Add the skeleton framework for supporting automation for Displayport compliance
testing. This patch
adds the necessary framework for the source device to appropriately responded
to test automation
requests from a sink device.
Signed-off-by: Todd Previte <tprev...@gmail.com>
---
drivers/gpu/drm/i915/intel_dp.c | 84 ++++++++++++++++++++++++++++++++++++++++-
1 file changed, 82 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index b5ec489..3bd1780 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -3328,11 +3328,91 @@ intel_dp_get_sink_irq(struct intel_dp *intel_dp, u8
*sink_irq_vector)
sink_irq_vector, 1) == 1;
}
+/* 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;
+}
+
+/* Displayport compliance testing - Fast AUX transactions (optional) */
+static uint8_t
+intel_dp_autotest_faux_pattern(struct intel_dp *intel_dp)
+{
+ uint8_t test_result = DP_TEST_NAK;
+ printk("Displayport: Fast AUX (FAUX) not supported.\n");
+ 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 ret = 0;
+
+ DRM_DEBUG_KMS("Displayport: Received automated test request\n");
+ /* Read DP_TEST_REQUEST register to identify the requested test */
+ ret = drm_dp_dpcd_read(&intel_dp->aux, DP_TEST_REQUEST, &rxdata, 1);
+
+ /* Determine which test has been requested */
+ switch (rxdata) {
+ /* ACK/NAK response based on test function response
+ Unimplemented/unsupported tests will NAK */
+ case DP_TEST_LINK_TRAINING:
+ DRM_DEBUG_KMS("Displayport: Executing LINK_TRAINING
request\n");
+ response = intel_dp_autotest_link_training(intel_dp);
+ break;
+ case DP_TEST_LINK_VIDEO_PATTERN:
+ DRM_DEBUG_KMS("Displayport: Executing TEST_PATTERN
request\n");
+ response = intel_dp_autotest_video_pattern(intel_dp);
+ break;
+ case DP_TEST_LINK_EDID_READ:
+ DRM_DEBUG_KMS("Displayport: Executing EDID request\n");
+ response = intel_dp_autotest_edid(intel_dp);
+ break;
+ case DP_TEST_LINK_PHY_TEST_PATTERN:
+ DRM_DEBUG_KMS("Displayport: Executing PHY_PATTERN
request\n");
+ 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("Displayport: Executing FAUX_PATTERN
request \n");
+ response = intel_dp_autotest_faux_pattern(intel_dp);
+ break;
+ /* Unsupported test case or something went wrong */
+ default:
+ /* Log error here for unhandled test request */
+ DRM_DEBUG_KMS("Displayport: Error - unhandled automated
test request\n");
+ break;
+ }
+ /* Send the response from the test result */
+ ret = drm_dp_dpcd_write(&intel_dp->aux, DP_TEST_RESPONSE, &response, 1);
}
/*
--
1.9.1
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