[PATCH 09/25] drm/atmel: Use drm_atomic_helper_commit

[PATCH 09/25] drm/atmel: Use drm_atomic_helper_commit

[Daniel Vetter]

One of these drivers that predates the nonblocking support in helpers,
and hand-rolled its own thing. Entirely not anything specific here, we
can just delete it all and replace it with the helper version.

Could also perhaps use the drm_mode_config_helper_suspend/resume
stuff, for another few lines deleted. But I'm not looking at that
stuff, I'm just going through all the atomic commit functions and make
sure they have properly annotated dma-fence critical sections
everywhere.

Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Boris Brezillon <bbrezillon@kernel.org>
Cc: Nicolas Ferre <nicolas.ferre@microchip.com>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc: Ludovic Desroches <ludovic.desroches@microchip.com>
Cc: linux-arm-kernel@lists.infradead.org
---
 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c | 96 +-------------------
 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h |  4 -
 2 files changed, 1 insertion(+), 99 deletions(-)

diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
index 871293d1aeeb..9ec156e98f06 100644
--- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
+++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
@@ -557,103 +557,10 @@ static irqreturn_t atmel_hlcdc_dc_irq_handler(int irq, void *data)
 	return IRQ_HANDLED;
 }
 
-struct atmel_hlcdc_dc_commit {
-	struct work_struct work;
-	struct drm_device *dev;
-	struct drm_atomic_state *state;
-};
-
-static void
-atmel_hlcdc_dc_atomic_complete(struct atmel_hlcdc_dc_commit *commit)
-{
-	struct drm_device *dev = commit->dev;
-	struct atmel_hlcdc_dc *dc = dev->dev_private;
-	struct drm_atomic_state *old_state = commit->state;
-
-	/* Apply the atomic update. */
-	drm_atomic_helper_commit_modeset_disables(dev, old_state);
-	drm_atomic_helper_commit_planes(dev, old_state, 0);
-	drm_atomic_helper_commit_modeset_enables(dev, old_state);
-
-	drm_atomic_helper_wait_for_vblanks(dev, old_state);
-
-	drm_atomic_helper_cleanup_planes(dev, old_state);
-
-	drm_atomic_state_put(old_state);
-
-	/* Complete the commit, wake up any waiter. */
-	spin_lock(&dc->commit.wait.lock);
-	dc->commit.pending = false;
-	wake_up_all_locked(&dc->commit.wait);
-	spin_unlock(&dc->commit.wait.lock);
-
-	kfree(commit);
-}
-
-static void atmel_hlcdc_dc_atomic_work(struct work_struct *work)
-{
-	struct atmel_hlcdc_dc_commit *commit =
-		container_of(work, struct atmel_hlcdc_dc_commit, work);
-
-	atmel_hlcdc_dc_atomic_complete(commit);
-}
-
-static int atmel_hlcdc_dc_atomic_commit(struct drm_device *dev,
-					struct drm_atomic_state *state,
-					bool async)
-{
-	struct atmel_hlcdc_dc *dc = dev->dev_private;
-	struct atmel_hlcdc_dc_commit *commit;
-	int ret;
-
-	ret = drm_atomic_helper_prepare_planes(dev, state);
-	if (ret)
-		return ret;
-
-	/* Allocate the commit object. */
-	commit = kzalloc(sizeof(*commit), GFP_KERNEL);
-	if (!commit) {
-		ret = -ENOMEM;
-		goto error;
-	}
-
-	INIT_WORK(&commit->work, atmel_hlcdc_dc_atomic_work);
-	commit->dev = dev;
-	commit->state = state;
-
-	spin_lock(&dc->commit.wait.lock);
-	ret = wait_event_interruptible_locked(dc->commit.wait,
-					      !dc->commit.pending);
-	if (ret == 0)
-		dc->commit.pending = true;
-	spin_unlock(&dc->commit.wait.lock);
-
-	if (ret)
-		goto err_free;
-
-	/* We have our own synchronization through the commit lock. */
-	BUG_ON(drm_atomic_helper_swap_state(state, false) < 0);
-
-	/* Swap state succeeded, this is the point of no return. */
-	drm_atomic_state_get(state);
-	if (async)
-		queue_work(dc->wq, &commit->work);
-	else
-		atmel_hlcdc_dc_atomic_complete(commit);
-
-	return 0;
-
-err_free:
-	kfree(commit);
-error:
-	drm_atomic_helper_cleanup_planes(dev, state);
-	return ret;
-}
-
 static const struct drm_mode_config_funcs mode_config_funcs = {
 	.fb_create = drm_gem_fb_create,
 	.atomic_check = drm_atomic_helper_check,
-	.atomic_commit = atmel_hlcdc_dc_atomic_commit,
+	.atomic_commit = drm_atomic_helper_commit,
 };
 
