pdev)
>
>         pm_runtime_enable(dev);
>
> +       dsi->bridge.funcs = &exynos_dsi_bridge_funcs;
> +       dsi->bridge.of_node = dev->of_node;
> +       dsi->bridge.type = DRM_MODE_CONNECTOR_DSI;
> +
> +       drm_bridge_add(&dsi->bridge);
> +
>         ret = component_add(dev, &exynos_dsi_component_ops);
>         if (ret)
>                 goto err_disable_runtime;
> @@ -1833,6 +1858,10 @@ static int exynos_dsi_probe(struct platform_device *pdev)
>
>  static int exynos_dsi_remove(struct platform_device *pdev)
>  {
> +       struct exynos_dsi *dsi = platform_get_drvdata(pdev);
> +
> +       drm_bridge_remove(&dsi->bridge);
> +
>         pm_runtime_disable(&pdev->dev);
>
>         component_del(&pdev->dev, &exynos_dsi_component_ops);

Can you please test this on Panel and Bridge devices, I've consecutive
patches to move this driver to bridge in order to i.MX8MM, testing
from your side would really helpful.

Thanks,
Jagan.

Re: [PATCH 1/2] drm: exynos: dsi: Convert to bridge driver

[Marek Szyprowski]

On 22.11.2021 08:06, Jagan Teki wrote:
> Some display panels would come up with a non-DSI output, those
> can have an option to connect the DSI host by means of interface
> bridge converter.
>
> This DSI to non-DSI interface bridge converter would requires
> DSI Host to handle drm bridge functionalities in order to DSI
> Host to Interface bridge.
>
> This patch convert the existing to a drm bridge driver with a
> built-in encoder support for compatibility with existing
> component drivers.
>
> Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
> ---
> Note:
> Hi Marek Szyprowski,
>
> Please test this on Panel and Bridge hardware.

I don't have good news, t crashes:

[drm] Exynos DRM: using 13800000.decon device for DMA mapping operations
exynos-drm exynos-drm: bound 13800000.decon (ops decon_component_ops)
exynos-drm exynos-drm: bound 13880000.decon (ops decon_component_ops)
exynos-drm exynos-drm: bound 13930000.mic (ops exynos_mic_component_ops)
[drm:drm_bridge_attach] *ERROR* failed to attach bridge 
/soc@0/dsi@13900000 to encoder TMDS-67: -22
exynos-drm exynos-drm: failed to bind 13900000.dsi (ops 
exynos_dsi_component_ops): -22
Internal error: synchronous external abort: 96000210 [#1] PREEMPT SMP
Modules linked in:
CPU: 2 PID: 74 Comm: kworker/u16:1 Not tainted 5.16.0-rc1+ #4141
Hardware name: Samsung TM2E board (DT)
Workqueue: events_unbound deferred_probe_work_func
pstate: 80000005 (Nzcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : decon_atomic_disable+0x58/0xd4
lr : decon_atomic_disable+0x28/0xd4
sp : ffff80001390b940
x29: ffff80001390b940 x28: ffff80001259a000 x27: ffff000027f39e80
input: stmfts as 
/devices/platform/soc@0/14ed0000.hsi2c/i2c-3/3-0049/input/input0
x26: 00000000ffffffea x25: ffff000025a40280 x24: 0000000000000001
x23: ffff800011b55f98 x22: ffff0000315dc000 x21: ffff00002695d100
x20: ffff000027e7a080 x19: ffff0000315e6000 x18: 0000000000000000
x17: 645f736f6e797865 x16: 2073706f28206973 x15: 0000000000028ee0
x14: 0000000000000028 x13: 0000000000000001 x12: 0000000000000040
x11: ffff000023c18920 x10: ffff000023c18922 x9 : ffff8000126352f0
x8 : ffff000023c00270 x7 : 0000000000000000 x6 : ffff000023c00268
x5 : ffff000027e7a3a0 x4 : 0000000000000001 x3 : ffff000027e7a080
x2 : 0000000000000024 x1 : ffff800013bc8024 x0 : ffff0000246117c0
Call trace:
  decon_atomic_disable+0x58/0xd4
  decon_unbind+0x1c/0x3c
  component_unbind+0x38/0x60
  component_bind_all+0x16c/0x25c
  exynos_drm_bind+0x104/0x1bc
  try_to_bring_up_master+0x164/0x1d0
  __component_add+0xa8/0x174
  component_add+0x14/0x20
  hdmi_probe+0x438/0x710
  platform_probe+0x68/0xe0
  really_probe.part.0+0x9c/0x31c
  __driver_probe_device+0x98/0x144
  driver_probe_device+0xc8/0x160
  __device_attach_driver+0xb8/0x120
  bus_for_each_drv+0x78/0xd0
  __device_attach+0xd8/0x180
  device_initial_probe+0x14/0x20
  bus_probe_device+0x9c/0xa4
  deferred_probe_work_func+0x88/0xc4
  process_one_work+0x288/0x6f0
  worker_thread+0x74/0x470
  kthread+0x188/0x194
  ret_from_fork+0x10/0x20
Code: 11002042 f9481c61 531e7442 8b020021 (88dffc21)
---[ end trace d73aff585b108954 ]---
Kernel panic - not syncing: synchronous external abort: Fatal exception
SMP: stopping secondary CPUs
Kernel Offset: disabled
CPU features: 0x2,300071c2,00000846
Memory Limit: none
---[ end Kernel panic - not syncing: synchronous external abort: Fatal 
exception ]---

I will try to debug it a bit more once I find some spare time. I've 
applied only the first patch.

>   drivers/gpu/drm/exynos/exynos_drm_dsi.c | 73 +++++++++++++++++--------
>   1 file changed, 51 insertions(+), 22 deletions(-)
>
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> index 8d137857818c..174590f543c3 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> @@ -257,6 +257,7 @@ struct exynos_dsi {
>   	struct drm_connector connector;
>   	struct drm_panel *panel;
>   	struct list_head bridge_chain;
> +	struct drm_bridge bridge;
>   	struct drm_bridge *out_bridge;
>   	struct device *dev;
>   
> @@ -287,9 +288,9 @@ 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 *encoder_to_dsi(struct drm_encoder *e)
> +static inline struct exynos_dsi *bridge_to_dsi(struct drm_bridge *b)
>   {
> -	return container_of(e, struct exynos_dsi, encoder);
> +	return container_of(b, struct exynos_dsi, bridge);
>   }
>   
>   enum reg_idx {
> @@ -1374,9 +1375,10 @@ static void exynos_dsi_unregister_te_irq(struct exynos_dsi *dsi)
>   	}
>   }
>   
> -static void exynos_dsi_enable(struct drm_encoder *encoder)
> +static void exynos_dsi_atomic_enable(struct drm_bridge *bridge,
> +				     struct drm_bridge_state *old_bridge_state)
>   {
> -	struct exynos_dsi *dsi = encoder_to_dsi(encoder);
> +	struct exynos_dsi *dsi = bridge_to_dsi(bridge);
>   	struct drm_bridge *iter;
>   	int ret;
>   
> @@ -1399,7 +1401,8 @@ static void exynos_dsi_enable(struct drm_encoder *encoder)
>   		list_for_each_entry_reverse(iter, &dsi->bridge_chain,
>   					    chain_node) {
>   			if (iter->funcs->pre_enable)
> -				iter->funcs->pre_enable(iter);
> +				iter->funcs->atomic_pre_enable(iter,
> +							       old_bridge_state);
>   		}
>   	}
>   
> @@ -1413,7 +1416,7 @@ static void exynos_dsi_enable(struct drm_encoder *encoder)
>   	} else {
>   		list_for_each_entry(iter, &dsi->bridge_chain, chain_node) {
>   			if (iter->funcs->enable)
> -				iter->funcs->enable(iter);
> +				iter->funcs->atomic_enable(iter, old_bridge_state);
>   		}
>   	}
>   
> @@ -1429,9 +1432,10 @@ static void exynos_dsi_enable(struct drm_encoder *encoder)
>   	pm_runtime_put(dsi->dev);
>   }
>   
> -static void exynos_dsi_disable(struct drm_encoder *encoder)
> +static void exynos_dsi_atomic_disable(struct drm_bridge *bridge,
> +				      struct drm_bridge_state *old_bridge_state)
>   {
> -	struct exynos_dsi *dsi = encoder_to_dsi(encoder);
> +	struct exynos_dsi *dsi = bridge_to_dsi(bridge);
>   	struct drm_bridge *iter;
>   
>   	if (!(dsi->state & DSIM_STATE_ENABLED))
> @@ -1443,7 +1447,7 @@ static void exynos_dsi_disable(struct drm_encoder *encoder)
>   
>   	list_for_each_entry_reverse(iter, &dsi->bridge_chain, chain_node) {
>   		if (iter->funcs->disable)
> -			iter->funcs->disable(iter);
> +			iter->funcs->atomic_disable(iter, old_bridge_state);
>   	}
>   
>   	exynos_dsi_set_display_enable(dsi, false);
> @@ -1451,7 +1455,7 @@ static void exynos_dsi_disable(struct drm_encoder *encoder)
>   
>   	list_for_each_entry(iter, &dsi->bridge_chain, chain_node) {
>   		if (iter->funcs->post_disable)
> -			iter->funcs->post_disable(iter);
> +			iter->funcs->atomic_post_disable(iter, old_bridge_state);
>   	}
>   
>   	dsi->state &= ~DSIM_STATE_ENABLED;
> @@ -1494,9 +1498,9 @@ static const struct drm_connector_helper_funcs exynos_dsi_connector_helper_funcs
>   	.get_modes = exynos_dsi_get_modes,
>   };
>   
> -static int exynos_dsi_create_connector(struct drm_encoder *encoder)
> +static int exynos_dsi_create_connector(struct exynos_dsi *dsi)
>   {
> -	struct exynos_dsi *dsi = encoder_to_dsi(encoder);
> +	struct drm_encoder *encoder = &dsi->encoder;
>   	struct drm_connector *connector = &dsi->connector;
>   	struct drm_device *drm = encoder->dev;
>   	int ret;
> @@ -1522,9 +1526,21 @@ static int exynos_dsi_create_connector(struct drm_encoder *encoder)
>   	return 0;
>   }
>   
> -static const struct drm_encoder_helper_funcs exynos_dsi_encoder_helper_funcs = {
> -	.enable = exynos_dsi_enable,
> -	.disable = exynos_dsi_disable,
> +static int exynos_dsi_attach(struct drm_bridge *bridge,
> +			     enum drm_bridge_attach_flags flags)
> +{
> +	struct exynos_dsi *dsi = bridge_to_dsi(bridge);
> +
> +	return drm_bridge_attach(bridge->encoder, dsi->out_bridge, NULL, 0);
> +}
> +
> +static const struct drm_bridge_funcs exynos_dsi_bridge_funcs = {
> +	.atomic_duplicate_state	= drm_atomic_helper_bridge_duplicate_state,
> +	.atomic_destroy_state	= drm_atomic_helper_bridge_destroy_state,
> +	.atomic_reset		= drm_atomic_helper_bridge_reset,
> +	.atomic_enable		= exynos_dsi_atomic_enable,
> +	.atomic_disable		= exynos_dsi_atomic_disable,
> +	.attach			= exynos_dsi_attach,
>   };
>   
>   MODULE_DEVICE_TABLE(of, exynos_dsi_of_match);
> @@ -1543,7 +1559,7 @@ static int exynos_dsi_host_attach(struct mipi_dsi_host *host,
>   		dsi->out_bridge = out_bridge;
>   		list_splice_init(&encoder->bridge_chain, &dsi->bridge_chain);
>   	} else {
> -		int ret = exynos_dsi_create_connector(encoder);
> +		int ret = exynos_dsi_create_connector(dsi);
>   
>   		if (ret) {
>   			DRM_DEV_ERROR(dsi->dev,
> @@ -1596,7 +1612,7 @@ static int exynos_dsi_host_detach(struct mipi_dsi_host *host,
>   
>   	if (dsi->panel) {
>   		mutex_lock(&drm->mode_config.mutex);
> -		exynos_dsi_disable(&dsi->encoder);
> +		exynos_dsi_atomic_disable(&dsi->bridge, NULL);
>   		dsi->panel = NULL;
>   		dsi->connector.status = connector_status_disconnected;
>   		mutex_unlock(&drm->mode_config.mutex);
> @@ -1702,12 +1718,16 @@ static int exynos_dsi_bind(struct device *dev, struct device *master,
>   
>   	drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_TMDS);
>   
> -	drm_encoder_helper_add(encoder, &exynos_dsi_encoder_helper_funcs);
> -
>   	ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD);
>   	if (ret < 0)
>   		return ret;
>   
> +	ret = drm_bridge_attach(&dsi->encoder, &dsi->bridge, NULL, 0);
> +	if (ret) {
> +		drm_encoder_cleanup(&dsi->encoder);
> +		return ret;
> +	}
> +
>   	in_bridge_node = of_graph_get_remote_node(dev->of_node, DSI_PORT_IN, 0);
>   	if (in_bridge_node) {
>   		in_bridge = of_drm_find_bridge(in_bridge_node);
> @@ -1723,10 +1743,9 @@ static void exynos_dsi_unbind(struct device *dev, struct device *master,
>   				void *data)
>   {
>   	struct exynos_dsi *dsi = dev_get_drvdata(dev);
> -	struct drm_encoder *encoder = &dsi->encoder;
> -
> -	exynos_dsi_disable(encoder);
>   
> +	exynos_dsi_atomic_disable(&dsi->bridge, NULL);
> +	drm_encoder_cleanup(&dsi->encoder);
>   	mipi_dsi_host_unregister(&dsi->dsi_host);
>   }
>   
> @@ -1819,6 +1838,12 @@ static int exynos_dsi_probe(struct platform_device *pdev)
>   
>   	pm_runtime_enable(dev);
>   
> +	dsi->bridge.funcs = &exynos_dsi_bridge_funcs;
> +	dsi->bridge.of_node = dev->of_node;
> +	dsi->bridge.type = DRM_MODE_CONNECTOR_DSI;
> +
> +	drm_bridge_add(&dsi->bridge);
> +
>   	ret = component_add(dev, &exynos_dsi_component_ops);
>   	if (ret)
>   		goto err_disable_runtime;
> @@ -1833,6 +1858,10 @@ static int exynos_dsi_probe(struct platform_device *pdev)
>   
>   static int exynos_dsi_remove(struct platform_device *pdev)
>   {
> +	struct exynos_dsi *dsi = platform_get_drvdata(pdev);
> +
> +	drm_bridge_remove(&dsi->bridge);
> +
>   	pm_runtime_disable(&pdev->dev);
>   
>   	component_del(&pdev->dev, &exynos_dsi_component_ops);

