drm/i915: Add debug message for FB plane[0].offset!=0 error

Print a debug message if the FB plane[0] offset is not 0 as expected, to
help understainding an add FB IOCTL fail.

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Mika Kahola <mika.kahola@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Mika Kahola <mika.kahola@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191231233756.18753-4-imre.deak@intel.com

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 14e62f5..ab76494 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -16912,8 +16912,11 @@ static int intel_framebuffer_init(struct intel_framebuffer *intel_fb,
        }
 
        /* FIXME need to adjust LINOFF/TILEOFF accordingly. */
-       if (mode_cmd->offsets[0] != 0)
+       if (mode_cmd->offsets[0] != 0) {
+               DRM_DEBUG_KMS("plane 0 offset (0x%08x) must be 0\n",
+                             mode_cmd->offsets[0]);
                goto err;
+       }
 
        drm_helper_mode_fill_fb_struct(&dev_priv->drm, fb, mode_cmd);