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drm/i915/dp: down the DP link even if the reg indicates it's already down 

Since the PLL may still be on, and the training pattern may not be
correct.  Fixes suspend/resume on my PCH eDP test system.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
[ickle: minor merge conflict and silence the compiler]
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Jesse Barnes 2010-10-08 10:35:55 -07:00 committed by Chris Wilson
parent 701394cc53
commit 736085bcf9
1 changed files with 6 additions and 10 deletions
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8
drivers/gpu/drm/i915/intel_dp.c
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@ -914,8 +914,6 @@ static void intel_dp_prepare(struct drm_encoder *encoder)
{
struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
struct drm_device *dev = encoder->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
uint32_t dp_reg = I915_READ(intel_dp->output_reg);
if (is_edp(intel_dp)) {
ironlake_edp_backlight_off(dev);
@ -925,7 +923,6 @@ static void intel_dp_prepare(struct drm_encoder *encoder)
else
ironlake_edp_pll_off(encoder);
}
if (dp_reg & DP_PORT_EN)
intel_dp_link_down(intel_dp);
}
@ -956,22 +953,21 @@ intel_dp_dpms(struct drm_encoder *encoder, int mode)
if (mode != DRM_MODE_DPMS_ON) {
if (is_edp(intel_dp))
ironlake_edp_backlight_off(dev);
if (dp_reg & DP_PORT_EN)
intel_dp_link_down(intel_dp);
if (is_edp(intel_dp))
ironlake_edp_panel_off(dev);
if (is_edp(intel_dp) && !is_pch_edp(intel_dp))
ironlake_edp_pll_off(encoder);
} else {
if (!(dp_reg & DP_PORT_EN)) {
if (is_edp(intel_dp))
ironlake_edp_panel_on(intel_dp);
if (!(dp_reg & DP_PORT_EN)) {
intel_dp_start_link_train(intel_dp);
intel_dp_complete_link_train(intel_dp);
}
if (is_edp(intel_dp))
ironlake_edp_backlight_on(dev);
}
}
intel_dp->dpms_mode = mode;
}