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland

Re: [PATCH 1/2] drm: exynos: dsi: Convert to bridge driver

[Jagan Teki]

Hi Marek,

On Mon, Nov 22, 2021 at 7:45 PM Marek Szyprowski
<m.szyprowski@samsung.com> wrote:
>
> On 22.11.2021 08:06, Jagan Teki wrote:
> > Some display panels would come up with a non-DSI output, those
> > can have an option to connect the DSI host by means of interface
> > bridge converter.
> >
> > This DSI to non-DSI interface bridge converter would requires
> > DSI Host to handle drm bridge functionalities in order to DSI
> > Host to Interface bridge.
> >
> > This patch convert the existing to a drm bridge driver with a
> > built-in encoder support for compatibility with existing
> > component drivers.
> >
> > Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
> > ---
> > Note:
> > Hi Marek Szyprowski,
> >
> > Please test this on Panel and Bridge hardware.
>
> I don't have good news, t crashes:
>
> [drm] Exynos DRM: using 13800000.decon device for DMA mapping operations
> exynos-drm exynos-drm: bound 13800000.decon (ops decon_component_ops)
> exynos-drm exynos-drm: bound 13880000.decon (ops decon_component_ops)
> exynos-drm exynos-drm: bound 13930000.mic (ops exynos_mic_component_ops)
> [drm:drm_bridge_attach] *ERROR* failed to attach bridge
> /soc@0/dsi@13900000 to encoder TMDS-67: -22
> exynos-drm exynos-drm: failed to bind 13900000.dsi (ops
> exynos_dsi_component_ops): -22
> Internal error: synchronous external abort: 96000210 [#1] PREEMPT SMP
> Modules linked in:
> CPU: 2 PID: 74 Comm: kworker/u16:1 Not tainted 5.16.0-rc1+ #4141
> Hardware name: Samsung TM2E board (DT)
> Workqueue: events_unbound deferred_probe_work_func
> pstate: 80000005 (Nzcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> pc : decon_atomic_disable+0x58/0xd4
> lr : decon_atomic_disable+0x28/0xd4
> sp : ffff80001390b940
> x29: ffff80001390b940 x28: ffff80001259a000 x27: ffff000027f39e80
> input: stmfts as
> /devices/platform/soc@0/14ed0000.hsi2c/i2c-3/3-0049/input/input0
> x26: 00000000ffffffea x25: ffff000025a40280 x24: 0000000000000001
> x23: ffff800011b55f98 x22: ffff0000315dc000 x21: ffff00002695d100
> x20: ffff000027e7a080 x19: ffff0000315e6000 x18: 0000000000000000
> x17: 645f736f6e797865 x16: 2073706f28206973 x15: 0000000000028ee0
> x14: 0000000000000028 x13: 0000000000000001 x12: 0000000000000040
> x11: ffff000023c18920 x10: ffff000023c18922 x9 : ffff8000126352f0
> x8 : ffff000023c00270 x7 : 0000000000000000 x6 : ffff000023c00268
> x5 : ffff000027e7a3a0 x4 : 0000000000000001 x3 : ffff000027e7a080
> x2 : 0000000000000024 x1 : ffff800013bc8024 x0 : ffff0000246117c0
> Call trace:
>   decon_atomic_disable+0x58/0xd4
>   decon_unbind+0x1c/0x3c
>   component_unbind+0x38/0x60
>   component_bind_all+0x16c/0x25c
>   exynos_drm_bind+0x104/0x1bc
>   try_to_bring_up_master+0x164/0x1d0
>   __component_add+0xa8/0x174
>   component_add+0x14/0x20
>   hdmi_probe+0x438/0x710
>   platform_probe+0x68/0xe0
>   really_probe.part.0+0x9c/0x31c
>   __driver_probe_device+0x98/0x144
>   driver_probe_device+0xc8/0x160
>   __device_attach_driver+0xb8/0x120
>   bus_for_each_drv+0x78/0xd0
>   __device_attach+0xd8/0x180
>   device_initial_probe+0x14/0x20
>   bus_probe_device+0x9c/0xa4
>   deferred_probe_work_func+0x88/0xc4
>   process_one_work+0x288/0x6f0
>   worker_thread+0x74/0x470
>   kthread+0x188/0x194
>   ret_from_fork+0x10/0x20
> Code: 11002042 f9481c61 531e7442 8b020021 (88dffc21)
> ---[ end trace d73aff585b108954 ]---
> Kernel panic - not syncing: synchronous external abort: Fatal exception
> SMP: stopping secondary CPUs
> Kernel Offset: disabled
> CPU features: 0x2,300071c2,00000846
> Memory Limit: none
> ---[ end Kernel panic - not syncing: synchronous external abort: Fatal
> exception ]---

Is this with Bridge or normal DSI panel?

Jagan.

Re: [PATCH 1/2] drm: exynos: dsi: Convert to bridge driver

[Jagan Teki]

Hi Marek,

On Mon, Nov 22, 2021 at 7:51 PM Jagan Teki <jagan@amarulasolutions.com> wrote:
>
> Hi Marek,
>
> On Mon, Nov 22, 2021 at 7:45 PM Marek Szyprowski
> <m.szyprowski@samsung.com> wrote:
> >
> > On 22.11.2021 08:06, Jagan Teki wrote:
> > > Some display panels would come up with a non-DSI output, those
> > > can have an option to connect the DSI host by means of interface
> > > bridge converter.
> > >
> > > This DSI to non-DSI interface bridge converter would requires
> > > DSI Host to handle drm bridge functionalities in order to DSI
> > > Host to Interface bridge.
> > >
> > > This patch convert the existing to a drm bridge driver with a
> > > built-in encoder support for compatibility with existing
> > > component drivers.
> > >
> > > Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
> > > ---
> > > Note:
> > > Hi Marek Szyprowski,
> > >
> > > Please test this on Panel and Bridge hardware.
> >
> > I don't have good news, t crashes:
> >
> > [drm] Exynos DRM: using 13800000.decon device for DMA mapping operations
> > exynos-drm exynos-drm: bound 13800000.decon (ops decon_component_ops)
> > exynos-drm exynos-drm: bound 13880000.decon (ops decon_component_ops)
> > exynos-drm exynos-drm: bound 13930000.mic (ops exynos_mic_component_ops)
> > [drm:drm_bridge_attach] *ERROR* failed to attach bridge
> > /soc@0/dsi@13900000 to encoder TMDS-67: -22
> > exynos-drm exynos-drm: failed to bind 13900000.dsi (ops
> > exynos_dsi_component_ops): -22
> > Internal error: synchronous external abort: 96000210 [#1] PREEMPT SMP
> > Modules linked in:
> > CPU: 2 PID: 74 Comm: kworker/u16:1 Not tainted 5.16.0-rc1+ #4141
> > Hardware name: Samsung TM2E board (DT)
> > Workqueue: events_unbound deferred_probe_work_func
> > pstate: 80000005 (Nzcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> > pc : decon_atomic_disable+0x58/0xd4
> > lr : decon_atomic_disable+0x28/0xd4
> > sp : ffff80001390b940
> > x29: ffff80001390b940 x28: ffff80001259a000 x27: ffff000027f39e80
> > input: stmfts as
> > /devices/platform/soc@0/14ed0000.hsi2c/i2c-3/3-0049/input/input0
> > x26: 00000000ffffffea x25: ffff000025a40280 x24: 0000000000000001
> > x23: ffff800011b55f98 x22: ffff0000315dc000 x21: ffff00002695d100
> > x20: ffff000027e7a080 x19: ffff0000315e6000 x18: 0000000000000000
> > x17: 645f736f6e797865 x16: 2073706f28206973 x15: 0000000000028ee0
> > x14: 0000000000000028 x13: 0000000000000001 x12: 0000000000000040
> > x11: ffff000023c18920 x10: ffff000023c18922 x9 : ffff8000126352f0
> > x8 : ffff000023c00270 x7 : 0000000000000000 x6 : ffff000023c00268
> > x5 : ffff000027e7a3a0 x4 : 0000000000000001 x3 : ffff000027e7a080
> > x2 : 0000000000000024 x1 : ffff800013bc8024 x0 : ffff0000246117c0
> > Call trace:
> >   decon_atomic_disable+0x58/0xd4
> >   decon_unbind+0x1c/0x3c
> >   component_unbind+0x38/0x60
> >   component_bind_all+0x16c/0x25c
> >   exynos_drm_bind+0x104/0x1bc
> >   try_to_bring_up_master+0x164/0x1d0
> >   __component_add+0xa8/0x174
> >   component_add+0x14/0x20
> >   hdmi_probe+0x438/0x710
> >   platform_probe+0x68/0xe0
> >   really_probe.part.0+0x9c/0x31c
> >   __driver_probe_device+0x98/0x144
> >   driver_probe_device+0xc8/0x160
> >   __device_attach_driver+0xb8/0x120
> >   bus_for_each_drv+0x78/0xd0
> >   __device_attach+0xd8/0x180
> >   device_initial_probe+0x14/0x20
> >   bus_probe_device+0x9c/0xa4
> >   deferred_probe_work_func+0x88/0xc4
> >   process_one_work+0x288/0x6f0
> >   worker_thread+0x74/0x470
> >   kthread+0x188/0x194
> >   ret_from_fork+0x10/0x20
> > Code: 11002042 f9481c61 531e7442 8b020021 (88dffc21)
> > ---[ end trace d73aff585b108954 ]---
> > Kernel panic - not syncing: synchronous external abort: Fatal exception
> > SMP: stopping secondary CPUs
> > Kernel Offset: disabled
> > CPU features: 0x2,300071c2,00000846
> > Memory Limit: none
> > ---[ end Kernel panic - not syncing: synchronous external abort: Fatal
> > exception ]---
>
> Is this with Bridge or normal DSI panel?

Can you apply this patch and check?
https://github.com/openedev/linux/commit/412f226acd774356e8188c9e62b653672926ee0d

Jagan.

Re: [PATCH 1/2] drm: exynos: dsi: Convert to bridge driver

[Jagan Teki]

Hi Marek,

On Mon, Nov 22, 2021 at 7:59 PM Jagan Teki <jagan@amarulasolutions.com> wrote:
>
> Hi Marek,
>
> On Mon, Nov 22, 2021 at 7:51 PM Jagan Teki <jagan@amarulasolutions.com> wrote:
> >
> > Hi Marek,
> >
> > On Mon, Nov 22, 2021 at 7:45 PM Marek Szyprowski
> > <m.szyprowski@samsung.com> wrote:
> > >
> > > On 22.11.2021 08:06, Jagan Teki wrote:
> > > > Some display panels would come up with a non-DSI output, those
> > > > can have an option to connect the DSI host by means of interface
> > > > bridge converter.
> > > >
> > > > This DSI to non-DSI interface bridge converter would requires
> > > > DSI Host to handle drm bridge functionalities in order to DSI
> > > > Host to Interface bridge.
> > > >
> > > > This patch convert the existing to a drm bridge driver with a
> > > > built-in encoder support for compatibility with existing
> > > > component drivers.
> > > >
> > > > Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
> > > > ---
> > > > Note:
> > > > Hi Marek Szyprowski,
> > > >
> > > > Please test this on Panel and Bridge hardware.
> > >
> > > I don't have good news, t crashes:
> > >
> > > [drm] Exynos DRM: using 13800000.decon device for DMA mapping operations
> > > exynos-drm exynos-drm: bound 13800000.decon (ops decon_component_ops)
> > > exynos-drm exynos-drm: bound 13880000.decon (ops decon_component_ops)
> > > exynos-drm exynos-drm: bound 13930000.mic (ops exynos_mic_component_ops)
> > > [drm:drm_bridge_attach] *ERROR* failed to attach bridge
> > > /soc@0/dsi@13900000 to encoder TMDS-67: -22
> > > exynos-drm exynos-drm: failed to bind 13900000.dsi (ops
> > > exynos_dsi_component_ops): -22
> > > Internal error: synchronous external abort: 96000210 [#1] PREEMPT SMP
> > > Modules linked in:
> > > CPU: 2 PID: 74 Comm: kworker/u16:1 Not tainted 5.16.0-rc1+ #4141
> > > Hardware name: Samsung TM2E board (DT)
> > > Workqueue: events_unbound deferred_probe_work_func
> > > pstate: 80000005 (Nzcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> > > pc : decon_atomic_disable+0x58/0xd4
> > > lr : decon_atomic_disable+0x28/0xd4
> > > sp : ffff80001390b940
> > > x29: ffff80001390b940 x28: ffff80001259a000 x27: ffff000027f39e80
> > > input: stmfts as
> > > /devices/platform/soc@0/14ed0000.hsi2c/i2c-3/3-0049/input/input0
> > > x26: 00000000ffffffea x25: ffff000025a40280 x24: 0000000000000001
> > > x23: ffff800011b55f98 x22: ffff0000315dc000 x21: ffff00002695d100
> > > x20: ffff000027e7a080 x19: ffff0000315e6000 x18: 0000000000000000
> > > x17: 645f736f6e797865 x16: 2073706f28206973 x15: 0000000000028ee0
> > > x14: 0000000000000028 x13: 0000000000000001 x12: 0000000000000040
> > > x11: ffff000023c18920 x10: ffff000023c18922 x9 : ffff8000126352f0
> > > x8 : ffff000023c00270 x7 : 0000000000000000 x6 : ffff000023c00268
> > > x5 : ffff000027e7a3a0 x4 : 0000000000000001 x3 : ffff000027e7a080
> > > x2 : 0000000000000024 x1 : ffff800013bc8024 x0 : ffff0000246117c0
> > > Call trace:
> > >   decon_atomic_disable+0x58/0xd4
> > >   decon_unbind+0x1c/0x3c
> > >   component_unbind+0x38/0x60
> > >   component_bind_all+0x16c/0x25c
> > >   exynos_drm_bind+0x104/0x1bc
> > >   try_to_bring_up_master+0x164/0x1d0
> > >   __component_add+0xa8/0x174
> > >   component_add+0x14/0x20
> > >   hdmi_probe+0x438/0x710
> > >   platform_probe+0x68/0xe0
> > >   really_probe.part.0+0x9c/0x31c
> > >   __driver_probe_device+0x98/0x144
> > >   driver_probe_device+0xc8/0x160
> > >   __device_attach_driver+0xb8/0x120
> > >   bus_for_each_drv+0x78/0xd0
> > >   __device_attach+0xd8/0x180
> > >   device_initial_probe+0x14/0x20
> > >   bus_probe_device+0x9c/0xa4
> > >   deferred_probe_work_func+0x88/0xc4
> > >   process_one_work+0x288/0x6f0
> > >   worker_thread+0x74/0x470
> > >   kthread+0x188/0x194
> > >   ret_from_fork+0x10/0x20
> > > Code: 11002042 f9481c61 531e7442 8b020021 (88dffc21)
> > > ---[ end trace d73aff585b108954 ]---
> > > Kernel panic - not syncing: synchronous external abort: Fatal exception
> > > SMP: stopping secondary CPUs
> > > Kernel Offset: disabled
> > > CPU features: 0x2,300071c2,00000846
> > > Memory Limit: none
> > > ---[ end Kernel panic - not syncing: synchronous external abort: Fatal
> > > exception ]---
> >
> > Is this with Bridge or normal DSI panel?
>
> Can you apply this patch and check?
> https://github.com/openedev/linux/commit/412f226acd774356e8188c9e62b653672926ee0d

