drm/i915/dp: increase native aux defer retry timeout

Give more slack to sink devices before retrying on native aux
defer. AFAICT the 100 us timeout was not based on the DP spec.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Cc: stable@vger.kernel.org (on Jani's request)
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 2f517b85b3f491b4eee244c0cf0a3e4e7679a18c..c36960488c89cd9d64e4fc30265030888f6c2938 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -556,7 +556,7 @@ intel_dp_aux_native_write(struct intel_dp *intel_dp,
                if ((ack & DP_AUX_NATIVE_REPLY_MASK) == DP_AUX_NATIVE_REPLY_ACK)
                        break;
                else if ((ack & DP_AUX_NATIVE_REPLY_MASK) == DP_AUX_NATIVE_REPLY_DEFER)
-                       udelay(100);
+                       usleep_range(400, 500);
                else
                        return -EIO;
        }
@@ -608,7 +608,7 @@ 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)
-                       udelay(100);
+                       usleep_range(400, 500);
                else
                        return -EIO;
        }