 static int atmel_hlcdc_dc_modeset_init(struct drm_device *dev)
@@ -716,7 +623,6 @@ static int atmel_hlcdc_dc_load(struct drm_device *dev)
 	if (!dc->wq)
 		return -ENOMEM;
 
-	init_waitqueue_head(&dc->commit.wait);
 	dc->desc = match->data;
 	dc->hlcdc = dev_get_drvdata(dev->dev->parent);
 	dev->dev_private = dc;
diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h
index 469d4507e576..9367a3747a3a 100644
--- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h
+++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h
@@ -346,10 +346,6 @@ struct atmel_hlcdc_dc {
 		u32 imr;
 		struct drm_atomic_state *state;
 	} suspend;
-	struct {
-		wait_queue_head_t wait;
-		bool pending;
-	} commit;
 };
 
 extern struct atmel_hlcdc_formats atmel_hlcdc_plane_rgb_formats;
-- 
2.27.0


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

[PATCH 10/25] drm/imx: Annotate dma-fence critical section in commit path

[Daniel Vetter]

drm_atomic_helper_commit_hw_done() is the last thing (no plane cleanup
apparrently), so it's the entire function. And a nice comment
explaining why thw wait_for_flip_done is ahead, unlike the usual
sequence.

Aside, I think since the atomic helpers do track plane disabling now
separately this might no longer be a real problem since:

commit 21a01abbe32a3cbeb903378a24e504bfd9fe0648
Author: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Date:   Mon Sep 4 12:48:37 2017 +0200

    drm/atomic: Fix freeing connector/plane state too early by tracking commits, v3.

Plus the subsequent bugfixes of course, this was tricky to get right.

Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Philipp Zabel <p.zabel@pengutronix.de>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Pengutronix Kernel Team <kernel@pengutronix.de>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: NXP Linux Team <linux-imx@nxp.com>
Cc: linux-arm-kernel@lists.infradead.org
---
 drivers/gpu/drm/imx/imx-drm-core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/imx/imx-drm-core.c b/drivers/gpu/drm/imx/imx-drm-core.c
index 36037b2e6564..8c209bd36780 100644
--- a/drivers/gpu/drm/imx/imx-drm-core.c
+++ b/drivers/gpu/drm/imx/imx-drm-core.c
@@ -80,6 +80,7 @@ static void imx_drm_atomic_commit_tail(struct drm_atomic_state *state)
 	struct drm_plane_state *old_plane_state, *new_plane_state;
 	bool plane_disabling = false;
 	int i;
+	bool fence_cookie = dma_fence_begin_signalling();
 
 	drm_atomic_helper_commit_modeset_disables(dev, state);
 
@@ -110,6 +111,7 @@ static void imx_drm_atomic_commit_tail(struct drm_atomic_state *state)
 	}
 
 	drm_atomic_helper_commit_hw_done(state);
+	dma_fence_end_signalling(fence_cookie);
 }
 
 static const struct drm_mode_config_helper_funcs imx_drm_mode_config_helpers = {
-- 
2.27.0


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

Re: [PATCH 09/25] drm/atmel: Use drm_atomic_helper_commit

[Sam Ravnborg]

Hi Daniel.

