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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: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Keith Packard <keithp@keithp.com>
This commit is contained in:
Jesse Barnes 2011-10-20 15:09:17 -07:00 committed by Keith Packard
parent a2006cf5a7
commit a60f0e38d7
2 changed files with 62 additions and 0 deletions
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37
drivers/gpu/drm/i915/intel_dp.c
View File

@ -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));

25
include/drm/drm_dp_helper.h
View File

@ -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