Linux-Samsung-soc Archive on lore.kernel.org
 help / color / Atom feed
* [PATCH] drm/bridge: Fix Exynos DSI after making bridge chain a double-linked list
       [not found] <CGME20191227110216eucas1p17cbf91afa905852d3c0b1efeec0f6f8d@eucas1p1.samsung.com>
@ 2019-12-27 11:01 ` Marek Szyprowski
  2019-12-27 12:00   ` Boris Brezillon
  0 siblings, 1 reply; 4+ messages in thread
From: Marek Szyprowski @ 2019-12-27 11:01 UTC (permalink / raw)
  To: dri-devel, linux-samsung-soc, linux-kernel
  Cc: Marek Szyprowski, Inki Dae, Seung-Woo Kim, Andrzej Hajda,
	Boris Brezillon, Krzysztof Kozlowski, Bartlomiej Zolnierkiewicz,
	Laurent Pinchart, Neil Armstrong, Sam Ravnborg, Thierry Reding

Exynos DSI DRM driver uses private calls to out bridge to force certain
order of operations during init/exit sequences. This no longer works after
conversion of bridge chain to a double-linked list. To fix the regression
call bridge related operations manually instead of the generic
drm_bridge_chain_*() operations.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Fixes: 05193dc38197 ("drm/bridge: Make the bridge chain a double-linked list")
---
This patch is a result of the following discussion:
https://www.spinics.net/lists/dri-devel/msg239256.html
---
 drivers/gpu/drm/exynos/exynos_drm_dsi.c | 21 ++++++++++++---------
 1 file changed, 12 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
index 3955f84dc893..f5905c239a86 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
@@ -255,7 +255,6 @@ struct exynos_dsi {
 	struct mipi_dsi_host dsi_host;
 	struct drm_connector connector;
 	struct drm_panel *panel;
-	struct list_head bridge_chain;
 	struct drm_bridge *out_bridge;
 	struct device *dev;
 
@@ -1391,7 +1390,8 @@ static void exynos_dsi_enable(struct drm_encoder *encoder)
 		if (ret < 0)
 			goto err_put_sync;
 	} else {
-		drm_bridge_chain_pre_enable(dsi->out_bridge);
+		if (dsi->out_bridge->funcs->pre_enable)
+			dsi->out_bridge->funcs->pre_enable(dsi->out_bridge);
 	}
 
 	exynos_dsi_set_display_mode(dsi);
@@ -1402,7 +1402,8 @@ static void exynos_dsi_enable(struct drm_encoder *encoder)
 		if (ret < 0)
 			goto err_display_disable;
 	} else {
-		drm_bridge_chain_enable(dsi->out_bridge);
+		if (dsi->out_bridge->funcs->enable)
+			dsi->out_bridge->funcs->enable(dsi->out_bridge);
 	}
 
 	dsi->state |= DSIM_STATE_VIDOUT_AVAILABLE;
@@ -1427,10 +1428,12 @@ static void exynos_dsi_disable(struct drm_encoder *encoder)
 	dsi->state &= ~DSIM_STATE_VIDOUT_AVAILABLE;
 
 	drm_panel_disable(dsi->panel);
-	drm_bridge_chain_disable(dsi->out_bridge);
+	if (dsi->out_bridge->funcs->disable)
+		dsi->out_bridge->funcs->disable(dsi->out_bridge);
 	exynos_dsi_set_display_enable(dsi, false);
 	drm_panel_unprepare(dsi->panel);
-	drm_bridge_chain_post_disable(dsi->out_bridge);
+	if (dsi->out_bridge->funcs->post_disable)
+		dsi->out_bridge->funcs->post_disable(dsi->out_bridge);
 	dsi->state &= ~DSIM_STATE_ENABLED;
 	pm_runtime_put_sync(dsi->dev);
 }
@@ -1521,9 +1524,11 @@ static int exynos_dsi_host_attach(struct mipi_dsi_host *host,
 
 	out_bridge  = of_drm_find_bridge(device->dev.of_node);
 	if (out_bridge) {
-		drm_bridge_attach(encoder, out_bridge, NULL);
+		out_bridge->dev = drm;
+		out_bridge->encoder = encoder;
+		if (out_bridge->funcs->attach)
+			out_bridge->funcs->attach(out_bridge);
 		dsi->out_bridge = out_bridge;
-		list_splice(&encoder->bridge_chain, &dsi->bridge_chain);
 	} else {
 		int ret = exynos_dsi_create_connector(encoder);
 
