Merge tag 'sound-3.14-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai...

[~andy/linux] / drivers / gpu / drm / i915 / intel_dp.c

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 2f517b85b3f491b4eee244c0cf0a3e4e7679a18c..57552eb386b0b1b6d735a7fb0f9b770405e5f411 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -537,6 +537,7 @@ intel_dp_aux_native_write(struct intel_dp *intel_dp,
        uint8_t msg[20];
        int msg_bytes;
        uint8_t ack;
+       int retry;
 
        if (WARN_ON(send_bytes > 16))
                return -E2BIG;
@@ -548,19 +549,21 @@ intel_dp_aux_native_write(struct intel_dp *intel_dp,
        msg[3] = send_bytes - 1;
        memcpy(&msg[4], send, send_bytes);
        msg_bytes = send_bytes + 4;
-       for (;;) {
+       for (retry = 0; retry < 7; retry++) {
                ret = intel_dp_aux_ch(intel_dp, msg, msg_bytes, &ack, 1);
                if (ret < 0)
                        return ret;
                ack >>= 4;
                if ((ack & DP_AUX_NATIVE_REPLY_MASK) == DP_AUX_NATIVE_REPLY_ACK)
-                       break;
+                       return send_bytes;
                else if ((ack & DP_AUX_NATIVE_REPLY_MASK) == DP_AUX_NATIVE_REPLY_DEFER)
-                       udelay(100);
+                       usleep_range(400, 500);
                else
                        return -EIO;
        }
-       return send_bytes;
+
+       DRM_ERROR("too many retries, giving up\n");
+       return -EIO;
 }
 
 /* Write a single byte to the aux channel in native mode */
@@ -582,6 +585,7 @@ intel_dp_aux_native_read(struct intel_dp *intel_dp,
        int reply_bytes;
        uint8_t ack;
        int ret;
+       int retry;
 
        if (WARN_ON(recv_bytes > 19))
                return -E2BIG;
@@ -595,7 +599,7 @@ intel_dp_aux_native_read(struct intel_dp *intel_dp,
        msg_bytes = 4;
        reply_bytes = recv_bytes + 1;
 
-       for (;;) {
+       for (retry = 0; retry < 7; retry++) {
                ret = intel_dp_aux_ch(intel_dp, msg, msg_bytes,
                                      reply, reply_bytes);
                if (ret == 0)
@@ -608,10 +612,13 @@ 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;
        }
+
+       DRM_ERROR("too many retries, giving up\n");
+       return -EIO;
 }
 
 static int