[PATCH] drm: Introduce a drm_crtc_commit_wait helper
Daniel Vetter
daniel.vetter at ffwll.ch
Thu Dec 17 14:58:33 UTC 2020
On Thu, Dec 17, 2020 at 3:43 PM Maxime Ripard <maxime at cerno.tech> wrote:
>
> There's currently four users of the same logic to wait for a commit to
> be flipped: three for the CRTCs, connectors and planes in
> drm_atomic_helper_wait_for_dependencies, and one in vc4.
>
> Let's consolidate this a bit to avoid any code duplication.
>
> Suggested-by: Daniel Vetter <daniel.vetter at ffwll.ch>
> Signed-off-by: Maxime Ripard <maxime at cerno.tech>
Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>
I did ponder for a bit whether this is in a good spot or not, maybe a
drm_crtc_commit.[hc] would be neat but still feels a bit like
overkill. Maybe add a quick sentence to the struct drm_crtc_commit
pointing at this new function, like "See also drm_crtc_commit_wait()"?
-Daniel
> ---
> drivers/gpu/drm/drm_atomic.c | 39 ++++++++++++++++++
> drivers/gpu/drm/drm_atomic_helper.c | 61 +++++------------------------
> drivers/gpu/drm/vc4/vc4_kms.c | 17 ++------
> include/drm/drm_atomic.h | 2 +
> 4 files changed, 54 insertions(+), 65 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
> index b2d20eb6c807..e2ab6564535c 100644
> --- a/drivers/gpu/drm/drm_atomic.c
> +++ b/drivers/gpu/drm/drm_atomic.c
> @@ -52,6 +52,45 @@ void __drm_crtc_commit_free(struct kref *kref)
> }
> EXPORT_SYMBOL(__drm_crtc_commit_free);
>
> +/**
> + * drm_crtc_commit_wait - Waits for a commit to complete
> + * @commit: &drm_crtc_commit to wait for
> + *
> + * Waits for a given &drm_crtc_commit to be programmed into the
> + * hardware and flipped to.
> + *
> + * Returns:
> + *
> + * 0 on success, a negative error code otherwise.
> + */
> +int drm_crtc_commit_wait(struct drm_crtc_commit *commit)
> +{
> + unsigned long timeout = 10 * HZ;
> + int ret;
> +
> + if (!commit)
> + return 0;
> +
> + ret = wait_for_completion_timeout(&commit->hw_done, timeout);
> + if (!ret) {
> + DRM_ERROR("hw_done timed out\n");
> + return -ETIMEDOUT;
> + }
> +
> + /*
> + * Currently no support for overwriting flips, hence
> + * stall for previous one to execute completely.
> + */
> + ret = wait_for_completion_timeout(&commit->flip_done, timeout);
> + if (!ret) {
> + DRM_ERROR("flip_done timed out\n");
> + return -ETIMEDOUT;
> + }
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(drm_crtc_commit_wait);
> +
> /**
> * drm_atomic_state_default_release -
> * release memory initialized by drm_atomic_state_init
> diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
> index a84dc427cf82..9fa3f97223a1 100644
> --- a/drivers/gpu/drm/drm_atomic_helper.c
> +++ b/drivers/gpu/drm/drm_atomic_helper.c
> @@ -2202,70 +2202,27 @@ void drm_atomic_helper_wait_for_dependencies(struct drm_atomic_state *old_state)
> struct drm_plane_state *old_plane_state;
> struct drm_connector *conn;
> struct drm_connector_state *old_conn_state;
> - struct drm_crtc_commit *commit;
> int i;
> long ret;
>
> for_each_old_crtc_in_state(old_state, crtc, old_crtc_state, i) {
> - commit = old_crtc_state->commit;
> -
> - if (!commit)
> - continue;
> -
> - ret = wait_for_completion_timeout(&commit->hw_done,
> - 10*HZ);
> - if (ret == 0)
> - DRM_ERROR("[CRTC:%d:%s] hw_done timed out\n",
> - crtc->base.id, crtc->name);
> -
> - /* Currently no support for overwriting flips, hence
> - * stall for previous one to execute completely. */
> - ret = wait_for_completion_timeout(&commit->flip_done,
> - 10*HZ);
> - if (ret == 0)
> - DRM_ERROR("[CRTC:%d:%s] flip_done timed out\n",
> + ret = drm_crtc_commit_wait(old_crtc_state->commit);
