| Message ID | 20241211034716.29241-1-jason-jh.lin@mediatek.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v4] drm/mediatek: Move mtk_crtc_finish_page_flip() to ddp_cmdq_cb() | expand |
Hi, Jason: On Wed, 2024-12-11 at 11:47 +0800, Jason-JH.Lin wrote: > mtk_crtc_finish_page_flip() is used to notify userspace that a > page flip has been completed, allowing userspace to free the frame > buffer of the last frame and commit the next frame. > > In MediaTek's hardware design for configuring display hardware by using > GCE, `DRM_EVENT_FLIP_COMPLETE` should be notified to userspace after > GCE has finished configuring all display hardware settings for each > atomic_commit(). > > Currently, mtk_crtc_finish_page_flip() cannot guarantee that GCE has > configured all the display hardware settings of the last frame. > Therefore, to increase the accuracy of the timing for notifying > `DRM_EVENT_FLIP_COMPLETE` to userspace, mtk_crtc_finish_page_flip() > should be moved to ddp_cmdq_cb(). Reviewed-by: CK Hu <ck.hu@mediatek.com> > > Fixes: 7f82d9c43879 ("drm/mediatek: Clear pending flag when cmdq packet is done") > Signed-off-by: Jason-JH.Lin <jason-jh.lin@mediatek.com> > --- > drivers/gpu/drm/mediatek/mtk_crtc.c | 25 +++++++++++++++++++------ > 1 file changed, 19 insertions(+), 6 deletions(-) > > diff --git a/drivers/gpu/drm/mediatek/mtk_crtc.c b/drivers/gpu/drm/mediatek/mtk_crtc.c > index eb0e1233ad04..5674f5707cca 100644 > --- a/drivers/gpu/drm/mediatek/mtk_crtc.c > +++ b/drivers/gpu/drm/mediatek/mtk_crtc.c > @@ -112,6 +112,11 @@ static void mtk_drm_finish_page_flip(struct mtk_crtc *mtk_crtc) > > drm_crtc_handle_vblank(&mtk_crtc->base); > > +#if IS_REACHABLE(CONFIG_MTK_CMDQ) > + if (mtk_crtc->cmdq_client.chan) > + return; > +#endif > + > spin_lock_irqsave(&mtk_crtc->config_lock, flags); > if (!mtk_crtc->config_updating && mtk_crtc->pending_needs_vblank) { > mtk_crtc_finish_page_flip(mtk_crtc); > @@ -284,10 +289,8 @@ static void ddp_cmdq_cb(struct mbox_client *cl, void *mssg) > state = to_mtk_crtc_state(mtk_crtc->base.state); > > spin_lock_irqsave(&mtk_crtc->config_lock, flags); > - if (mtk_crtc->config_updating) { > - spin_unlock_irqrestore(&mtk_crtc->config_lock, flags); > + if (mtk_crtc->config_updating) > goto ddp_cmdq_cb_out; > - } > > state->pending_config = false; > > @@ -315,10 +318,15 @@ static void ddp_cmdq_cb(struct mbox_client *cl, void *mssg) > mtk_crtc->pending_async_planes = false; > } > > - spin_unlock_irqrestore(&mtk_crtc->config_lock, flags); > - > ddp_cmdq_cb_out: > > + if (mtk_crtc->pending_needs_vblank) { > + mtk_crtc_finish_page_flip(mtk_crtc); > + mtk_crtc->pending_needs_vblank = false; > + } > + > + spin_unlock_irqrestore(&mtk_crtc->config_lock, flags); > + > mtk_crtc->cmdq_vblank_cnt = 0; > wake_up(&mtk_crtc->cb_blocking_queue); > } > @@ -606,13 +614,18 @@ static void mtk_crtc_update_config(struct mtk_crtc *mtk_crtc, bool needs_vblank) > */ > mtk_crtc->cmdq_vblank_cnt = 3; > > + spin_lock_irqsave(&mtk_crtc->config_lock, flags); > + mtk_crtc->config_updating = false; > + spin_unlock_irqrestore(&mtk_crtc->config_lock, flags); > + > mbox_send_message(mtk_crtc->cmdq_client.chan, cmdq_handle); > mbox_client_txdone(mtk_crtc->cmdq_client.chan, 0); > } > -#endif > +#else > spin_lock_irqsave(&mtk_crtc->config_lock, flags); > mtk_crtc->config_updating = false; > spin_unlock_irqrestore(&mtk_crtc->config_lock, flags); > +#endif > > mutex_unlock(&mtk_crtc->hw_lock); > }
