Hi Laurent,
On 05/04/18 10:18, Laurent Pinchart wrote:
> Display list completion is already reported to the frame end handler,
> but that mechanism is global to all display lists. In order to implement
> BRU and BRS reassignment in DRM pipelines we will need to commit a
> display list and wait for its completion internally, without reporting
> it to the DRM driver. Extend the display list API to support such an
> internal use of the display list.
>
> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx>
> ---
> Changes since v1:
>
> - Use the frame end status flags to report notification
> - Rename the notify flag to internal
This reads much better to me.
Thanks for the respin.
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@xxxxxxxxxxxxxxxx>
> ---
> drivers/media/platform/vsp1/vsp1_dl.c | 23 ++++++++++++++++++++++-
> drivers/media/platform/vsp1/vsp1_dl.h | 3 ++-
> drivers/media/platform/vsp1/vsp1_drm.c | 2 +-
> drivers/media/platform/vsp1/vsp1_video.c | 2 +-
> 4 files changed, 26 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/media/platform/vsp1/vsp1_dl.c b/drivers/media/platform/vsp1/vsp1_dl.c
> index 662fa2a347c9..30ad491605ff 100644
> --- a/drivers/media/platform/vsp1/vsp1_dl.c
> +++ b/drivers/media/platform/vsp1/vsp1_dl.c
> @@ -72,6 +72,7 @@ struct vsp1_dl_body {
> * @fragments: list of extra display list bodies
> * @has_chain: if true, indicates that there's a partition chain
> * @chain: entry in the display list partition chain
> + * @internal: whether the display list is used for internal purpose
> */
> struct vsp1_dl_list {
> struct list_head list;
> @@ -85,6 +86,8 @@ struct vsp1_dl_list {
>
> bool has_chain;
> struct list_head chain;
> +
> + bool internal;
> };
>
> enum vsp1_dl_mode {
> @@ -550,8 +553,16 @@ static void vsp1_dl_list_commit_continuous(struct vsp1_dl_list *dl)
> * case we can't replace the queued list by the new one, as we could
> * race with the hardware. We thus mark the update as pending, it will
> * be queued up to the hardware by the frame end interrupt handler.
> + *
> + * If a display list is already pending we simply drop it as the new
> + * display list is assumed to contain a more recent configuration. It is
> + * an error if the already pending list has the internal flag set, as
> + * there is then a process waiting for that list to complete. This
> + * shouldn't happen as the waiting process should perform proper
> + * locking, but warn just in case.
> */
> if (vsp1_dl_list_hw_update_pending(dlm)) {
> + WARN_ON(dlm->pending && dlm->pending->internal);
> __vsp1_dl_list_put(dlm->pending);
> dlm->pending = dl;
> return;
> @@ -581,7 +592,7 @@ static void vsp1_dl_list_commit_singleshot(struct vsp1_dl_list *dl)
> dlm->active = dl;
> }
>
> -void vsp1_dl_list_commit(struct vsp1_dl_list *dl)
> +void vsp1_dl_list_commit(struct vsp1_dl_list *dl, bool internal)
> {
> struct vsp1_dl_manager *dlm = dl->dlm;
> struct vsp1_dl_list *dl_child;
> @@ -598,6 +609,8 @@ void vsp1_dl_list_commit(struct vsp1_dl_list *dl)
> }
> }
>
> + dl->internal = internal;
> +
> spin_lock_irqsave(&dlm->lock, flags);
>
> if (dlm->singleshot)
> @@ -624,6 +637,10 @@ void vsp1_dl_list_commit(struct vsp1_dl_list *dl)
> * raced with the frame end interrupt. The function always returns with the flag
> * set in header mode as display list processing is then not continuous and
> * races never occur.
> + *
> + * The VSP1_DL_FRAME_END_INTERNAL flag indicates that the previous display list
> + * has completed and had been queued with the internal notification flag.
> + * Internal notification is only supported for continuous mode.
> */
> unsigned int vsp1_dlm_irq_frame_end(struct vsp1_dl_manager *dlm)
> {
> @@ -656,6 +673,10 @@ unsigned int vsp1_dlm_irq_frame_end(struct vsp1_dl_manager *dlm)
> * frame end interrupt. The display list thus becomes active.
> */
> if (dlm->queued) {
> + if (dlm->queued->internal)
> + flags |= VSP1_DL_FRAME_END_INTERNAL;
> + dlm->queued->internal = false;
> +
> __vsp1_dl_list_put(dlm->active);
> dlm->active = dlm->queued;
> dlm->queued = NULL;
> diff --git a/drivers/media/platform/vsp1/vsp1_dl.h b/drivers/media/platform/vsp1/vsp1_dl.h
> index cbc2fc53e10b..1a5bbd5ddb7b 100644
> --- a/drivers/media/platform/vsp1/vsp1_dl.h
> +++ b/drivers/media/platform/vsp1/vsp1_dl.h
> @@ -21,6 +21,7 @@ struct vsp1_dl_list;
> struct vsp1_dl_manager;
>
> #define VSP1_DL_FRAME_END_COMPLETED BIT(0)
> +#define VSP1_DL_FRAME_END_INTERNAL BIT(1)
>
> void vsp1_dlm_setup(struct vsp1_device *vsp1);
>
> @@ -34,7 +35,7 @@ unsigned int vsp1_dlm_irq_frame_end(struct vsp1_dl_manager *dlm);
> struct vsp1_dl_list *vsp1_dl_list_get(struct vsp1_dl_manager *dlm);
> void vsp1_dl_list_put(struct vsp1_dl_list *dl);
> void vsp1_dl_list_write(struct vsp1_dl_list *dl, u32 reg, u32 data);
> -void vsp1_dl_list_commit(struct vsp1_dl_list *dl);
> +void vsp1_dl_list_commit(struct vsp1_dl_list *dl, bool internal);
>
> struct vsp1_dl_body *vsp1_dl_fragment_alloc(struct vsp1_device *vsp1,
> unsigned int num_entries);
> diff --git a/drivers/media/platform/vsp1/vsp1_drm.c b/drivers/media/platform/vsp1/vsp1_drm.c
> index 541473b1df67..68b126044ea1 100644
> --- a/drivers/media/platform/vsp1/vsp1_drm.c
> +++ b/drivers/media/platform/vsp1/vsp1_drm.c
> @@ -370,7 +370,7 @@ static void vsp1_du_pipeline_configure(struct vsp1_pipeline *pipe)
> }
> }
>
> - vsp1_dl_list_commit(dl);
> + vsp1_dl_list_commit(dl, false);
> }
>
> /* -----------------------------------------------------------------------------
> diff --git a/drivers/media/platform/vsp1/vsp1_video.c b/drivers/media/platform/vsp1/vsp1_video.c
> index 4152704c2ccb..a76a44698aff 100644
> --- a/drivers/media/platform/vsp1/vsp1_video.c
> +++ b/drivers/media/platform/vsp1/vsp1_video.c
> @@ -437,7 +437,7 @@ static void vsp1_video_pipeline_run(struct vsp1_pipeline *pipe)
> }
>
> /* Complete, and commit the head display list. */
> - vsp1_dl_list_commit(pipe->dl);
> + vsp1_dl_list_commit(pipe->dl, false);
> pipe->dl = NULL;
>
> vsp1_pipeline_run(pipe);
>
