Re: [PATCH v4 1/2] drm/mediatek: add wait_for_event for crtc disable by cmdq

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* Re: [PATCH v4 1/2] drm/mediatek: add wait_for_event for crtc disable by cmdq
       [not found] ` <20211202064039.20797-2-jason-jh.lin@mediatek.com>
@ 2021-12-02 23:21   ` Chun-Kuang Hu
  2022-02-27  3:36     ` Chun-Kuang Hu
  0 siblings, 1 reply; 5+ messages in thread
From: Chun-Kuang Hu @ 2021-12-02 23:21 UTC (permalink / raw)
  To: jason-jh.lin
  Cc: Chun-Kuang Hu, Philipp Zabel, Matthias Brugger, tzungbi,
	David Airlie, Daniel Vetter, DRI Development,
	moderated list:ARM/Mediatek SoC support, Linux ARM, linux-kernel,
	Hsin-Yi Wang, Fei Shao, Nancy Lin, singo.chang

Hi, Jason:

jason-jh.lin <jason-jh.lin@mediatek.com> 於 2021年12月2日 週四 下午2:41寫道：
>
> mtk_drm_crtc_atomic_disable will send an async cmd to cmdq driver,
> so it may not finish when cmdq_suspend is called sometimes.
>
> Add wait_for_event after sending async disable plane cmd to make
> sure the lastest cmd is done before cmdq_suspend.

Reviewed-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>

>
> Signed-off-by: jason-jh.lin <jason-jh.lin@mediatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> index 62529a954b62..0b4012335e7a 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> @@ -56,6 +56,7 @@ struct mtk_drm_crtc {
>         struct cmdq_pkt                 cmdq_handle;
>         u32                             cmdq_event;
>         u32                             cmdq_vblank_cnt;
> +       wait_queue_head_t               cb_blocking_queue;
>  #endif
>
>         struct device                   *mmsys_dev;
> @@ -314,6 +315,7 @@ static void ddp_cmdq_cb(struct mbox_client *cl, void *mssg)
>         }
>
>         mtk_crtc->cmdq_vblank_cnt = 0;
> +       wake_up(&mtk_crtc->cb_blocking_queue);
>  }
>  #endif
>
> @@ -700,6 +702,13 @@ static void mtk_drm_crtc_atomic_disable(struct drm_crtc *crtc,
>         mtk_crtc->pending_planes = true;
>
>         mtk_drm_crtc_update_config(mtk_crtc, false);
> +#if IS_REACHABLE(CONFIG_MTK_CMDQ)
> +       /* Wait for planes to be disabled by cmdq */
> +       if (mtk_crtc->cmdq_client.chan)
> +               wait_event_timeout(mtk_crtc->cb_blocking_queue,
> +                                  mtk_crtc->cmdq_vblank_cnt == 0,
> +                                  msecs_to_jiffies(500));
> +#endif
>         /* Wait for planes to be disabled */
>         drm_crtc_wait_one_vblank(crtc);
>
> @@ -980,6 +989,9 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
>                                 mtk_crtc->cmdq_client.chan = NULL;
>                         }
>                 }
> +
> +               /* for sending blocking cmd in crtc disable */
> +               init_waitqueue_head(&mtk_crtc->cb_blocking_queue);
>         }
>  #endif
>         return 0;
> --
> 2.18.0
>

^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: [PATCH v4 1/2] drm/mediatek: add wait_for_event for crtc disable by cmdq
  2021-12-02 23:21   ` [PATCH v4 1/2] drm/mediatek: add wait_for_event for crtc disable by cmdq Chun-Kuang Hu
@ 2022-02-27  3:36     ` Chun-Kuang Hu
  0 siblings, 0 replies; 5+ messages in thread
From: Chun-Kuang Hu @ 2022-02-27  3:36 UTC (permalink / raw)
  To: Chun-Kuang Hu
  Cc: jason-jh.lin, Philipp Zabel, Matthias Brugger, tzungbi,
	David Airlie, Daniel Vetter, DRI Development,
	moderated list:ARM/Mediatek SoC support, Linux ARM, linux-kernel,
	Hsin-Yi Wang, Fei Shao, Nancy Lin, singo.chang

 Hi, Jason:

Chun-Kuang Hu <chunkuang.hu@kernel.org> 於 2021年12月3日 週五 上午7:21寫道：
>
> Hi, Jason:
>
> jason-jh.lin <jason-jh.lin@mediatek.com> 於 2021年12月2日 週四 下午2:41寫道：
> >
> > mtk_drm_crtc_atomic_disable will send an async cmd to cmdq driver,
> > so it may not finish when cmdq_suspend is called sometimes.
> >
> > Add wait_for_event after sending async disable plane cmd to make
> > sure the lastest cmd is done before cmdq_suspend.
>
> Reviewed-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>

