[U-Boot] [PATCH 1/3] fsl_esdhc: Use mmc_set_clock to set initial speed

Stefano Babic sbabic at denx.de
Thu Dec 16 18:40:23 CET 2010


On 12/15/2010 09:20 AM, Kumar Gala wrote:
> From: Jerry Huang <Chang-Ming.Huang at freescale.com>
> 
> After booting the u-boot, and first using some SD card (such as Sandisk 2G SD
> card), because the field 'clock' of struct mmc is zero, this will cause
> the read transfer is always active and SDHC DATA line is always active,
> therefore, driver can't handle the next command.
> 
> Therefore, we use mmc_set_clock to setup both the data structure and HW
> to the initial clock speed of 400000Hz.
> 
> Signed-off-by: Jerry Huang <Chang-Ming.Huang at freescale.com>
> Signed-off-by: Kumar Gala <galak at kernel.crashing.org>
> ---

Tested on i.MX51, too.

Tested-by: Stefano Babic <sbabic at denx.de>

Regards,
Stefano Babic

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