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drm/i915/dp: Don't turn CPT DP ports on too early

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The docs say the port has to come on in training pattern 1; at this
point, though, ->DP is in normal mode.  The intent here is to wait
until the port is in fact sending data, but that doesn't happen since
we've broken the sequence the hardware expects, and the vblank wait will
time out and kvetch in the log.

Signed-off-by: Adam Jackson <ajax@redhat.com>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Keith Packard <keithp@keithp.com>
This commit is contained in:
Adam Jackson 2011-07-21 17:48:38 -04:00 committed by Keith Packard
parent 81055854d0
commit e85194641b
1 changed files with 10 additions and 4 deletions
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8
drivers/gpu/drm/i915/intel_dp.c
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@ -1334,10 +1334,16 @@ intel_dp_start_link_train(struct intel_dp *intel_dp)
u32 reg;
uint32_t DP = intel_dp->DP;
/* Enable output, wait for it to become active */
/*
* On CPT we have to enable the port in training pattern 1, which
* will happen below in intel_dp_set_link_train. Otherwise, enable
* the port and wait for it to become active.
*/
if (!HAS_PCH_CPT(dev)) {
I915_WRITE(intel_dp->output_reg, intel_dp->DP);
POSTING_READ(intel_dp->output_reg);
intel_wait_for_vblank(dev, intel_crtc->pipe);
}
/* Write the link configuration data */
intel_dp_aux_native_write(intel_dp, DP_LINK_BW_SET,