On Tue, Jul 07, 2020 at 10:12:13PM +0200, Daniel Vetter wrote:
> One of these drivers that predates the nonblocking support in helpers,
> and hand-rolled its own thing. Entirely not anything specific here, we
> can just delete it all and replace it with the helper version.
> 
> Could also perhaps use the drm_mode_config_helper_suspend/resume
> stuff, for another few lines deleted. But I'm not looking at that
> stuff, I'm just going through all the atomic commit functions and make
> sure they have properly annotated dma-fence critical sections
> everywhere.
> 
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> Cc: Sam Ravnborg <sam@ravnborg.org>
> Cc: Boris Brezillon <bbrezillon@kernel.org>
> Cc: Nicolas Ferre <nicolas.ferre@microchip.com>
> Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
> Cc: Ludovic Desroches <ludovic.desroches@microchip.com>
> Cc: linux-arm-kernel@lists.infradead.org

Looks good, nice to see all this code deleted!

This more or less matches what I had concluded.
But..

    atmel_hlcdc_dc.wq is no longer used - so can also be deleted.

This will delete even more code - good.

I will try to test the patch in the weekend.
Will get back if I suceed doing so.

	Sam

> ---
>  drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c | 96 +-------------------
>  drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h |  4 -
>  2 files changed, 1 insertion(+), 99 deletions(-)
> 
> diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
> index 871293d1aeeb..9ec156e98f06 100644
> --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
> @@ -557,103 +557,10 @@ static irqreturn_t atmel_hlcdc_dc_irq_handler(int irq, void *data)
>  	return IRQ_HANDLED;
>  }
>  
> -struct atmel_hlcdc_dc_commit {
> -	struct work_struct work;
> -	struct drm_device *dev;
> -	struct drm_atomic_state *state;
> -};
> -
> -static void
> -atmel_hlcdc_dc_atomic_complete(struct atmel_hlcdc_dc_commit *commit)
> -{
> -	struct drm_device *dev = commit->dev;
> -	struct atmel_hlcdc_dc *dc = dev->dev_private;
> -	struct drm_atomic_state *old_state = commit->state;
> -
> -	/* Apply the atomic update. */
> -	drm_atomic_helper_commit_modeset_disables(dev, old_state);
> -	drm_atomic_helper_commit_planes(dev, old_state, 0);
> -	drm_atomic_helper_commit_modeset_enables(dev, old_state);
> -
> -	drm_atomic_helper_wait_for_vblanks(dev, old_state);
> -
> -	drm_atomic_helper_cleanup_planes(dev, old_state);
> -
> -	drm_atomic_state_put(old_state);
> -
> -	/* Complete the commit, wake up any waiter. */
> -	spin_lock(&dc->commit.wait.lock);
> -	dc->commit.pending = false;
> -	wake_up_all_locked(&dc->commit.wait);
> -	spin_unlock(&dc->commit.wait.lock);
> -
> -	kfree(commit);
> -}
> -