@@ -1589,7 +1594,6 @@ static int exynos_dsi_host_detach(struct mipi_dsi_host *host,
 		if (dsi->out_bridge->funcs->detach)
 			dsi->out_bridge->funcs->detach(dsi->out_bridge);
 		dsi->out_bridge = NULL;
-		INIT_LIST_HEAD(&dsi->bridge_chain);
 	}
 
 	if (drm->mode_config.poll_enabled)
@@ -1737,7 +1741,6 @@ static int exynos_dsi_probe(struct platform_device *pdev)
 	init_completion(&dsi->completed);
 	spin_lock_init(&dsi->transfer_lock);
 	INIT_LIST_HEAD(&dsi->transfer_list);
-	INIT_LIST_HEAD(&dsi->bridge_chain);
 
 	dsi->dsi_host.ops = &exynos_dsi_ops;
 	dsi->dsi_host.dev = dev;
-- 
2.17.1


^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: [PATCH] drm/bridge: Fix Exynos DSI after making bridge chain a double-linked list
  2019-12-27 11:01 ` [PATCH] drm/bridge: Fix Exynos DSI after making bridge chain a double-linked list Marek Szyprowski
@ 2019-12-27 12:00   ` Boris Brezillon
  2019-12-27 13:23     ` Boris Brezillon
  0 siblings, 1 reply; 4+ messages in thread
From: Boris Brezillon @ 2019-12-27 12:00 UTC (permalink / raw)
  To: Marek Szyprowski
  Cc: dri-devel, linux-samsung-soc, linux-kernel, Inki Dae,
	Seung-Woo Kim, Andrzej Hajda, Krzysztof Kozlowski,
	Bartlomiej Zolnierkiewicz, Laurent Pinchart, Neil Armstrong,
	Sam Ravnborg, Thierry Reding

On Fri, 27 Dec 2019 12:01:35 +0100
Marek Szyprowski <m.szyprowski@samsung.com> wrote:

> Exynos DSI DRM driver uses private calls to out bridge to force certain
> order of operations during init/exit sequences. This no longer works after
> conversion of bridge chain to a double-linked list. To fix the regression
> call bridge related operations manually instead of the generic
> drm_bridge_chain_*() operations.

I think it'd be worth explaining what the problem is (infinite loop
caused by list_for_each_entry() use when the bridge is no longer part
of the chain attached to the encoder).

> 
> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
> Fixes: 05193dc38197 ("drm/bridge: Make the bridge chain a double-linked list")

We also need to fix that in VC4.

> ---
> This patch is a result of the following discussion:
> https://www.spinics.net/lists/dri-devel/msg239256.html
> ---
>  drivers/gpu/drm/exynos/exynos_drm_dsi.c | 21 ++++++++++++---------
>  1 file changed, 12 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> index 3955f84dc893..f5905c239a86 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> @@ -255,7 +255,6 @@ struct exynos_dsi {
>  	struct mipi_dsi_host dsi_host;
>  	struct drm_connector connector;
>  	struct drm_panel *panel;
> -	struct list_head bridge_chain;
>  	struct drm_bridge *out_bridge;
>  	struct device *dev;
>  
> @@ -1391,7 +1390,8 @@ static void exynos_dsi_enable(struct drm_encoder *encoder)
>  		if (ret < 0)
>  			goto err_put_sync;
>  	} else {
> -		drm_bridge_chain_pre_enable(dsi->out_bridge);
> +		if (dsi->out_bridge->funcs->pre_enable)
> +			dsi->out_bridge->funcs->pre_enable(dsi->out_bridge);

Okay, so you're calling ->{pre_enable,enable,disable,post_disable}() on
the first bridge element which only works if the chain contains one
bridge (see below). Maybe you should keep exynos_dsi.bridge_chain and
create custom helpers to iterate over chain elements instead of calling
those hooks only on out_bridge.

