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>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 2f517b85b3f4..c36960488c89 100644
--- 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;
         }