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>

1 files changed, 24 insertions, 1 deletions

diff --git a/drivers/gpu/drm/radeon/rs600.c b/drivers/gpu/drm/radeon/rs600.c
index 30c4b46f3521..abf824c2123d 100644
--- a/drivers/gpu/drm/radeon/rs600.c
+++ b/drivers/gpu/drm/radeon/rs600.c
@@ -483,7 +483,30 @@ void rs600_mc_init(struct radeon_device *rdev)
 
 void rs600_bandwidth_update(struct radeon_device *rdev)
 {
-        /* FIXME: implement, should this be like rs690 ? */
+        struct drm_display_mode *mode0 = NULL;
+        struct drm_display_mode *mode1 = NULL;
+        u32 d1mode_priority_a_cnt, d2mode_priority_a_cnt;
+        /* FIXME: implement full support */
+
+        radeon_update_display_priority(rdev);
+
+        if (rdev->mode_info.crtcs[0]->base.enabled)
+                mode0 = &rdev->mode_info.crtcs[0]->base.mode;
+        if (rdev->mode_info.crtcs[1]->base.enabled)
+                mode1 = &rdev->mode_info.crtcs[1]->base.mode;
+
+        rs690_line_buffer_adjust(rdev, mode0, mode1);
+
+        if (rdev->disp_priority == 2) {
+                d1mode_priority_a_cnt = RREG32(R_006548_D1MODE_PRIORITY_A_CNT);
+                d2mode_priority_a_cnt = RREG32(R_006D48_D2MODE_PRIORITY_A_CNT);
+                d1mode_priority_a_cnt |= S_006548_D1MODE_PRIORITY_A_ALWAYS_ON(1);
+                d2mode_priority_a_cnt |= S_006D48_D2MODE_PRIORITY_A_ALWAYS_ON(1);
+                WREG32(R_006548_D1MODE_PRIORITY_A_CNT, d1mode_priority_a_cnt);
+                WREG32(R_00654C_D1MODE_PRIORITY_B_CNT, d1mode_priority_a_cnt);
+                WREG32(R_006D48_D2MODE_PRIORITY_A_CNT, d2mode_priority_a_cnt);
+                WREG32(R_006D4C_D2MODE_PRIORITY_B_CNT, d2mode_priority_a_cnt);
+        }
 }
 
 uint32_t rs600_mc_rreg(struct radeon_device *rdev, uint32_t reg)