>  	}
>  
>  	exynos_dsi_set_display_mode(dsi);
> @@ -1402,7 +1402,8 @@ static void exynos_dsi_enable(struct drm_encoder *encoder)
>  		if (ret < 0)
>  			goto err_display_disable;
>  	} else {
> -		drm_bridge_chain_enable(dsi->out_bridge);
> +		if (dsi->out_bridge->funcs->enable)
> +			dsi->out_bridge->funcs->enable(dsi->out_bridge);
>  	}
>  
>  	dsi->state |= DSIM_STATE_VIDOUT_AVAILABLE;
> @@ -1427,10 +1428,12 @@ static void exynos_dsi_disable(struct drm_encoder *encoder)
>  	dsi->state &= ~DSIM_STATE_VIDOUT_AVAILABLE;
>  
>  	drm_panel_disable(dsi->panel);
> -	drm_bridge_chain_disable(dsi->out_bridge);
> +	if (dsi->out_bridge->funcs->disable)
> +		dsi->out_bridge->funcs->disable(dsi->out_bridge);
>  	exynos_dsi_set_display_enable(dsi, false);
>  	drm_panel_unprepare(dsi->panel);
> -	drm_bridge_chain_post_disable(dsi->out_bridge);
> +	if (dsi->out_bridge->funcs->post_disable)
> +		dsi->out_bridge->funcs->post_disable(dsi->out_bridge);
>  	dsi->state &= ~DSIM_STATE_ENABLED;
>  	pm_runtime_put_sync(dsi->dev);
>  }
> @@ -1521,9 +1524,11 @@ static int exynos_dsi_host_attach(struct mipi_dsi_host *host,
>  
>  	out_bridge  = of_drm_find_bridge(device->dev.of_node);
>  	if (out_bridge) {
> -		drm_bridge_attach(encoder, out_bridge, NULL);
> +		out_bridge->dev = drm;
> +		out_bridge->encoder = encoder;
> +		if (out_bridge->funcs->attach)
> +			out_bridge->funcs->attach(out_bridge);

If you don't want to keep the dsi_exynos.bridge_chain field, you should
probably still use drm_bridge_attach() here and manually reset
encoder->bridge_chain after checking it only contains a single element.
Something like:

		drm_bridge_attach(encoder, out_bridge, NULL);

		/*
		 * FIXME: we need to control the enable/disable
		 * sequence to make sure the DSI host controller is
		 * ready to send DSI commands before the
		 * bridge->pre_enable()/panel->prepare() hooks are
		 * called (those hooks are allowed to send DSI
		 * commands). The only way to do that right now is to
		 * reset the bridge chain so that the core thinks it's
		 * empty and turns drm_bridge_chain_xxx() calls into
		 * NOPs. This only works if the chain contains only one
		 * bridge, otherwise we'd be skipping bridge->xxx()
		 * calls on other bridges which is wrong.
		 */
		WARN_ON(!list_is_singular(&encoder->bridge_chain));
		INIT_LIST_HEAD(&encoder->bridge_chain);

Calling ->attach() directly might lead to an invalid pointer
dereference if out_bridge tries to attach to another bridge
(out_bridge->bridge_node is uninitialized if you don't call
drm_bridge_attach()).

