drm/i915: Ensure panel is on during DPMS off

If the panel is already off, we'll need to turn VDD on to execute the
(useless) DPMS off code. Yes, it would be better to just not do any of
this, but correctness, and *then* performance.

Signed-off-by: Keith Packard <keithp@keithp.com>

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 7e59f06..68bcd77 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1073,6 +1073,7 @@ intel_dp_dpms(struct drm_encoder *encoder, int mode)
        uint32_t dp_reg = I915_READ(intel_dp->output_reg);
 
        if (mode != DRM_MODE_DPMS_ON) {
+               ironlake_edp_panel_vdd_on(intel_dp);
                if (is_edp(intel_dp))
                        ironlake_edp_backlight_off(dev);
                intel_dp_sink_dpms(intel_dp, mode);
@@ -1080,6 +1081,7 @@ intel_dp_dpms(struct drm_encoder *encoder, int mode)
                ironlake_edp_panel_off(dev);
                if (is_edp(intel_dp) && !is_pch_edp(intel_dp))
                        ironlake_edp_pll_off(encoder);
+               ironlake_edp_panel_vdd_off(intel_dp);
        } else {
                ironlake_edp_panel_vdd_on(intel_dp);
                intel_dp_sink_dpms(intel_dp, mode);