From c5d5ab7a05bc311dd0e57bdfd925ae4720f77a58 Mon Sep 17 00:00:00 2001 From: Todd Previte Date: Wed, 15 Apr 2015 08:38:38 -0700 Subject: [PATCH] drm/i915: Add automated testing support for Displayport compliance testing 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. V2: - Addressed previous mailing list feedback - Fixed compilation issue (struct members declared in a later patch) - Updated debug messages to be more accurate - Added status checks for the DPCD read/write calls - Removed excess comments and debug messages - Fixed debug message compilation warnings - Fixed compilation issue with missing variables - Updated link training autotest to ACK V3: - Fixed the checks on the DPCD return code to be <= 0 rather than != 0 - Removed extraneous assignment of a NAK return code in the DPCD read failure case - Changed the return in the DPCD read failure case to a goto to the exit point where the status code is written to the sink - Removed FAUX test case since it's deprecated now - Removed the compliance flag assignment in handle_test_request V4: - Moved declaration of type_type here - Removed declaration of test_data (moved to a later patch) - Added reset to 0 for compliance test variables V5: - Moved test_active variable declaration and initialization out of this patch and into the patch where it's used - Changed variable name compliance_testing_active to compliance_test_active to unify the naming convention - Added initialization for compliance_test_type variable Signed-off-by: Todd Previte Reviewed-by: Paulo Zanoni Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/intel_dp.c | 75 ++++++++++++++++++++++++++++++-- drivers/gpu/drm/i915/intel_drv.h | 3 ++ 2 files changed, 74 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 5a955e33ba13..371d1e6129e5 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -4039,11 +4039,78 @@ intel_dp_get_sink_irq_esi(struct intel_dp *intel_dp, u8 *sink_irq_vector) return true; } -static void -intel_dp_handle_test_request(struct intel_dp *intel_dp) +static uint8_t intel_dp_autotest_link_training(struct intel_dp *intel_dp) +{ + uint8_t test_result = DP_TEST_ACK; + return test_result; +} + +static uint8_t intel_dp_autotest_video_pattern(struct intel_dp *intel_dp) +{ + uint8_t test_result = DP_TEST_NAK; + return test_result; +} + +static uint8_t intel_dp_autotest_edid(struct intel_dp *intel_dp) +{ + uint8_t test_result = DP_TEST_NAK; + return test_result; +} + +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; + + intel_dp->compliance_test_type = 0; + intel_dp->aux.i2c_nack_count = 0; + intel_dp->aux.i2c_defer_count = 0; + + status = drm_dp_dpcd_read(&intel_dp->aux, DP_TEST_REQUEST, &rxdata, 1); + if (status <= 0) { + DRM_DEBUG_KMS("Could not read test request from sink\n"); + goto update_status; + } + + switch (rxdata) { + case DP_TEST_LINK_TRAINING: + DRM_DEBUG_KMS("LINK_TRAINING test requested\n"); + intel_dp->compliance_test_type = DP_TEST_LINK_TRAINING; + response = intel_dp_autotest_link_training(intel_dp); + break; + case DP_TEST_LINK_VIDEO_PATTERN: + DRM_DEBUG_KMS("TEST_PATTERN test requested\n"); + intel_dp->compliance_test_type = DP_TEST_LINK_VIDEO_PATTERN; + response = intel_dp_autotest_video_pattern(intel_dp); + break; + case DP_TEST_LINK_EDID_READ: + DRM_DEBUG_KMS("EDID test requested\n"); + intel_dp->compliance_test_type = DP_TEST_LINK_EDID_READ; + response = intel_dp_autotest_edid(intel_dp); + break; + case DP_TEST_LINK_PHY_TEST_PATTERN: + DRM_DEBUG_KMS("PHY_PATTERN test requested\n"); + intel_dp->compliance_test_type = DP_TEST_LINK_PHY_TEST_PATTERN; + response = intel_dp_autotest_phy_pattern(intel_dp); + break; + default: + DRM_DEBUG_KMS("Invalid test request '%02x'\n", rxdata); + break; + } + +update_status: + status = drm_dp_dpcd_write(&intel_dp->aux, + DP_TEST_RESPONSE, + &response, 1); + if (status <= 0) + DRM_DEBUG_KMS("Could not write test response to sink\n"); } static int diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h index a7ec87266626..23a42a40abae 100644 --- a/drivers/gpu/drm/i915/intel_drv.h +++ b/drivers/gpu/drm/i915/intel_drv.h @@ -739,6 +739,9 @@ struct intel_dp { bool has_aux_irq, int send_bytes, uint32_t aux_clock_divider); + + /* Displayport compliance testing */ + unsigned long compliance_test_type; }; struct intel_digital_port { -- 2.30.2