drm/radeon/kms: detect sideport memory on IGP chips

This detects if the sideport memory is enabled and
if it is VRAM is evicted on suspend/resume.

This should fix s/r issues on some IGPs.

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c
index 5c6058c6ddde..921926f3d1f3 100644
--- a/drivers/gpu/drm/radeon/r600.c
+++ b/drivers/gpu/drm/radeon/r600.c
@@ -726,6 +726,10 @@ int r600_mc_init(struct radeon_device *rdev)
         a.full = rfixed_const(100);
         rdev->pm.sclk.full = rfixed_const(rdev->clock.default_sclk);
         rdev->pm.sclk.full = rfixed_div(rdev->pm.sclk, a);
+
+        if (rdev->flags & RADEON_IS_IGP)
+                rdev->mc.igp_sideport_enabled = radeon_atombios_sideport_present(rdev);
+
         return 0;
 }