Any news on this? just asking in case if you missed it.

Jagan.

Re: [PATCH 1/2] drm: exynos: dsi: Convert to bridge driver

[Marek Szyprowski]

On 22.11.2021 15:55, Jagan Teki wrote:
> On Mon, Nov 22, 2021 at 7:59 PM Jagan Teki <jagan@amarulasolutions.com> wrote:
>> On Mon, Nov 22, 2021 at 7:51 PM Jagan Teki <jagan@amarulasolutions.com> wrote:
>>> On Mon, Nov 22, 2021 at 7:45 PM Marek Szyprowski
>>> <m.szyprowski@samsung.com> wrote:
>>>> On 22.11.2021 08:06, Jagan Teki wrote:
>>>>> Some display panels would come up with a non-DSI output, those
>>>>> can have an option to connect the DSI host by means of interface
>>>>> bridge converter.
>>>>>
>>>>> This DSI to non-DSI interface bridge converter would requires
>>>>> DSI Host to handle drm bridge functionalities in order to DSI
>>>>> Host to Interface bridge.
>>>>>
>>>>> This patch convert the existing to a drm bridge driver with a
>>>>> built-in encoder support for compatibility with existing
>>>>> component drivers.
>>>>>
>>>>> Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
>>>>> ---
>>>>> Note:
>>>>> Hi Marek Szyprowski,
>>>>>
>>>>> Please test this on Panel and Bridge hardware.
>>>> I don't have good news, t crashes:
>>>>
>>>> [drm] Exynos DRM: using 13800000.decon device for DMA mapping operations
>>>> exynos-drm exynos-drm: bound 13800000.decon (ops decon_component_ops)
>>>> exynos-drm exynos-drm: bound 13880000.decon (ops decon_component_ops)
>>>> exynos-drm exynos-drm: bound 13930000.mic (ops exynos_mic_component_ops)
>>>> [drm:drm_bridge_attach] *ERROR* failed to attach bridge
>>>> /soc@0/dsi@13900000 to encoder TMDS-67: -22
>>>> exynos-drm exynos-drm: failed to bind 13900000.dsi (ops
>>>> exynos_dsi_component_ops): -22
>>>> Internal error: synchronous external abort: 96000210 [#1] PREEMPT SMP
>>>> Modules linked in:
>>>> CPU: 2 PID: 74 Comm: kworker/u16:1 Not tainted 5.16.0-rc1+ #4141
>>>> Hardware name: Samsung TM2E board (DT)
>>>> Workqueue: events_unbound deferred_probe_work_func
>>>> pstate: 80000005 (Nzcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
>>>> pc : decon_atomic_disable+0x58/0xd4
>>>> lr : decon_atomic_disable+0x28/0xd4
>>>> sp : ffff80001390b940
>>>> x29: ffff80001390b940 x28: ffff80001259a000 x27: ffff000027f39e80
>>>> input: stmfts as
>>>> /devices/platform/soc@0/14ed0000.hsi2c/i2c-3/3-0049/input/input0
>>>> x26: 00000000ffffffea x25: ffff000025a40280 x24: 0000000000000001
>>>> x23: ffff800011b55f98 x22: ffff0000315dc000 x21: ffff00002695d100
>>>> x20: ffff000027e7a080 x19: ffff0000315e6000 x18: 0000000000000000
>>>> x17: 645f736f6e797865 x16: 2073706f28206973 x15: 0000000000028ee0
>>>> x14: 0000000000000028 x13: 0000000000000001 x12: 0000000000000040
>>>> x11: ffff000023c18920 x10: ffff000023c18922 x9 : ffff8000126352f0
>>>> x8 : ffff000023c00270 x7 : 0000000000000000 x6 : ffff000023c00268
>>>> x5 : ffff000027e7a3a0 x4 : 0000000000000001 x3 : ffff000027e7a080
>>>> x2 : 0000000000000024 x1 : ffff800013bc8024 x0 : ffff0000246117c0
>>>> Call trace:
>>>>    decon_atomic_disable+0x58/0xd4
>>>>    decon_unbind+0x1c/0x3c
>>>>    component_unbind+0x38/0x60
>>>>    component_bind_all+0x16c/0x25c
>>>>    exynos_drm_bind+0x104/0x1bc
>>>>    try_to_bring_up_master+0x164/0x1d0
>>>>    __component_add+0xa8/0x174
>>>>    component_add+0x14/0x20
>>>>    hdmi_probe+0x438/0x710
>>>>    platform_probe+0x68/0xe0
>>>>    really_probe.part.0+0x9c/0x31c
>>>>    __driver_probe_device+0x98/0x144
>>>>    driver_probe_device+0xc8/0x160
>>>>    __device_attach_driver+0xb8/0x120
>>>>    bus_for_each_drv+0x78/0xd0
>>>>    __device_attach+0xd8/0x180
>>>>    device_initial_probe+0x14/0x20
>>>>    bus_probe_device+0x9c/0xa4
>>>>    deferred_probe_work_func+0x88/0xc4
>>>>    process_one_work+0x288/0x6f0
>>>>    worker_thread+0x74/0x470
>>>>    kthread+0x188/0x194
>>>>    ret_from_fork+0x10/0x20
>>>> Code: 11002042 f9481c61 531e7442 8b020021 (88dffc21)
>>>> ---[ end trace d73aff585b108954 ]---
>>>> Kernel panic - not syncing: synchronous external abort: Fatal exception
>>>> SMP: stopping secondary CPUs
>>>> Kernel Offset: disabled
>>>> CPU features: 0x2,300071c2,00000846
>>>> Memory Limit: none
>>>> ---[ end Kernel panic - not syncing: synchronous external abort: Fatal
>>>> exception ]---
>>> Is this with Bridge or normal DSI panel?
>> Can you apply this patch and check?
>> https://protect2.fireeye.com/v1/url?k=aad62f08-f54d1627-aad7a447-0cc47a31cdf8-ea5858ddb7f0ecfe&q=1&e=2d730862-2c56-4988-a252-8febd02da578&u=https%3A%2F%2Fgithub.com%2Fopenedev%2Flinux%2Fcommit%2F412f226acd774356e8188c9e62b653672926ee0d
> Any news on this? just asking in case if you missed it.

It is somehow better. System doesn't crash, but the DRM is not bound:

# cat /sys/kernel/debug/device_component/exynos-drm
master name                                            status
-------------------------------------------------------------
exynos-drm                                          not bound

device name                                            status
-------------------------------------------------------------
13800000.decon                                      not bound
13880000.decon                                      not bound
13930000.mic                                        not bound
(unknown)                                      not registered
(unknown)                                      not registered

Best regards

-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland

Re: [PATCH 1/2] drm: exynos: dsi: Convert to bridge driver

[Marek Szyprowski]

On 22.11.2021 16:07, Marek Szyprowski wrote:
> On 22.11.2021 15:55, Jagan Teki wrote:
>> On Mon, Nov 22, 2021 at 7:59 PM Jagan Teki 
>> <jagan@amarulasolutions.com> wrote:
>>> On Mon, Nov 22, 2021 at 7:51 PM Jagan Teki 
>>> <jagan@amarulasolutions.com> wrote:
>>>> On Mon, Nov 22, 2021 at 7:45 PM Marek Szyprowski
>>>> <m.szyprowski@samsung.com> wrote:
>>>>> On 22.11.2021 08:06, Jagan Teki wrote:
>>>>>> Some display panels would come up with a non-DSI output, those
>>>>>> can have an option to connect the DSI host by means of interface
>>>>>> bridge converter.
>>>>>>
>>>>>> This DSI to non-DSI interface bridge converter would requires
>>>>>> DSI Host to handle drm bridge functionalities in order to DSI
>>>>>> Host to Interface bridge.
>>>>>>
>>>>>> This patch convert the existing to a drm bridge driver with a
>>>>>> built-in encoder support for compatibility with existing
>>>>>> component drivers.
>>>>>>
>>>>>> Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
>>>>>> ---
>>>>>> Note:
>>>>>> Hi Marek Szyprowski,
>>>>>>
>>>>>> Please test this on Panel and Bridge hardware.
>>>>> I don't have good news, t crashes:
>>>>>
>>>>> [drm] Exynos DRM: using 13800000.decon device for DMA mapping 
>>>>> operations
>>>>> exynos-drm exynos-drm: bound 13800000.decon (ops decon_component_ops)
>>>>> exynos-drm exynos-drm: bound 13880000.decon (ops decon_component_ops)
>>>>> exynos-drm exynos-drm: bound 13930000.mic (ops 
>>>>> exynos_mic_component_ops)
>>>>> [drm:drm_bridge_attach] *ERROR* failed to attach bridge
>>>>> /soc@0/dsi@13900000 to encoder TMDS-67: -22
>>>>> exynos-drm exynos-drm: failed to bind 13900000.dsi (ops
>>>>> exynos_dsi_component_ops): -22
>>>>> Internal error: synchronous external abort: 96000210 [#1] PREEMPT SMP
>>>>> Modules linked in:
>>>>> CPU: 2 PID: 74 Comm: kworker/u16:1 Not tainted 5.16.0-rc1+ #4141
>>>>> Hardware name: Samsung TM2E board (DT)
>>>>> Workqueue: events_unbound deferred_probe_work_func
>>>>> pstate: 80000005 (Nzcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
>>>>> pc : decon_atomic_disable+0x58/0xd4
>>>>> lr : decon_atomic_disable+0x28/0xd4
>>>>> sp : ffff80001390b940
>>>>> x29: ffff80001390b940 x28: ffff80001259a000 x27: ffff000027f39e80
>>>>> input: stmfts as
>>>>> /devices/platform/soc@0/14ed0000.hsi2c/i2c-3/3-0049/input/input0
>>>>> x26: 00000000ffffffea x25: ffff000025a40280 x24: 0000000000000001
>>>>> x23: ffff800011b55f98 x22: ffff0000315dc000 x21: ffff00002695d100
>>>>> x20: ffff000027e7a080 x19: ffff0000315e6000 x18: 0000000000000000
>>>>> x17: 645f736f6e797865 x16: 2073706f28206973 x15: 0000000000028ee0
>>>>> x14: 0000000000000028 x13: 0000000000000001 x12: 0000000000000040
>>>>> x11: ffff000023c18920 x10: ffff000023c18922 x9 : ffff8000126352f0
>>>>> x8 : ffff000023c00270 x7 : 0000000000000000 x6 : ffff000023c00268
>>>>> x5 : ffff000027e7a3a0 x4 : 0000000000000001 x3 : ffff000027e7a080
>>>>> x2 : 0000000000000024 x1 : ffff800013bc8024 x0 : ffff0000246117c0
>>>>> Call trace:
>>>>>    decon_atomic_disable+0x58/0xd4
>>>>>    decon_unbind+0x1c/0x3c
>>>>>    component_unbind+0x38/0x60
>>>>>    component_bind_all+0x16c/0x25c
>>>>>    exynos_drm_bind+0x104/0x1bc
>>>>>    try_to_bring_up_master+0x164/0x1d0
>>>>>    __component_add+0xa8/0x174
>>>>>    component_add+0x14/0x20
>>>>>    hdmi_probe+0x438/0x710
>>>>>    platform_probe+0x68/0xe0
>>>>>    really_probe.part.0+0x9c/0x31c
>>>>>    __driver_probe_device+0x98/0x144
>>>>>    driver_probe_device+0xc8/0x160
>>>>>    __device_attach_driver+0xb8/0x120
>>>>>    bus_for_each_drv+0x78/0xd0
>>>>>    __device_attach+0xd8/0x180
>>>>>    device_initial_probe+0x14/0x20
>>>>>    bus_probe_device+0x9c/0xa4
>>>>>    deferred_probe_work_func+0x88/0xc4
>>>>>    process_one_work+0x288/0x6f0
>>>>>    worker_thread+0x74/0x470
>>>>>    kthread+0x188/0x194
>>>>>    ret_from_fork+0x10/0x20
>>>>> Code: 11002042 f9481c61 531e7442 8b020021 (88dffc21)
>>>>> ---[ end trace d73aff585b108954 ]---
>>>>> Kernel panic - not syncing: synchronous external abort: Fatal 
>>>>> exception
>>>>> SMP: stopping secondary CPUs
>>>>> Kernel Offset: disabled
>>>>> CPU features: 0x2,300071c2,00000846
>>>>> Memory Limit: none
>>>>> ---[ end Kernel panic - not syncing: synchronous external abort: 
>>>>> Fatal
>>>>> exception ]---
>>>> Is this with Bridge or normal DSI panel?
>>> Can you apply this patch and check?
>>> https://protect2.fireeye.com/v1/url?k=aad62f08-f54d1627-aad7a447-0cc47a31cdf8-ea5858ddb7f0ecfe&q=1&e=2d730862-2c56-4988-a252-8febd02da578&u=https%3A%2F%2Fgithub.com%2Fopenedev%2Flinux%2Fcommit%2F412f226acd774356e8188c9e62b653672926ee0d 
>>>
>> Any news on this? just asking in case if you missed it.
>
> It is somehow better. System doesn't crash, but the DRM is not bound:
>
> # cat /sys/kernel/debug/device_component/exynos-drm
> master name                                            status
> -------------------------------------------------------------
> exynos-drm                                          not bound
>
> device name                                            status
> -------------------------------------------------------------
> 13800000.decon                                      not bound
> 13880000.decon                                      not bound
> 13930000.mic                                        not bound
> (unknown)                                      not registered
> (unknown)                                      not registered
>
Well, I also checked a much simpler case, the Samsung Trats board 
(arch/arm/boot/dts/exynos4210-trats.dts). It has only Exynos FIMD 
(CRTC), Exynos DSI (encoder) and s6e8aa0 panel. No bridges at all. With 
only the $subject patch applied I got the following errors:

