drm/radeon: disable the GRPH block when we disable the crtc

Since we aren't using it when the crtc is disabled, turn it off
to save power.  The GRPH block is the part of the display
controller that controls the primary graphics plane (size,
address, etc.).

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c b/drivers/gpu/drm/radeon/atombios_crtc.c
index b9d3b43..bf87f6d 100644 (file)
--- a/drivers/gpu/drm/radeon/atombios_crtc.c
+++ b/drivers/gpu/drm/radeon/atombios_crtc.c
@@ -1910,6 +1910,12 @@ static void atombios_crtc_disable(struct drm_crtc *crtc)
        int i;
 
        atombios_crtc_dpms(crtc, DRM_MODE_DPMS_OFF);
+       /* disable the GRPH */
+       if (ASIC_IS_DCE4(rdev))
+               WREG32(EVERGREEN_GRPH_ENABLE + radeon_crtc->crtc_offset, 0);
+       else if (ASIC_IS_AVIVO(rdev))
+               WREG32(AVIVO_D1GRPH_ENABLE + radeon_crtc->crtc_offset, 0);
+
        if (ASIC_IS_DCE6(rdev))
                atombios_powergate_crtc(crtc, ATOM_ENABLE);