>  		dsi->out_bridge = out_bridge;
> -		list_splice(&encoder->bridge_chain, &dsi->bridge_chain);
>  	} else {
>  		int ret = exynos_dsi_create_connector(encoder);
>  
> @@ -1589,7 +1594,6 @@ static int exynos_dsi_host_detach(struct mipi_dsi_host *host,
>  		if (dsi->out_bridge->funcs->detach)
>  			dsi->out_bridge->funcs->detach(dsi->out_bridge);
>  		dsi->out_bridge = NULL;
> -		INIT_LIST_HEAD(&dsi->bridge_chain);
>  	}
>  
>  	if (drm->mode_config.poll_enabled)
> @@ -1737,7 +1741,6 @@ static int exynos_dsi_probe(struct platform_device *pdev)
>  	init_completion(&dsi->completed);
>  	spin_lock_init(&dsi->transfer_lock);
>  	INIT_LIST_HEAD(&dsi->transfer_list);
> -	INIT_LIST_HEAD(&dsi->bridge_chain);
>  
>  	dsi->dsi_host.ops = &exynos_dsi_ops;
>  	dsi->dsi_host.dev = dev;


^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: [PATCH] drm/bridge: Fix Exynos DSI after making bridge chain a double-linked list
  2019-12-27 12:00   ` Boris Brezillon
@ 2019-12-27 13:23     ` Boris Brezillon
  2019-12-27 14:03       ` Boris Brezillon
  0 siblings, 1 reply; 4+ messages in thread
From: Boris Brezillon @ 2019-12-27 13:23 UTC (permalink / raw)
  To: Marek Szyprowski
  Cc: dri-devel, linux-samsung-soc, linux-kernel, Inki Dae,
	Seung-Woo Kim, Andrzej Hajda, Krzysztof Kozlowski,
	Bartlomiej Zolnierkiewicz, Laurent Pinchart, Neil Armstrong,
	Sam Ravnborg, Thierry Reding

On Fri, 27 Dec 2019 13:00:04 +0100
Boris Brezillon <boris.brezillon@collabora.com> wrote:

> On Fri, 27 Dec 2019 12:01:35 +0100
> Marek Szyprowski <m.szyprowski@samsung.com> wrote:
> 
> > Exynos DSI DRM driver uses private calls to out bridge to force certain
> > order of operations during init/exit sequences. This no longer works after
> > conversion of bridge chain to a double-linked list. To fix the regression
> > call bridge related operations manually instead of the generic
> > drm_bridge_chain_*() operations.  
> 
> I think it'd be worth explaining what the problem is (infinite loop
> caused by list_for_each_entry() use when the bridge is no longer part
> of the chain attached to the encoder).
> 
> > 
> > Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
> > Fixes: 05193dc38197 ("drm/bridge: Make the bridge chain a double-linked list")  
> 
> We also need to fix that in VC4.
> 
> > ---
> > This patch is a result of the following discussion:
> > https://www.spinics.net/lists/dri-devel/msg239256.html
> > ---
> >  drivers/gpu/drm/exynos/exynos_drm_dsi.c | 21 ++++++++++++---------
> >  1 file changed, 12 insertions(+), 9 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> > index 3955f84dc893..f5905c239a86 100644
> > --- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> > +++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> > @@ -255,7 +255,6 @@ struct exynos_dsi {
> >  	struct mipi_dsi_host dsi_host;
> >  	struct drm_connector connector;
> >  	struct drm_panel *panel;
> > -	struct list_head bridge_chain;
> >  	struct drm_bridge *out_bridge;
> >  	struct device *dev;
> >  
> > @@ -1391,7 +1390,8 @@ static void exynos_dsi_enable(struct drm_encoder *encoder)
> >  		if (ret < 0)
> >  			goto err_put_sync;
> >  	} else {
> > -		drm_bridge_chain_pre_enable(dsi->out_bridge);
> > +		if (dsi->out_bridge->funcs->pre_enable)
> > +			dsi->out_bridge->funcs->pre_enable(dsi->out_bridge);  
> 
> Okay, so you're calling ->{pre_enable,enable,disable,post_disable}() on
> the first bridge element which only works if the chain contains one
> bridge (see below). Maybe you should keep exynos_dsi.bridge_chain and
> create custom helpers to iterate over chain elements instead of calling
> those hooks only on out_bridge.

