[PATCH 5/7] at91 : fix dirty hack for the selfrefresh function

[linux@arm.linux.org.uk (Russell King - ARM Linux)]

On Wed, Jan 11, 2012 at 03:55:38PM +0100, Daniel Lezcano wrote:
> Remove the static variable saved_lpr1 defined in the header and
> define a structure to be common with all the functions.
> That will cleanly unify the function definitions.

I don't think this is in any way a correct way to do things.

> +	struct ram_saved rs;
> @@ -49,9 +49,9 @@ static int at91_enter_idle(struct cpuidle_device *dev,
>  	else if (index == 1) {
>  		asm("b 1f; .align 5; 1:");
>  		asm("mcr p15, 0, r0, c7, c10, 4");	/* drain write buffer */
> -		saved_lpr = sdram_selfrefresh_enable();
> +		sdram_selfrefresh_enable(&rs);

What's the point of draining the write buffer if you then pass a buffer
to this function to write data to?

If the requirement is that the write buffer is drained before issue a
wait-for-interrupt instruction (in cpu_do_idle()) then this code
violates that.

That's why I went on in my discussion to a second solution.