drm/radeon/kms: make sure pci max read request size is valid on evergreen+ (v2)
authorAlex Deucher <alexander.deucher@amd.com>
Thu, 1 Sep 2011 17:46:15 +0000 (17:46 +0000)
committerDave Airlie <airlied@redhat.com>
Fri, 2 Sep 2011 08:40:20 +0000 (09:40 +0100)
commitd054ac16eeb658bccadb06b12c39cee22243b10f
tree22a3382e7ceb3469e6723cf6ce42828e42a35df6
parent9adceaa5b3d2480e2252c4a7f9c4bd7d66b8c4a2
drm/radeon/kms: make sure pci max read request size is valid on evergreen+ (v2)

If the bios or OS sets the pci max read request size to 0 or an
invalid value (6,7), it can result in a hang or slowdown.  Check
and set it to something sane if it's invalid.

Fixes:
https://bugzilla.kernel.org/show_bug.cgi?id=42162

v2: use pci reg defines from include/linux/pci_regs.h

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@kernel.org
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
drivers/gpu/drm/radeon/evergreen.c
drivers/gpu/drm/radeon/ni.c