[Bug 71701] Regression, Dual-Head, i915 mode-setting driver, "pipe B stuck"

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=71701

--- Comment #8 from Jani Nikula <jani.nikula at intel.com> ---
Please try this:

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index bb66f9301cd9..faf377443ef5 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -597,7 +597,7 @@ intel_dp_aux_native_write(struct intel_dp *intel_dp,
         if ((ack & DP_AUX_NATIVE_REPLY_MASK) == DP_AUX_NATIVE_REPLY_ACK)
             return send_bytes;
         else if ((ack & DP_AUX_NATIVE_REPLY_MASK) ==
DP_AUX_NATIVE_REPLY_DEFER)
-            usleep_range(400, 500);
+            usleep_range((retry + 1) * 400, (retry + 1) * 500);
         else
             return -EIO;
     }
@@ -652,7 +652,7 @@ intel_dp_aux_native_read(struct intel_dp *intel_dp,
             return ret - 1;
         }
         else if ((ack & DP_AUX_NATIVE_REPLY_MASK) ==
DP_AUX_NATIVE_REPLY_DEFER)
-            usleep_range(400, 500);
+            usleep_range((retry + 1) * 400, (retry + 1) * 500);
         else
             return -EIO;
     }

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