Hi Alexey,

On Nov 27, 2013, at 9:11 AM, Alexey Brodkin wrote:

Hi Jaehoon,

On Wed, 2013-11-27 at 14:33 +0900, Jaehoon Chung wrote:

...

Hi, Alexey,

I think good that use the initial fifoth value at register. Then we need not to change the value. But according to my experiment, some SoC needs to change the fifoth value.

Ok, so let's leave possibility to set "fifoth" manually (if "host->fifoth_val" != 0 then use provided value; else do nothing) on mmc controller instantiation.

Will it work for you?

ATM if no host->fifoth_val value is provided the code will calculate one and write it. Otherwise it will write the one configured.

Still I have a couple of questions to you:

1. Why there's no example/instance of "host->fifoth_val" setup/usage in

U-Boot source tree? If there was at least one I would leave "host->fifoth_val".

I would guess it's because everyone uses the default setting of 0 which results in a somewhat sane value.

2. How come there's no way to set/modify the register in question in

Linux kernel? Don't people use Linux kernel on mentioned selected SoCs without U-Boot (i.e. "fifoth" gets set by U-Boot before kernel starts)?

That's a good question for the kernel driver devs.

Regards, Alexey

Regards

-- Pantelis