@@ -1613,6 +1613,7 @@ static int intel_dp_compute_bpp(struct intel_dp *intel_dp,
/* Conveniently, the link BW constants become indices with a shift...*/
int min_clock = 0;
int max_clock;
+ int link_rate_index;
int bpp, mode_rate;
int link_avail, link_clock;
int common_rates[DP_MAX_SUPPORTED_RATES] = {};
@@ -1654,6 +1655,15 @@ static int intel_dp_compute_bpp(struct intel_dp *intel_dp,
if (adjusted_mode->flags & DRM_MODE_FLAG_DBLCLK)
return false;
+ /* Use values requested by Compliance Test Request */
+ if (intel_dp->compliance.test_type == DP_TEST_LINK_TRAINING) {
+ link_rate_index = intel_dp_link_rate_index(intel_dp,
+ common_rates,
+ intel_dp->compliance.test_link_rate);
+ if (link_rate_index >= 0)
+ min_clock = max_clock = link_rate_index;
+ min_lane_count = max_lane_count = intel_dp->compliance.test_lane_count;
+ }
DRM_DEBUG_KMS("DP link computation with max lane count %i "
"max bw %d pixel clock %iKHz\n",
max_lane_count, common_rates[max_clock],
@@ -3920,8 +3930,46 @@ int intel_dp_sink_crc(struct intel_dp *intel_dp, u8 *crc)
static uint8_t intel_dp_autotest_link_training(struct intel_dp *intel_dp)
{
- uint8_t test_result = DP_TEST_ACK;
- return test_result;
+ int status = 0;
+ int min_lane_count = 1;
+ int common_rates[DP_MAX_SUPPORTED_RATES] = {};
+ int link_rate_index, test_link_rate;
+ uint8_t test_lane_count, test_link_bw;
+ /* (DP CTS 1.2)
+ * 4.3.1.11
+ */
+ /* Read the TEST_LANE_COUNT and TEST_LINK_RTAE fields (DP CTS 3.1.4) */
+ status = drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_LANE_COUNT,
+ &test_lane_count);
+
+ if (status <= 0) {
+ DRM_DEBUG_KMS("Lane count read failed\n");
+ return DP_TEST_NAK;
+ }
+ test_lane_count &= DP_MAX_LANE_COUNT_MASK;
+ /* Validate the requested lane count */
+ if (test_lane_count < min_lane_count ||
+ test_lane_count > intel_dp->max_sink_lane_count)
+ return DP_TEST_NAK;
+
+ status = drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_LINK_RATE,
+ &test_link_bw);
+ if (status <= 0) {
+ DRM_DEBUG_KMS("Link Rate read failed\n");
+ return DP_TEST_NAK;
+ }
+ /* Validate the requested link rate */
+ test_link_rate = drm_dp_bw_code_to_link_rate(test_link_bw);
+ link_rate_index = intel_dp_link_rate_index(intel_dp,
+ common_rates,
+ test_link_rate);
+ if (link_rate_index < 0)
+ return DP_TEST_NAK;
+
+ intel_dp->compliance.test_lane_count = test_lane_count;
+ intel_dp->compliance.test_link_rate = test_link_rate;
+
+ return DP_TEST_ACK;
}
static uint8_t intel_dp_autotest_video_pattern(struct intel_dp *intel_dp)
@@ -4135,9 +4183,8 @@ static void intel_dp_handle_test_request(struct intel_dp *intel_dp)
if (!intel_dp->lane_count)
return;
- /* if link training is requested we should perform it always */
- if ((intel_dp->compliance.test_type == DP_TEST_LINK_TRAINING) ||
- (!drm_dp_channel_eq_ok(link_status, intel_dp->lane_count))) {
+ /* Retrain if Channel EQ or CR not ok */
+ if (!drm_dp_channel_eq_ok(link_status, intel_dp->lane_count)) {
DRM_DEBUG_KMS("%s: channel EQ not ok, retraining\n",
intel_encoder->base.name);
@@ -4162,6 +4209,7 @@ static void intel_dp_handle_test_request(struct intel_dp *intel_dp)
intel_dp_short_pulse(struct intel_dp *intel_dp)
{
struct drm_device *dev = intel_dp_to_dev(intel_dp);
+ struct intel_encoder *intel_encoder = &dp_to_dig_port(intel_dp)->base;
u8 sink_irq_vector = 0;
u8 old_sink_count = intel_dp->sink_count;
bool ret;
@@ -4195,7 +4243,7 @@ static void intel_dp_handle_test_request(struct intel_dp *intel_dp)
sink_irq_vector);
if (sink_irq_vector & DP_AUTOMATED_TEST_REQUEST)
- DRM_DEBUG_DRIVER("Test request in short pulse not handled\n");
+ 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");
}
@@ -4203,6 +4251,11 @@ static void intel_dp_handle_test_request(struct intel_dp *intel_dp)
drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
intel_dp_check_link_status(intel_dp);
drm_modeset_unlock(&dev->mode_config.connection_mutex);
+ if (intel_dp->compliance.test_type == DP_TEST_LINK_TRAINING) {
+ DRM_DEBUG_KMS("Link Training Compliance Test requested\n");
+ /* Send a Hotplug Uevent to userspace to start modeset */
+ drm_kms_helper_hotplug_event(intel_encoder->base.dev);
+ }
return true;
}
@@ -894,6 +894,8 @@ struct intel_dp_compliance {
unsigned long test_type;
struct intel_dp_compliance_data test_data;
bool test_active;
+ int test_link_rate;
+ u8 test_lane_count;
};
struct intel_dp {
This patch adds support to handle automated DP compliance link training test requests. This patch has been tested with Unigraf DPR-120 DP Compliance device for testing Link Training Compliance. After we get a short pulse Compliance test request, test request values are read and hotplug uevent is sent in order to trigger another modeset during which the pipe is configured and link is retrained and enabled for link parameters requested by the test. v5: * Only modify the compliance structure after all validation is done (Jani Nikula) * Remove the variable test_result (Jani Nikula) v4: * Return TEST_NAK for read failures and invalid values (Jani Nikula) * Conver the test link BW to link rate before storing (Jani Nikula) v3: * Validate the test link rate and lane count as soon as the request comes (Jani Nikula) v2: * Validate the test lane count before using it in intel_dp_compute_config (Jani Nikula) Signed-off-by: Manasi Navare <manasi.d.navare@intel.com> Cc: Jani Nikula <jani.nikula@linux.intel.com> Cc: Daniel Vetter <daniel.vetter@intel.com> Cc: Ville Syrjala <ville.syrjala@linux.intel.com> --- drivers/gpu/drm/i915/intel_dp.c | 65 ++++++++++++++++++++++++++++++++++++---- drivers/gpu/drm/i915/intel_drv.h | 2 ++ 2 files changed, 61 insertions(+), 6 deletions(-)