[PATCH] mmc: sdhci-s3c: Fix mmc card I/O problem
From: Girish K S <hidden>
Date: 2011-08-26 09:28:18
Also in:
linux-mmc, linux-samsung-soc
Subsystem:
multimedia card (mmc), secure digital (sd) and sdio subsystem, secure digital host controller interface (sdhci) driver, secure digital host controller interface (sdhci) samsung driver, the rest · Maintainers:
Ulf Hansson, Adrian Hunter, Ben Dooks, Jaehoon Chung, Linus Torvalds
This patch fixes the problem in sdhci-s3c host driver for Samsung Soc's. During the card identification stage the mmc core driver enumerates for the best bus width in combination with the highest available data rate. It starts enumerating from the highest bus width (8) to lowest bus width (1). In case of few MMC cards the 4-bit bus enumeration fails and tries the 1-bit bus enumeration. When switched to 1-bit bus mode the host driver has to clear the previous bus width setting and apply the new setting. The current patch will clear the previous bus mode and apply the new mode setting. Signed-off-by: Girish K S <redacted> --- drivers/mmc/host/sdhci-s3c.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/drivers/mmc/host/sdhci-s3c.c b/drivers/mmc/host/sdhci-s3c.c
index 2bd7bf4..fe886d6 100644
--- a/drivers/mmc/host/sdhci-s3c.c
+++ b/drivers/mmc/host/sdhci-s3c.c@@ -302,6 +302,8 @@ static int sdhci_s3c_platform_8bit_width(struct sdhci_host *host, int width) ctrl &= ~SDHCI_CTRL_8BITBUS; break; default: + ctrl &= ~SDHCI_CTRL_4BITBUS; + ctrl &= ~SDHCI_CTRL_8BITBUS; break; }
--
1.7.1