drm/radeon/dce6: fix display powergating

Only enable it when we disable the display rather than
at DPMS time since enabling it requires a full modeset
to restore the display state.  Fixes blank screens in
certain cases.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

1 files changed, 2 insertions, 4 deletions

diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c b/drivers/gpu/drm/radeon/atombios_crtc.c
index 9175615bbd8a..21a892c6ab9c 100644
--- a/drivers/gpu/drm/radeon/atombios_crtc.c
+++ b/drivers/gpu/drm/radeon/atombios_crtc.c
@@ -252,8 +252,6 @@ void atombios_crtc_dpms(struct drm_crtc *crtc, int mode)
                 radeon_crtc->enabled = true;
                 /* adjust pm to dpms changes BEFORE enabling crtcs */
                 radeon_pm_compute_clocks(rdev);
-                if (ASIC_IS_DCE6(rdev) && !radeon_crtc->in_mode_set)
-                        atombios_powergate_crtc(crtc, ATOM_DISABLE);
                 atombios_enable_crtc(crtc, ATOM_ENABLE);
                 if (ASIC_IS_DCE3(rdev) && !ASIC_IS_DCE6(rdev))
                         atombios_enable_crtc_memreq(crtc, ATOM_ENABLE);
@@ -271,8 +269,6 @@ void atombios_crtc_dpms(struct drm_crtc *crtc, int mode)
                         atombios_enable_crtc_memreq(crtc, ATOM_DISABLE);
                 atombios_enable_crtc(crtc, ATOM_DISABLE);
                 radeon_crtc->enabled = false;
-                if (ASIC_IS_DCE6(rdev) && !radeon_crtc->in_mode_set)
-                        atombios_powergate_crtc(crtc, ATOM_ENABLE);
                 /* adjust pm to dpms changes AFTER disabling crtcs */
                 radeon_pm_compute_clocks(rdev);
                 break;
@@ -1844,6 +1840,8 @@ static void atombios_crtc_disable(struct drm_crtc *crtc)
         int i;
 
         atombios_crtc_dpms(crtc, DRM_MODE_DPMS_OFF);
+        if (ASIC_IS_DCE6(rdev))
+                atombios_powergate_crtc(crtc, ATOM_ENABLE);
 
         for (i = 0; i < rdev->num_crtc; i++) {
                 if (rdev->mode_info.crtcs[i] &&