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libpayload: usb: Remove automatic clear_stall() calls from transfers 

We've recently fixed a problem where an external hard drive would choke
due to one too many CLEAR_FEATURE(HALT) commands in the XHCI stack with
"libpayload: usb: xhci: Fix STALL endpoint handling". Clearing stall
conditions from within the transfer function is wrong in general... this
is really something that is host controller agnostic and should be left
to the higher-level driver to decide. The mass storage driver (the only
one that should really encounter stalls right now) already contains the
proper amount of clear_stall() calls... any more than that is redundant
and as we found out potentially dangerous.

This patch removes automatic clear stalls from UHCI and OHCI drivers as
well to make things consistent between host controllers.

BUG=chromium:192866
TEST=None. I could borrow the original hard drive from Shawn and compile
a Snow to only use the OHCI driver to reproduce/verify this, but alas, I
am lazy (and it's really not that important).

Original-Change-Id: Ie1e4d4d2d70fa4abf8b4dabd33b10d6d4012048a
Original-Signed-off-by: Julius Werner <jwerner@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/193732
Original-Reviewed-by: Stefan Reinauer <reinauer@chromium.org>
(cherry picked from commit d46e183f3e7e0b0130becdefa6fd3ef8097df54b)
Signed-off-by: Marc Jones <marc.jones@se-eng.com>

Change-Id: Ie8f4ab3db8ec0d9a2d1e91c62967833e59c46700
Reviewed-on: http://review.coreboot.org/7223
Tested-by: build bot (Jenkins)
Reviewed-by: David Hendricks <dhendrix@chromium.org>
This commit is contained in:
Julius Werner 2014-04-08 13:37:39 -07:00 committed by Marc Jones
parent 7234d60a6e
commit ab41b9daf8
2 changed files with 1 additions and 4 deletions
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3
payloads/libpayload/drivers/usb/ohci.c
View File

@ -602,8 +602,7 @@ ohci_bulk (endpoint_t *ep, int dalen, u8 *src, int finalize)
result = dalen - result;
if (ep->direction == IN && data != src)
memcpy(src, data, result);
} else
clear_stall(ep);
}
return result;
}

2
payloads/libpayload/drivers/usb/uhci.c
View File

@ -452,8 +452,6 @@ uhci_bulk (endpoint_t *ep, int size, u8 *data, int finalize)
size -= maxpsize;
}
if (run_schedule (ep->dev, tds) == 1) {
usb_debug("Stalled. Trying to clean up.\n");
clear_stall (ep);
free (tds);
return -1;
}