Applied to mediatek-drm-next[1], thanks.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/chunkuang.hu/linux.git/log/?h=mediatek-drm-next

Regards,
Chun-Kuang

>
> >
> > Signed-off-by: jason-jh.lin <jason-jh.lin@mediatek.com>
> > ---
> >  drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 12 ++++++++++++
> >  1 file changed, 12 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> > index 62529a954b62..0b4012335e7a 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> > @@ -56,6 +56,7 @@ struct mtk_drm_crtc {
> >         struct cmdq_pkt                 cmdq_handle;
> >         u32                             cmdq_event;
> >         u32                             cmdq_vblank_cnt;
> > +       wait_queue_head_t               cb_blocking_queue;
> >  #endif
> >
> >         struct device                   *mmsys_dev;
> > @@ -314,6 +315,7 @@ static void ddp_cmdq_cb(struct mbox_client *cl, void *mssg)
> >         }
> >
> >         mtk_crtc->cmdq_vblank_cnt = 0;
> > +       wake_up(&mtk_crtc->cb_blocking_queue);
> >  }
> >  #endif
> >
> > @@ -700,6 +702,13 @@ static void mtk_drm_crtc_atomic_disable(struct drm_crtc *crtc,
> >         mtk_crtc->pending_planes = true;
> >
> >         mtk_drm_crtc_update_config(mtk_crtc, false);
> > +#if IS_REACHABLE(CONFIG_MTK_CMDQ)
> > +       /* Wait for planes to be disabled by cmdq */
> > +       if (mtk_crtc->cmdq_client.chan)
> > +               wait_event_timeout(mtk_crtc->cb_blocking_queue,
> > +                                  mtk_crtc->cmdq_vblank_cnt == 0,
> > +                                  msecs_to_jiffies(500));
> > +#endif
> >         /* Wait for planes to be disabled */
> >         drm_crtc_wait_one_vblank(crtc);
> >
> > @@ -980,6 +989,9 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
> >                                 mtk_crtc->cmdq_client.chan = NULL;
> >                         }
> >                 }
> > +
> > +               /* for sending blocking cmd in crtc disable */
> > +               init_waitqueue_head(&mtk_crtc->cb_blocking_queue);
> >         }
> >  #endif
> >         return 0;
> > --
> > 2.18.0
> >

^ permalink raw reply	[flat|nested] 5+ messages in thread

[parent not found: <20211202064039.20797-3-jason-jh.lin@mediatek.com>]

* Re: [PATCH v4 2/2] drm/mediatek: add devlink to cmdq dev
       [not found] ` <20211202064039.20797-3-jason-jh.lin@mediatek.com>
@ 2021-12-02 23:28   ` Chun-Kuang Hu
  2022-02-27  3:33   ` Chun-Kuang Hu
  1 sibling, 0 replies; 5+ messages in thread
From: Chun-Kuang Hu @ 2021-12-02 23:28 UTC (permalink / raw)
  To: jason-jh.lin
  Cc: Chun-Kuang Hu, Philipp Zabel, Matthias Brugger, tzungbi,
	David Airlie, Daniel Vetter, DRI Development,
	moderated list:ARM/Mediatek SoC support, Linux ARM, linux-kernel,
	Hsin-Yi Wang, Fei Shao, Nancy Lin, singo.chang

Hi, Jason:

jason-jh.lin <jason-jh.lin@mediatek.com> 於 2021年12月2日 週四 下午2:41寫道：
>
> Add devlink to cmdq to make sure the order of suspend and resume
> is correct.
>

