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Commit a60f0e38 authored by Jesse Barnes's avatar Jesse Barnes Committed by Keith Packard
Browse files

drm/i915: add DP test request handling 



DPCD 1.1+ adds some automated test infrastructure support.  Add support
for reading the IRQ source and jumping to a test handling routine if
needed.  Subsequent patches will handle particular tests; this patch
just ACKs any requested tests by default.

Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: default avatarKeith Packard <keithp@keithp.com>
parent a2006cf5

drivers/gpu/drm/i915/intel_dp.c

+37 −0
Original line number Diff line number Diff line
@@ -1776,6 +1776,27 @@ intel_dp_get_dpcd(struct intel_dp *intel_dp) 
	return false;

}



static bool

intel_dp_get_sink_irq(struct intel_dp *intel_dp, u8 *sink_irq_vector)

{

	int ret;



	ret = intel_dp_aux_native_read_retry(intel_dp,

					     DP_DEVICE_SERVICE_IRQ_VECTOR,

					     sink_irq_vector, 1);

	if (!ret)

		return false;



	return true;

}



static void

intel_dp_handle_test_request(struct intel_dp *intel_dp)

{

	/* NAK by default */

	intel_dp_aux_native_write_1(intel_dp, DP_TEST_RESPONSE, DP_TEST_ACK);

}



/*

 * According to DP spec

 * 5.1.2:
@@ -1788,6 +1809,8 @@ intel_dp_get_dpcd(struct intel_dp *intel_dp) 
static void

intel_dp_check_link_status(struct intel_dp *intel_dp)

{

	u8 sink_irq_vector;



	if (intel_dp->dpms_mode != DRM_MODE_DPMS_ON)

		return;
@@ -1806,6 +1829,20 @@ intel_dp_check_link_status(struct intel_dp *intel_dp) 
		return;

	}



	/* Try to read the source of the interrupt */

	if (intel_dp->dpcd[DP_DPCD_REV] >= 0x11 &&

	    intel_dp_get_sink_irq(intel_dp, &sink_irq_vector)) {

		/* Clear interrupt source */

		intel_dp_aux_native_write_1(intel_dp,

					    DP_DEVICE_SERVICE_IRQ_VECTOR,

					    sink_irq_vector);



		if (sink_irq_vector & DP_AUTOMATED_TEST_REQUEST)

			intel_dp_handle_test_request(intel_dp);

		if (sink_irq_vector & (DP_CP_IRQ | DP_SINK_SPECIFIC_IRQ))

			DRM_DEBUG_DRIVER("CP or sink specific irq unhandled\n");

	}



	if (!intel_channel_eq_ok(intel_dp)) {

		DRM_DEBUG_KMS("%s: channel EQ not ok, retraining\n",

			      drm_get_encoder_name(&intel_dp->base.base));

include/drm/drm_dp_helper.h

+25 −0
Original line number Diff line number Diff line
@@ -153,6 +153,12 @@ 
# define DP_PSR_CRC_VERIFICATION	    (1 << 2)

# define DP_PSR_FRAME_CAPTURE		    (1 << 3)



#define DP_DEVICE_SERVICE_IRQ_VECTOR	    0x201

# define DP_REMOTE_CONTROL_COMMAND_PENDING  (1 << 0)

# define DP_AUTOMATED_TEST_REQUEST	    (1 << 1)

# define DP_CP_IRQ			    (1 << 2)

# define DP_SINK_SPECIFIC_IRQ		    (1 << 6)



#define DP_LANE0_1_STATUS		    0x202

#define DP_LANE2_3_STATUS		    0x203

# define DP_LANE_CR_DONE		    (1 << 0)
@@ -185,6 +191,25 @@ 
# define DP_ADJUST_PRE_EMPHASIS_LANE1_MASK   0xc0

# define DP_ADJUST_PRE_EMPHASIS_LANE1_SHIFT  6



#define DP_TEST_REQUEST			    0x218

# define DP_TEST_LINK_TRAINING		    (1 << 0)

# define DP_TEST_LINK_PATTERN		    (1 << 1)

# define DP_TEST_LINK_EDID_READ		    (1 << 2)

# define DP_TEST_LINK_PHY_TEST_PATTERN	    (1 << 3) /* DPCD >= 1.1 */



#define DP_TEST_LINK_RATE		    0x219

# define DP_LINK_RATE_162		    (0x6)

# define DP_LINK_RATE_27		    (0xa)



#define DP_TEST_LANE_COUNT		    0x220



#define DP_TEST_PATTERN			    0x221



#define DP_TEST_RESPONSE		    0x260

# define DP_TEST_ACK			    (1 << 0)

# define DP_TEST_NAK			    (1 << 1)

# define DP_TEST_EDID_CHECKSUM_WRITE	    (1 << 2)



#define DP_SET_POWER                        0x600

# define DP_SET_POWER_D0                    0x1

# define DP_SET_POWER_D3                    0x2