linux-kernel - [26/28] mmc: atmel-mci: save and restore sdioirq when soft reset is performed

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Message-Id: <20120217005537.481711015@linuxfoundation.org>
Date:	Thu, 16 Feb 2012 16:56:00 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk,
	Ludovic Desroches <ludovic.desroches@...el.com>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Chris Ball <cjb@...top.org>
Subject: [26/28] mmc: atmel-mci: save and restore sdioirq when soft reset is performed

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ludovic Desroches <ludovic.desroches@...el.com>

commit 18ee684b8ab666329e0a0a72d8b70f16fb0e2243 upstream.

Sometimes a software reset is needed. Then some registers are saved and
restored but the interrupt mask register is missing. It causes issues
with sdio devices whose interrupts are masked after reset.

Signed-off-by: Ludovic Desroches <ludovic.desroches@...el.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@...el.com>
Signed-off-by: Chris Ball <cjb@...top.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/mmc/host/atmel-mci.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -965,11 +965,14 @@ static void atmci_start_request(struct a
 	host->data_status = 0;
 
 	if (host->need_reset) {
+		iflags = atmci_readl(host, ATMCI_IMR);
+		iflags &= (ATMCI_SDIOIRQA | ATMCI_SDIOIRQB);
 		atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
 		atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
 		atmci_writel(host, ATMCI_MR, host->mode_reg);
 		if (host->caps.has_cfg_reg)
 			atmci_writel(host, ATMCI_CFG, host->cfg_reg);
+		atmci_writel(host, ATMCI_IER, iflags);
 		host->need_reset = false;
 	}
 	atmci_writel(host, ATMCI_SDCR, slot->sdc_reg);


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