Check if we can switch the mclk during the vblank time otherwise
we may get artifacts on the screen when the mclk changes.
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
---
drivers/gpu/drm/radeon/ci_dpm.c | 16 +++++++++++++++-
drivers/gpu/drm/radeon/radeon_asic.c | 1 +
drivers/gpu/drm/radeon/radeon_asic.h | 1 +
3 files changed, 17 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/radeon/ci_dpm.c b/drivers/gpu/drm/radeon/ci_dpm.c
index 9eebf1f..6e3d387 100644
--- a/drivers/gpu/drm/radeon/ci_dpm.c
+++ b/drivers/gpu/drm/radeon/ci_dpm.c
@@ -682,6 +682,19 @@ static void ci_dpm_powergate_uvd(struct radeon_device *rdev, bool gate)
ci_update_uvd_dpm(rdev, gate);
}
+bool ci_dpm_vblank_too_short(struct radeon_device *rdev)
+{
+ struct ci_power_info *pi = ci_get_pi(rdev);
+ u32 vblank_time = r600_dpm_get_vblank_time(rdev);
+ u32 switch_limit = pi->mem_gddr5 ? 450 : 300;
+
+ if (vblank_time < switch_limit)
+ return true;
+ else
+ return false;
+
+}
+
static void ci_apply_state_adjust_rules(struct radeon_device *rdev,
struct radeon_ps *rps)
{
@@ -692,7 +705,8 @@ static void ci_apply_state_adjust_rules(struct radeon_device *rdev,
u32 sclk, mclk;
int i;
- if (rdev->pm.dpm.new_active_crtc_count > 1)
+ if ((rdev->pm.dpm.new_active_crtc_count > 1) ||
+ ci_dpm_vblank_too_short(rdev))
disable_mclk_switching = true;
else
disable_mclk_switching = false;
diff --git a/drivers/gpu/drm/radeon/radeon_asic.c b/drivers/gpu/drm/radeon/radeon_asic.c
index 705bc74..2d7bdda 100644
--- a/drivers/gpu/drm/radeon/radeon_asic.c
+++ b/drivers/gpu/drm/radeon/radeon_asic.c
@@ -2469,6 +2469,7 @@ static struct radeon_asic ci_asic = {
.print_power_state = &ci_dpm_print_power_state,
.debugfs_print_current_performance_level = &ci_dpm_debugfs_print_current_performance_level,
.force_performance_level = &ci_dpm_force_performance_level,
+ .vblank_too_short = &ci_dpm_vblank_too_short,
},
.pflip = {
.pre_page_flip = &evergreen_pre_page_flip,
diff --git a/drivers/gpu/drm/radeon/radeon_asic.h b/drivers/gpu/drm/radeon/radeon_asic.h
index a887928..b5f4e43 100644
--- a/drivers/gpu/drm/radeon/radeon_asic.h
+++ b/drivers/gpu/drm/radeon/radeon_asic.h
@@ -767,6 +767,7 @@ void ci_dpm_debugfs_print_current_performance_level(struct radeon_device *rdev,
struct seq_file *m);
int ci_dpm_force_performance_level(struct radeon_device *rdev,
enum radeon_dpm_forced_level level);
+bool ci_dpm_vblank_too_short(struct radeon_device *rdev);
int kv_dpm_init(struct radeon_device *rdev);
int kv_dpm_enable(struct radeon_device *rdev);
--
1.8.3.1
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