drm/radeon/dpm: implement vblank_too_short callback for evergreen
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@amd.com>
diff --git a/drivers/gpu/drm/radeon/cypress_dpm.c b/drivers/gpu/drm/radeon/cypress_dpm.c
index 9ef8408..9bcdd17 100644
--- a/drivers/gpu/drm/radeon/cypress_dpm.c
+++ b/drivers/gpu/drm/radeon/cypress_dpm.c
@@ -2174,3 +2174,16 @@
kfree(rdev->pm.dpm.ps);
kfree(rdev->pm.dpm.priv);
}
+
+bool cypress_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 : 300;
+
+ if (vblank_time < switch_limit)
+ return true;
+ else
+ return false;
+
+}
diff --git a/drivers/gpu/drm/radeon/radeon_asic.c b/drivers/gpu/drm/radeon/radeon_asic.c
index c3b2f96..e730263 100644
--- a/drivers/gpu/drm/radeon/radeon_asic.c
+++ b/drivers/gpu/drm/radeon/radeon_asic.c
@@ -1519,6 +1519,7 @@
.print_power_state = &rv770_dpm_print_power_state,
.debugfs_print_current_performance_level = &rv770_dpm_debugfs_print_current_performance_level,
.force_performance_level = &rv770_dpm_force_performance_level,
+ .vblank_too_short = &cypress_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 ca219e9..0ef8b49 100644
--- a/drivers/gpu/drm/radeon/radeon_asic.h
+++ b/drivers/gpu/drm/radeon/radeon_asic.h
@@ -545,6 +545,7 @@
int cypress_dpm_set_power_state(struct radeon_device *rdev);
void cypress_dpm_display_configuration_changed(struct radeon_device *rdev);
void cypress_dpm_fini(struct radeon_device *rdev);
+bool cypress_dpm_vblank_too_short(struct radeon_device *rdev);
int btc_dpm_init(struct radeon_device *rdev);
void btc_dpm_setup_asic(struct radeon_device *rdev);
int btc_dpm_enable(struct radeon_device *rdev);