linux-kernel - [PATCH v2] drm/amd/display: Revert logic for plane modifiers

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Date:   Mon, 24 Oct 2022 08:33:59 -0300
From:   Joaquín Ignacio Aramendía 
        <samsagax@...il.com>
To:     bas@...nieuwenhuizen.nl
Cc:     Xinhui.Pan@....com, alexander.deucher@....com,
        amd-gfx@...ts.freedesktop.org, christian.koenig@....com,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        rodrigo.siqueira@....com, samsagax@...il.com, sunpeng.li@....com,
        stable@...r.kernel.org
Subject: [PATCH v2] drm/amd/display: Revert logic for plane modifiers

This file was split in commit 5d945cbcd4b16a29d6470a80dfb19738f9a4319f
("drm/amd/display: Create a file dedicated to planes") and the logic in
dm_plane_format_mod_supported() function got changed by a switch logic.
That change broke drm_plane modifiers setting on series 5000 APUs
(tested on OXP mini AMD 5800U and HP Dev One 5850U PRO)
leading to Gamescope not working as reported on GitHub[1]

To reproduce the issue, enter a TTY and run:

$ gamescope -- vkcube

With said commit applied it will abort. This one restores the old logic,
fixing the issue that affects Gamescope.

[1](https://github.com/Plagman/gamescope/issues/624)

Cc: <stable@...r.kernel.org> # 6.0.x
Signed-off-by: Joaquín Ignacio Aramendía <samsagax@...il.com>
Reviewed-by: Bas Nieuwenhuizen <bas@...nieuwenhuizen.nl>
---
Removed asic_id and excess newlines. Resend with correct Cc line.
---
 .../amd/display/amdgpu_dm/amdgpu_dm_plane.c   | 50 +++----------------
 1 file changed, 7 insertions(+), 43 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
index dfd3be49eac8..e6854f7270a6 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
@@ -1369,7 +1369,7 @@ static bool dm_plane_format_mod_supported(struct drm_plane *plane,
 {
 	struct amdgpu_device *adev = drm_to_adev(plane->dev);
 	const struct drm_format_info *info = drm_format_info(format);
-	struct hw_asic_id asic_id = adev->dm.dc->ctx->asic_id;
+	int i;

 	enum dm_micro_swizzle microtile = modifier_gfx9_swizzle_mode(modifier) & 3;

@@ -1386,49 +1386,13 @@ static bool dm_plane_format_mod_supported(struct drm_plane *plane,
 		return true;
 	}

-	/* check if swizzle mode is supported by this version of DCN */
-	switch (asic_id.chip_family) {
-	case FAMILY_SI:
-	case FAMILY_CI:
-	case FAMILY_KV:
-	case FAMILY_CZ:
-	case FAMILY_VI:
-		/* asics before AI does not have modifier support */
-		return false;
-	case FAMILY_AI:
-	case FAMILY_RV:
-	case FAMILY_NV:
-	case FAMILY_VGH:
-	case FAMILY_YELLOW_CARP:
-	case AMDGPU_FAMILY_GC_10_3_6:
-	case AMDGPU_FAMILY_GC_10_3_7:
-		switch (AMD_FMT_MOD_GET(TILE, modifier)) {
-		case AMD_FMT_MOD_TILE_GFX9_64K_R_X:
-		case AMD_FMT_MOD_TILE_GFX9_64K_D_X:
-		case AMD_FMT_MOD_TILE_GFX9_64K_S_X:
-		case AMD_FMT_MOD_TILE_GFX9_64K_D:
-			return true;
-		default:
-			return false;
-		}
-		break;
-	case AMDGPU_FAMILY_GC_11_0_0:
-	case AMDGPU_FAMILY_GC_11_0_1:
-		switch (AMD_FMT_MOD_GET(TILE, modifier)) {
-		case AMD_FMT_MOD_TILE_GFX11_256K_R_X:
-		case AMD_FMT_MOD_TILE_GFX9_64K_R_X:
-		case AMD_FMT_MOD_TILE_GFX9_64K_D_X:
-		case AMD_FMT_MOD_TILE_GFX9_64K_S_X:
-		case AMD_FMT_MOD_TILE_GFX9_64K_D:
-			return true;
-		default:
-			return false;
-		}
-		break;
-	default:
-		ASSERT(0); /* Unknown asic */
-		break;
+	/* Check that the modifier is on the list of the plane's supported modifiers. */
+	for (i = 0; i < plane->modifier_count; i++) {
+		if (modifier == plane->modifiers[i])
+			break;
 	}
+	if (i == plane->modifier_count)
+		return false;

 	/*
 	 * For D swizzle the canonical modifier depends on the bpp, so check
--
2.38.1