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Commit f28e8a4d authored by Linus Walleij's avatar Linus Walleij Committed by Russell King
Browse files

ARM: 5896/1: MMCI: work around a hardware bug in U300 



In the U300 some hardware bug makes the status flag not come up
signalling a successful write (or anything else, like an error, for
that matter) on write requests. This little quirk makes the writes
work on U300.

Signed-off-by: default avatarLinus Walleij <linus.walleij@stericsson.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 633e81a6

drivers/mmc/host/mmci.c

+11 −0
Original line number Diff line number Diff line
@@ -184,6 +184,17 @@ mmci_data_irq(struct mmci_host *host, struct mmc_data *data, 
{

	if (status & MCI_DATABLOCKEND) {

		host->data_xfered += data->blksz;

#ifdef CONFIG_ARCH_U300

		/*

		 * On the U300 some signal or other is

		 * badly routed so that a data write does

		 * not properly terminate with a MCI_DATAEND

		 * status flag. This quirk will make writes

		 * work again.

		 */

		if (data->flags & MMC_DATA_WRITE)

			status |= MCI_DATAEND;

#endif

	}

	if (status & (MCI_DATACRCFAIL|MCI_DATATIMEOUT|MCI_TXUNDERRUN|MCI_RXOVERRUN)) {

		if (status & MCI_DATACRCFAIL)