drm/i915/dp: Read more DPCD registers on connection probe

For parity with radeon and nouveau, and also because I suspect we're
going to need it to get format-conversion dongles right.

Signed-off-by: Adam Jackson <ajax@redhat.com>
Reviewed-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 5 insertions, 3 deletions

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 0be85a00bb52..2f0566b12f71 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -52,7 +52,7 @@ struct intel_dp {
         uint32_t color_range;
         uint8_t link_bw;
         uint8_t lane_count;
-        uint8_t dpcd[4];
+        uint8_t dpcd[8];
         struct i2c_adapter adapter;
         struct i2c_algo_dp_aux_data algo;
         bool is_pch_edp;
@@ -1678,8 +1678,10 @@ intel_dp_detect(struct drm_connector *connector, bool force)
         else
                 status = g4x_dp_detect(intel_dp);
 
-        DRM_DEBUG_KMS("DPCD: %hx%hx%hx%hx\n", intel_dp->dpcd[0],
-                      intel_dp->dpcd[1], intel_dp->dpcd[2], intel_dp->dpcd[3]);
+        DRM_DEBUG_KMS("DPCD: %hx%hx%hx%hx%hx%hx%hx%hx\n", intel_dp->dpcd[0],
+                      intel_dp->dpcd[1], intel_dp->dpcd[2], intel_dp->dpcd[3],
+                      intel_dp->dpcd[4], intel_dp->dpcd[5], intel_dp->dpcd[6],
+                      intel_dp->dpcd[7]);
 
         if (status != connector_status_connected)
                 return status;