> -static void atmel_hlcdc_dc_atomic_work(struct work_struct *work)
> -{
> -	struct atmel_hlcdc_dc_commit *commit =
> -		container_of(work, struct atmel_hlcdc_dc_commit, work);
> -
> -	atmel_hlcdc_dc_atomic_complete(commit);
> -}
> -
> -static int atmel_hlcdc_dc_atomic_commit(struct drm_device *dev,
> -					struct drm_atomic_state *state,
> -					bool async)
> -{
> -	struct atmel_hlcdc_dc *dc = dev->dev_private;
> -	struct atmel_hlcdc_dc_commit *commit;
> -	int ret;
> -
> -	ret = drm_atomic_helper_prepare_planes(dev, state);
> -	if (ret)
> -		return ret;
> -
> -	/* Allocate the commit object. */
> -	commit = kzalloc(sizeof(*commit), GFP_KERNEL);
> -	if (!commit) {
> -		ret = -ENOMEM;
> -		goto error;
> -	}
> -
> -	INIT_WORK(&commit->work, atmel_hlcdc_dc_atomic_work);
> -	commit->dev = dev;
> -	commit->state = state;
> -
> -	spin_lock(&dc->commit.wait.lock);
> -	ret = wait_event_interruptible_locked(dc->commit.wait,
> -					      !dc->commit.pending);
> -	if (ret == 0)
> -		dc->commit.pending = true;
> -	spin_unlock(&dc->commit.wait.lock);
> -
> -	if (ret)
> -		goto err_free;
> -
> -	/* We have our own synchronization through the commit lock. */
> -	BUG_ON(drm_atomic_helper_swap_state(state, false) < 0);
> -
> -	/* Swap state succeeded, this is the point of no return. */
> -	drm_atomic_state_get(state);
> -	if (async)
> -		queue_work(dc->wq, &commit->work);
> -	else
> -		atmel_hlcdc_dc_atomic_complete(commit);
> -
> -	return 0;
> -
> -err_free:
> -	kfree(commit);
> -error:
> -	drm_atomic_helper_cleanup_planes(dev, state);
> -	return ret;
> -}
> -
>  static const struct drm_mode_config_funcs mode_config_funcs = {
>  	.fb_create = drm_gem_fb_create,
>  	.atomic_check = drm_atomic_helper_check,
> -	.atomic_commit = atmel_hlcdc_dc_atomic_commit,
> +	.atomic_commit = drm_atomic_helper_commit,
>  };
>  
>  static int atmel_hlcdc_dc_modeset_init(struct drm_device *dev)
> @@ -716,7 +623,6 @@ static int atmel_hlcdc_dc_load(struct drm_device *dev)
>  	if (!dc->wq)
>  		return -ENOMEM;
>  
> -	init_waitqueue_head(&dc->commit.wait);
>  	dc->desc = match->data;
>  	dc->hlcdc = dev_get_drvdata(dev->dev->parent);
>  	dev->dev_private = dc;
> diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h
> index 469d4507e576..9367a3747a3a 100644
> --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h
> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h
> @@ -346,10 +346,6 @@ struct atmel_hlcdc_dc {
>  		u32 imr;
>  		struct drm_atomic_state *state;
>  	} suspend;
> -	struct {
> -		wait_queue_head_t wait;
> -		bool pending;
> -	} commit;
>  };
>  
>  extern struct atmel_hlcdc_formats atmel_hlcdc_plane_rgb_formats;
> -- 
> 2.27.0
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

