drm/radeon: Fix overflow of watermark calcs at > 4k resolutions.
authorMario Kleiner <mario.kleiner.de@gmail.com>
Tue, 13 Jun 2017 05:17:11 +0000 (07:17 +0200)
committerAlex Deucher <alexander.deucher@amd.com>
Wed, 14 Jun 2017 13:25:58 +0000 (09:25 -0400)
commit55f61a040e1b1ea0ba962e53ae341b4c51915bd1
tree16528c7a73bc73fc1fc4aec5046d3c21adec60da
parentbea10413934dcf98cb9b2dfcdc56e1d28f192897
drm/radeon: Fix overflow of watermark calcs at > 4k resolutions.

Commit e6b9a6c84b93
("drm/radeon: Make display watermark calculations more accurate")
made watermark calculations more accurate, but not for > 4k
resolutions on 32-Bit architectures, as it introduced an integer
overflow for those setups and resolutions.

Fix this by proper u64 casting and division.

Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com>
Reported-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Fixes: e6b9a6c84b93 ("drm/radeon: Make display watermark calculations more accurate")
Cc: Ben Hutchings <ben.hutchings@codethink.co.uk>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
drivers/gpu/drm/radeon/cik.c
drivers/gpu/drm/radeon/evergreen.c
drivers/gpu/drm/radeon/si.c