The following diff should fix the problem while keeping the solution
generic enough to support chains containing more than one bridge.

--->8---
diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
index 3955f84dc893..c861b640fc59 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
@@ -1378,6 +1378,7 @@ static void exynos_dsi_unregister_te_irq(struct exynos_dsi *dsi)
 static void exynos_dsi_enable(struct drm_encoder *encoder)
 {
        struct exynos_dsi *dsi = encoder_to_dsi(encoder);
+       struct drm_bridge *iter;
        int ret;
 
        if (dsi->state & DSIM_STATE_ENABLED)
@@ -1391,7 +1392,11 @@ static void exynos_dsi_enable(struct drm_encoder *encoder)
                if (ret < 0)
                        goto err_put_sync;
        } else {
-               drm_bridge_chain_pre_enable(dsi->out_bridge);
+               list_for_each_entry_reverse(iter, &encoder->bridge_chain,
+                                           chain_node) {
+                       if (iter->funcs->pre_enable)
+                               iter->funcs->pre_enable(iter);
+               }
        }
 
        exynos_dsi_set_display_mode(dsi);
@@ -1402,7 +1407,10 @@ static void exynos_dsi_enable(struct drm_encoder *encoder)
                if (ret < 0)
                        goto err_display_disable;
        } else {
-               drm_bridge_chain_enable(dsi->out_bridge);
+               list_for_each_entry(iter, &encoder->bridge_chain, chain_node) {
+                       if (iter->funcs->enable)
+                               iter->funcs->enable(iter);
+               }
        }
 
        dsi->state |= DSIM_STATE_VIDOUT_AVAILABLE;
@@ -1420,6 +1428,7 @@ static void exynos_dsi_enable(struct drm_encoder *encoder)
 static void exynos_dsi_disable(struct drm_encoder *encoder)
 {
        struct exynos_dsi *dsi = encoder_to_dsi(encoder);
+       struct drm_bridge *iter;
 
        if (!(dsi->state & DSIM_STATE_ENABLED))
                return;
@@ -1427,10 +1436,20 @@ static void exynos_dsi_disable(struct drm_encoder *encoder)
        dsi->state &= ~DSIM_STATE_VIDOUT_AVAILABLE;
 
        drm_panel_disable(dsi->panel);
-       drm_bridge_chain_disable(dsi->out_bridge);
+
+       list_for_each_entry_reverse(iter, &encoder->bridge_chain, chain_node) {
+               if (iter->funcs->disable)
+                       iter->funcs->disable(iter);
+       }
+
        exynos_dsi_set_display_enable(dsi, false);
        drm_panel_unprepare(dsi->panel);
-       drm_bridge_chain_post_disable(dsi->out_bridge);
+
+       list_for_each_entry(iter, &encoder->bridge_chain, chain_node) {
+               if (iter->funcs->post_disable)
+                       iter->funcs->post_disable(iter);
+       }
+
        dsi->state &= ~DSIM_STATE_ENABLED;
        pm_runtime_put_sync(dsi->dev);
 }
@@ -1523,7 +1542,7 @@ static int exynos_dsi_host_attach(struct mipi_dsi_host *host,
        if (out_bridge) {
                drm_bridge_attach(encoder, out_bridge, NULL);
                dsi->out_bridge = out_bridge;
-               list_splice(&encoder->bridge_chain, &dsi->bridge_chain);
+               list_splice_init(&encoder->bridge_chain, &dsi->bridge_chain);
        } else {
                int ret = exynos_dsi_create_connector(encoder);
 