exynos4-fb 11c00000.fimd: Adding to iommu group 0
OF: graph: no port node found in /soc/fimd@11c00000
[drm] Exynos DRM: using 11c00000.fimd device for DMA mapping operations
exynos-drm exynos-drm: bound 11c00000.fimd (ops fimd_component_ops)
[drm:drm_bridge_attach] *ERROR* failed to attach bridge 
/soc/dsi@11c80000 to encoder TMDS-50: -22
exynos-drm exynos-drm: failed to bind 11c80000.dsi (ops 
exynos_dsi_component_ops): -22
exynos-drm exynos-drm: master bind failed: -22
exynos-drm: probe of exynos-drm failed with error -22
lima 13000000.gpu: gp - mali400 version major 1 minor 1
lima 13000000.gpu: pp0 - mali400 version major 1 minor 1
lima 13000000.gpu: pp1 - mali400 version major 1 minor 1
lima 13000000.gpu: pp2 - mali400 version major 1 minor 1
lima 13000000.gpu: pp3 - mali400 version major 1 minor 1
lima 13000000.gpu: l2 cache 128K, 4-way, 64byte cache line, 64bit 
external bus
lima 13000000.gpu: bus rate = 200000000
lima 13000000.gpu: mod rate = 100000000
lima 13000000.gpu: dev_pm_opp_set_regulators: no regulator (mali) found: -19
[drm] Initialized lima 1.1.0 20191231 for 13000000.gpu on minor 0


After applying "drm: exynos: dsi: Add component only once DSI device 
attached" the Exynos DRM is not even tried to bind:

# dmesg | grep drm
[    2.495898] [drm] Initialized lima 1.1.0 20191231 for 13000000.gpu on 
minor 0

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland

Re: [PATCH 1/2] drm: exynos: dsi: Convert to bridge driver

[Jagan Teki]

Hi Marek,

On Mon, Nov 22, 2021 at 9:34 PM Marek Szyprowski
<m.szyprowski@samsung.com> wrote:
>
> On 22.11.2021 16:07, Marek Szyprowski wrote:
> > On 22.11.2021 15:55, Jagan Teki wrote:
> >> On Mon, Nov 22, 2021 at 7:59 PM Jagan Teki
> >> <jagan@amarulasolutions.com> wrote:
> >>> On Mon, Nov 22, 2021 at 7:51 PM Jagan Teki
> >>> <jagan@amarulasolutions.com> wrote:
> >>>> On Mon, Nov 22, 2021 at 7:45 PM Marek Szyprowski
> >>>> <m.szyprowski@samsung.com> wrote:
> >>>>> On 22.11.2021 08:06, Jagan Teki wrote:
> >>>>>> Some display panels would come up with a non-DSI output, those
> >>>>>> can have an option to connect the DSI host by means of interface
> >>>>>> bridge converter.
> >>>>>>
> >>>>>> This DSI to non-DSI interface bridge converter would requires
> >>>>>> DSI Host to handle drm bridge functionalities in order to DSI
> >>>>>> Host to Interface bridge.
> >>>>>>
> >>>>>> This patch convert the existing to a drm bridge driver with a
> >>>>>> built-in encoder support for compatibility with existing
> >>>>>> component drivers.
> >>>>>>
> >>>>>> Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
> >>>>>> ---
> >>>>>> Note:
> >>>>>> Hi Marek Szyprowski,
> >>>>>>
> >>>>>> Please test this on Panel and Bridge hardware.
> >>>>> I don't have good news, t crashes:
> >>>>>
> >>>>> [drm] Exynos DRM: using 13800000.decon device for DMA mapping
> >>>>> operations
> >>>>> exynos-drm exynos-drm: bound 13800000.decon (ops decon_component_ops)
> >>>>> exynos-drm exynos-drm: bound 13880000.decon (ops decon_component_ops)
> >>>>> exynos-drm exynos-drm: bound 13930000.mic (ops
> >>>>> exynos_mic_component_ops)
> >>>>> [drm:drm_bridge_attach] *ERROR* failed to attach bridge
> >>>>> /soc@0/dsi@13900000 to encoder TMDS-67: -22
> >>>>> exynos-drm exynos-drm: failed to bind 13900000.dsi (ops
> >>>>> exynos_dsi_component_ops): -22
> >>>>> Internal error: synchronous external abort: 96000210 [#1] PREEMPT SMP
> >>>>> Modules linked in:
> >>>>> CPU: 2 PID: 74 Comm: kworker/u16:1 Not tainted 5.16.0-rc1+ #4141
> >>>>> Hardware name: Samsung TM2E board (DT)
> >>>>> Workqueue: events_unbound deferred_probe_work_func
> >>>>> pstate: 80000005 (Nzcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> >>>>> pc : decon_atomic_disable+0x58/0xd4
> >>>>> lr : decon_atomic_disable+0x28/0xd4
> >>>>> sp : ffff80001390b940
> >>>>> x29: ffff80001390b940 x28: ffff80001259a000 x27: ffff000027f39e80
> >>>>> input: stmfts as
> >>>>> /devices/platform/soc@0/14ed0000.hsi2c/i2c-3/3-0049/input/input0
> >>>>> x26: 00000000ffffffea x25: ffff000025a40280 x24: 0000000000000001
> >>>>> x23: ffff800011b55f98 x22: ffff0000315dc000 x21: ffff00002695d100
> >>>>> x20: ffff000027e7a080 x19: ffff0000315e6000 x18: 0000000000000000
> >>>>> x17: 645f736f6e797865 x16: 2073706f28206973 x15: 0000000000028ee0
> >>>>> x14: 0000000000000028 x13: 0000000000000001 x12: 0000000000000040
> >>>>> x11: ffff000023c18920 x10: ffff000023c18922 x9 : ffff8000126352f0
> >>>>> x8 : ffff000023c00270 x7 : 0000000000000000 x6 : ffff000023c00268
> >>>>> x5 : ffff000027e7a3a0 x4 : 0000000000000001 x3 : ffff000027e7a080
> >>>>> x2 : 0000000000000024 x1 : ffff800013bc8024 x0 : ffff0000246117c0
> >>>>> Call trace:
> >>>>>    decon_atomic_disable+0x58/0xd4
> >>>>>    decon_unbind+0x1c/0x3c
> >>>>>    component_unbind+0x38/0x60
> >>>>>    component_bind_all+0x16c/0x25c
> >>>>>    exynos_drm_bind+0x104/0x1bc
> >>>>>    try_to_bring_up_master+0x164/0x1d0
> >>>>>    __component_add+0xa8/0x174
> >>>>>    component_add+0x14/0x20
> >>>>>    hdmi_probe+0x438/0x710
> >>>>>    platform_probe+0x68/0xe0
> >>>>>    really_probe.part.0+0x9c/0x31c
> >>>>>    __driver_probe_device+0x98/0x144
> >>>>>    driver_probe_device+0xc8/0x160
> >>>>>    __device_attach_driver+0xb8/0x120
> >>>>>    bus_for_each_drv+0x78/0xd0
> >>>>>    __device_attach+0xd8/0x180
> >>>>>    device_initial_probe+0x14/0x20
> >>>>>    bus_probe_device+0x9c/0xa4
> >>>>>    deferred_probe_work_func+0x88/0xc4
> >>>>>    process_one_work+0x288/0x6f0
> >>>>>    worker_thread+0x74/0x470
> >>>>>    kthread+0x188/0x194
> >>>>>    ret_from_fork+0x10/0x20
> >>>>> Code: 11002042 f9481c61 531e7442 8b020021 (88dffc21)
> >>>>> ---[ end trace d73aff585b108954 ]---
> >>>>> Kernel panic - not syncing: synchronous external abort: Fatal
> >>>>> exception
> >>>>> SMP: stopping secondary CPUs
> >>>>> Kernel Offset: disabled
> >>>>> CPU features: 0x2,300071c2,00000846
> >>>>> Memory Limit: none
> >>>>> ---[ end Kernel panic - not syncing: synchronous external abort:
> >>>>> Fatal
> >>>>> exception ]---
> >>>> Is this with Bridge or normal DSI panel?
> >>> Can you apply this patch and check?
> >>> https://protect2.fireeye.com/v1/url?k=aad62f08-f54d1627-aad7a447-0cc47a31cdf8-ea5858ddb7f0ecfe&q=1&e=2d730862-2c56-4988-a252-8febd02da578&u=https%3A%2F%2Fgithub.com%2Fopenedev%2Flinux%2Fcommit%2F412f226acd774356e8188c9e62b653672926ee0d
> >>>
> >> Any news on this? just asking in case if you missed it.
> >
> > It is somehow better. System doesn't crash, but the DRM is not bound:
> >
> > # cat /sys/kernel/debug/device_component/exynos-drm
> > master name                                            status
> > -------------------------------------------------------------
> > exynos-drm                                          not bound
> >
> > device name                                            status
> > -------------------------------------------------------------
> > 13800000.decon                                      not bound
> > 13880000.decon                                      not bound
> > 13930000.mic                                        not bound
> > (unknown)                                      not registered
> > (unknown)                                      not registered
> >
> Well, I also checked a much simpler case, the Samsung Trats board
> (arch/arm/boot/dts/exynos4210-trats.dts). It has only Exynos FIMD
> (CRTC), Exynos DSI (encoder) and s6e8aa0 panel. No bridges at all. With
> only the $subject patch applied I got the following errors:
>
> exynos4-fb 11c00000.fimd: Adding to iommu group 0
> OF: graph: no port node found in /soc/fimd@11c00000
> [drm] Exynos DRM: using 11c00000.fimd device for DMA mapping operations
> exynos-drm exynos-drm: bound 11c00000.fimd (ops fimd_component_ops)
> [drm:drm_bridge_attach] *ERROR* failed to attach bridge
> /soc/dsi@11c80000 to encoder TMDS-50: -22
> exynos-drm exynos-drm: failed to bind 11c80000.dsi (ops
> exynos_dsi_component_ops): -22
> exynos-drm exynos-drm: master bind failed: -22
> exynos-drm: probe of exynos-drm failed with error -22
> lima 13000000.gpu: gp - mali400 version major 1 minor 1
> lima 13000000.gpu: pp0 - mali400 version major 1 minor 1
> lima 13000000.gpu: pp1 - mali400 version major 1 minor 1
> lima 13000000.gpu: pp2 - mali400 version major 1 minor 1
> lima 13000000.gpu: pp3 - mali400 version major 1 minor 1
> lima 13000000.gpu: l2 cache 128K, 4-way, 64byte cache line, 64bit
> external bus
> lima 13000000.gpu: bus rate = 200000000
> lima 13000000.gpu: mod rate = 100000000
> lima 13000000.gpu: dev_pm_opp_set_regulators: no regulator (mali) found: -19
> [drm] Initialized lima 1.1.0 20191231 for 13000000.gpu on minor 0
>
>
> After applying "drm: exynos: dsi: Add component only once DSI device
> attached" the Exynos DRM is not even tried to bind:
>
> # dmesg | grep drm
> [    2.495898] [drm] Initialized lima 1.1.0 20191231 for 13000000.gpu on
> minor 0

Can you confirm, does linux-next work with panel, downstream bridge devices?

downstream bridge has, panel-simple out port (I2C based and non-I2C)

Thanks,
Jagan.

