linux-kernel - [PATCH] fix random SD/MMC card recognition failures on ARM Versatile

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Date:	Thu, 23 Nov 2006 18:46:06 +0300
From:	Vitaly Wool <vitalywool@...il.com>
To:	drzeus-mmc@...eus.cx
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] fix random SD/MMC card recognition failures on ARM
 Versatile

Hello Pierre,

currently sometimes the SD/MMC card inserted results in recognition failure on ARM Versatile board:

   <<<Plug in MMC card>>>

root@...satile:~# mmcblk0: mmc0:0001 SDMB-32 31360KiB
 mmcblk0:<3>mmcblk0: error 3 transferring data
end_request: I/O error, dev mmcblk0, sector 0
Buffer I/O error on device mmcblk0, logical block 0
mmcblk0: error 3 transferring data
end_request: I/O error, dev mmcblk0, sector 0
Buffer I/O error on device mmcblk0, logical block 0
 unable to read partition table

This patch fixes the problem.

 drivers/mmc/mmci.c |    2 ++
 1 file changed, 2 insertions(+)

Signed-off-by: Vitaly Wool <vitalywool@...il.com>

Index: linux-2.6.18/drivers/mmc/mmci.c
===================================================================
--- linux-2.6.18.orig/drivers/mmc/mmci.c
+++ linux-2.6.18/drivers/mmc/mmci.c
@@ -41,6 +41,8 @@ static void
 mmci_request_end(struct mmci_host *host, struct mmc_request *mrq)
 {
 	writel(0, host->base + MMCICOMMAND);
+	writel(0, host->base + MMCIDATACTRL);
+	writel(0, host->base + MMCIMASK1);
 
 	host->mrq = NULL;
 	host->cmd = NULL;
-
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