> + if (ret)
> + DRM_ERROR("[CRTC:%d:%s] commit wait timed out\n",
> crtc->base.id, crtc->name);
> }
>
> for_each_old_connector_in_state(old_state, conn, old_conn_state, i) {
> - commit = old_conn_state->commit;
> -
> - if (!commit)
> - continue;
> -
> - ret = wait_for_completion_timeout(&commit->hw_done,
> - 10*HZ);
> - if (ret == 0)
> - DRM_ERROR("[CONNECTOR:%d:%s] hw_done timed out\n",
> - conn->base.id, conn->name);
> -
> - /* Currently no support for overwriting flips, hence
> - * stall for previous one to execute completely. */
> - ret = wait_for_completion_timeout(&commit->flip_done,
> - 10*HZ);
> - if (ret == 0)
> - DRM_ERROR("[CONNECTOR:%d:%s] flip_done timed out\n",
> + ret = drm_crtc_commit_wait(old_conn_state->commit);
> + if (ret)
> + DRM_ERROR("[CONNECTOR:%d:%s] commit wait timed out\n",
> conn->base.id, conn->name);
> }
>
> for_each_old_plane_in_state(old_state, plane, old_plane_state, i) {
> - commit = old_plane_state->commit;
> -
> - if (!commit)
> - continue;
> -
> - ret = wait_for_completion_timeout(&commit->hw_done,
> - 10*HZ);
> - if (ret == 0)
> - DRM_ERROR("[PLANE:%d:%s] hw_done timed out\n",
> - plane->base.id, plane->name);
> -
> - /* Currently no support for overwriting flips, hence
> - * stall for previous one to execute completely. */
> - ret = wait_for_completion_timeout(&commit->flip_done,
> - 10*HZ);
> - if (ret == 0)
> - DRM_ERROR("[PLANE:%d:%s] flip_done timed out\n",
> + ret = drm_crtc_commit_wait(old_plane_state->commit);
> + if (ret)
> + DRM_ERROR("[PLANE:%d:%s] commit wait timed out\n",
> plane->base.id, plane->name);
> }
> }
> diff --git a/drivers/gpu/drm/vc4/vc4_kms.c b/drivers/gpu/drm/vc4/vc4_kms.c
> index f09254c2497d..bb5529a7a9c2 100644
> --- a/drivers/gpu/drm/vc4/vc4_kms.c
> +++ b/drivers/gpu/drm/vc4/vc4_kms.c
> @@ -363,9 +363,8 @@ static void vc4_atomic_commit_tail(struct drm_atomic_state *state)
> for_each_old_crtc_in_state(state, crtc, old_crtc_state, i) {
> struct vc4_crtc_state *vc4_crtc_state =
> to_vc4_crtc_state(old_crtc_state);
> - struct drm_crtc_commit *commit;
> unsigned int channel = vc4_crtc_state->assigned_channel;
> - unsigned long done;
> + int ret;
>
> if (channel == VC4_HVS_CHANNEL_DISABLED)
> continue;
> @@ -373,17 +372,9 @@ static void vc4_atomic_commit_tail(struct drm_atomic_state *state)
> if (!old_hvs_state->fifo_state[channel].in_use)
> continue;
>
> - commit = old_hvs_state->fifo_state[i].pending_commit;
> - if (!commit)
> - continue;
> -
> - done = wait_for_completion_timeout(&commit->hw_done, 10 * HZ);
> - if (!done)
> - drm_err(dev, "Timed out waiting for hw_done\n");
> -
> - done = wait_for_completion_timeout(&commit->flip_done, 10 * HZ);
> - if (!done)
> - drm_err(dev, "Timed out waiting for flip_done\n");
> + ret = drm_crtc_commit_wait(old_hvs_state->fifo_state[i].pending_commit);
> + if (ret)
> + drm_err(dev, "Timed out waiting for commit\n");
> }
>
> drm_atomic_helper_commit_modeset_disables(dev, state);
> diff --git a/include/drm/drm_atomic.h b/include/drm/drm_atomic.h
> index ce7023e9115d..79ef992c433d 100644
> --- a/include/drm/drm_atomic.h
> +++ b/include/drm/drm_atomic.h
> @@ -436,6 +436,8 @@ static inline void drm_crtc_commit_put(struct drm_crtc_commit *commit)
> kref_put(&commit->ref, __drm_crtc_commit_free);
> }
>
> +int drm_crtc_commit_wait(struct drm_crtc_commit *commit);
> +
> struct drm_atomic_state * __must_check
> drm_atomic_state_alloc(struct drm_device *dev);
> void drm_atomic_state_clear(struct drm_atomic_state *state);
> --
> 2.29.2
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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