drm/radeon: force dma32 to fix regression rs4xx,rs6xx,rs740

It seems some of those IGP dislike non dma32 page despite what
documentation says. Fix regression since we allowed non dma32
pages. It seems it only affect some revision of those IGP chips
as we don't know which one just force dma32 for all of them.

https://bugzilla.redhat.com/show_bug.cgi?id=785375

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/radeon/radeon_device.c b/drivers/gpu/drm/radeon/radeon_device.c
index d2e243867ac6f3c9fe4d6c28e25fa421cac6c48b..33da8bff8942f83ab502756867fb865e1cb310b7 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_device.c
+++ b/drivers/gpu/drm/radeon/radeon_device.c
@@ -1051,7 +1051,7 @@ int radeon_device_init(struct radeon_device *rdev,
        if (rdev->flags & RADEON_IS_AGP)
                rdev->need_dma32 = true;
        if ((rdev->flags & RADEON_IS_PCI) &&
-           (rdev->family < CHIP_RS400))
+           (rdev->family <= CHIP_RS740))
                rdev->need_dma32 = true;
 
        dma_bits = rdev->need_dma32 ? 32 : 40;