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drm/i915/dp: Sanity check eDP existence 

Some hardware claims to have both an LVDS panel and an eDP output.
Whilst this may be true in a rare case, more often it is just broken
hardware. If we see an eDP device we know that it must be connected and
so we can confirm its existence with a simple probe.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=34165
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=24822
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2011-02-12 10:33:12 +00:00
parent a7a75c8f70
commit 3d3dc149ed
1 changed files with 8 additions and 5 deletions
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13
drivers/gpu/drm/i915/intel_dp.c
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@ -1856,6 +1856,9 @@ intel_dp_init(struct drm_device *dev, int output_reg)
if (!intel_dp)
return;
intel_dp->output_reg = output_reg;
intel_dp->dpms_mode = -1;
intel_connector = kzalloc(sizeof(struct intel_connector), GFP_KERNEL);
if (!intel_connector) {
kfree(intel_dp);
@ -1895,10 +1898,6 @@ intel_dp_init(struct drm_device *dev, int output_reg)
connector->interlace_allowed = true;
connector->doublescan_allowed = 0;
intel_dp->output_reg = output_reg;
intel_dp->has_audio = false;
intel_dp->dpms_mode = DRM_MODE_DPMS_ON;
drm_encoder_init(dev, &intel_encoder->base, &intel_dp_enc_funcs,
DRM_MODE_ENCODER_TMDS);
drm_encoder_helper_add(&intel_encoder->base, &intel_dp_helper_funcs);
@ -1951,14 +1950,18 @@ intel_dp_init(struct drm_device *dev, int output_reg)
ret = intel_dp_aux_native_read(intel_dp, DP_DPCD_REV,
intel_dp->dpcd,
sizeof(intel_dp->dpcd));
ironlake_edp_panel_vdd_off(intel_dp);
if (ret == sizeof(intel_dp->dpcd)) {
if (intel_dp->dpcd[0] >= 0x11)
dev_priv->no_aux_handshake = intel_dp->dpcd[3] &
DP_NO_AUX_HANDSHAKE_LINK_TRAINING;
} else {
/* if this fails, presume the device is a ghost */
DRM_ERROR("failed to retrieve link info\n");
intel_dp_destroy(&intel_connector->base);
intel_dp_encoder_destroy(&intel_dp->base.base);
return;
}
ironlake_edp_panel_vdd_off(intel_dp);
}
intel_encoder->hot_plug = intel_dp_hot_plug;