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 2d92ee1..fb322b4 100644
--- a/common/usb_storage.c
+++ b/common/usb_storage.c
@@ -970,6 +970,16 @@
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--);