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drm/radeon/dpm: implement vblank_too_short callback for cayman

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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 12:09:41 -04:00
parent a84301c65d
commit 76ad73e549
3 changed files with 17 additions and 1 deletions
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16
drivers/gpu/drm/radeon/ni_dpm.c
View file

@ -765,6 +765,19 @@ static void ni_calculate_leakage_for_v_and_t(struct radeon_device *rdev,
ni_calculate_leakage_for_v_and_t_formula(coeff, v, t, i_leakage, leakage);
}
bool ni_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;
}
static void ni_apply_state_adjust_rules(struct radeon_device *rdev,
struct radeon_ps *rps)
{
@ -775,7 +788,8 @@ static void ni_apply_state_adjust_rules(struct radeon_device *rdev,
u16 vddc, vddci;
int i;
if (rdev->pm.dpm.new_active_crtc_count > 1)
if ((rdev->pm.dpm.new_active_crtc_count > 1) ||
ni_dpm_vblank_too_short(rdev))
disable_mclk_switching = true;
else
disable_mclk_switching = false;

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

@ -1945,6 +1945,7 @@ static struct radeon_asic cayman_asic = {
.print_power_state = &ni_dpm_print_power_state,
.debugfs_print_current_performance_level = &ni_dpm_debugfs_print_current_performance_level,
.force_performance_level = &ni_dpm_force_performance_level,
.vblank_too_short = &ni_dpm_vblank_too_short,
},
.pflip = {
.pre_page_flip = &evergreen_pre_page_flip,

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

@ -624,6 +624,7 @@ void ni_dpm_debugfs_print_current_performance_level(struct radeon_device *rdev,
struct seq_file *m);
int ni_dpm_force_performance_level(struct radeon_device *rdev,
enum radeon_dpm_forced_level level);
bool ni_dpm_vblank_too_short(struct radeon_device *rdev);
int trinity_dpm_init(struct radeon_device *rdev);
int trinity_dpm_enable(struct radeon_device *rdev);
void trinity_dpm_disable(struct radeon_device *rdev);