On Wed, Mar 10, 2021 at 5:14 PM Mark Yacoub <markyacoub@xxxxxxxxxxxx> wrote:
From: Mark Yacoub <markyacoub@xxxxxxxxxx>
On initializing the framebuffer, call drm_any_plane_has_format to do a
check if the modifier is supported. drm_any_plane_has_format calls
dm_plane_format_mod_supported which is extended to validate that the
modifier is on the list of the plane's supported modifiers.
The bug was caught using igt-gpu-tools test: kms_addfb_basic.addfb25-bad-modifier
Tested on ChromeOS Zork by turning on the display, running an overlay
test, and running a YT video.
Cc: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: Bas Nieuwenhuizen <bas@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: default avatarMark Yacoub <markyacoub@xxxxxxxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_display.c | 13 +++++++++++++
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 9 +++++++++
2 files changed, 22 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
index afa5f8ad0f563..a947b5aa420d2 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
@@ -908,6 +908,19 @@ int amdgpu_display_gem_fb_verify_and_init(
&amdgpu_fb_funcs);
if (ret)
goto err;
+ /* Verify that the modifier is supported. */
+ if (!drm_any_plane_has_format(dev, mode_cmd->pixel_format,
+ mode_cmd->modifier[0])) {
+ struct drm_format_name_buf format_name;
+ drm_dbg_kms(dev,
+ "unsupported pixel format %s / modifier 0x%llx\n",
+ drm_get_format_name(mode_cmd->pixel_format,
+ &format_name),
+ mode_cmd->modifier[0]);
+
+ ret = -EINVAL;
+ goto err;
+ }
Why is this needed?
ret = amdgpu_display_framebuffer_init(dev, rfb, mode_cmd, obj);
if (ret)
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 961abf1cf040c..21314024a83ce 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -3939,6 +3939,7 @@ 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);
+ int i;
enum dm_micro_swizzle microtile = modifier_gfx9_swizzle_mode(modifier) & 3;
@@ -3952,6 +3953,14 @@ static bool dm_plane_format_mod_supported(struct drm_plane *plane,
if (modifier == DRM_FORMAT_MOD_LINEAR)
return true;
+ /* 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;
+
This part seems fine by me.
/*
* The arbitrary tiling support for multiplane formats has not been hooked
* up.
--
2.30.1.766.gb4fecdf3b7-goog
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