Re: [PATCH 1/2] drm: exynos: dsi: Convert to bridge driver

[Marek Szyprowski]

Hi Jagan,

On 24.11.2021 06:32, Jagan Teki wrote:
> On Mon, Nov 22, 2021 at 9:34 PM Marek Szyprowski
> <m.szyprowski@samsung.com> wrote:
>> On 22.11.2021 16:07, Marek Szyprowski wrote:
>>> On 22.11.2021 15:55, Jagan Teki wrote:
>>>> On Mon, Nov 22, 2021 at 7:59 PM Jagan Teki
>>>> <jagan@amarulasolutions.com> wrote:
>>>>> On Mon, Nov 22, 2021 at 7:51 PM Jagan Teki
>>>>> <jagan@amarulasolutions.com> wrote:
>>>>>> On Mon, Nov 22, 2021 at 7:45 PM Marek Szyprowski
>>>>>> <m.szyprowski@samsung.com> wrote:
>>>>>>> On 22.11.2021 08:06, Jagan Teki wrote:
>>>>>>>> Some display panels would come up with a non-DSI output, those
>>>>>>>> can have an option to connect the DSI host by means of interface
>>>>>>>> bridge converter.
>>>>>>>>
>>>>>>>> This DSI to non-DSI interface bridge converter would requires
>>>>>>>> DSI Host to handle drm bridge functionalities in order to DSI
>>>>>>>> Host to Interface bridge.
>>>>>>>>
>>>>>>>> This patch convert the existing to a drm bridge driver with a
>>>>>>>> built-in encoder support for compatibility with existing
>>>>>>>> component drivers.
>>>>>>>>
>>>>>>>> Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
>>>>>>>> ---
>>>>>>>> Note:
>>>>>>>> Hi Marek Szyprowski,
>>>>>>>>
>>>>>>>> Please test this on Panel and Bridge hardware.
>>>>>>> I don't have good news, t crashes:
>>>>>>>
>>>>>>> [drm] Exynos DRM: using 13800000.decon device for DMA mapping
>>>>>>> operations
>>>>>>> exynos-drm exynos-drm: bound 13800000.decon (ops decon_component_ops)
>>>>>>> exynos-drm exynos-drm: bound 13880000.decon (ops decon_component_ops)
>>>>>>> exynos-drm exynos-drm: bound 13930000.mic (ops
>>>>>>> exynos_mic_component_ops)
>>>>>>> [drm:drm_bridge_attach] *ERROR* failed to attach bridge
>>>>>>> /soc@0/dsi@13900000 to encoder TMDS-67: -22
>>>>>>> exynos-drm exynos-drm: failed to bind 13900000.dsi (ops
>>>>>>> exynos_dsi_component_ops): -22
>>>>>>> Internal error: synchronous external abort: 96000210 [#1] PREEMPT SMP
>>>>>>> Modules linked in:
>>>>>>> CPU: 2 PID: 74 Comm: kworker/u16:1 Not tainted 5.16.0-rc1+ #4141
>>>>>>> Hardware name: Samsung TM2E board (DT)
>>>>>>> Workqueue: events_unbound deferred_probe_work_func
>>>>>>> pstate: 80000005 (Nzcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
>>>>>>> pc : decon_atomic_disable+0x58/0xd4
>>>>>>> lr : decon_atomic_disable+0x28/0xd4
>>>>>>> sp : ffff80001390b940
>>>>>>> x29: ffff80001390b940 x28: ffff80001259a000 x27: ffff000027f39e80
>>>>>>> input: stmfts as
>>>>>>> /devices/platform/soc@0/14ed0000.hsi2c/i2c-3/3-0049/input/input0
>>>>>>> x26: 00000000ffffffea x25: ffff000025a40280 x24: 0000000000000001
>>>>>>> x23: ffff800011b55f98 x22: ffff0000315dc000 x21: ffff00002695d100
>>>>>>> x20: ffff000027e7a080 x19: ffff0000315e6000 x18: 0000000000000000
>>>>>>> x17: 645f736f6e797865 x16: 2073706f28206973 x15: 0000000000028ee0
>>>>>>> x14: 0000000000000028 x13: 0000000000000001 x12: 0000000000000040
>>>>>>> x11: ffff000023c18920 x10: ffff000023c18922 x9 : ffff8000126352f0
>>>>>>> x8 : ffff000023c00270 x7 : 0000000000000000 x6 : ffff000023c00268
>>>>>>> x5 : ffff000027e7a3a0 x4 : 0000000000000001 x3 : ffff000027e7a080
>>>>>>> x2 : 0000000000000024 x1 : ffff800013bc8024 x0 : ffff0000246117c0
>>>>>>> Call trace:
>>>>>>>     decon_atomic_disable+0x58/0xd4
>>>>>>>     decon_unbind+0x1c/0x3c
>>>>>>>     component_unbind+0x38/0x60
>>>>>>>     component_bind_all+0x16c/0x25c
>>>>>>>     exynos_drm_bind+0x104/0x1bc
>>>>>>>     try_to_bring_up_master+0x164/0x1d0
>>>>>>>     __component_add+0xa8/0x174
>>>>>>>     component_add+0x14/0x20
>>>>>>>     hdmi_probe+0x438/0x710
>>>>>>>     platform_probe+0x68/0xe0
>>>>>>>     really_probe.part.0+0x9c/0x31c
>>>>>>>     __driver_probe_device+0x98/0x144
>>>>>>>     driver_probe_device+0xc8/0x160
>>>>>>>     __device_attach_driver+0xb8/0x120
>>>>>>>     bus_for_each_drv+0x78/0xd0
>>>>>>>     __device_attach+0xd8/0x180
>>>>>>>     device_initial_probe+0x14/0x20
>>>>>>>     bus_probe_device+0x9c/0xa4
>>>>>>>     deferred_probe_work_func+0x88/0xc4
>>>>>>>     process_one_work+0x288/0x6f0
>>>>>>>     worker_thread+0x74/0x470
>>>>>>>     kthread+0x188/0x194
>>>>>>>     ret_from_fork+0x10/0x20
>>>>>>> Code: 11002042 f9481c61 531e7442 8b020021 (88dffc21)
>>>>>>> ---[ end trace d73aff585b108954 ]---
>>>>>>> Kernel panic - not syncing: synchronous external abort: Fatal
>>>>>>> exception
>>>>>>> SMP: stopping secondary CPUs
>>>>>>> Kernel Offset: disabled
>>>>>>> CPU features: 0x2,300071c2,00000846
>>>>>>> Memory Limit: none
>>>>>>> ---[ end Kernel panic - not syncing: synchronous external abort:
>>>>>>> Fatal
>>>>>>> exception ]---
>>>>>> Is this with Bridge or normal DSI panel?
>>>>> Can you apply this patch and check?
>>>>> https://protect2.fireeye.com/v1/url?k=aad62f08-f54d1627-aad7a447-0cc47a31cdf8-ea5858ddb7f0ecfe&q=1&e=2d730862-2c56-4988-a252-8febd02da578&u=https%3A%2F%2Fgithub.com%2Fopenedev%2Flinux%2Fcommit%2F412f226acd774356e8188c9e62b653672926ee0d
>>>>>
>>>> Any news on this? just asking in case if you missed it.
>>> It is somehow better. System doesn't crash, but the DRM is not bound:
>>>
>>> # cat /sys/kernel/debug/device_component/exynos-drm
>>> master name                                            status
>>> -------------------------------------------------------------
>>> exynos-drm                                          not bound
>>>
>>> device name                                            status
>>> -------------------------------------------------------------
>>> 13800000.decon                                      not bound
>>> 13880000.decon                                      not bound
>>> 13930000.mic                                        not bound
>>> (unknown)                                      not registered
>>> (unknown)                                      not registered
>>>
>> Well, I also checked a much simpler case, the Samsung Trats board
>> (arch/arm/boot/dts/exynos4210-trats.dts). It has only Exynos FIMD
>> (CRTC), Exynos DSI (encoder) and s6e8aa0 panel. No bridges at all. With
>> only the $subject patch applied I got the following errors:
>>
>> exynos4-fb 11c00000.fimd: Adding to iommu group 0
>> OF: graph: no port node found in /soc/fimd@11c00000
>> [drm] Exynos DRM: using 11c00000.fimd device for DMA mapping operations
>> exynos-drm exynos-drm: bound 11c00000.fimd (ops fimd_component_ops)
>> [drm:drm_bridge_attach] *ERROR* failed to attach bridge
>> /soc/dsi@11c80000 to encoder TMDS-50: -22
>> exynos-drm exynos-drm: failed to bind 11c80000.dsi (ops
>> exynos_dsi_component_ops): -22
>> exynos-drm exynos-drm: master bind failed: -22
>> exynos-drm: probe of exynos-drm failed with error -22
>> lima 13000000.gpu: gp - mali400 version major 1 minor 1
>> lima 13000000.gpu: pp0 - mali400 version major 1 minor 1
>> lima 13000000.gpu: pp1 - mali400 version major 1 minor 1
>> lima 13000000.gpu: pp2 - mali400 version major 1 minor 1
>> lima 13000000.gpu: pp3 - mali400 version major 1 minor 1
>> lima 13000000.gpu: l2 cache 128K, 4-way, 64byte cache line, 64bit
>> external bus
>> lima 13000000.gpu: bus rate = 200000000
>> lima 13000000.gpu: mod rate = 100000000
>> lima 13000000.gpu: dev_pm_opp_set_regulators: no regulator (mali) found: -19
>> [drm] Initialized lima 1.1.0 20191231 for 13000000.gpu on minor 0
>>
>>
>> After applying "drm: exynos: dsi: Add component only once DSI device
>> attached" the Exynos DRM is not even tried to bind:
>>
>> # dmesg | grep drm
>> [    2.495898] [drm] Initialized lima 1.1.0 20191231 for 13000000.gpu on
>> minor 0
> Can you confirm, does linux-next work with panel, downstream bridge devices?
>
> downstream bridge has, panel-simple out port (I2C based and non-I2C)

What do you mean by downstream bridge devices?

I've just checked and two mentioned in this thread boards: TM2e and 
Trats properly display image with current (20211124) linux-next.

However I've noticed that the Arndale board 
(arch/arm/boot/dts/exynos5250-arndale.dts), which also uses Exynos DSI 
with some bridges, gives no display with current next. I will try to 
bisect and find when it got broken.

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland

Re: [PATCH 1/2] drm: exynos: dsi: Convert to bridge driver

[Jagan Teki]

