linux-kernel - [PATCH 5.11 04/41] amd/display: allow non-linear multi-planar formats

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Date:   Mon, 26 Apr 2021 09:29:51 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Simon Ser <contact@...rsion.fr>,
        Alex Deucher <alexander.deucher@....com>,
        Harry Wentland <hwentlan@....com>,
        Nicholas Kazlauskas <nicholas.kazlauskas@....com>,
        Bas Nieuwenhuizen <bas@...nieuwenhuizen.nl>
Subject: [PATCH 5.11 04/41] amd/display: allow non-linear multi-planar formats

From: Simon Ser <contact@...rsion.fr>

commit 9ebb6bc0125dfb1e65a53eea4aeecc63d4d6ec2d upstream.

Accept non-linear buffers which use a multi-planar format, as long
as they don't use DCC.

Tested on GFX9 with NV12.

Signed-off-by: Simon Ser <contact@...rsion.fr>
Cc: Alex Deucher <alexander.deucher@....com>
Cc: Harry Wentland <hwentlan@....com>
Cc: Nicholas Kazlauskas <nicholas.kazlauskas@....com>
Cc: Bas Nieuwenhuizen <bas@...nieuwenhuizen.nl>
Reviewed-by: Bas Nieuwenhuizen <bas@...nieuwenhuizen.nl>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Cc: stable@...r.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c |   11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -3963,13 +3963,6 @@ static bool dm_plane_format_mod_supporte
 		return true;
 
 	/*
-	 * The arbitrary tiling support for multiplane formats has not been hooked
-	 * up.
-	 */
-	if (info->num_planes > 1)
-		return false;
-
-	/*
 	 * For D swizzle the canonical modifier depends on the bpp, so check
 	 * it here.
 	 */
@@ -3987,6 +3980,10 @@ static bool dm_plane_format_mod_supporte
 		/* Per radeonsi comments 16/64 bpp are more complicated. */
 		if (info->cpp[0] != 4)
 			return false;
+		/* We support multi-planar formats, but not when combined with
+		 * additional DCC metadata planes. */
+		if (info->num_planes > 1)
+			return false;
 	}
 
 	return true;