[PATCH] drm/atmel: Use drm_atomic_helper_commit

[Daniel Vetter]

One of these drivers that predates the nonblocking support in helpers,
and hand-rolled its own thing. Entirely not anything specific here, we
can just delete it all and replace it with the helper version.

Could also perhaps use the drm_mode_config_helper_suspend/resume
stuff, for another few lines deleted. But I'm not looking at that
stuff, I'm just going through all the atomic commit functions and make
sure they have properly annotated dma-fence critical sections
everywhere.

v2:
- Also delete the workqueue (Sam)
- drop the @commit kerneldoc, I missed that one.

Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Boris Brezillon <bbrezillon@kernel.org>
Cc: Nicolas Ferre <nicolas.ferre@microchip.com>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc: Ludovic Desroches <ludovic.desroches@microchip.com>
Cc: linux-arm-kernel@lists.infradead.org
---
 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c | 107 +------------------
 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h |   7 --
 2 files changed, 2 insertions(+), 112 deletions(-)

diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
index 871293d1aeeb..03984932d174 100644
--- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
+++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
@@ -557,103 +557,10 @@ static irqreturn_t atmel_hlcdc_dc_irq_handler(int irq, void *data)
 	return IRQ_HANDLED;
 }
 
-struct atmel_hlcdc_dc_commit {
-	struct work_struct work;
-	struct drm_device *dev;
-	struct drm_atomic_state *state;
-};
-
-static void
-atmel_hlcdc_dc_atomic_complete(struct atmel_hlcdc_dc_commit *commit)
-{
-	struct drm_device *dev = commit->dev;
-	struct atmel_hlcdc_dc *dc = dev->dev_private;
-	struct drm_atomic_state *old_state = commit->state;
-
-	/* Apply the atomic update. */
-	drm_atomic_helper_commit_modeset_disables(dev, old_state);
-	drm_atomic_helper_commit_planes(dev, old_state, 0);
-	drm_atomic_helper_commit_modeset_enables(dev, old_state);
-
-	drm_atomic_helper_wait_for_vblanks(dev, old_state);
-
-	drm_atomic_helper_cleanup_planes(dev, old_state);
-
-	drm_atomic_state_put(old_state);
-
-	/* Complete the commit, wake up any waiter. */
-	spin_lock(&dc->commit.wait.lock);
-	dc->commit.pending = false;
-	wake_up_all_locked(&dc->commit.wait);
-	spin_unlock(&dc->commit.wait.lock);
-
-	kfree(commit);
-}
-
-static void atmel_hlcdc_dc_atomic_work(struct work_struct *work)
-{
-	struct atmel_hlcdc_dc_commit *commit =
-		container_of(work, struct atmel_hlcdc_dc_commit, work);
-
-	atmel_hlcdc_dc_atomic_complete(commit);
-}
-
-static int atmel_hlcdc_dc_atomic_commit(struct drm_device *dev,
-					struct drm_atomic_state *state,
-					bool async)
-{
-	struct atmel_hlcdc_dc *dc = dev->dev_private;
-	struct atmel_hlcdc_dc_commit *commit;
-	int ret;
-
-	ret = drm_atomic_helper_prepare_planes(dev, state);
-	if (ret)
-		return ret;
-
-	/* Allocate the commit object. */
-	commit = kzalloc(sizeof(*commit), GFP_KERNEL);
-	if (!commit) {
-		ret = -ENOMEM;
-		goto error;
-	}
-
-	INIT_WORK(&commit->work, atmel_hlcdc_dc_atomic_work);
-	commit->dev = dev;
-	commit->state = state;
-
-	spin_lock(&dc->commit.wait.lock);
-	ret = wait_event_interruptible_locked(dc->commit.wait,
-					      !dc->commit.pending);
-	if (ret == 0)
-		dc->commit.pending = true;
-	spin_unlock(&dc->commit.wait.lock);
-
-	if (ret)
-		goto err_free;
-
-	/* We have our own synchronization through the commit lock. */
-	BUG_ON(drm_atomic_helper_swap_state(state, false) < 0);
-
-	/* Swap state succeeded, this is the point of no return. */
-	drm_atomic_state_get(state);
-	if (async)
-		queue_work(dc->wq, &commit->work);
-	else
-		atmel_hlcdc_dc_atomic_complete(commit);
-
-	return 0;
-
-err_free:
-	kfree(commit);
-error:
-	drm_atomic_helper_cleanup_planes(dev, state);
-	return ret;
-}
-
 static const struct drm_mode_config_funcs mode_config_funcs = {
 	.fb_create = drm_gem_fb_create,
 	.atomic_check = drm_atomic_helper_check,
-	.atomic_commit = atmel_hlcdc_dc_atomic_commit,
+	.atomic_commit = drm_atomic_helper_commit,
 };
 
 static int atmel_hlcdc_dc_modeset_init(struct drm_device *dev)
@@ -712,11 +619,6 @@ static int atmel_hlcdc_dc_load(struct drm_device *dev)
 	if (!dc)
 		return -ENOMEM;
 