Hi Marek,

On Wed, Nov 24, 2021 at 8:23 PM Marek Szyprowski
<m.szyprowski@samsung.com> wrote:
>
> Hi Jagan,
>
> On 24.11.2021 06:32, Jagan Teki wrote:
> > On Mon, Nov 22, 2021 at 9:34 PM Marek Szyprowski
> > <m.szyprowski@samsung.com> wrote:
> >> On 22.11.2021 16:07, Marek Szyprowski wrote:
> >>> On 22.11.2021 15:55, Jagan Teki wrote:
> >>>> On Mon, Nov 22, 2021 at 7:59 PM Jagan Teki
> >>>> <jagan@amarulasolutions.com> wrote:
> >>>>> On Mon, Nov 22, 2021 at 7:51 PM Jagan Teki
> >>>>> <jagan@amarulasolutions.com> wrote:
> >>>>>> On Mon, Nov 22, 2021 at 7:45 PM Marek Szyprowski
> >>>>>> <m.szyprowski@samsung.com> wrote:
> >>>>>>> On 22.11.2021 08:06, Jagan Teki wrote:
> >>>>>>>> Some display panels would come up with a non-DSI output, those
> >>>>>>>> can have an option to connect the DSI host by means of interface
> >>>>>>>> bridge converter.
> >>>>>>>>
> >>>>>>>> This DSI to non-DSI interface bridge converter would requires
> >>>>>>>> DSI Host to handle drm bridge functionalities in order to DSI
> >>>>>>>> Host to Interface bridge.
> >>>>>>>>
> >>>>>>>> This patch convert the existing to a drm bridge driver with a
> >>>>>>>> built-in encoder support for compatibility with existing
> >>>>>>>> component drivers.
> >>>>>>>>
> >>>>>>>> Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
> >>>>>>>> ---
> >>>>>>>> Note:
> >>>>>>>> Hi Marek Szyprowski,
> >>>>>>>>
> >>>>>>>> Please test this on Panel and Bridge hardware.
> >>>>>>> I don't have good news, t crashes:
> >>>>>>>
> >>>>>>> [drm] Exynos DRM: using 13800000.decon device for DMA mapping
> >>>>>>> operations
> >>>>>>> exynos-drm exynos-drm: bound 13800000.decon (ops decon_component_ops)
> >>>>>>> exynos-drm exynos-drm: bound 13880000.decon (ops decon_component_ops)
> >>>>>>> exynos-drm exynos-drm: bound 13930000.mic (ops
> >>>>>>> exynos_mic_component_ops)
> >>>>>>> [drm:drm_bridge_attach] *ERROR* failed to attach bridge
> >>>>>>> /soc@0/dsi@13900000 to encoder TMDS-67: -22
> >>>>>>> exynos-drm exynos-drm: failed to bind 13900000.dsi (ops
> >>>>>>> exynos_dsi_component_ops): -22
> >>>>>>> Internal error: synchronous external abort: 96000210 [#1] PREEMPT SMP
> >>>>>>> Modules linked in:
> >>>>>>> CPU: 2 PID: 74 Comm: kworker/u16:1 Not tainted 5.16.0-rc1+ #4141
> >>>>>>> Hardware name: Samsung TM2E board (DT)
> >>>>>>> Workqueue: events_unbound deferred_probe_work_func
> >>>>>>> pstate: 80000005 (Nzcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> >>>>>>> pc : decon_atomic_disable+0x58/0xd4
> >>>>>>> lr : decon_atomic_disable+0x28/0xd4
> >>>>>>> sp : ffff80001390b940
> >>>>>>> x29: ffff80001390b940 x28: ffff80001259a000 x27: ffff000027f39e80
> >>>>>>> input: stmfts as
> >>>>>>> /devices/platform/soc@0/14ed0000.hsi2c/i2c-3/3-0049/input/input0
> >>>>>>> x26: 00000000ffffffea x25: ffff000025a40280 x24: 0000000000000001
> >>>>>>> x23: ffff800011b55f98 x22: ffff0000315dc000 x21: ffff00002695d100
> >>>>>>> x20: ffff000027e7a080 x19: ffff0000315e6000 x18: 0000000000000000
> >>>>>>> x17: 645f736f6e797865 x16: 2073706f28206973 x15: 0000000000028ee0
> >>>>>>> x14: 0000000000000028 x13: 0000000000000001 x12: 0000000000000040
> >>>>>>> x11: ffff000023c18920 x10: ffff000023c18922 x9 : ffff8000126352f0
> >>>>>>> x8 : ffff000023c00270 x7 : 0000000000000000 x6 : ffff000023c00268
> >>>>>>> x5 : ffff000027e7a3a0 x4 : 0000000000000001 x3 : ffff000027e7a080
> >>>>>>> x2 : 0000000000000024 x1 : ffff800013bc8024 x0 : ffff0000246117c0
> >>>>>>> Call trace:
> >>>>>>>     decon_atomic_disable+0x58/0xd4
> >>>>>>>     decon_unbind+0x1c/0x3c
> >>>>>>>     component_unbind+0x38/0x60
> >>>>>>>     component_bind_all+0x16c/0x25c
> >>>>>>>     exynos_drm_bind+0x104/0x1bc
> >>>>>>>     try_to_bring_up_master+0x164/0x1d0
> >>>>>>>     __component_add+0xa8/0x174
> >>>>>>>     component_add+0x14/0x20
> >>>>>>>     hdmi_probe+0x438/0x710
> >>>>>>>     platform_probe+0x68/0xe0
> >>>>>>>     really_probe.part.0+0x9c/0x31c
> >>>>>>>     __driver_probe_device+0x98/0x144
> >>>>>>>     driver_probe_device+0xc8/0x160
> >>>>>>>     __device_attach_driver+0xb8/0x120
> >>>>>>>     bus_for_each_drv+0x78/0xd0
> >>>>>>>     __device_attach+0xd8/0x180
> >>>>>>>     device_initial_probe+0x14/0x20
> >>>>>>>     bus_probe_device+0x9c/0xa4
> >>>>>>>     deferred_probe_work_func+0x88/0xc4
> >>>>>>>     process_one_work+0x288/0x6f0
> >>>>>>>     worker_thread+0x74/0x470
> >>>>>>>     kthread+0x188/0x194
> >>>>>>>     ret_from_fork+0x10/0x20
> >>>>>>> Code: 11002042 f9481c61 531e7442 8b020021 (88dffc21)
> >>>>>>> ---[ end trace d73aff585b108954 ]---
> >>>>>>> Kernel panic - not syncing: synchronous external abort: Fatal
> >>>>>>> exception
> >>>>>>> SMP: stopping secondary CPUs
> >>>>>>> Kernel Offset: disabled
> >>>>>>> CPU features: 0x2,300071c2,00000846
> >>>>>>> Memory Limit: none
> >>>>>>> ---[ end Kernel panic - not syncing: synchronous external abort:
> >>>>>>> Fatal
> >>>>>>> exception ]---
> >>>>>> Is this with Bridge or normal DSI panel?
> >>>>> Can you apply this patch and check?
> >>>>> https://protect2.fireeye.com/v1/url?k=aad62f08-f54d1627-aad7a447-0cc47a31cdf8-ea5858ddb7f0ecfe&q=1&e=2d730862-2c56-4988-a252-8febd02da578&u=https%3A%2F%2Fgithub.com%2Fopenedev%2Flinux%2Fcommit%2F412f226acd774356e8188c9e62b653672926ee0d
> >>>>>
> >>>> Any news on this? just asking in case if you missed it.
> >>> It is somehow better. System doesn't crash, but the DRM is not bound:
> >>>
> >>> # cat /sys/kernel/debug/device_component/exynos-drm
> >>> master name                                            status
> >>> -------------------------------------------------------------
> >>> exynos-drm                                          not bound
> >>>
> >>> device name                                            status
> >>> -------------------------------------------------------------
> >>> 13800000.decon                                      not bound
> >>> 13880000.decon                                      not bound
> >>> 13930000.mic                                        not bound
> >>> (unknown)                                      not registered
> >>> (unknown)                                      not registered
> >>>
> >> Well, I also checked a much simpler case, the Samsung Trats board
> >> (arch/arm/boot/dts/exynos4210-trats.dts). It has only Exynos FIMD
> >> (CRTC), Exynos DSI (encoder) and s6e8aa0 panel. No bridges at all. With
> >> only the $subject patch applied I got the following errors:
> >>
> >> exynos4-fb 11c00000.fimd: Adding to iommu group 0
> >> OF: graph: no port node found in /soc/fimd@11c00000
> >> [drm] Exynos DRM: using 11c00000.fimd device for DMA mapping operations
> >> exynos-drm exynos-drm: bound 11c00000.fimd (ops fimd_component_ops)
> >> [drm:drm_bridge_attach] *ERROR* failed to attach bridge
> >> /soc/dsi@11c80000 to encoder TMDS-50: -22
> >> exynos-drm exynos-drm: failed to bind 11c80000.dsi (ops
> >> exynos_dsi_component_ops): -22
> >> exynos-drm exynos-drm: master bind failed: -22
> >> exynos-drm: probe of exynos-drm failed with error -22
> >> lima 13000000.gpu: gp - mali400 version major 1 minor 1
> >> lima 13000000.gpu: pp0 - mali400 version major 1 minor 1
> >> lima 13000000.gpu: pp1 - mali400 version major 1 minor 1
> >> lima 13000000.gpu: pp2 - mali400 version major 1 minor 1
> >> lima 13000000.gpu: pp3 - mali400 version major 1 minor 1
> >> lima 13000000.gpu: l2 cache 128K, 4-way, 64byte cache line, 64bit
> >> external bus
> >> lima 13000000.gpu: bus rate = 200000000
> >> lima 13000000.gpu: mod rate = 100000000
> >> lima 13000000.gpu: dev_pm_opp_set_regulators: no regulator (mali) found: -19
> >> [drm] Initialized lima 1.1.0 20191231 for 13000000.gpu on minor 0
> >>
> >>
> >> After applying "drm: exynos: dsi: Add component only once DSI device
> >> attached" the Exynos DRM is not even tried to bind:
> >>
> >> # dmesg | grep drm
> >> [    2.495898] [drm] Initialized lima 1.1.0 20191231 for 13000000.gpu on
> >> minor 0
> > Can you confirm, does linux-next work with panel, downstream bridge devices?
> >
> > downstream bridge has, panel-simple out port (I2C based and non-I2C)
>
> What do you mean by downstream bridge devices?

Bridge devices connected from Exynos Host.

>
> I've just checked and two mentioned in this thread boards: TM2e and
> Trats properly display image with current (20211124) linux-next.
>
> However I've noticed that the Arndale board
> (arch/arm/boot/dts/exynos5250-arndale.dts), which also uses Exynos DSI
> with some bridges, gives no display with current next. I will try to
> bisect and find when it got broken.

I understand why it is broken. Would you please come irc for further
discussion on this?
#dri-devel
jagan_

Thaks,
Jagan.

Re: [PATCH 1/2] drm: exynos: dsi: Convert to bridge driver

[Jagan Teki]

Hi Robert,

On Mon, Nov 22, 2021 at 9:34 PM Marek Szyprowski
<m.szyprowski@samsung.com> wrote:
>
> On 22.11.2021 16:07, Marek Szyprowski wrote:
> > On 22.11.2021 15:55, Jagan Teki wrote:
> >> On Mon, Nov 22, 2021 at 7:59 PM Jagan Teki
> >> <jagan@amarulasolutions.com> wrote:
> >>> On Mon, Nov 22, 2021 at 7:51 PM Jagan Teki
> >>> <jagan@amarulasolutions.com> wrote:
> >>>> On Mon, Nov 22, 2021 at 7:45 PM Marek Szyprowski
> >>>> <m.szyprowski@samsung.com> wrote:
> >>>>> On 22.11.2021 08:06, Jagan Teki wrote:
> >>>>>> Some display panels would come up with a non-DSI output, those
> >>>>>> can have an option to connect the DSI host by means of interface
> >>>>>> bridge converter.
> >>>>>>
> >>>>>> This DSI to non-DSI interface bridge converter would requires
> >>>>>> DSI Host to handle drm bridge functionalities in order to DSI
> >>>>>> Host to Interface bridge.
> >>>>>>
> >>>>>> This patch convert the existing to a drm bridge driver with a
> >>>>>> built-in encoder support for compatibility with existing
> >>>>>> component drivers.
> >>>>>>
> >>>>>> Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
> >>>>>> ---
> >>>>>> Note:
> >>>>>> Hi Marek Szyprowski,
> >>>>>>
> >>>>>> Please test this on Panel and Bridge hardware.
> >>>>> I don't have good news, t crashes:
> >>>>>
> >>>>> [drm] Exynos DRM: using 13800000.decon device for DMA mapping
> >>>>> operations
> >>>>> exynos-drm exynos-drm: bound 13800000.decon (ops decon_component_ops)
> >>>>> exynos-drm exynos-drm: bound 13880000.decon (ops decon_component_ops)
> >>>>> exynos-drm exynos-drm: bound 13930000.mic (ops
> >>>>> exynos_mic_component_ops)
> >>>>> [drm:drm_bridge_attach] *ERROR* failed to attach bridge
> >>>>> /soc@0/dsi@13900000 to encoder TMDS-67: -22
> >>>>> exynos-drm exynos-drm: failed to bind 13900000.dsi (ops
> >>>>> exynos_dsi_component_ops): -22
> >>>>> Internal error: synchronous external abort: 96000210 [#1] PREEMPT SMP
> >>>>> Modules linked in:
> >>>>> CPU: 2 PID: 74 Comm: kworker/u16:1 Not tainted 5.16.0-rc1+ #4141
> >>>>> Hardware name: Samsung TM2E board (DT)
> >>>>> Workqueue: events_unbound deferred_probe_work_func
> >>>>> pstate: 80000005 (Nzcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> >>>>> pc : decon_atomic_disable+0x58/0xd4
> >>>>> lr : decon_atomic_disable+0x28/0xd4
> >>>>> sp : ffff80001390b940
> >>>>> x29: ffff80001390b940 x28: ffff80001259a000 x27: ffff000027f39e80
> >>>>> input: stmfts as
> >>>>> /devices/platform/soc@0/14ed0000.hsi2c/i2c-3/3-0049/input/input0
> >>>>> x26: 00000000ffffffea x25: ffff000025a40280 x24: 0000000000000001
> >>>>> x23: ffff800011b55f98 x22: ffff0000315dc000 x21: ffff00002695d100
> >>>>> x20: ffff000027e7a080 x19: ffff0000315e6000 x18: 0000000000000000
> >>>>> x17: 645f736f6e797865 x16: 2073706f28206973 x15: 0000000000028ee0
> >>>>> x14: 0000000000000028 x13: 0000000000000001 x12: 0000000000000040
> >>>>> x11: ffff000023c18920 x10: ffff000023c18922 x9 : ffff8000126352f0
> >>>>> x8 : ffff000023c00270 x7 : 0000000000000000 x6 : ffff000023c00268
> >>>>> x5 : ffff000027e7a3a0 x4 : 0000000000000001 x3 : ffff000027e7a080
> >>>>> x2 : 0000000000000024 x1 : ffff800013bc8024 x0 : ffff0000246117c0
> >>>>> Call trace:
> >>>>>    decon_atomic_disable+0x58/0xd4
> >>>>>    decon_unbind+0x1c/0x3c
> >>>>>    component_unbind+0x38/0x60
> >>>>>    component_bind_all+0x16c/0x25c
> >>>>>    exynos_drm_bind+0x104/0x1bc
> >>>>>    try_to_bring_up_master+0x164/0x1d0
> >>>>>    __component_add+0xa8/0x174
> >>>>>    component_add+0x14/0x20
> >>>>>    hdmi_probe+0x438/0x710
> >>>>>    platform_probe+0x68/0xe0
> >>>>>    really_probe.part.0+0x9c/0x31c
> >>>>>    __driver_probe_device+0x98/0x144
> >>>>>    driver_probe_device+0xc8/0x160
> >>>>>    __device_attach_driver+0xb8/0x120
> >>>>>    bus_for_each_drv+0x78/0xd0
> >>>>>    __device_attach+0xd8/0x180
> >>>>>    device_initial_probe+0x14/0x20
> >>>>>    bus_probe_device+0x9c/0xa4
> >>>>>    deferred_probe_work_func+0x88/0xc4
> >>>>>    process_one_work+0x288/0x6f0
> >>>>>    worker_thread+0x74/0x470
> >>>>>    kthread+0x188/0x194
> >>>>>    ret_from_fork+0x10/0x20
> >>>>> Code: 11002042 f9481c61 531e7442 8b020021 (88dffc21)
> >>>>> ---[ end trace d73aff585b108954 ]---
> >>>>> Kernel panic - not syncing: synchronous external abort: Fatal
> >>>>> exception
> >>>>> SMP: stopping secondary CPUs
> >>>>> Kernel Offset: disabled
> >>>>> CPU features: 0x2,300071c2,00000846
> >>>>> Memory Limit: none
> >>>>> ---[ end Kernel panic - not syncing: synchronous external abort:
> >>>>> Fatal
> >>>>> exception ]---
> >>>> Is this with Bridge or normal DSI panel?
> >>> Can you apply this patch and check?
> >>> https://protect2.fireeye.com/v1/url?k=aad62f08-f54d1627-aad7a447-0cc47a31cdf8-ea5858ddb7f0ecfe&q=1&e=2d730862-2c56-4988-a252-8febd02da578&u=https%3A%2F%2Fgithub.com%2Fopenedev%2Flinux%2Fcommit%2F412f226acd774356e8188c9e62b653672926ee0d
> >>>
> >> Any news on this? just asking in case if you missed it.
> >
> > It is somehow better. System doesn't crash, but the DRM is not bound:
> >
> > # cat /sys/kernel/debug/device_component/exynos-drm
> > master name                                            status
> > -------------------------------------------------------------
> > exynos-drm                                          not bound
> >
> > device name                                            status
> > -------------------------------------------------------------
> > 13800000.decon                                      not bound
> > 13880000.decon                                      not bound
> > 13930000.mic                                        not bound
> > (unknown)                                      not registered
> > (unknown)                                      not registered
> >
> Well, I also checked a much simpler case, the Samsung Trats board
> (arch/arm/boot/dts/exynos4210-trats.dts). It has only Exynos FIMD
> (CRTC), Exynos DSI (encoder) and s6e8aa0 panel. No bridges at all. With
> only the $subject patch applied I got the following errors:
>
> exynos4-fb 11c00000.fimd: Adding to iommu group 0
> OF: graph: no port node found in /soc/fimd@11c00000
> [drm] Exynos DRM: using 11c00000.fimd device for DMA mapping operations
> exynos-drm exynos-drm: bound 11c00000.fimd (ops fimd_component_ops)
> [drm:drm_bridge_attach] *ERROR* failed to attach bridge
> /soc/dsi@11c80000 to encoder TMDS-50: -22
> exynos-drm exynos-drm: failed to bind 11c80000.dsi (ops
> exynos_dsi_component_ops): -22
> exynos-drm exynos-drm: master bind failed: -22
> exynos-drm: probe of exynos-drm failed with error -22
> lima 13000000.gpu: gp - mali400 version major 1 minor 1
> lima 13000000.gpu: pp0 - mali400 version major 1 minor 1
> lima 13000000.gpu: pp1 - mali400 version major 1 minor 1
> lima 13000000.gpu: pp2 - mali400 version major 1 minor 1
> lima 13000000.gpu: pp3 - mali400 version major 1 minor 1
> lima 13000000.gpu: l2 cache 128K, 4-way, 64byte cache line, 64bit
> external bus
> lima 13000000.gpu: bus rate = 200000000
> lima 13000000.gpu: mod rate = 100000000
> lima 13000000.gpu: dev_pm_opp_set_regulators: no regulator (mali) found: -19
> [drm] Initialized lima 1.1.0 20191231 for 13000000.gpu on minor 0
>
>
> After applying "drm: exynos: dsi: Add component only once DSI device
> attached" the Exynos DRM is not even tried to bind:
>
> # dmesg | grep drm
> [    2.495898] [drm] Initialized lima 1.1.0 20191231 for 13000000.gpu on
> minor 0