Hi, Jason: Jason-JH.Lin <jason-jh.lin@mediatek.com> 於 2024年12月11日 週三 上午11:47寫道： > > mtk_crtc_finish_page_flip() is used to notify userspace that a > page flip has been completed, allowing userspace to free the frame > buffer of the last frame and commit the next frame. > > In MediaTek's hardware design for configuring display hardware by using > GCE, `DRM_EVENT_FLIP_COMPLETE` should be notified to userspace after > GCE has finished configuring all display hardware settings for each > atomic_commit(). > > Currently, mtk_crtc_finish_page_flip() cannot guarantee that GCE has > configured all the display hardware settings of the last frame. > Therefore, to increase the accuracy of the timing for notifying > `DRM_EVENT_FLIP_COMPLETE` to userspace, mtk_crtc_finish_page_flip() > should be moved to ddp_cmdq_cb(). Applied to mediatek-drm-fixes [1], thanks. [1] https://git.kernel.org/pub/scm/linux/kernel/git/chunkuang.hu/linux.git/log/?h=mediatek-drm-fixes Regards, Chun-Kuang. > > Fixes: 7f82d9c43879 ("drm/mediatek: Clear pending flag when cmdq packet is done") > Signed-off-by: Jason-JH.Lin <jason-jh.lin@mediatek.com> > --- > drivers/gpu/drm/mediatek/mtk_crtc.c | 25 +++++++++++++++++++------ > 1 file changed, 19 insertions(+), 6 deletions(-) > > diff --git a/drivers/gpu/drm/mediatek/mtk_crtc.c b/drivers/gpu/drm/mediatek/mtk_crtc.c > index eb0e1233ad04..5674f5707cca 100644 > --- a/drivers/gpu/drm/mediatek/mtk_crtc.c > +++ b/drivers/gpu/drm/mediatek/mtk_crtc.c > @@ -112,6 +112,11 @@ static void mtk_drm_finish_page_flip(struct mtk_crtc *mtk_crtc) > > drm_crtc_handle_vblank(&mtk_crtc->base); > > +#if IS_REACHABLE(CONFIG_MTK_CMDQ) > + if (mtk_crtc->cmdq_client.chan) > + return; > +#endif > + > spin_lock_irqsave(&mtk_crtc->config_lock, flags); > if (!mtk_crtc->config_updating && mtk_crtc->pending_needs_vblank) { > mtk_crtc_finish_page_flip(mtk_crtc); > @@ -284,10 +289,8 @@ static void ddp_cmdq_cb(struct mbox_client *cl, void *mssg) > state = to_mtk_crtc_state(mtk_crtc->base.state); > > spin_lock_irqsave(&mtk_crtc->config_lock, flags); > - if (mtk_crtc->config_updating) { > - spin_unlock_irqrestore(&mtk_crtc->config_lock, flags); > + if (mtk_crtc->config_updating) > goto ddp_cmdq_cb_out; > - } > > state->pending_config = false; > > @@ -315,10 +318,15 @@ static void ddp_cmdq_cb(struct mbox_client *cl, void *mssg) > mtk_crtc->pending_async_planes = false; > } > > - spin_unlock_irqrestore(&mtk_crtc->config_lock, flags); > - > ddp_cmdq_cb_out: > > + if (mtk_crtc->pending_needs_vblank) { > + mtk_crtc_finish_page_flip(mtk_crtc); > + mtk_crtc->pending_needs_vblank = false; > + } > + > + spin_unlock_irqrestore(&mtk_crtc->config_lock, flags); > + > mtk_crtc->cmdq_vblank_cnt = 0; > wake_up(&mtk_crtc->cb_blocking_queue); > } > @@ -606,13 +614,18 @@ static void mtk_crtc_update_config(struct mtk_crtc *mtk_crtc, bool needs_vblank) > */ > mtk_crtc->cmdq_vblank_cnt = 3; > > + spin_lock_irqsave(&mtk_crtc->config_lock, flags); > + mtk_crtc->config_updating = false; > + spin_unlock_irqrestore(&mtk_crtc->config_lock, flags); > + > mbox_send_message(mtk_crtc->cmdq_client.chan, cmdq_handle); > mbox_client_txdone(mtk_crtc->cmdq_client.chan, 0); > } > -#endif > +#else > spin_lock_irqsave(&mtk_crtc->config_lock, flags); > mtk_crtc->config_updating = false; > spin_unlock_irqrestore(&mtk_crtc->config_lock, flags); > +#endif > > mutex_unlock(&mtk_crtc->hw_lock); > } > -- > 2.43.0 >