Reviewed-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>

> Signed-off-by: jason-jh.lin <jason-jh.lin@mediatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 43 ++++++++++++++++++-------
>  1 file changed, 31 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> index 0b4012335e7a..612d1d69c16c 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> @@ -60,6 +60,7 @@ struct mtk_drm_crtc {
>  #endif
>
>         struct device                   *mmsys_dev;
> +       struct device                   *drm_dev;
>         struct mtk_mutex                *mutex;
>         unsigned int                    ddp_comp_nr;
>         struct mtk_ddp_comp             **ddp_comp;
> @@ -159,6 +160,7 @@ static void mtk_drm_crtc_destroy(struct drm_crtc *crtc)
>         mtk_drm_cmdq_pkt_destroy(&mtk_crtc->cmdq_handle);
>
>         if (mtk_crtc->cmdq_client.chan) {
> +               device_link_remove(mtk_crtc->drm_dev, mtk_crtc->cmdq_client.chan->mbox->dev);
>                 mbox_free_channel(mtk_crtc->cmdq_client.chan);
>                 mtk_crtc->cmdq_client.chan = NULL;
>         }
> @@ -902,6 +904,7 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
>                 return -ENOMEM;
>
>         mtk_crtc->mmsys_dev = priv->mmsys_dev;
> +       mtk_crtc->drm_dev = priv->dev;
>         mtk_crtc->ddp_comp_nr = path_len;
>         mtk_crtc->ddp_comp = devm_kmalloc_array(dev, mtk_crtc->ddp_comp_nr,
>                                                 sizeof(*mtk_crtc->ddp_comp),
> @@ -969,6 +972,18 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
>         }
>
>         if (mtk_crtc->cmdq_client.chan) {
> +               struct device_link *link;
> +
> +               /* add devlink to cmdq dev to make sure suspend/resume order is correct */
> +               link = device_link_add(priv->dev, mtk_crtc->cmdq_client.chan->mbox->dev,
> +                                      DL_FLAG_PM_RUNTIME | DL_FLAG_STATELESS);
> +               if (!link) {
> +                       dev_err(priv->dev, "Unable to link dev=%s\n",
> +                               dev_name(mtk_crtc->cmdq_client.chan->mbox->dev));
> +                       ret = -ENODEV;
> +                       goto cmdq_err;
> +               }
> +
>                 ret = of_property_read_u32_index(priv->mutex_node,
>                                                  "mediatek,gce-events",
>                                                  i,
> @@ -976,22 +991,26 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
>                 if (ret) {
>                         dev_dbg(dev, "mtk_crtc %d failed to get mediatek,gce-events property\n",
>                                 drm_crtc_index(&mtk_crtc->base));
> -                       mbox_free_channel(mtk_crtc->cmdq_client.chan);
> -                       mtk_crtc->cmdq_client.chan = NULL;
> -               } else {
> -                       ret = mtk_drm_cmdq_pkt_create(&mtk_crtc->cmdq_client,
> -                                                     &mtk_crtc->cmdq_handle,
> -                                                     PAGE_SIZE);
> -                       if (ret) {
> -                               dev_dbg(dev, "mtk_crtc %d failed to create cmdq packet\n",
> -                                       drm_crtc_index(&mtk_crtc->base));
> -                               mbox_free_channel(mtk_crtc->cmdq_client.chan);
> -                               mtk_crtc->cmdq_client.chan = NULL;
> -                       }
> +                       goto cmdq_err;
> +               }
> +
> +               ret = mtk_drm_cmdq_pkt_create(&mtk_crtc->cmdq_client,
> +                                             &mtk_crtc->cmdq_handle,
> +                                             PAGE_SIZE);
> +               if (ret) {
> +                       dev_dbg(dev, "mtk_crtc %d failed to create cmdq packet\n",
> +                               drm_crtc_index(&mtk_crtc->base));
> +                       goto cmdq_err;
>                 }
>
>                 /* for sending blocking cmd in crtc disable */
>                 init_waitqueue_head(&mtk_crtc->cb_blocking_queue);
> +
> +cmdq_err:
> +               if (ret) {
> +                       mbox_free_channel(mtk_crtc->cmdq_client.chan);
> +                       mtk_crtc->cmdq_client.chan = NULL;
> +               }
>         }
>  #endif
>         return 0;
> --
> 2.18.0
>

^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: [PATCH v4 2/2] drm/mediatek: add devlink to cmdq dev
       [not found] ` <20211202064039.20797-3-jason-jh.lin@mediatek.com>
  2021-12-02 23:28   ` [PATCH v4 2/2] drm/mediatek: add devlink to cmdq dev Chun-Kuang Hu
@ 2022-02-27  3:33   ` Chun-Kuang Hu
  2022-03-01  1:46     ` Jason-JH Lin
  1 sibling, 1 reply; 5+ messages in thread
From: Chun-Kuang Hu @ 2022-02-27  3:33 UTC (permalink / raw)
  To: jason-jh.lin
  Cc: Chun-Kuang Hu, Philipp Zabel, Matthias Brugger, tzungbi,
	David Airlie, Daniel Vetter, DRI Development,
	moderated list:ARM/Mediatek SoC support, Linux ARM, linux-kernel,
	Hsin-Yi Wang, Fei Shao, Nancy Lin, singo.chang