-	dc->wq = alloc_ordered_workqueue("atmel-hlcdc-dc", 0);
-	if (!dc->wq)
-		return -ENOMEM;
-
-	init_waitqueue_head(&dc->commit.wait);
 	dc->desc = match->data;
 	dc->hlcdc = dev_get_drvdata(dev->dev->parent);
 	dev->dev_private = dc;
@@ -724,7 +626,7 @@ static int atmel_hlcdc_dc_load(struct drm_device *dev)
 	ret = clk_prepare_enable(dc->hlcdc->periph_clk);
 	if (ret) {
 		dev_err(dev->dev, "failed to enable periph_clk\n");
-		goto err_destroy_wq;
+		return ret;
 	}
 
 	pm_runtime_enable(dev->dev);
@@ -761,9 +663,6 @@ static int atmel_hlcdc_dc_load(struct drm_device *dev)
 	pm_runtime_disable(dev->dev);
 	clk_disable_unprepare(dc->hlcdc->periph_clk);
 
-err_destroy_wq:
-	destroy_workqueue(dc->wq);
-
 	return ret;
 }
 
@@ -771,7 +670,6 @@ static void atmel_hlcdc_dc_unload(struct drm_device *dev)
 {
 	struct atmel_hlcdc_dc *dc = dev->dev_private;
 
-	flush_workqueue(dc->wq);
 	drm_kms_helper_poll_fini(dev);
 	drm_atomic_helper_shutdown(dev);
 	drm_mode_config_cleanup(dev);
@@ -784,7 +682,6 @@ static void atmel_hlcdc_dc_unload(struct drm_device *dev)
 
 	pm_runtime_disable(dev->dev);
 	clk_disable_unprepare(dc->hlcdc->periph_clk);
-	destroy_workqueue(dc->wq);
 }
 
 static int atmel_hlcdc_dc_irq_postinstall(struct drm_device *dev)
diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h
index 469d4507e576..5b5c774e0edf 100644
--- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h
+++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h
@@ -331,9 +331,7 @@ struct atmel_hlcdc_dc_desc {
  * @crtc: CRTC provided by the display controller
  * @planes: instantiated planes
  * @layers: active HLCDC layers
- * @wq: display controller workqueue
  * @suspend: used to store the HLCDC state when entering suspend
- * @commit: used for async commit handling
  */
 struct atmel_hlcdc_dc {
 	const struct atmel_hlcdc_dc_desc *desc;
@@ -341,15 +339,10 @@ struct atmel_hlcdc_dc {
 	struct atmel_hlcdc *hlcdc;
 	struct drm_crtc *crtc;
 	struct atmel_hlcdc_layer *layers[ATMEL_HLCDC_MAX_LAYERS];
-	struct workqueue_struct *wq;
 	struct {
 		u32 imr;
 		struct drm_atomic_state *state;
 	} suspend;
-	struct {
-		wait_queue_head_t wait;
-		bool pending;
-	} commit;
 };
 
 extern struct atmel_hlcdc_formats atmel_hlcdc_plane_rgb_formats;
-- 
2.27.0


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

Re: [PATCH] drm/atmel: Use drm_atomic_helper_commit

[Sam Ravnborg]

Hi Daniel.

On Tue, Jul 07, 2020 at 11:31:37PM +0200, Daniel Vetter wrote:
> One of these drivers that predates the nonblocking support in helpers,
> and hand-rolled its own thing. Entirely not anything specific here, we
> can just delete it all and replace it with the helper version.
> 
> Could also perhaps use the drm_mode_config_helper_suspend/resume
> stuff, for another few lines deleted. But I'm not looking at that
> stuff, I'm just going through all the atomic commit functions and make
> sure they have properly annotated dma-fence critical sections
> everywhere.
> 
> v2:
> - Also delete the workqueue (Sam)
> - drop the @commit kerneldoc, I missed that one.
> 
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> Cc: Sam Ravnborg <sam@ravnborg.org>
> Cc: Boris Brezillon <bbrezillon@kernel.org>
> Cc: Nicolas Ferre <nicolas.ferre@microchip.com>
> Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
> Cc: Ludovic Desroches <ludovic.desroches@microchip.com>
> Cc: linux-arm-kernel@lists.infradead.org
I did succeed getttign my board operational.
But based on reading the code:
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>

I assume you will apply it.

