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Message-ID: <CAAOTY__x_-O2AGuWqZ_HSwORTJXcyb+g4uMFnwpxWr338fPpaA@mail.gmail.com>
Date: Fri, 28 Jun 2024 20:32:24 +0800
From: Chun-Kuang Hu <chunkuang.hu@...nel.org>
To: Michael Walle <mwalle@...nel.org>
Cc: Chun-Kuang Hu <chunkuang.hu@...nel.org>, Philipp Zabel <p.zabel@...gutronix.de>, 
	David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, 
	Matthias Brugger <matthias.bgg@...il.com>, 
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 
	Jitao Shi <jitao.shi@...iatek.com>, Stu Hsieh <stu.hsieh@...iatek.com>, 
	"Jason-JH . Lin" <jason-jh.lin@...iatek.com>, dri-devel@...ts.freedesktop.org, 
	Frank Wunderlich <frank-w@...lic-files.de>, linux-mediatek@...ts.infradead.org, 
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	Nícolas F . R . A . Prado <nfraprado@...labora.com>
Subject: Re: [PATCH RESEND v5] drm/mediatek: dpi/dsi: fix possible_crtcs calculation

Hi, Michael:

Michael Walle <mwalle@...nel.org> 於 2024年6月6日 週四 下午5:22寫道:
>
> mtk_find_possible_crtcs() assumes that the main path will always have
> the CRTC with id 0, the ext id 1 and the third id 2. This is only true
> if the paths are all available. But paths are optional (see also
> comment in mtk_drm_kms_init()), e.g. the main path might not be enabled
> or available at all. Then the CRTC IDs will shift one up, e.g. ext will
> be 0 and the third path will be 1.
>
> To fix that, dynamically calculate the IDs by the presence of the paths.
>
> While at it, make the return code a signed one and return -ENODEV if no
> path is found and handle the error in the callers.
>
> Fixes: 5aa8e7647676 ("drm/mediatek: dpi/dsi: Change the getting possible_crtc way")
> Suggested-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>
> Signed-off-by: Michael Walle <mwalle@...nel.org>
> ---
> You can find v4 at [1]. Unfortunately, it was never applied and in the
> meantime there was a change in mtk_find_possible_crtcs(). So I've
> dropped Nícolas Reviewed and Tested-by tags and Angelos Reviewed-by
> tag.
>
> [1] https://lore.kernel.org/r/20230905084922.3908121-2-mwalle@kernel.org/
> ---
>  drivers/gpu/drm/mediatek/mtk_ddp_comp.c | 105 ++++++++++++++++--------
>  drivers/gpu/drm/mediatek/mtk_ddp_comp.h |   2 +-
>  drivers/gpu/drm/mediatek/mtk_dpi.c      |   5 +-
>  drivers/gpu/drm/mediatek/mtk_dsi.c      |   5 +-
>  4 files changed, 78 insertions(+), 39 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_ddp_comp.c
> index 17b036411292..9a8c1cace8a0 100644
> --- a/drivers/gpu/drm/mediatek/mtk_ddp_comp.c
> +++ b/drivers/gpu/drm/mediatek/mtk_ddp_comp.c
> @@ -514,29 +514,42 @@ static bool mtk_ddp_comp_find(struct device *dev,
>         return false;
>  }
>
> -static unsigned int mtk_ddp_comp_find_in_route(struct device *dev,
> -                                              const struct mtk_drm_route *routes,
> -                                              unsigned int num_routes,
> -                                              struct mtk_ddp_comp *ddp_comp)
> +static int mtk_ddp_comp_find_in_route(struct device *dev,
> +                                     const struct mtk_drm_route *routes,
> +                                     unsigned int num_routes,
> +                                     struct mtk_ddp_comp *ddp_comp)
>  {
> -       int ret;
>         unsigned int i;
>
> -       if (!routes) {
> -               ret = -EINVAL;
> -               goto err;
> -       }
> +       if (!routes)
> +               return -EINVAL;
>
>         for (i = 0; i < num_routes; i++)
>                 if (dev == ddp_comp[routes[i].route_ddp].dev)
>                         return BIT(routes[i].crtc_id);
>
> -       ret = -ENODEV;
> -err:
> +       return -ENODEV;
> +}
>
> -       DRM_INFO("Failed to find comp in ddp table, ret = %d\n", ret);
> +static bool mtk_ddp_path_available(const unsigned int *path,
> +                                  unsigned int path_len,
> +                                  struct device_node **comp_node)
> +{
> +       unsigned int i;
>
> -       return 0;
> +       if (!path || !path_len)
> +               return false;
> +
> +       for (i = 0U; i < path_len; i++) {
> +               /* OVL_ADAPTOR doesn't have a device node */
> +               if (path[i] == DDP_COMPONENT_DRM_OVL_ADAPTOR)
> +                       continue;
> +
> +               if (!comp_node[path[i]])
> +                       return false;
> +       }
> +
> +       return true;
>  }
>
>  int mtk_ddp_comp_get_id(struct device_node *node,
> @@ -554,32 +567,52 @@ int mtk_ddp_comp_get_id(struct device_node *node,
>         return -EINVAL;
>  }
>
> -unsigned int mtk_find_possible_crtcs(struct drm_device *drm, struct device *dev)
> +int mtk_find_possible_crtcs(struct drm_device *drm, struct device *dev)
>  {
>         struct mtk_drm_private *private = drm->dev_private;
> -       unsigned int ret = 0;
> -
> -       if (mtk_ddp_comp_find(dev,
> -                             private->data->main_path,
> -                             private->data->main_len,
> -                             private->ddp_comp))
> -               ret = BIT(0);
> -       else if (mtk_ddp_comp_find(dev,
> -                                  private->data->ext_path,
> -                                  private->data->ext_len,
> -                                  private->ddp_comp))
> -               ret = BIT(1);
> -       else if (mtk_ddp_comp_find(dev,
> -                                  private->data->third_path,
> -                                  private->data->third_len,
> -                                  private->ddp_comp))
> -               ret = BIT(2);
> -       else
> -               ret = mtk_ddp_comp_find_in_route(dev,
> -                                                private->data->conn_routes,
> -                                                private->data->num_conn_routes,
> -                                                private->ddp_comp);
> +       const struct mtk_mmsys_driver_data *data;
> +       struct mtk_drm_private *priv_n;
> +       int i = 0, j;
> +       int ret;
>
> +       for (j = 0; j < private->data->mmsys_dev_num; j++) {
> +               priv_n = private->all_drm_private[j];
> +               data = priv_n->data;
> +
> +               if (mtk_ddp_path_available(data->main_path, data->main_len,
> +                                          priv_n->comp_node)) {
> +                       if (mtk_ddp_comp_find(dev, data->main_path,
> +                                             data->main_len,
> +                                             priv_n->ddp_comp))
> +                               return BIT(i);
> +                       i++;
> +               }
> +
> +               if (mtk_ddp_path_available(data->ext_path, data->ext_len,
> +                                          priv_n->comp_node)) {
> +                       if (mtk_ddp_comp_find(dev, data->ext_path,
> +                                             data->ext_len,
> +                                             priv_n->ddp_comp))
> +                               return BIT(i);
> +                       i++;
> +               }
> +
> +               if (mtk_ddp_path_available(data->third_path, data->third_len,
> +                                          priv_n->comp_node)) {
> +                       if (mtk_ddp_comp_find(dev, data->third_path,
> +                                             data->third_len,
> +                                             priv_n->ddp_comp))
> +                               return BIT(i);
> +                       i++;
> +               }
> +       }
> +
> +       ret = mtk_ddp_comp_find_in_route(dev,
> +                                        private->data->conn_routes,
> +                                        private->data->num_conn_routes,
> +                                        private->ddp_comp);
> +
> +       DRM_INFO("Failed to find comp in ddp table, ret = %d\n", ret);

