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