From 2d8686ccd55b9df3396be1feb967bc9026f38b15 Mon Sep 17 00:00:00 2001
From: Sagar Ghuge <sagar.ghuge@intel.com>
Date: Fri, 19 Apr 2024 08:52:28 -0700
Subject: [PATCH] isl: Update isl_swizzle_supports_rendering comment

Bspec 57023: RENDER_SURFACE_STATE:: Shader Channel Select Red

   "Render Target messages do not support swapping of colors with
   alpha. The Red, Green, or Blue Shader Channel Selects do not
   support SCS_ALPHA. The Shader Channel Select Alpha does not support
   SCS_RED, SCS_GREEN, or SCS_BLUE."

Cc: mesa-stable
Signed-off-by: Sagar Ghuge <sagar.ghuge@intel.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/28791>
---
 src/intel/isl/isl.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/intel/isl/isl.c b/src/intel/isl/isl.c
index 6e3f4f85dc5cf..c0b154cd6c5e3 100644
--- a/src/intel/isl/isl.c
+++ b/src/intel/isl/isl.c
@@ -4227,6 +4227,13 @@ isl_swizzle_supports_rendering(const struct intel_device_info *devinfo,
        *
        *    "For Render Target, this field MUST be programmed to
        *    value = SCS_ALPHA."
+       *
+       * Bspec 57023: RENDER_SURFACE_STATE:: Shader Channel Select Red
+       *
+       *    "Render Target messages do not support swapping of colors with
+       *    alpha. The Red, Green, or Blue Shader Channel Selects do not
+       *    support SCS_ALPHA. The Shader Channel Select Alpha does not support
+       *    SCS_RED, SCS_GREEN, or SCS_BLUE."
        */
       return (swizzle.r == ISL_CHANNEL_SELECT_RED ||
               swizzle.r == ISL_CHANNEL_SELECT_GREEN ||