^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: [PATCH] drm/bridge: Fix Exynos DSI after making bridge chain a double-linked list
  2019-12-27 13:23     ` Boris Brezillon
@ 2019-12-27 14:03       ` Boris Brezillon
  0 siblings, 0 replies; 4+ messages in thread
From: Boris Brezillon @ 2019-12-27 14:03 UTC (permalink / raw)
  To: Marek Szyprowski
  Cc: dri-devel, linux-samsung-soc, linux-kernel, Inki Dae,
	Seung-Woo Kim, Andrzej Hajda, Krzysztof Kozlowski,
	Bartlomiej Zolnierkiewicz, Laurent Pinchart, Neil Armstrong,
	Sam Ravnborg, Thierry Reding

On Fri, 27 Dec 2019 14:23:13 +0100
Boris Brezillon <boris.brezillon@collabora.com> wrote:

> On Fri, 27 Dec 2019 13:00:04 +0100
> Boris Brezillon <boris.brezillon@collabora.com> wrote:
> 
> > On Fri, 27 Dec 2019 12:01:35 +0100
> > Marek Szyprowski <m.szyprowski@samsung.com> wrote:
> >   
> > > Exynos DSI DRM driver uses private calls to out bridge to force certain
> > > order of operations during init/exit sequences. This no longer works after
> > > conversion of bridge chain to a double-linked list. To fix the regression
> > > call bridge related operations manually instead of the generic
> > > drm_bridge_chain_*() operations.    
> > 
> > I think it'd be worth explaining what the problem is (infinite loop
> > caused by list_for_each_entry() use when the bridge is no longer part
> > of the chain attached to the encoder).
> >   
> > > 
> > > Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
> > > Fixes: 05193dc38197 ("drm/bridge: Make the bridge chain a double-linked list")    
> > 
> > We also need to fix that in VC4.
> >   
> > > ---
> > > This patch is a result of the following discussion:
> > > https://www.spinics.net/lists/dri-devel/msg239256.html
> > > ---
> > >  drivers/gpu/drm/exynos/exynos_drm_dsi.c | 21 ++++++++++++---------
> > >  1 file changed, 12 insertions(+), 9 deletions(-)
> > > 
> > > diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> > > index 3955f84dc893..f5905c239a86 100644
> > > --- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> > > +++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> > > @@ -255,7 +255,6 @@ struct exynos_dsi {
> > >  	struct mipi_dsi_host dsi_host;
> > >  	struct drm_connector connector;
> > >  	struct drm_panel *panel;
> > > -	struct list_head bridge_chain;
> > >  	struct drm_bridge *out_bridge;
> > >  	struct device *dev;
> > >  
> > > @@ -1391,7 +1390,8 @@ static void exynos_dsi_enable(struct drm_encoder *encoder)
> > >  		if (ret < 0)
> > >  			goto err_put_sync;
> > >  	} else {
> > > -		drm_bridge_chain_pre_enable(dsi->out_bridge);
> > > +		if (dsi->out_bridge->funcs->pre_enable)
> > > +			dsi->out_bridge->funcs->pre_enable(dsi->out_bridge);    
> > 
> > Okay, so you're calling ->{pre_enable,enable,disable,post_disable}() on
> > the first bridge element which only works if the chain contains one
> > bridge (see below). Maybe you should keep exynos_dsi.bridge_chain and
> > create custom helpers to iterate over chain elements instead of calling
> > those hooks only on out_bridge.  
> 
> The following diff should fix the problem while keeping the solution
> generic enough to support chains containing more than one bridge.
> 
> --->8---  
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> index 3955f84dc893..c861b640fc59 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> @@ -1378,6 +1378,7 @@ static void exynos_dsi_unregister_te_irq(struct exynos_dsi *dsi)
>  static void exynos_dsi_enable(struct drm_encoder *encoder)
>  {
>         struct exynos_dsi *dsi = encoder_to_dsi(encoder);
> +       struct drm_bridge *iter;
>         int ret;
>  
>         if (dsi->state & DSIM_STATE_ENABLED)
> @@ -1391,7 +1392,11 @@ static void exynos_dsi_enable(struct drm_encoder *encoder)
>                 if (ret < 0)
>                         goto err_put_sync;
>         } else {
> -               drm_bridge_chain_pre_enable(dsi->out_bridge);
> +               list_for_each_entry_reverse(iter, &encoder->bridge_chain,

						     ^&dsi->bridge_chain

And the same applies to all list_for_each() calls in this patch.

