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@xxxxxxxxx>
> Cc: Sam Ravnborg <sam@xxxxxxxxxxxx>
> Cc: Boris Brezillon <bbrezillon@xxxxxxxxxx>
> Cc: Nicolas Ferre <nicolas.ferre@xxxxxxxxxxxxx>
> Cc: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxx>
> Cc: Ludovic Desroches <ludovic.desroches@xxxxxxxxxxxxx>
> Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
I did succeed getttign my board operational.
But based on reading the code:
Reviewed-by: Sam Ravnborg <sam@xxxxxxxxxxxx>
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
>
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