[PATCH v3 3/5] drm: Add get_possible_crtc API for dpi, dsi

[Chun-Kuang Hu]

Hi, Frank:

Frank Wunderlich <linux at fw-web.de> 於 2020年8月4日 週二 下午7:00寫道：
>
> From: Stu Hsieh <stu.hsieh at mediatek.com>
>
> For current mediatek dsi encoder, its possible crtc is fixed in crtc
> 0, and mediatek dpi encoder's possible crtc is fixed in crtc 1. In
> some SoC the possible crtc is not fixed in this case, so search
> pipeline information to find out the correct possible crtc.
>

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

> Signed-off-by: Stu Hsieh <stu.hsieh at mediatek.com>
> Signed-off-by: Frank Wunderlich <frank-w at public-files.de>
> ---
>  drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 42 +++++++++++++++++++++
>  drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h |  2 +
>  2 files changed, 44 insertions(+)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> index 57c88de9a329..a5f2ff6bea93 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> @@ -13,6 +13,8 @@
>  #include <linux/of_platform.h>
>  #include <linux/platform_device.h>
>  #include <linux/soc/mediatek/mtk-cmdq.h>
> +#include <drm/drm_print.h>
> +
>  #include "mtk_drm_drv.h"
>  #include "mtk_drm_plane.h"
>  #include "mtk_drm_ddp_comp.h"
> @@ -412,6 +414,22 @@ static const struct mtk_ddp_comp_match mtk_ddp_matches[DDP_COMPONENT_ID_MAX] = {
>         [DDP_COMPONENT_WDMA1]   = { MTK_DISP_WDMA,      1, NULL },
>  };
>
> +static bool mtk_drm_find_comp_in_ddp(struct mtk_ddp_comp ddp_comp,
> +                                        const enum mtk_ddp_comp_id *path,
> +                                        unsigned int path_len)
> +{
> +       unsigned int i;
> +
> +       if (path == NULL)
> +               return false;
> +
> +       for (i = 0U; i < path_len; i++)
> +               if (ddp_comp.id == path[i])
> +                       return true;
> +
> +       return false;
> +}
> +
>  int mtk_ddp_comp_get_id(struct device_node *node,
>                         enum mtk_ddp_comp_type comp_type)
>  {
> @@ -427,6 +445,30 @@ int mtk_ddp_comp_get_id(struct device_node *node,
>         return -EINVAL;
>  }
>
> +unsigned int mtk_drm_find_possible_crtc_by_comp(struct drm_device *drm,
> +                                               struct mtk_ddp_comp ddp_comp)
> +{
> +       struct mtk_drm_private *private = drm->dev_private;
> +       unsigned int ret;
> +
> +       if (mtk_drm_find_comp_in_ddp(ddp_comp, private->data->main_path,
> +               private->data->main_len) == true) {
> +               ret = BIT(0);
> +       } else if (mtk_drm_find_comp_in_ddp(ddp_comp,
> +               private->data->ext_path,
> +               private->data->ext_len) == true) {
> +               ret = BIT(1);
> +       } else if (mtk_drm_find_comp_in_ddp(ddp_comp,
> +               private->data->third_path,
> +               private->data->third_len) == true) {
> +               ret = BIT(2);
> +       } else {
> +               DRM_INFO("Failed to find comp in ddp table\n");
> +               ret = 0;
> +       }
> +       return ret;
> +}
> +
>  int mtk_ddp_comp_init(struct device *dev, struct device_node *node,
>                       struct mtk_ddp_comp *comp, enum mtk_ddp_comp_id comp_id,
>                       const struct mtk_ddp_comp_funcs *funcs)
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> index debe36395fe7..1d9e00b69462 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> @@ -202,6 +202,8 @@ static inline void mtk_ddp_ctm_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_drm_find_possible_crtc_by_comp(struct drm_device *drm,
> +                                               struct mtk_ddp_comp ddp_comp);
>  int mtk_ddp_comp_init(struct device *dev, struct device_node *comp_node,
>                       struct mtk_ddp_comp *comp, enum mtk_ddp_comp_id comp_id,
>                       const struct mtk_ddp_comp_funcs *funcs);
> --
> 2.25.1
>
>
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