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Revert and fix "drm/i915/dp: remove DPMS mode tracking from DP"

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This reverts commit 885a50147f.

We actually *do* need to track DPMS state so that on hotplug, we don't
retrain the link until DPMS is disabled.

However, that code had avery small bug -- it wouldn't set the
dpms_mode at mode set time, and so link retraining would not actually
occur on monitor hotplug until the monitor had gone through a DPMS
off/DPMS on cycle.

Signed-off-by: Keith Packard <keithp@keithp.com>
Tested-by: Andrew Lutomirski <luto@mit.edu>
This commit is contained in:
Keith Packard 2011-07-25 22:37:51 -07:00
parent f0575e9297
commit d2b996ac69
1 changed files with 8 additions and 0 deletions
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8
drivers/gpu/drm/i915/intel_dp.c
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@ -50,6 +50,7 @@ struct intel_dp {
bool has_audio;
int force_audio;
uint32_t color_range;
int dpms_mode;
uint8_t link_bw;
uint8_t lane_count;
uint8_t dpcd[8];
@ -1011,6 +1012,8 @@ static void intel_dp_commit(struct drm_encoder *encoder)
if (is_edp(intel_dp))
ironlake_edp_backlight_on(dev);
intel_dp->dpms_mode = DRM_MODE_DPMS_ON;
}
static void
@ -1045,6 +1048,7 @@ intel_dp_dpms(struct drm_encoder *encoder, int mode)
if (is_edp(intel_dp))
ironlake_edp_backlight_on(dev);
}
intel_dp->dpms_mode = mode;
}
/*
@ -1591,6 +1595,9 @@ intel_dp_get_dpcd(struct intel_dp *intel_dp)
static void
intel_dp_check_link_status(struct intel_dp *intel_dp)
{
if (intel_dp->dpms_mode != DRM_MODE_DPMS_ON)
return;
if (!intel_dp->base.base.crtc)
return;
@ -1939,6 +1946,7 @@ intel_dp_init(struct drm_device *dev, int output_reg)
return;
intel_dp->output_reg = output_reg;
intel_dp->dpms_mode = -1;
intel_connector = kzalloc(sizeof(struct intel_connector), GFP_KERNEL);
if (!intel_connector) {