drm/amd: print error on convert_tiling_flags_to_modifier failure

If this function fails, it means the tiling flags didn't make sense.
This likely indicates a user-space bug. Log the error alongside with the
provided tiling flags to make debugging easier.

Signed-off-by: Simon Ser <contact@emersion.fr>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Harry Wentland <hwentlan@amd.com>
Cc: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Cc: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Cc: Michel Dänzer <michel@daenzer.net>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
index 73b85da..e90be2e 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
@@ -901,8 +901,11 @@ int amdgpu_display_framebuffer_init(struct drm_device *dev,
        if (dev->mode_config.allow_fb_modifiers &&
            !(rfb->base.flags & DRM_MODE_FB_MODIFIERS)) {
                ret = convert_tiling_flags_to_modifier(rfb);
-               if (ret)
+               if (ret) {
+                       drm_dbg_kms(dev, "Failed to convert tiling flags 0x%llX to a modifier",
+                                   rfb->tiling_flags);
                        goto fail;
+               }
        }
 
        for (i = 1; i < rfb->base.format->num_planes; ++i) {