Hi, Jason:

Build error:

../drivers/gpu/drm/mediatek/mtk_drm_crtc.c: In function ‘mtk_drm_crtc_create’:
../drivers/gpu/drm/mediatek/mtk_drm_crtc.c:902:26: error: ‘struct
mtk_drm_private’ has no member named ‘dev’
  mtk_crtc->drm_dev = priv->dev;
                          ^
../drivers/gpu/drm/mediatek/mtk_drm_crtc.c:974:30: error: ‘struct
mtk_drm_private’ has no member named ‘dev’
   link = device_link_add(priv->dev, mtk_crtc->cmdq_client.chan->mbox->dev,
                              ^
In file included from ../include/linux/device.h:15:0,
                 from ../include/linux/dma-mapping.h:7,
                 from ../drivers/gpu/drm/mediatek/mtk_drm_crtc.c:7:
../drivers/gpu/drm/mediatek/mtk_drm_crtc.c:977:16: error: ‘struct
mtk_drm_private’ has no member named ‘dev’
    dev_err(priv->dev, "Unable to link dev=%s\n",
                ^
Regards,
Chun-Kuang.

jason-jh.lin <jason-jh.lin@mediatek.com> 於 2021年12月2日 週四 下午2:41寫道：
>
> Add devlink to cmdq to make sure the order of suspend and resume
> is correct.
>
> Signed-off-by: jason-jh.lin <jason-jh.lin@mediatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 43 ++++++++++++++++++-------
>  1 file changed, 31 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> index 0b4012335e7a..612d1d69c16c 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> @@ -60,6 +60,7 @@ struct mtk_drm_crtc {
>  #endif
>
>         struct device                   *mmsys_dev;
> +       struct device                   *drm_dev;
>         struct mtk_mutex                *mutex;
>         unsigned int                    ddp_comp_nr;
>         struct mtk_ddp_comp             **ddp_comp;
> @@ -159,6 +160,7 @@ static void mtk_drm_crtc_destroy(struct drm_crtc *crtc)
>         mtk_drm_cmdq_pkt_destroy(&mtk_crtc->cmdq_handle);
>
>         if (mtk_crtc->cmdq_client.chan) {
> +               device_link_remove(mtk_crtc->drm_dev, mtk_crtc->cmdq_client.chan->mbox->dev);
>                 mbox_free_channel(mtk_crtc->cmdq_client.chan);
>                 mtk_crtc->cmdq_client.chan = NULL;
>         }
> @@ -902,6 +904,7 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
>                 return -ENOMEM;
>
>         mtk_crtc->mmsys_dev = priv->mmsys_dev;
> +       mtk_crtc->drm_dev = priv->dev;
>         mtk_crtc->ddp_comp_nr = path_len;
>         mtk_crtc->ddp_comp = devm_kmalloc_array(dev, mtk_crtc->ddp_comp_nr,
>                                                 sizeof(*mtk_crtc->ddp_comp),
> @@ -969,6 +972,18 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
>         }
>
>         if (mtk_crtc->cmdq_client.chan) {
> +               struct device_link *link;
> +
> +               /* add devlink to cmdq dev to make sure suspend/resume order is correct */
> +               link = device_link_add(priv->dev, mtk_crtc->cmdq_client.chan->mbox->dev,
> +                                      DL_FLAG_PM_RUNTIME | DL_FLAG_STATELESS);
> +               if (!link) {
> +                       dev_err(priv->dev, "Unable to link dev=%s\n",
> +                               dev_name(mtk_crtc->cmdq_client.chan->mbox->dev));
> +                       ret = -ENODEV;
> +                       goto cmdq_err;
> +               }
> +
>                 ret = of_property_read_u32_index(priv->mutex_node,
>                                                  "mediatek,gce-events",
>                                                  i,
> @@ -976,22 +991,26 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
>                 if (ret) {
>                         dev_dbg(dev, "mtk_crtc %d failed to get mediatek,gce-events property\n",
>                                 drm_crtc_index(&mtk_crtc->base));
> -                       mbox_free_channel(mtk_crtc->cmdq_client.chan);
> -                       mtk_crtc->cmdq_client.chan = NULL;
> -               } else {
> -                       ret = mtk_drm_cmdq_pkt_create(&mtk_crtc->cmdq_client,
> -                                                     &mtk_crtc->cmdq_handle,
> -                                                     PAGE_SIZE);
> -                       if (ret) {
> -                               dev_dbg(dev, "mtk_crtc %d failed to create cmdq packet\n",
> -                                       drm_crtc_index(&mtk_crtc->base));
> -                               mbox_free_channel(mtk_crtc->cmdq_client.chan);
> -                               mtk_crtc->cmdq_client.chan = NULL;
> -                       }
> +                       goto cmdq_err;
> +               }
> +
> +               ret = mtk_drm_cmdq_pkt_create(&mtk_crtc->cmdq_client,
> +                                             &mtk_crtc->cmdq_handle,
> +                                             PAGE_SIZE);
> +               if (ret) {
> +                       dev_dbg(dev, "mtk_crtc %d failed to create cmdq packet\n",
> +                               drm_crtc_index(&mtk_crtc->base));
> +                       goto cmdq_err;
>                 }
>
>                 /* for sending blocking cmd in crtc disable */
>                 init_waitqueue_head(&mtk_crtc->cb_blocking_queue);
> +
> +cmdq_err:
> +               if (ret) {
> +                       mbox_free_channel(mtk_crtc->cmdq_client.chan);
> +                       mtk_crtc->cmdq_client.chan = NULL;
> +               }
>         }
>  #endif
>         return 0;
> --
> 2.18.0
>

