[PATCH 2/2] drm/amd: print error on convert_tiling_flags_to_modifier failure

[Simon Ser]

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 at emersion.fr>
Cc: Alex Deucher <alexander.deucher at amd.com>
Cc: Harry Wentland <hwentlan at amd.com>
Cc: Nicholas Kazlauskas <nicholas.kazlauskas at amd.com>
Cc: Bas Nieuwenhuizen <bas at basnieuwenhuizen.nl>
Cc: Michel Dänzer <michel at daenzer.net>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_display.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
index 73b85da2ccbf..e90be2e8eb2a 100644
--- 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) {
-- 
2.29.2