[PATCH 4/4] drm/vc4: Validate framebuffer pixel format/modifier

[Ville Syrjala <ville.syrjala@linux.intel.com>]

From: Ville Syrjälä <ville.syrjala@linux.intel.com>

Only create framebuffers with supported format/modifier combinations by
checking that at least one plane supports the requested combination.

Using drm_any_plane_has_format() is somewhat suboptimal for vc4 since
the planes have (mostly) uniform capabilities. But I was lazy and
didn't feel like exporting drm_plane_format_check() and hand rolling
anything better. Also I really just wanted to come up with another
user for drm_any_plane_has_format() ;)

Compile tested only.

Cc: Eric Anholt <eric@anholt.net>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
 drivers/gpu/drm/vc4/vc4_kms.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/gpu/drm/vc4/vc4_kms.c b/drivers/gpu/drm/vc4/vc4_kms.c
index ba60153dddb5..b6f15102dda0 100644
--- a/drivers/gpu/drm/vc4/vc4_kms.c
+++ b/drivers/gpu/drm/vc4/vc4_kms.c
@@ -184,6 +184,17 @@ static struct drm_framebuffer *vc4_fb_create(struct drm_device *dev,
 		mode_cmd = &mode_cmd_local;
 	}
 
+	if (!drm_any_plane_has_format(dev, mode_cmd->pixel_format,
+				      mode_cmd->modifier[0])) {
+		struct drm_format_name_buf format_name;
+
+		DRM_DEBUG_KMS("unsupported pixel format %s / modifier 0x%llx\n",
+			      drm_get_format_name(mode_cmd->pixel_format,
+						  &format_name),
+			      mode_cmd->modifier[0]);
+		return ERR_PTR(-EINVAL);
+	}
+
 	return drm_gem_fb_create(dev, file_priv, mode_cmd);
 }
 
-- 
2.16.1

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