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ARM: 5966/1: at91_udc HW glitch

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Add some delay to avoid reading CSR TXCOUNT too early after
updating it.

For more info about this HW glitch see:
http://lists.arm.linux.org.uk/lurker/message/20090325.150843.f515c02f.en.html
http://lists.infradead.org/pipermail/linux-arm-kernel/attachments/20100129/10ba0f8b/attachment.el
http://lists.infradead.org/pipermail/linux-arm-kernel/attachments/20100203/09cdb3b4/attachment.el
http://lists.infradead.org/pipermail/linux-arm-kernel/attachments/20100203/08b5b249/attachment.el

First applied: "Fix soft lockup in at91 udc driver"
http://www.arm.linux.org.uk/developer/patches/viewpatch.php?id=5965

Signed-off-by: Anti Sullin <anti.sullin@artecdesign.ee>
Signed-off-by: Harro Haan <hrhaan@gmail.com>
Acked-by: Remy Bohmer <linux@bohmer.net>
Acked-by: Andrew Victor <linux@maxim.org.za>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Harro Haan 2010-03-01 17:54:55 +01:00 committed by Russell King
parent e8faff7330
commit 7622537419
1 changed files with 7 additions and 0 deletions
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7
drivers/usb/gadget/at91_udc.c
View File

@ -366,6 +366,13 @@ rescan:
if (is_done)
done(ep, req, 0);
else if (ep->is_pingpong) {
/*
* One dummy read to delay the code because of a HW glitch:
* CSR returns bad RXCOUNT when read too soon after updating
* RX_DATA_BK flags.
*/
csr = __raw_readl(creg);
bufferspace -= count;
buf += count;
goto rescan;