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| author | Vincent Palatin <vpalatin@chromium.org> | 2012-12-12 17:55:29 -0800 |
|---|---|---|
| committer | Marek Vasut <marex@denx.de> | 2012-12-17 15:38:15 +0100 |
| commit | 8b57e2f0814a2fd9aed1fa09d8279eaf90764560 (patch) | |
| tree | 9c20381ef2e51866360af00489c968a1b3c2b026 /common | |
| parent | 359439d2888fdc3797903963607bb0bbd4582e08 (diff) | |
| download | u-boot-imx-8b57e2f0814a2fd9aed1fa09d8279eaf90764560.zip u-boot-imx-8b57e2f0814a2fd9aed1fa09d8279eaf90764560.tar.gz u-boot-imx-8b57e2f0814a2fd9aed1fa09d8279eaf90764560.tar.bz2 | |
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>
Diffstat (limited to 'common')
| -rw-r--r-- | common/usb_storage.c | 10 |
1 files changed, 10 insertions, 0 deletions
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 @@ 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--); |