On Thu, Oct 25, 2018 at 06:32:56PM -0700, Dhinakaran Pandiyan wrote:
> Currently there is some duplication of pixel format and modifier
> validation code between the fb creation and plane check paths. We can
> unify them by checking if any plane supports a pixel format and modifier
> combination during framebuffer creation.
> 
> Suggested-by: Ville Syrjälä <[email protected]>
> Cc: Ville Syrjälä <[email protected]>
> Signed-off-by: Dhinakaran Pandiyan <[email protected]>
> ---
>  drivers/gpu/drm/i915/intel_display.c | 116 
> ++++++-----------------------------
>  1 file changed, 19 insertions(+), 97 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c 
> b/drivers/gpu/drm/i915/intel_display.c
> index fe045abb6472..1b5d936a93d0 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -14362,6 +14362,19 @@ u32 intel_fb_pitch_limit(struct drm_i915_private 
> *dev_priv,
>                                DRM_MODE_ROTATE_0);
>  }
>  
> +static bool any_plane_supports_format(struct drm_i915_private *dev_priv,
> +                                          uint64_t fb_modifier,
> +                                          uint32_t pixel_format)

"format first, modifier second" is the typical covention.

But I think we could stuff this entire thing into the core, in case
someone else wants to reuse it. I think I even posted the patches
that do it like that.
Ah yes: https://patchwork.freedesktop.org/series/39700/

> +{
> +     struct drm_plane *plane;
> +
> +     drm_for_each_plane(plane, &dev_priv->drm)
> +             if (!drm_plane_check_pixel_format(plane, pixel_format,
> +                                               fb_modifier))
> +                     return true;
> +     return false;
> +}
> +
>  static int intel_framebuffer_init(struct intel_framebuffer *intel_fb,
>                                 struct drm_i915_gem_object *obj,
>                                 struct drm_mode_fb_cmd2 *mode_cmd)
> @@ -14399,40 +14412,12 @@ static int intel_framebuffer_init(struct 
> intel_framebuffer *intel_fb,
>               }
>       }
>  
> -     /* Passed in modifier sanity checking. */
> -     switch (mode_cmd->modifier[0]) {
> -     case I915_FORMAT_MOD_Y_TILED_CCS:
> -     case I915_FORMAT_MOD_Yf_TILED_CCS:
> -             switch (mode_cmd->pixel_format) {
> -             case DRM_FORMAT_XBGR8888:
> -             case DRM_FORMAT_ABGR8888:
> -             case DRM_FORMAT_XRGB8888:
> -             case DRM_FORMAT_ARGB8888:
> -                     break;
> -             default:
> -                     DRM_DEBUG_KMS("RC supported only with RGB8888 
> formats\n");
> -                     goto err;
> -             }
> -             /* fall through */
> -     case I915_FORMAT_MOD_Yf_TILED:
> -             if (mode_cmd->pixel_format == DRM_FORMAT_C8) {
> -                     DRM_DEBUG_KMS("Indexed format does not support Yf 
> tiling\n");
> -                     goto err;
> -             }
> -             /* fall through */
> -     case I915_FORMAT_MOD_Y_TILED:
> -             if (INTEL_GEN(dev_priv) < 9) {
> -                     DRM_DEBUG_KMS("Unsupported tiling 0x%llx!\n",
> -                                   mode_cmd->modifier[0]);
> -                     goto err;
> -             }
> -             break;
> -     case DRM_FORMAT_MOD_LINEAR:
> -     case I915_FORMAT_MOD_X_TILED:
> -             break;
> -     default:
> -             DRM_DEBUG_KMS("Unsupported fb modifier 0x%llx!\n",
> -                           mode_cmd->modifier[0]);
> +     if (!any_plane_supports_format(dev_priv, mode_cmd->modifier[0],
> +                                    mode_cmd->pixel_format)) {
> +             DRM_DEBUG_KMS("Unsupported pixel format %s or modifier 
> 0x%llx\n",
> +                            drm_get_format_name(mode_cmd->pixel_format,
> +                                                &format_name),
> +                            mode_cmd->modifier[0]);
>               goto err;
>       }
>  
> @@ -14466,69 +14451,6 @@ static int intel_framebuffer_init(struct 
> intel_framebuffer *intel_fb,
>               goto err;
>       }
>  
> -     /* Reject formats not supported by any plane early. */
> -     switch (mode_cmd->pixel_format) {
> -     case DRM_FORMAT_C8:
> -     case DRM_FORMAT_RGB565:
> -     case DRM_FORMAT_XRGB8888:
> -     case DRM_FORMAT_ARGB8888:
> -             break;
> -     case DRM_FORMAT_XRGB1555:
> -             if (INTEL_GEN(dev_priv) > 3) {
> -                     DRM_DEBUG_KMS("unsupported pixel format: %s\n",
> -                                   
> drm_get_format_name(mode_cmd->pixel_format, &format_name));
> -                     goto err;
> -             }
> -             break;
> -     case DRM_FORMAT_ABGR8888:
> -             if (!IS_VALLEYVIEW(dev_priv) && !IS_CHERRYVIEW(dev_priv) &&
> -                 INTEL_GEN(dev_priv) < 9) {
> -                     DRM_DEBUG_KMS("unsupported pixel format: %s\n",
> -                                   
> drm_get_format_name(mode_cmd->pixel_format, &format_name));
> -                     goto err;
> -             }
> -             break;
> -     case DRM_FORMAT_XBGR8888:
> -     case DRM_FORMAT_XRGB2101010:
> -     case DRM_FORMAT_XBGR2101010:
> -             if (INTEL_GEN(dev_priv) < 4) {
> -                     DRM_DEBUG_KMS("unsupported pixel format: %s\n",
> -                                   
> drm_get_format_name(mode_cmd->pixel_format, &format_name));
> -                     goto err;
> -             }
> -             break;
> -     case DRM_FORMAT_ABGR2101010:
> -             if (!IS_VALLEYVIEW(dev_priv) && !IS_CHERRYVIEW(dev_priv)) {
> -                     DRM_DEBUG_KMS("unsupported pixel format: %s\n",
> -                                   
> drm_get_format_name(mode_cmd->pixel_format, &format_name));
> -                     goto err;
> -             }
> -             break;
> -     case DRM_FORMAT_YUYV:
> -     case DRM_FORMAT_UYVY:
> -     case DRM_FORMAT_YVYU:
> -     case DRM_FORMAT_VYUY:
> -             if (INTEL_GEN(dev_priv) < 5 && !IS_G4X(dev_priv)) {
> -                     DRM_DEBUG_KMS("unsupported pixel format: %s\n",
> -                                   
> drm_get_format_name(mode_cmd->pixel_format, &format_name));
> -                     goto err;
> -             }
> -             break;
> -     case DRM_FORMAT_NV12:
> -             if (INTEL_GEN(dev_priv) < 9 || IS_SKYLAKE(dev_priv) ||
> -                 IS_BROXTON(dev_priv)) {
> -                     DRM_DEBUG_KMS("unsupported pixel format: %s\n",
> -                                   
> drm_get_format_name(mode_cmd->pixel_format,
> -                                                       &format_name));
> -                     goto err;
> -             }
> -             break;
> -     default:
> -             DRM_DEBUG_KMS("unsupported pixel format: %s\n",
> -                           drm_get_format_name(mode_cmd->pixel_format, 
> &format_name));
> -             goto err;
> -     }
> -
>       /* FIXME need to adjust LINOFF/TILEOFF accordingly. */
>       if (mode_cmd->offsets[0] != 0)
>               goto err;
> -- 
> 2.14.1

-- 
Ville Syrjälä
Intel
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