drm/radeon/kms: display watermark updates (v2)
- Add module option to force the display priority
0 = auto, 1 = normal, 2 = high
- Default to high on r3xx/r4xx/rv515 chips
Fixes flickering problems during heavy acceleration
due to underflow to the display controllers
- Fill in minimal support for RS600
v2 - update display priority when bandwidth is updated
so the user can change the parameter at runtime and it
will take affect on the next modeset.
Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c
index eca714c..b8d6728 100644
--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -971,6 +971,23 @@
return 0;
}
+void radeon_update_display_priority(struct radeon_device *rdev)
+{
+ /* adjustment options for the display watermarks */
+ if ((radeon_disp_priority == 0) || (radeon_disp_priority > 2)) {
+ /* set display priority to high for r3xx, rv515 chips
+ * this avoids flickering due to underflow to the
+ * display controllers during heavy acceleration.
+ */
+ if (ASIC_IS_R300(rdev) || (rdev->family == CHIP_RV515))
+ rdev->disp_priority = 2;
+ else
+ rdev->disp_priority = 0;
+ } else
+ rdev->disp_priority = radeon_disp_priority;
+
+}
+
int radeon_modeset_init(struct radeon_device *rdev)
{
int i;