I can see this patch is merged in drm-misc [1], not sure why? because
we are in v4 of this series[2] and this patch certainly broke the
exynos DSI  Let me know what I need to do for next version to send-up?

[1] https://cgit.freedesktop.org/drm/drm-misc/commit/?id=92e794fab87af0793403d5e4a547f0be94a0e656
[2] https://patchwork.kernel.org/project/dri-devel/cover/20211215101534.45003-1-jagan@amarulasolutions.com/

Thanks,
Jagan.

Re: [PATCH 1/2] drm: exynos: dsi: Convert to bridge driver

[Robert Foss]

Hey Jagan,

This is a mistake on my end, I must have been looking at reviewing
this series and then accidentally included it with another batch of
patches. Thank you for catching this.

I would suggest reverting these two patches[1][2]. Is that ok with you?

[1] https://cgit.freedesktop.org/drm/drm-misc/commit/?id=92e794fab87af0793403d5e4a547f0be94a0e656
[2] https://cgit.freedesktop.org/drm/drm-misc/commit/?id=aee039e66035b66f0c587cc1b0dd32fb04c9a892


On Mon, 10 Jan 2022 at 12:17, Jagan Teki <jagan@amarulasolutions.com> wrote:
>
> Hi Robert,
>
> On Mon, Nov 22, 2021 at 9:34 PM Marek Szyprowski
> <m.szyprowski@samsung.com> wrote:
> >
> > On 22.11.2021 16:07, Marek Szyprowski wrote:
> > > On 22.11.2021 15:55, Jagan Teki wrote:
> > >> On Mon, Nov 22, 2021 at 7:59 PM Jagan Teki
> > >> <jagan@amarulasolutions.com> wrote:
> > >>> On Mon, Nov 22, 2021 at 7:51 PM Jagan Teki
> > >>> <jagan@amarulasolutions.com> wrote:
> > >>>> On Mon, Nov 22, 2021 at 7:45 PM Marek Szyprowski
> > >>>> <m.szyprowski@samsung.com> wrote:
> > >>>>> On 22.11.2021 08:06, Jagan Teki wrote:
> > >>>>>> Some display panels would come up with a non-DSI output, those
> > >>>>>> can have an option to connect the DSI host by means of interface
> > >>>>>> bridge converter.
> > >>>>>>
> > >>>>>> This DSI to non-DSI interface bridge converter would requires
> > >>>>>> DSI Host to handle drm bridge functionalities in order to DSI
> > >>>>>> Host to Interface bridge.
> > >>>>>>
> > >>>>>> This patch convert the existing to a drm bridge driver with a
> > >>>>>> built-in encoder support for compatibility with existing
> > >>>>>> component drivers.
> > >>>>>>
> > >>>>>> Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
> > >>>>>> ---
> > >>>>>> Note:
> > >>>>>> Hi Marek Szyprowski,
> > >>>>>>
> > >>>>>> Please test this on Panel and Bridge hardware.
> > >>>>> I don't have good news, t crashes:
> > >>>>>
> > >>>>> [drm] Exynos DRM: using 13800000.decon device for DMA mapping
> > >>>>> operations
> > >>>>> exynos-drm exynos-drm: bound 13800000.decon (ops decon_component_ops)
> > >>>>> exynos-drm exynos-drm: bound 13880000.decon (ops decon_component_ops)
> > >>>>> exynos-drm exynos-drm: bound 13930000.mic (ops
> > >>>>> exynos_mic_component_ops)
> > >>>>> [drm:drm_bridge_attach] *ERROR* failed to attach bridge
> > >>>>> /soc@0/dsi@13900000 to encoder TMDS-67: -22
> > >>>>> exynos-drm exynos-drm: failed to bind 13900000.dsi (ops
> > >>>>> exynos_dsi_component_ops): -22
> > >>>>> Internal error: synchronous external abort: 96000210 [#1] PREEMPT SMP
> > >>>>> Modules linked in:
> > >>>>> CPU: 2 PID: 74 Comm: kworker/u16:1 Not tainted 5.16.0-rc1+ #4141
> > >>>>> Hardware name: Samsung TM2E board (DT)
> > >>>>> Workqueue: events_unbound deferred_probe_work_func
> > >>>>> pstate: 80000005 (Nzcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> > >>>>> pc : decon_atomic_disable+0x58/0xd4
> > >>>>> lr : decon_atomic_disable+0x28/0xd4
> > >>>>> sp : ffff80001390b940
> > >>>>> x29: ffff80001390b940 x28: ffff80001259a000 x27: ffff000027f39e80
> > >>>>> input: stmfts as
> > >>>>> /devices/platform/soc@0/14ed0000.hsi2c/i2c-3/3-0049/input/input0
> > >>>>> x26: 00000000ffffffea x25: ffff000025a40280 x24: 0000000000000001
> > >>>>> x23: ffff800011b55f98 x22: ffff0000315dc000 x21: ffff00002695d100
> > >>>>> x20: ffff000027e7a080 x19: ffff0000315e6000 x18: 0000000000000000
> > >>>>> x17: 645f736f6e797865 x16: 2073706f28206973 x15: 0000000000028ee0
> > >>>>> x14: 0000000000000028 x13: 0000000000000001 x12: 0000000000000040
> > >>>>> x11: ffff000023c18920 x10: ffff000023c18922 x9 : ffff8000126352f0
> > >>>>> x8 : ffff000023c00270 x7 : 0000000000000000 x6 : ffff000023c00268
> > >>>>> x5 : ffff000027e7a3a0 x4 : 0000000000000001 x3 : ffff000027e7a080
> > >>>>> x2 : 0000000000000024 x1 : ffff800013bc8024 x0 : ffff0000246117c0
> > >>>>> Call trace:
> > >>>>>    decon_atomic_disable+0x58/0xd4
> > >>>>>    decon_unbind+0x1c/0x3c
> > >>>>>    component_unbind+0x38/0x60
> > >>>>>    component_bind_all+0x16c/0x25c
> > >>>>>    exynos_drm_bind+0x104/0x1bc
> > >>>>>    try_to_bring_up_master+0x164/0x1d0
> > >>>>>    __component_add+0xa8/0x174
> > >>>>>    component_add+0x14/0x20
> > >>>>>    hdmi_probe+0x438/0x710
> > >>>>>    platform_probe+0x68/0xe0
> > >>>>>    really_probe.part.0+0x9c/0x31c
> > >>>>>    __driver_probe_device+0x98/0x144
> > >>>>>    driver_probe_device+0xc8/0x160
> > >>>>>    __device_attach_driver+0xb8/0x120
> > >>>>>    bus_for_each_drv+0x78/0xd0
> > >>>>>    __device_attach+0xd8/0x180
> > >>>>>    device_initial_probe+0x14/0x20
> > >>>>>    bus_probe_device+0x9c/0xa4
> > >>>>>    deferred_probe_work_func+0x88/0xc4
> > >>>>>    process_one_work+0x288/0x6f0
> > >>>>>    worker_thread+0x74/0x470
> > >>>>>    kthread+0x188/0x194
> > >>>>>    ret_from_fork+0x10/0x20
> > >>>>> Code: 11002042 f9481c61 531e7442 8b020021 (88dffc21)
> > >>>>> ---[ end trace d73aff585b108954 ]---
> > >>>>> Kernel panic - not syncing: synchronous external abort: Fatal
> > >>>>> exception
> > >>>>> SMP: stopping secondary CPUs
> > >>>>> Kernel Offset: disabled
> > >>>>> CPU features: 0x2,300071c2,00000846
> > >>>>> Memory Limit: none
> > >>>>> ---[ end Kernel panic - not syncing: synchronous external abort:
> > >>>>> Fatal
> > >>>>> exception ]---
> > >>>> Is this with Bridge or normal DSI panel?
> > >>> Can you apply this patch and check?
> > >>> https://protect2.fireeye.com/v1/url?k=aad62f08-f54d1627-aad7a447-0cc47a31cdf8-ea5858ddb7f0ecfe&q=1&e=2d730862-2c56-4988-a252-8febd02da578&u=https%3A%2F%2Fgithub.com%2Fopenedev%2Flinux%2Fcommit%2F412f226acd774356e8188c9e62b653672926ee0d
> > >>>
> > >> Any news on this? just asking in case if you missed it.
> > >
> > > It is somehow better. System doesn't crash, but the DRM is not bound:
> > >
> > > # cat /sys/kernel/debug/device_component/exynos-drm
> > > master name                                            status
> > > -------------------------------------------------------------
> > > exynos-drm                                          not bound
> > >
> > > device name                                            status
> > > -------------------------------------------------------------
> > > 13800000.decon                                      not bound
> > > 13880000.decon                                      not bound
> > > 13930000.mic                                        not bound
> > > (unknown)                                      not registered
> > > (unknown)                                      not registered
> > >
> > Well, I also checked a much simpler case, the Samsung Trats board
> > (arch/arm/boot/dts/exynos4210-trats.dts). It has only Exynos FIMD
> > (CRTC), Exynos DSI (encoder) and s6e8aa0 panel. No bridges at all. With
> > only the $subject patch applied I got the following errors:
> >
> > exynos4-fb 11c00000.fimd: Adding to iommu group 0
> > OF: graph: no port node found in /soc/fimd@11c00000
> > [drm] Exynos DRM: using 11c00000.fimd device for DMA mapping operations
> > exynos-drm exynos-drm: bound 11c00000.fimd (ops fimd_component_ops)
> > [drm:drm_bridge_attach] *ERROR* failed to attach bridge
> > /soc/dsi@11c80000 to encoder TMDS-50: -22
> > exynos-drm exynos-drm: failed to bind 11c80000.dsi (ops
> > exynos_dsi_component_ops): -22
> > exynos-drm exynos-drm: master bind failed: -22
> > exynos-drm: probe of exynos-drm failed with error -22
> > lima 13000000.gpu: gp - mali400 version major 1 minor 1
> > lima 13000000.gpu: pp0 - mali400 version major 1 minor 1
> > lima 13000000.gpu: pp1 - mali400 version major 1 minor 1
> > lima 13000000.gpu: pp2 - mali400 version major 1 minor 1
> > lima 13000000.gpu: pp3 - mali400 version major 1 minor 1
> > lima 13000000.gpu: l2 cache 128K, 4-way, 64byte cache line, 64bit
> > external bus
> > lima 13000000.gpu: bus rate = 200000000
> > lima 13000000.gpu: mod rate = 100000000
> > lima 13000000.gpu: dev_pm_opp_set_regulators: no regulator (mali) found: -19
> > [drm] Initialized lima 1.1.0 20191231 for 13000000.gpu on minor 0
> >
> >
> > After applying "drm: exynos: dsi: Add component only once DSI device
> > attached" the Exynos DRM is not even tried to bind:
> >
> > # dmesg | grep drm
> > [    2.495898] [drm] Initialized lima 1.1.0 20191231 for 13000000.gpu on
> > minor 0
>
> I can see this patch is merged in drm-misc [1], not sure why? because
> we are in v4 of this series[2] and this patch certainly broke the
> exynos DSI  Let me know what I need to do for next version to send-up?
>
> [1] https://cgit.freedesktop.org/drm/drm-misc/commit/?id=92e794fab87af0793403d5e4a547f0be94a0e656
> [2] https://patchwork.kernel.org/project/dri-devel/cover/20211215101534.45003-1-jagan@amarulasolutions.com/
>
> Thanks,
> Jagan.

