drm/radeon/dpm: implement vblank_too_short callback for btc

[linux-imx.git] / drivers / gpu / drm / radeon / btc_dpm.c

diff --git a/drivers/gpu/drm/radeon/btc_dpm.c b/drivers/gpu/drm/radeon/btc_dpm.c
index 91567448c55d446659a5a125bf13aa0377eadb59..0bfd55e088201d79e3499b8c98585895f2c736c8 100644 (file)
--- a/drivers/gpu/drm/radeon/btc_dpm.c
+++ b/drivers/gpu/drm/radeon/btc_dpm.c
@@ -2059,6 +2059,19 @@ static void btc_init_stutter_mode(struct radeon_device *rdev)
        }
 }
 
+bool btc_dpm_vblank_too_short(struct radeon_device *rdev)
+{
+       struct rv7xx_power_info *pi = rv770_get_pi(rdev);
+       u32 vblank_time = r600_dpm_get_vblank_time(rdev);
+       u32 switch_limit = pi->mem_gddr5 ? 450 : 100;
+
+       if (vblank_time < switch_limit)
+               return true;
+       else
+               return false;
+
+}
+
 static void btc_apply_state_adjust_rules(struct radeon_device *rdev,
                                         struct radeon_ps *rps)
 {
@@ -2068,7 +2081,8 @@ static void btc_apply_state_adjust_rules(struct radeon_device *rdev,
        u32 mclk, sclk;
        u16 vddc, vddci;
 
-       if (rdev->pm.dpm.new_active_crtc_count > 1)
+       if ((rdev->pm.dpm.new_active_crtc_count > 1) ||
+           btc_dpm_vblank_too_short(rdev))
                disable_mclk_switching = true;
        else
                disable_mclk_switching = false;