^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: [PATCH v4 2/2] drm/mediatek: add devlink to cmdq dev
  2022-02-27  3:33   ` Chun-Kuang Hu
@ 2022-03-01  1:46     ` Jason-JH Lin
  0 siblings, 0 replies; 5+ messages in thread
From: Jason-JH Lin @ 2022-03-01  1:46 UTC (permalink / raw)
  To: Chun-Kuang Hu
  Cc: Philipp Zabel, Matthias Brugger, tzungbi, David Airlie,
	Daniel Vetter, DRI Development,
	moderated list:ARM/Mediatek SoC support, Linux ARM, linux-kernel,
	Hsin-Yi Wang, Fei Shao, Nancy Lin, singo.chang

Hi Chun-Kuang,

Thanks for the reviews.

I forgot to add the comment that the patch should be based on [1].
We can only apply it after applying [1].

So please apply it after that. Thank you very much!

Regards,
Jason-JH.Lin
---
[1] drm/mediatek: modify mediatek-drm for mt8195 multi mmsys support

https://patchwork.kernel.org/project/linux-mediatek/patch/20220222100741.30138-21-nancy.lin@mediatek.com/
---

On Sun, 2022-02-27 at 11:33 +0800, Chun-Kuang Hu wrote:
> Hi, Jason:
> 
> Build error:
> 
> ../drivers/gpu/drm/mediatek/mtk_drm_crtc.c: In function
> ‘mtk_drm_crtc_create’:
> ../drivers/gpu/drm/mediatek/mtk_drm_crtc.c:902:26: error: ‘struct
> mtk_drm_private’ has no member named ‘dev’
>   mtk_crtc->drm_dev = priv->dev;
>                           ^
> ../drivers/gpu/drm/mediatek/mtk_drm_crtc.c:974:30: error: ‘struct
> mtk_drm_private’ has no member named ‘dev’
>    link = device_link_add(priv->dev, mtk_crtc->cmdq_client.chan-
> >mbox->dev,
>                               ^
> In file included from ../include/linux/device.h:15:0,
>                  from ../include/linux/dma-mapping.h:7,
>                  from ../drivers/gpu/drm/mediatek/mtk_drm_crtc.c:7:
> ../drivers/gpu/drm/mediatek/mtk_drm_crtc.c:977:16: error: ‘struct
> mtk_drm_private’ has no member named ‘dev’
>     dev_err(priv->dev, "Unable to link dev=%s\n",
>                 ^
> Regards,
> Chun-Kuang.



^ permalink raw reply	[flat|nested] 5+ messages in thread

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     [not found] ` <20211202064039.20797-2-jason-jh.lin@mediatek.com>
2021-12-02 23:21   ` [PATCH v4 1/2] drm/mediatek: add wait_for_event for crtc disable by cmdq Chun-Kuang Hu
2022-02-27  3:36     ` Chun-Kuang Hu
     [not found] ` <20211202064039.20797-3-jason-jh.lin@mediatek.com>
2021-12-02 23:28   ` [PATCH v4 2/2] drm/mediatek: add devlink to cmdq dev Chun-Kuang Hu
2022-02-27  3:33   ` Chun-Kuang Hu
2022-03-01  1:46     ` Jason-JH Lin

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