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Commit 89667383 authored by Jesse Barnes's avatar Jesse Barnes Committed by Chris Wilson
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drm/i915/dp: cache eDP DPCD data 



Cache the first 4 bytes of DPCD data in the eDP case.  It's unlikely to
change and can save us some trouble at link training time.

Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
parent 8088699f

drivers/gpu/drm/i915/i915_drv.h

+1 −0
Original line number Diff line number Diff line
@@ -350,6 +350,7 @@ typedef struct drm_i915_private { 
		int bpp;

		struct edp_power_seq pps;

	} edp;

	bool no_aux_handshake;



	struct notifier_block lid_notifier;

drivers/gpu/drm/i915/intel_dp.c

+20 −0
Original line number Diff line number Diff line
@@ -1724,6 +1724,26 @@ intel_dp_init(struct drm_device *dev, int output_reg) 


	intel_dp_i2c_init(intel_dp, intel_connector, name);



	/* Cache some DPCD data in the eDP case */

	if (is_edp(intel_dp)) {

		int ret;

		bool was_on;



		was_on = ironlake_edp_panel_on(intel_dp);

		ret = intel_dp_aux_native_read(intel_dp, DP_DPCD_REV,

					       intel_dp->dpcd,

					       sizeof(intel_dp->dpcd));

		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 {

			DRM_ERROR("failed to retrieve link info\n");

		}

		if (!was_on)

			ironlake_edp_panel_off(dev);

	}



	intel_encoder->hot_plug = intel_dp_hot_plug;



	if (is_edp(intel_dp)) {