Commit 23dd7f88 authored Feb 14, 2014 by Sujit Reddy Thumma Committed by Xiaonian Wang Apr 07, 2017

mmc: sdhci: clear interrupt status during controller reset



In some cases, it is possible that the hardware might trigger
an interrupt just about the same time the software tries to
reset the controller. In such case, the hardware interrupt will
be handled after the current thread release spin lock. This leads
to spurious interrupt handling after the completion of reset.

Change-Id: I75211adee1179b0636a918f5ceb68a072ad02a6c
Signed-off-by: Sujit Reddy Thumma <sthumma@codeaurora.org>

parent 598a4d46

drivers/mmc/host/sdhci.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -240,6 +240,10 @@ void sdhci_reset(struct sdhci_host *host, u8 mask)
		(mask & SDHCI_RESET_ALL))
		host->ops->check_power_status(host, REQ_BUS_OFF);

		/* clear pending normal/error interrupt status */
		sdhci_writel(host, sdhci_readl(host, SDHCI_INT_STATUS),
		SDHCI_INT_STATUS);

		/* hw clears the bit when it's done */
		while (sdhci_readb(host, SDHCI_SOFTWARE_RESET) & mask) {
		if (timeout == 0) {