> +                                           chain_node) {
> +                       if (iter->funcs->pre_enable)
> +                               iter->funcs->pre_enable(iter);
> +               }
>         }
>  
>         exynos_dsi_set_display_mode(dsi);
> @@ -1402,7 +1407,10 @@ static void exynos_dsi_enable(struct drm_encoder *encoder)
>                 if (ret < 0)
>                         goto err_display_disable;
>         } else {
> -               drm_bridge_chain_enable(dsi->out_bridge);
> +               list_for_each_entry(iter, &encoder->bridge_chain, chain_node) {
> +                       if (iter->funcs->enable)
> +                               iter->funcs->enable(iter);
> +               }
>         }
>  
>         dsi->state |= DSIM_STATE_VIDOUT_AVAILABLE;
> @@ -1420,6 +1428,7 @@ static void exynos_dsi_enable(struct drm_encoder *encoder)
>  static void exynos_dsi_disable(struct drm_encoder *encoder)
>  {
>         struct exynos_dsi *dsi = encoder_to_dsi(encoder);
> +       struct drm_bridge *iter;
>  
>         if (!(dsi->state & DSIM_STATE_ENABLED))
>                 return;
> @@ -1427,10 +1436,20 @@ static void exynos_dsi_disable(struct drm_encoder *encoder)
>         dsi->state &= ~DSIM_STATE_VIDOUT_AVAILABLE;
>  
>         drm_panel_disable(dsi->panel);
> -       drm_bridge_chain_disable(dsi->out_bridge);
> +
> +       list_for_each_entry_reverse(iter, &encoder->bridge_chain, chain_node) {
> +               if (iter->funcs->disable)
> +                       iter->funcs->disable(iter);
> +       }
> +
>         exynos_dsi_set_display_enable(dsi, false);
>         drm_panel_unprepare(dsi->panel);
> -       drm_bridge_chain_post_disable(dsi->out_bridge);
> +
> +       list_for_each_entry(iter, &encoder->bridge_chain, chain_node) {
> +               if (iter->funcs->post_disable)
> +                       iter->funcs->post_disable(iter);
> +       }
> +
>         dsi->state &= ~DSIM_STATE_ENABLED;
>         pm_runtime_put_sync(dsi->dev);
>  }
> @@ -1523,7 +1542,7 @@ static int exynos_dsi_host_attach(struct mipi_dsi_host *host,
>         if (out_bridge) {
>                 drm_bridge_attach(encoder, out_bridge, NULL);
>                 dsi->out_bridge = out_bridge;
> -               list_splice(&encoder->bridge_chain, &dsi->bridge_chain);
> +               list_splice_init(&encoder->bridge_chain, &dsi->bridge_chain);
>         } else {
>                 int ret = exynos_dsi_create_connector(encoder);
>  


^ permalink raw reply	[flat|nested] 4+ messages in thread

end of thread, back to index

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
     [not found] <CGME20191227110216eucas1p17cbf91afa905852d3c0b1efeec0f6f8d@eucas1p1.samsung.com>
2019-12-27 11:01 ` [PATCH] drm/bridge: Fix Exynos DSI after making bridge chain a double-linked list Marek Szyprowski
2019-12-27 12:00   ` Boris Brezillon
2019-12-27 13:23     ` Boris Brezillon
2019-12-27 14:03       ` Boris Brezillon

Linux-Samsung-soc Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-samsung-soc/0 linux-samsung-soc/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-samsung-soc linux-samsung-soc/ https://lore.kernel.org/linux-samsung-soc \
		linux-samsung-soc@vger.kernel.org
	public-inbox-index linux-samsung-soc

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-samsung-soc


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git