diff --git a/drivers/gpu/drm/mediatek/mtk_crtc.c b/drivers/gpu/drm/mediatek/mtk_crtc.c index eb0e1233ad04..5674f5707cca 100644 --- a/drivers/gpu/drm/mediatek/mtk_crtc.c +++ b/drivers/gpu/drm/mediatek/mtk_crtc.c @@ -112,6 +112,11 @@ static void mtk_drm_finish_page_flip(struct mtk_crtc *mtk_crtc) drm_crtc_handle_vblank(&mtk_crtc->base); +#if IS_REACHABLE(CONFIG_MTK_CMDQ) + if (mtk_crtc->cmdq_client.chan) + return; +#endif + spin_lock_irqsave(&mtk_crtc->config_lock, flags); if (!mtk_crtc->config_updating && mtk_crtc->pending_needs_vblank) { mtk_crtc_finish_page_flip(mtk_crtc); @@ -284,10 +289,8 @@ static void ddp_cmdq_cb(struct mbox_client *cl, void *mssg) state = to_mtk_crtc_state(mtk_crtc->base.state); spin_lock_irqsave(&mtk_crtc->config_lock, flags); - if (mtk_crtc->config_updating) { - spin_unlock_irqrestore(&mtk_crtc->config_lock, flags); + if (mtk_crtc->config_updating) goto ddp_cmdq_cb_out; - } state->pending_config = false; @@ -315,10 +318,15 @@ static void ddp_cmdq_cb(struct mbox_client *cl, void *mssg) mtk_crtc->pending_async_planes = false; } - spin_unlock_irqrestore(&mtk_crtc->config_lock, flags); - ddp_cmdq_cb_out: + if (mtk_crtc->pending_needs_vblank) { + mtk_crtc_finish_page_flip(mtk_crtc); + mtk_crtc->pending_needs_vblank = false; + } + + spin_unlock_irqrestore(&mtk_crtc->config_lock, flags); + mtk_crtc->cmdq_vblank_cnt = 0; wake_up(&mtk_crtc->cb_blocking_queue); } @@ -606,13 +614,18 @@ static void mtk_crtc_update_config(struct mtk_crtc *mtk_crtc, bool needs_vblank) */ mtk_crtc->cmdq_vblank_cnt = 3; + spin_lock_irqsave(&mtk_crtc->config_lock, flags); + mtk_crtc->config_updating = false; + spin_unlock_irqrestore(&mtk_crtc->config_lock, flags); + mbox_send_message(mtk_crtc->cmdq_client.chan, cmdq_handle); mbox_client_txdone(mtk_crtc->cmdq_client.chan, 0); } -#endif +#else spin_lock_irqsave(&mtk_crtc->config_lock, flags); mtk_crtc->config_updating = false; spin_unlock_irqrestore(&mtk_crtc->config_lock, flags); +#endif mutex_unlock(&mtk_crtc->hw_lock); }
mtk_crtc_finish_page_flip() is used to notify userspace that a page flip has been completed, allowing userspace to free the frame buffer of the last frame and commit the next frame. In MediaTek's hardware design for configuring display hardware by using GCE, `DRM_EVENT_FLIP_COMPLETE` should be notified to userspace after GCE has finished configuring all display hardware settings for each atomic_commit(). Currently, mtk_crtc_finish_page_flip() cannot guarantee that GCE has configured all the display hardware settings of the last frame. Therefore, to increase the accuracy of the timing for notifying `DRM_EVENT_FLIP_COMPLETE` to userspace, mtk_crtc_finish_page_flip() should be moved to ddp_cmdq_cb(). Fixes: 7f82d9c43879 ("drm/mediatek: Clear pending flag when cmdq packet is done") Signed-off-by: Jason-JH.Lin <jason-jh.lin@mediatek.com> --- drivers/gpu/drm/mediatek/mtk_crtc.c | 25 +++++++++++++++++++------ 1 file changed, 19 insertions(+), 6 deletions(-)