drm/radeon/dpm: Disable sclk switching on Oland when two 4K 60Hz monitors are connected

Screen flickers rapidly when two 4K 60Hz monitors are in use. This issue
doesn't happen when one monitor is 4K 60Hz (pixelclock 594MHz) and
another one is 4K 30Hz (pixelclock 297MHz).

The issue is gone after setting "power_dpm_force_performance_level" to
"high". Following the indication, we found that the issue occurs when
sclk is too low.

So resolve the issue by disabling sclk switching when there are two
monitors requires high pixelclock (> 297MHz).

v2:
 - Only apply the fix to Oland.
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 42281fc..56ed563 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -1549,6 +1549,7 @@ struct radeon_dpm {
        void                    *priv;
        u32                     new_active_crtcs;
        int                     new_active_crtc_count;
+       int                     high_pixelclock_count;
        u32                     current_active_crtcs;
        int                     current_active_crtc_count;
        bool single_display;

diff --git a/drivers/gpu/drm/radeon/radeon_pm.c b/drivers/gpu/drm/radeon/radeon_pm.c
index 0c1950f..3861c0b 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_pm.c
+++ b/drivers/gpu/drm/radeon/radeon_pm.c
@@ -1767,6 +1767,7 @@ static void radeon_pm_compute_clocks_dpm(struct radeon_device *rdev)
        struct drm_device *ddev = rdev->ddev;
        struct drm_crtc *crtc;
        struct radeon_crtc *radeon_crtc;
+       struct radeon_connector *radeon_connector;
 
        if (!rdev->pm.dpm_enabled)
                return;
@@ -1776,6 +1777,7 @@ static void radeon_pm_compute_clocks_dpm(struct radeon_device *rdev)
        /* update active crtc counts */
        rdev->pm.dpm.new_active_crtcs = 0;
        rdev->pm.dpm.new_active_crtc_count = 0;
+       rdev->pm.dpm.high_pixelclock_count = 0;
        if (rdev->num_crtc && rdev->mode_info.mode_config_initialized) {
                list_for_each_entry(crtc,
                                    &ddev->mode_config.crtc_list, head) {
@@ -1783,6 +1785,12 @@ static void radeon_pm_compute_clocks_dpm(struct radeon_device *rdev)
                        if (crtc->enabled) {
                                rdev->pm.dpm.new_active_crtcs |= (1 << radeon_crtc->crtc_id);
                                rdev->pm.dpm.new_active_crtc_count++;
+                               if (!radeon_crtc->connector)
+                                       continue;
+
+                               radeon_connector = to_radeon_connector(radeon_crtc->connector);
+                               if (radeon_connector->pixelclock_for_modeset > 297000)
+                                       rdev->pm.dpm.high_pixelclock_count++;
                        }
                }
        }

diff --git a/drivers/gpu/drm/radeon/si_dpm.c b/drivers/gpu/drm/radeon/si_dpm.c
index 2c54c0d..3add39c 100644 (file)
--- a/drivers/gpu/drm/radeon/si_dpm.c
+++ b/drivers/gpu/drm/radeon/si_dpm.c
@@ -2979,6 +2979,9 @@ static void si_apply_state_adjust_rules(struct radeon_device *rdev,
                    (rdev->pdev->device == 0x6605)) {
                        max_sclk = 75000;
                }
+
+               if (rdev->pm.dpm.high_pixelclock_count > 1)
+                       disable_sclk_switching = true;
        }
 
        if (rps->vce_active) {