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drm/i915: Ensure panel is on during DPMS off

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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>
This commit is contained in:
Keith Packard 2011-10-05 19:53:09 -07:00
parent bee7eb2da2
commit 245e270877
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/i915/intel_dp.c
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@ -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);