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

diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c b/drivers/gpu/drm/radeon/atombios_crtc.c
index 9175615bbd8a158d8d38a071f0fc87e30c78f688..21a892c6ab9c85929bc781bb116071ae66e8ad23 100644 (file)
--- 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] &&