From: Vincent Palatin <vpalatin@chromium.org>
Date: Thu, 13 Dec 2012 01:55:29 +0000 (-0800)
Subject: usb: properly detect empty mass storage media reader
X-Git-Url: http://git.dujemihanovic.xyz/?a=commitdiff_plain;h=8b57e2f0814a2fd9aed1fa09d8279eaf90764560;p=u-boot.git

usb: properly detect empty mass storage media reader

When a USB card reader is empty, it will return "Not Ready - medium not
present" as Key Code Qualifier. In that situation, it's useless waiting
for the full timeout since the result won't change until the user
inserts a card.

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>
---

diff --git a/common/usb_storage.c b/common/usb_storage.c
index 2d92ee1bb3..fb322b4015 100644
--- a/common/usb_storage.c
+++ b/common/usb_storage.c
@@ -970,6 +970,16 @@ static int usb_test_unit_ready(ccb *srb, struct us_data *ss)
 			return 0;
 		}
 		usb_request_sense(srb, ss);
+		/*
+		 * Check the Key Code Qualifier, if it matches
+		 * "Not Ready - medium not present"
+		 * (the sense Key equals 0x2 and the ASC is 0x3a)
+		 * return immediately as the medium being absent won't change
+		 * unless there is a user action.
+		 */
+		if ((srb->sense_buf[2] == 0x02) &&
+		    (srb->sense_buf[12] == 0x3a))
+			return -1;
 		mdelay(100);
 	} while (retries--);