[PATCH] ARM: imx: add cpuidle support for i.mx6sl

[Anson.Huang at freescale.com]

OK, then I will generate a patch of accessing clk register directly to fix this issue, otherwise, we will meet it when the cpufreq driver and cpuidle driver are merged.

Best Regards.
Anson Huang
 
Freescale Semiconductor Shanghai
Tel:021-28937058

>-----Original Message-----
>From: Shawn Guo [mailto:shawn.guo at linaro.org]
>Sent: Monday, January 27, 2014 2:15 PM
>To: Huang Yongcai-B20788
>Cc: John Tobias; <linux-arm-kernel at lists.infradead.org>
>Subject: Re: [PATCH] ARM: imx: add cpuidle support for i.mx6sl
>
>On Fri, Jan 24, 2014 at 02:05:09AM +0000, Anson.Huang at freescale.com wrote:
>> Hi, Tobias
>> 	Yes, the root cause is the reschedule introduced by the usleep, for our
>internal release, we use busy loop for PLL wait lock, just removing the usleep
>is not good enough, as the PLL hardware may need about 60~90us to lock, during
>this period, there will be no clock output in PLL. So, we need to figure out a
>way to fix this issue, either using busy loop instead of usleep or access the
>ccm register to adjust ARM divider instead of calling clk APIs.
>>
>
>Yes, since imx6sl_set_wait_clk() is provided by imx6sl clock driver, it's
>reasonable to just access register than going through clk API.
>
>Shawn