On Wed, Dec 11, 2013 at 11:35:17AM +0800, Dong Aisheng wrote:

This actually is the register value, not the max timeout counter value.
Then you may want define the API as:
unsigned int    (*get_max_timeout_val)(struct sdhci_host *host);

Yes, something like that.

But i don't think it's necessary to do the max timeout setting in two steps.
First, deinfe a API to get the max timeout counter val,
Second, write this val into register.
Why not simply implement .set_timeout and handle the details in
platform specific
host driver respectively?

Well, that's how sdhci host driver is structured.  Doing so leaves the
least details to platform driver, and calling sdhci_writeb() to access
SDHCI_TIMEOUT_CONTROL in sdhci-esdhc-imx seems a layer violation to me.

Furthermore, this API does not  help for the patch#1 issue.

Oh, they two different issues, and should be addressed by different
hooks.

Shawn