drm/armada: disable CRTC clock during DPMS
When the CRTC is in low power mode, it isn't running, and so there's
no point keeping the CRTC clock enabled. Disable the CRTC clock during
DPMS.
We need to re-enable it in the mode_set callback to ensure that the
variant's compute_clock() continues to see its clock in the expected
state (enabled).
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/drivers/gpu/drm/armada/armada_crtc.c b/drivers/gpu/drm/armada/armada_crtc.c
index bbf5ff7..8c43ecc 100644
--- a/drivers/gpu/drm/armada/armada_crtc.c
+++ b/drivers/gpu/drm/armada/armada_crtc.c
@@ -325,7 +325,11 @@
if (dcrtc->dpms != dpms) {
dcrtc->dpms = dpms;
+ if (!IS_ERR(dcrtc->clk) && !dpms_blanked(dpms))
+ WARN_ON(clk_prepare_enable(dcrtc->clk));
armada_drm_crtc_update(dcrtc);
+ if (!IS_ERR(dcrtc->clk) && dpms_blanked(dpms))
+ clk_disable_unprepare(dcrtc->clk);
if (dpms_blanked(dpms))
armada_drm_vblank_off(dcrtc);
else
@@ -563,6 +567,13 @@
writel_relaxed(val, dcrtc->base + LCD_SPU_DUMB_CTRL);
}
+ /*
+ * If we are blanked, we would have disabled the clock. Re-enable
+ * it so that compute_clock() does the right thing.
+ */
+ if (!IS_ERR(dcrtc->clk) && dpms_blanked(dcrtc->dpms))
+ WARN_ON(clk_prepare_enable(dcrtc->clk));
+
/* Now compute the divider for real */
dcrtc->variant->compute_clock(dcrtc, adj, &sclk);