From 76ad73e549ff39cbb235dae3a14902bb6ca12d53 Mon Sep 17 00:00:00 2001 From: Alex Deucher Date: Mon, 8 Jul 2013 12:09:41 -0400 Subject: drm/radeon/dpm: implement vblank_too_short callback for cayman 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 --- drivers/gpu/drm/radeon/ni_dpm.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) (limited to 'drivers/gpu/drm/radeon/ni_dpm.c') diff --git a/drivers/gpu/drm/radeon/ni_dpm.c b/drivers/gpu/drm/radeon/ni_dpm.c index bd96eaa3f015..559cf24d51af 100644 --- a/drivers/gpu/drm/radeon/ni_dpm.c +++ b/drivers/gpu/drm/radeon/ni_dpm.c @@ -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; -- cgit v1.2.3