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    • Bas Nieuwenhuizen's avatar
      Revert "drm/amd/display: ignore modifiers when checking for format support" · 366e817e
      Bas Nieuwenhuizen authored
      This reverts commit 5089c4a8.
      
      This breaks validation and enumeration of display capable modifiers.
      
      The early return true means the rest of the validation code never gets
      executed, and we need that to enumerate the right modifiers to userspace
      for the format.
      
      The modifiers that are in the initial list generated for a plane are the
      superset for all formats and we need the proper checks in this function
      to filter some of them out for formats with which they're invalid to be
      used.
      
      Furthermore, the safety contract here is that we validate the incoming
      modifiers to ensure the kernel can handle them and the display hardware
      can handle them. This includes e.g. rejecting multi-plane images with DCC.
      
      Note that the legacy swizzle mechanism allows encoding more swizzles, and
      at fb creation time we convert them to modifiers and reject those with
      no corresponding modifiers. If we are seeing rejections I'm happy to
      help define modifiers that correspond to those, or if absolutely needed
      implement a fallback path to allow for less strict validation of the
      legacy path.
      
      However, I'd like to revert this patch, since any of these is going to
      be a significant rework of the patch, and I'd rather not the regression
      gets into a release or forgotten in the meantime.
      Reviewed-by: default avatarAurabindo Pillai <aurabindo.pillai@amd.com>
      Signed-off-by: default avatarBas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
      Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
      366e817e