	Sam


> ---
>  drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c | 107 +------------------
>  drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h |   7 --
>  2 files changed, 2 insertions(+), 112 deletions(-)
> 
> diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
> index 871293d1aeeb..03984932d174 100644
> --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
> @@ -557,103 +557,10 @@ static irqreturn_t atmel_hlcdc_dc_irq_handler(int irq, void *data)
>  	return IRQ_HANDLED;
>  }
>  
> -struct atmel_hlcdc_dc_commit {
> -	struct work_struct work;
> -	struct drm_device *dev;
> -	struct drm_atomic_state *state;
> -};
> -
> -static void
> -atmel_hlcdc_dc_atomic_complete(struct atmel_hlcdc_dc_commit *commit)
> -{
> -	struct drm_device *dev = commit->dev;
> -	struct atmel_hlcdc_dc *dc = dev->dev_private;
> -	struct drm_atomic_state *old_state = commit->state;
> -
> -	/* Apply the atomic update. */
> -	drm_atomic_helper_commit_modeset_disables(dev, old_state);
> -	drm_atomic_helper_commit_planes(dev, old_state, 0);
> -	drm_atomic_helper_commit_modeset_enables(dev, old_state);
> -
> -	drm_atomic_helper_wait_for_vblanks(dev, old_state);
> -
> -	drm_atomic_helper_cleanup_planes(dev, old_state);
> -
> -	drm_atomic_state_put(old_state);
> -
> -	/* Complete the commit, wake up any waiter. */
> -	spin_lock(&dc->commit.wait.lock);
> -	dc->commit.pending = false;
> -	wake_up_all_locked(&dc->commit.wait);
> -	spin_unlock(&dc->commit.wait.lock);
> -
> -	kfree(commit);
> -}
> -
> -static void atmel_hlcdc_dc_atomic_work(struct work_struct *work)
> -{
> -	struct atmel_hlcdc_dc_commit *commit =
> -		container_of(work, struct atmel_hlcdc_dc_commit, work);
> -
> -	atmel_hlcdc_dc_atomic_complete(commit);
> -}
> -
> -static int atmel_hlcdc_dc_atomic_commit(struct drm_device *dev,
> -					struct drm_atomic_state *state,
> -					bool async)
> -{
> -	struct atmel_hlcdc_dc *dc = dev->dev_private;
> -	struct atmel_hlcdc_dc_commit *commit;
> -	int ret;
> -
> -	ret = drm_atomic_helper_prepare_planes(dev, state);
> -	if (ret)
> -		return ret;
> -
> -	/* Allocate the commit object. */
> -	commit = kzalloc(sizeof(*commit), GFP_KERNEL);
> -	if (!commit) {
> -		ret = -ENOMEM;
> -		goto error;
> -	}
> -
> -	INIT_WORK(&commit->work, atmel_hlcdc_dc_atomic_work);
> -	commit->dev = dev;
> -	commit->state = state;
> -
> -	spin_lock(&dc->commit.wait.lock);
> -	ret = wait_event_interruptible_locked(dc->commit.wait,
> -					      !dc->commit.pending);
> -	if (ret == 0)
> -		dc->commit.pending = true;
> -	spin_unlock(&dc->commit.wait.lock);
> -
> -	if (ret)
> -		goto err_free;
> -
> -	/* We have our own synchronization through the commit lock. */
> -	BUG_ON(drm_atomic_helper_swap_state(state, false) < 0);
> -
> -	/* Swap state succeeded, this is the point of no return. */
> -	drm_atomic_state_get(state);
> -	if (async)
> -		queue_work(dc->wq, &commit->work);
> -	else
> -		atmel_hlcdc_dc_atomic_complete(commit);
> -
> -	return 0;
> -
> -err_free:
> -	kfree(commit);
