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drm/radeon/dpm: implement vblank_too_short callback for btc

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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>
This commit is contained in:
Alex Deucher 2013-07-08 12:03:55 -04:00
parent d0b54bdc93
commit a84301c65d
3 changed files with 17 additions and 1 deletions
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16
drivers/gpu/drm/radeon/btc_dpm.c
View file

@ -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;

1
drivers/gpu/drm/radeon/radeon_asic.c
View file

@ -1768,6 +1768,7 @@ static struct radeon_asic btc_asic = {
.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 = &btc_dpm_vblank_too_short,
},
.pflip = {
.pre_page_flip = &evergreen_pre_page_flip,

1
drivers/gpu/drm/radeon/radeon_asic.h
View file

@ -556,6 +556,7 @@ void btc_dpm_post_set_power_state(struct radeon_device *rdev);
void btc_dpm_fini(struct radeon_device *rdev);
u32 btc_dpm_get_sclk(struct radeon_device *rdev, bool low);
u32 btc_dpm_get_mclk(struct radeon_device *rdev, bool low);
bool btc_dpm_vblank_too_short(struct radeon_device *rdev);
int sumo_dpm_init(struct radeon_device *rdev);
int sumo_dpm_enable(struct radeon_device *rdev);
void sumo_dpm_disable(struct radeon_device *rdev);