drm/i915: reject invalid formats for FBC
This commit is essentially a rewrite of "drm/i915: Check pixel format
for fbc" from Ville Syrjälä. The idea is the same, but the code is
different due to all the changes that happened since his original
patch. So any bugs are due to my bad rewrite.
v2:
- Drop the alpha formats (Ville).
v3:
- Drop the stale comment (Ville).
Testcases: igt/kms_frontbuffer_tracking/*fbc*-${format_name}-draw-*
Credits-to: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index e5242c0..3044cbe 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -950,6 +950,7 @@
FBC_IN_DBG_MASTER, /* kernel debugger is active */
FBC_BAD_STRIDE, /* stride is not supported */
FBC_PIXEL_RATE, /* pixel rate is too big */
+ FBC_PIXEL_FORMAT /* pixel format is invalid */
} no_fbc_reason;
bool (*fbc_enabled)(struct drm_i915_private *dev_priv);
diff --git a/drivers/gpu/drm/i915/intel_fbc.c b/drivers/gpu/drm/i915/intel_fbc.c
index 56cf110..9d2f56e 100644
--- a/drivers/gpu/drm/i915/intel_fbc.c
+++ b/drivers/gpu/drm/i915/intel_fbc.c
@@ -484,6 +484,8 @@
return "framebuffer stride not supported";
case FBC_PIXEL_RATE:
return "pixel rate is too big";
+ case FBC_PIXEL_FORMAT:
+ return "pixel format is invalid";
default:
MISSING_CASE(reason);
return "unknown reason";
@@ -709,6 +711,29 @@
return true;
}
+static bool pixel_format_is_valid(struct drm_framebuffer *fb)
+{
+ struct drm_device *dev = fb->dev;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+
+ switch (fb->pixel_format) {
+ case DRM_FORMAT_XRGB8888:
+ case DRM_FORMAT_XBGR8888:
+ return true;
+ case DRM_FORMAT_XRGB1555:
+ case DRM_FORMAT_RGB565:
+ /* 16bpp not supported on gen2 */
+ if (IS_GEN2(dev))
+ return false;
+ /* WaFbcOnly1to1Ratio:ctg */
+ if (IS_G4X(dev_priv))
+ return false;
+ return true;
+ default:
+ return false;
+ }
+}
+
/**
* __intel_fbc_update - enable/disable FBC as needed, unlocked
* @dev_priv: i915 device instance
@@ -824,6 +849,11 @@
goto out_disable;
}
+ if (!pixel_format_is_valid(fb)) {
+ set_no_fbc_reason(dev_priv, FBC_PIXEL_FORMAT);
+ goto out_disable;
+ }
+
/* If the kernel debugger is active, always disable compression */
if (in_dbg_master()) {
set_no_fbc_reason(dev_priv, FBC_IN_DBG_MASTER);