After checking ret < 0 then print this error message, 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.

>         return ret;
>  }
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_ddp_comp.h b/drivers/gpu/drm/mediatek/mtk_ddp_comp.h
> index 26236691ce4c..e2ea19d5ddcb 100644
> --- a/drivers/gpu/drm/mediatek/mtk_ddp_comp.h
> +++ b/drivers/gpu/drm/mediatek/mtk_ddp_comp.h
> @@ -326,7 +326,7 @@ static inline void mtk_ddp_comp_encoder_index_set(struct mtk_ddp_comp *comp)
>
>  int mtk_ddp_comp_get_id(struct device_node *node,
>                         enum mtk_ddp_comp_type comp_type);
> -unsigned int mtk_find_possible_crtcs(struct drm_device *drm, struct device *dev);
> +int mtk_find_possible_crtcs(struct drm_device *drm, struct device *dev);
>  int mtk_ddp_comp_init(struct device_node *comp_node, struct mtk_ddp_comp *comp,
>                       unsigned int comp_id);
>  enum mtk_ddp_comp_type mtk_ddp_comp_get_type(unsigned int comp_id);
> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
> index 5c86aa0b75b2..b894be9f1f53 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> @@ -814,7 +814,10 @@ static int mtk_dpi_bind(struct device *dev, struct device *master, void *data)
>                 return ret;
>         }
>
> -       dpi->encoder.possible_crtcs = mtk_find_possible_crtcs(drm_dev, dpi->dev);
> +       ret = mtk_find_possible_crtcs(drm_dev, dpi->dev);
> +       if (ret < 0)
> +               goto err_cleanup;
> +       dpi->encoder.possible_crtcs = ret;
>
>         ret = drm_bridge_attach(&dpi->encoder, &dpi->bridge, NULL,
>                                 DRM_BRIDGE_ATTACH_NO_CONNECTOR);
> diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
> index 2b0ac859a653..b450b7223aa2 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> @@ -861,7 +861,10 @@ static int mtk_dsi_encoder_init(struct drm_device *drm, struct mtk_dsi *dsi)
>                 return ret;
>         }
>
> -       dsi->encoder.possible_crtcs = mtk_find_possible_crtcs(drm, dsi->host.dev);
> +       ret = mtk_find_possible_crtcs(drm, dsi->host.dev);
> +       if (ret < 0)
> +               goto err_cleanup_encoder;
> +       dsi->encoder.possible_crtcs = ret;
>
>         ret = drm_bridge_attach(&dsi->encoder, &dsi->bridge, NULL,
>                                 DRM_BRIDGE_ATTACH_NO_CONNECTOR);
> --
> 2.39.2
>

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