> -error:
> -	drm_atomic_helper_cleanup_planes(dev, state);
> -	return ret;
> -}
> -
>  static const struct drm_mode_config_funcs mode_config_funcs = {
>  	.fb_create = drm_gem_fb_create,
>  	.atomic_check = drm_atomic_helper_check,
> -	.atomic_commit = atmel_hlcdc_dc_atomic_commit,
> +	.atomic_commit = drm_atomic_helper_commit,
>  };
>  
>  static int atmel_hlcdc_dc_modeset_init(struct drm_device *dev)
> @@ -712,11 +619,6 @@ static int atmel_hlcdc_dc_load(struct drm_device *dev)
>  	if (!dc)
>  		return -ENOMEM;
>  
> -	dc->wq = alloc_ordered_workqueue("atmel-hlcdc-dc", 0);
> -	if (!dc->wq)
> -		return -ENOMEM;
> -
> -	init_waitqueue_head(&dc->commit.wait);
>  	dc->desc = match->data;
>  	dc->hlcdc = dev_get_drvdata(dev->dev->parent);
>  	dev->dev_private = dc;
> @@ -724,7 +626,7 @@ static int atmel_hlcdc_dc_load(struct drm_device *dev)
>  	ret = clk_prepare_enable(dc->hlcdc->periph_clk);
>  	if (ret) {
>  		dev_err(dev->dev, "failed to enable periph_clk\n");
> -		goto err_destroy_wq;
> +		return ret;
>  	}
>  
>  	pm_runtime_enable(dev->dev);
> @@ -761,9 +663,6 @@ static int atmel_hlcdc_dc_load(struct drm_device *dev)
>  	pm_runtime_disable(dev->dev);
>  	clk_disable_unprepare(dc->hlcdc->periph_clk);
>  
> -err_destroy_wq:
> -	destroy_workqueue(dc->wq);
> -
>  	return ret;
>  }
>  
> @@ -771,7 +670,6 @@ static void atmel_hlcdc_dc_unload(struct drm_device *dev)
>  {
>  	struct atmel_hlcdc_dc *dc = dev->dev_private;
>  
> -	flush_workqueue(dc->wq);
>  	drm_kms_helper_poll_fini(dev);
>  	drm_atomic_helper_shutdown(dev);
>  	drm_mode_config_cleanup(dev);
> @@ -784,7 +682,6 @@ static void atmel_hlcdc_dc_unload(struct drm_device *dev)
>  
>  	pm_runtime_disable(dev->dev);
>  	clk_disable_unprepare(dc->hlcdc->periph_clk);
> -	destroy_workqueue(dc->wq);
>  }
>  
>  static int atmel_hlcdc_dc_irq_postinstall(struct drm_device *dev)
> diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h
> index 469d4507e576..5b5c774e0edf 100644
> --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h
> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h
> @@ -331,9 +331,7 @@ struct atmel_hlcdc_dc_desc {
>   * @crtc: CRTC provided by the display controller
>   * @planes: instantiated planes
>   * @layers: active HLCDC layers
> - * @wq: display controller workqueue
>   * @suspend: used to store the HLCDC state when entering suspend
> - * @commit: used for async commit handling
>   */
>  struct atmel_hlcdc_dc {
>  	const struct atmel_hlcdc_dc_desc *desc;
> @@ -341,15 +339,10 @@ struct atmel_hlcdc_dc {
>  	struct atmel_hlcdc *hlcdc;
>  	struct drm_crtc *crtc;
>  	struct atmel_hlcdc_layer *layers[ATMEL_HLCDC_MAX_LAYERS];
> -	struct workqueue_struct *wq;
>  	struct {
>  		u32 imr;
>  		struct drm_atomic_state *state;
>  	} suspend;
> -	struct {
> -		wait_queue_head_t wait;
> -		bool pending;
> -	} commit;
>  };
>  
>  extern struct atmel_hlcdc_formats atmel_hlcdc_plane_rgb_formats;
> -- 
> 2.27.0
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel