[PATCH 01/10] drm/i915: Add automated testing support for Displayport compliance testing

Todd Previte
2014-10-09T15:38:43Z

Add the skeleton framework for supporting automation for Displayport compliance
testing. This patch adds the necessary framework for the source device to appropriately
respond to test automation requests from a sink device.

Signed-off-by: Todd Previte <tprevite@gmail.com>
---
drivers/gpu/drm/i915/intel_dp.c | 82 ++++++++++++++++++++++++++++++++++++++++-
1 file changed, 80 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 64c8e04..f7d4119 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -3959,11 +3959,89 @@ intel_dp_get_sink_irq_esi(struct intel_dp *intel_dp, u8 *sink_irq_vector)
return true;
}

+/* Displayport compliance testing - Link training */
+static uint8_t
+intel_dp_autotest_link_training(struct intel_dp *intel_dp)
+{
+ uint8_t test_result = DP_TEST_NAK;
+ return test_result;
+}
+
+/* Displayport compliance testing - Video pattern testing */
+static uint8_t
+intel_dp_autotest_video_pattern(struct intel_dp *intel_dp)
+{
+ uint8_t test_result = DP_TEST_NAK;
+ return test_result;
+}
+
+/* Displayport compliance testing - EDID operations */
+static uint8_t
+intel_dp_autotest_edid(struct intel_dp *intel_dp)
+{
+ uint8_t test_result = DP_TEST_NAK;
+ return test_result;
+}
+
+/* Displayport compliance testing - PHY pattern testing */
+static uint8_t
+intel_dp_autotest_phy_pattern(struct intel_dp *intel_dp)
+{
+ uint8_t test_result = DP_TEST_NAK;
+ return test_result;
+}
+
static void
intel_dp_handle_test_request(struct intel_dp *intel_dp)
{
- /* NAK by default */
- drm_dp_dpcd_writeb(&intel_dp->aux, DP_TEST_RESPONSE, DP_TEST_NAK);
+ uint8_t response = DP_TEST_NAK;
+ uint8_t rxdata = 0;
+ int status = 0;
+
+ DRM_DEBUG_KMS("Received automated test request\n");
+ status = drm_dp_dpcd_read(&intel_dp->aux, DP_TEST_REQUEST, &rxdata, 1);
+
+ /* ACK/NAK response based on test function response
+ Unimplemented/unsupported tests will NAK by default */
+ switch (rxdata) {
+ case DP_TEST_LINK_TRAINING:
+ DRM_DEBUG_KMS("Executing LINK_TRAINING request\n");
+ intel_dp->compliance_test_data = DP_TEST_LINK_TRAINING;
+ response = intel_dp_autotest_link_training(intel_dp);
+ break;
+ case DP_TEST_LINK_VIDEO_PATTERN:
+ DRM_DEBUG_KMS("Executing TEST_PATTERN request\n");
+ intel_dp->compliance_test_data = DP_TEST_LINK_VIDEO_PATTERN;
+ response = intel_dp_autotest_video_pattern(intel_dp);
+ break;
+ case DP_TEST_LINK_EDID_READ:
+ DRM_DEBUG_KMS("Executing EDID request\n");
+ intel_dp->compliance_test_data = DP_TEST_LINK_EDID_READ;
+ response = intel_dp_autotest_edid(intel_dp);
+ break;
+ case DP_TEST_LINK_PHY_TEST_PATTERN:
+ DRM_DEBUG_KMS("Executing PHY_PATTERN request\n");
+ intel_dp->compliance_test_data = DP_TEST_LINK_PHY_TEST_PATTERN;
+ response = intel_dp_autotest_phy_pattern(intel_dp);
+ break;
+ /* FAUX is optional in DP 1.2*/
+ case DP_TEST_LINK_FAUX_PATTERN:
+ DRM_DEBUG_KMS("FAUX_PATTERN testing not supported\n");
+ break;
+ /* Unsupported test case or something went wrong */
+ default:
+ DRM_DEBUG_KMS("Unhandled test request\n");
+ break;
+ }
+ if (status != 0) {
+ response = DP_TEST_NAK;
+ DRM_DEBUG_KMS("Error %d processing test request\n", status);
+ }
+ status = drm_dp_dpcd_write(&intel_dp->aux,
+ DP_TEST_RESPONSE,
+ &response, 1);
+ intel_dp->compliance_testing_active = 0;
+
}

static int
--
1.9.1