Re: [PATCH 1/2] drm: exynos: dsi: Convert to bridge driver

[Jagan Teki]

Hi Robert,

On Mon, Jan 10, 2022 at 9:02 PM Robert Foss <robert.foss@linaro.org> wrote:
>
> Hey Jagan,
>
> This is a mistake on my end, I must have been looking at reviewing
> this series and then accidentally included it with another batch of
> patches. Thank you for catching this.

Thanks for the response.

>
> I would suggest reverting these two patches[1][2]. Is that ok with you?

May be I will revert 1/2. but 2/2 is valid. Please let me know, if you
have any concerns on reverting 1/2.

Thanks,
Jagan.

Re: [PATCH 1/2] drm: exynos: dsi: Convert to bridge driver

[Robert Foss]

On Mon, 10 Jan 2022 at 16:35, Jagan Teki <jagan@amarulasolutions.com> wrote:
>
> Hi Robert,
>
> On Mon, Jan 10, 2022 at 9:02 PM Robert Foss <robert.foss@linaro.org> wrote:
> >
> > Hey Jagan,
> >
> > This is a mistake on my end, I must have been looking at reviewing
> > this series and then accidentally included it with another batch of
> > patches. Thank you for catching this.
>
> Thanks for the response.
>
> >
> > I would suggest reverting these two patches[1][2]. Is that ok with you?
>
> May be I will revert 1/2. but 2/2 is valid. Please let me know, if you
> have any concerns on reverting 1/2.

Please go ahead!

Re: [PATCH 1/2] drm: exynos: dsi: Convert to bridge driver

[Jagan Teki]

On Mon, Jan 10, 2022 at 9:10 PM Robert Foss <robert.foss@linaro.org> wrote:
>
> On Mon, 10 Jan 2022 at 16:35, Jagan Teki <jagan@amarulasolutions.com> wrote:
> >
> > Hi Robert,
> >
> > On Mon, Jan 10, 2022 at 9:02 PM Robert Foss <robert.foss@linaro.org> wrote:
> > >
> > > Hey Jagan,
> > >
> > > This is a mistake on my end, I must have been looking at reviewing
> > > this series and then accidentally included it with another batch of
> > > patches. Thank you for catching this.
> >
> > Thanks for the response.
> >
> > >
> > > I would suggest reverting these two patches[1][2]. Is that ok with you?
> >
> > May be I will revert 1/2. but 2/2 is valid. Please let me know, if you
> > have any concerns on reverting 1/2.
>
> Please go ahead!

Sent.

Thanks,
Jagan.

Re: [PATCH 1/2] drm: exynos: dsi: Convert to bridge driver

[Fabio Estevam]

Hi Jagan,

On Mon, Nov 22, 2021 at 11:21 AM Jagan Teki <jagan@amarulasolutions.com> wrote:

> Is this with Bridge or normal DSI panel?

According to the log shared by Marek, the dts being used is:
 arch/arm64/boot/dts/exynos/exynos5433-tm2e.dts
which includes arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi.

In this dtsi there is a "sil,sii8620" bridge.

Re: [PATCH 1/2] drm: exynos: dsi: Convert to bridge driver

[Marek Szyprowski]

On 22.11.2021 15:40, Fabio Estevam wrote:
> Hi Jagan,
>
> On Mon, Nov 22, 2021 at 11:21 AM Jagan Teki <jagan@amarulasolutions.com> wrote:
>
>> Is this with Bridge or normal DSI panel?
> According to the log shared by Marek, the dts being used is:
>   arch/arm64/boot/dts/exynos/exynos5433-tm2e.dts
> which includes arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi.
>
> In this dtsi there is a "sil,sii8620" bridge.

Sii8620 bridge is attached to the HDMI display path. That's completely 
different from the DSI display path modified by this patchset.

Best regards

-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland

Re: [PATCH 1/2] drm: exynos: dsi: Convert to bridge driver

[Marek Szyprowski]

Hi Jagan,

On 22.11.2021 15:21, Jagan Teki wrote:
> On Mon, Nov 22, 2021 at 7:45 PM Marek Szyprowski
> <m.szyprowski@samsung.com> wrote:
>> On 22.11.2021 08:06, Jagan Teki wrote:
>>> Some display panels would come up with a non-DSI output, those
>>> can have an option to connect the DSI host by means of interface
>>> bridge converter.
>>>
>>> This DSI to non-DSI interface bridge converter would requires
>>> DSI Host to handle drm bridge functionalities in order to DSI
>>> Host to Interface bridge.
>>>
>>> This patch convert the existing to a drm bridge driver with a
>>> built-in encoder support for compatibility with existing
>>> component drivers.
>>>
>>> Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
>>> ---
>>> Note:
>>> Hi Marek Szyprowski,
>>>
>>> Please test this on Panel and Bridge hardware.
>> I don't have good news, t crashes:
>>
>> [drm] Exynos DRM: using 13800000.decon device for DMA mapping operations
>> exynos-drm exynos-drm: bound 13800000.decon (ops decon_component_ops)
>> exynos-drm exynos-drm: bound 13880000.decon (ops decon_component_ops)
>> exynos-drm exynos-drm: bound 13930000.mic (ops exynos_mic_component_ops)
>> [drm:drm_bridge_attach] *ERROR* failed to attach bridge
>> /soc@0/dsi@13900000 to encoder TMDS-67: -22
>> exynos-drm exynos-drm: failed to bind 13900000.dsi (ops
>> exynos_dsi_component_ops): -22
>> Internal error: synchronous external abort: 96000210 [#1] PREEMPT SMP
>> Modules linked in:
>> CPU: 2 PID: 74 Comm: kworker/u16:1 Not tainted 5.16.0-rc1+ #4141
>> Hardware name: Samsung TM2E board (DT)
>> Workqueue: events_unbound deferred_probe_work_func
>> pstate: 80000005 (Nzcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
>> pc : decon_atomic_disable+0x58/0xd4
>> lr : decon_atomic_disable+0x28/0xd4
>> sp : ffff80001390b940
>> x29: ffff80001390b940 x28: ffff80001259a000 x27: ffff000027f39e80
>> input: stmfts as
>> /devices/platform/soc@0/14ed0000.hsi2c/i2c-3/3-0049/input/input0
>> x26: 00000000ffffffea x25: ffff000025a40280 x24: 0000000000000001
>> x23: ffff800011b55f98 x22: ffff0000315dc000 x21: ffff00002695d100
>> x20: ffff000027e7a080 x19: ffff0000315e6000 x18: 0000000000000000
>> x17: 645f736f6e797865 x16: 2073706f28206973 x15: 0000000000028ee0
>> x14: 0000000000000028 x13: 0000000000000001 x12: 0000000000000040
>> x11: ffff000023c18920 x10: ffff000023c18922 x9 : ffff8000126352f0
>> x8 : ffff000023c00270 x7 : 0000000000000000 x6 : ffff000023c00268
>> x5 : ffff000027e7a3a0 x4 : 0000000000000001 x3 : ffff000027e7a080
>> x2 : 0000000000000024 x1 : ffff800013bc8024 x0 : ffff0000246117c0
>> Call trace:
>>    decon_atomic_disable+0x58/0xd4
>>    decon_unbind+0x1c/0x3c
>>    component_unbind+0x38/0x60
>>    component_bind_all+0x16c/0x25c
>>    exynos_drm_bind+0x104/0x1bc
>>    try_to_bring_up_master+0x164/0x1d0
>>    __component_add+0xa8/0x174
>>    component_add+0x14/0x20
>>    hdmi_probe+0x438/0x710
>>    platform_probe+0x68/0xe0
>>    really_probe.part.0+0x9c/0x31c
>>    __driver_probe_device+0x98/0x144
>>    driver_probe_device+0xc8/0x160
>>    __device_attach_driver+0xb8/0x120
>>    bus_for_each_drv+0x78/0xd0
>>    __device_attach+0xd8/0x180
>>    device_initial_probe+0x14/0x20
>>    bus_probe_device+0x9c/0xa4
>>    deferred_probe_work_func+0x88/0xc4
>>    process_one_work+0x288/0x6f0
>>    worker_thread+0x74/0x470
>>    kthread+0x188/0x194
>>    ret_from_fork+0x10/0x20
>> Code: 11002042 f9481c61 531e7442 8b020021 (88dffc21)
>> ---[ end trace d73aff585b108954 ]---
>> Kernel panic - not syncing: synchronous external abort: Fatal exception
>> SMP: stopping secondary CPUs
>> Kernel Offset: disabled
>> CPU features: 0x2,300071c2,00000846
>> Memory Limit: none
>> ---[ end Kernel panic - not syncing: synchronous external abort: Fatal
>> exception ]---
> Is this with Bridge or normal DSI panel?

This log is from the TM2e board 
(arch/arm64/boot/dts/exynos/exynos5433-tm2e.dts) with a normal DSI panel 
and Exynos MIC bridge between Exynos Decon and Exynos DSI.

Best regards

-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland

[PATCH 2/2] drm: exynos: dsi: Add mode_set function

[Jagan Teki]

Get the display mode settings via mode_set bridge function
instead of explicitly de-reference.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
---
 drivers/gpu/drm/exynos/exynos_drm_dsi.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
index 174590f543c3..3d4713346949 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
@@ -260,6 +260,7 @@ struct exynos_dsi {
 	struct drm_bridge bridge;
 	struct drm_bridge *out_bridge;
 	struct device *dev;
+	struct drm_display_mode mode;
 
 	void __iomem *reg_base;
 	struct phy *phy;
@@ -883,7 +884,7 @@ static int exynos_dsi_init_link(struct exynos_dsi *dsi)
 
 static void exynos_dsi_set_display_mode(struct exynos_dsi *dsi)
 {
-	struct drm_display_mode *m = &dsi->encoder.crtc->state->adjusted_mode;
+	struct drm_display_mode *m = &dsi->mode;
 	unsigned int num_bits_resol = dsi->driver_data->num_bits_resol;
 	u32 reg;
 
@@ -1526,6 +1527,15 @@ static int exynos_dsi_create_connector(struct exynos_dsi *dsi)
 	return 0;
 }
 
+static void exynos_dsi_mode_set(struct drm_bridge *bridge,
+				const struct drm_display_mode *mode,
+				const struct drm_display_mode *adjusted_mode)
+{
+	struct exynos_dsi *dsi = bridge_to_dsi(bridge);
+
+	drm_mode_copy(&dsi->mode, adjusted_mode);
+}
+
 static int exynos_dsi_attach(struct drm_bridge *bridge,
 			     enum drm_bridge_attach_flags flags)
 {
@@ -1540,6 +1550,7 @@ static const struct drm_bridge_funcs exynos_dsi_bridge_funcs = {
 	.atomic_reset		= drm_atomic_helper_bridge_reset,
 	.atomic_enable		= exynos_dsi_atomic_enable,
 	.atomic_disable		= exynos_dsi_atomic_disable,
+	.mode_set		= exynos_dsi_mode_set,
 	.attach			= exynos_dsi_attach,
 };
 
-- 
2.25.1

Re: [PATCH 2/2] drm: exynos: dsi: Add mode_set function

[Robert Foss]

Hi Jagan,

On Mon, 22 Nov 2021 at 08:06, Jagan Teki <jagan@amarulasolutions.com> wrote:
>
> Get the display mode settings via mode_set bridge function
> instead of explicitly de-reference.
>
> Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
> ---
>  drivers/gpu/drm/exynos/exynos_drm_dsi.c | 13 ++++++++++++-
>  1 file changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> index 174590f543c3..3d4713346949 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> @@ -260,6 +260,7 @@ struct exynos_dsi {
>         struct drm_bridge bridge;
>         struct drm_bridge *out_bridge;
>         struct device *dev;
> +       struct drm_display_mode mode;
>
>         void __iomem *reg_base;
>         struct phy *phy;
> @@ -883,7 +884,7 @@ static int exynos_dsi_init_link(struct exynos_dsi *dsi)
>
>  static void exynos_dsi_set_display_mode(struct exynos_dsi *dsi)
>  {
> -       struct drm_display_mode *m = &dsi->encoder.crtc->state->adjusted_mode;
> +       struct drm_display_mode *m = &dsi->mode;
>         unsigned int num_bits_resol = dsi->driver_data->num_bits_resol;
>         u32 reg;
>
> @@ -1526,6 +1527,15 @@ static int exynos_dsi_create_connector(struct exynos_dsi *dsi)
>         return 0;
>  }
>
> +static void exynos_dsi_mode_set(struct drm_bridge *bridge,
> +                               const struct drm_display_mode *mode,
> +                               const struct drm_display_mode *adjusted_mode)
> +{
> +       struct exynos_dsi *dsi = bridge_to_dsi(bridge);
> +
> +       drm_mode_copy(&dsi->mode, adjusted_mode);
> +}
> +
>  static int exynos_dsi_attach(struct drm_bridge *bridge,
>                              enum drm_bridge_attach_flags flags)
>  {
> @@ -1540,6 +1550,7 @@ static const struct drm_bridge_funcs exynos_dsi_bridge_funcs = {
>         .atomic_reset           = drm_atomic_helper_bridge_reset,
>         .atomic_enable          = exynos_dsi_atomic_enable,
>         .atomic_disable         = exynos_dsi_atomic_disable,
> +       .mode_set               = exynos_dsi_mode_set,
>         .attach                 = exynos_dsi_attach,
>  };
>
> --
> 2.25.1
>

Reviewed-by: Robert Foss <robert.foss@linaro.org>