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authorJesse Barnes <jbarnes@virtuousgeek.org>2011-10-20 15:09:17 -0700
committerKeith Packard <keithp@keithp.com>2011-10-20 23:22:01 -0700
commita60f0e38d72a5e24085d6e7e27a4cadc20ae268a (patch)
tree65dfb758c4b13423203aeb8535f547b5718cd256 /drivers/gpu/drm/i915/intel_dp.c
parenta2006cf5a7ad3463e7c1e9da2c4bc90499427558 (diff)
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>
Diffstat (limited to 'drivers/gpu/drm/i915/intel_dp.c')
-rw-r--r--drivers/gpu/drm/i915/intel_dp.c37
1 files changed, 37 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index e0ff9085fd86..58c827b52a29 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -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));