Re: [PATCH v6 2/3] mmc: dw_mmc: Honor requests to set the clock to 0(turn off clock)

[Jaehoon Chung]

Hi Doug,

On 08/24/2013 05:40 AM, Doug Anderson wrote:
> Jaehoon,
> 
> On Fri, Aug 23, 2013 at 6:21 AM, Jaehoon Chung <jh80.chung@xxxxxxxxxxx> wrote:
>> Hi Doug,
>>
>> If the clock-gating is enabled, then maybe it's continuously printed the kernel message for Bus_speed.
> 
> Can you explain?  I don't think dw_mmc has support for clock gating
> right now.  ...or are there some patches that I'm not aware of?  I
> could believe that if you've got some non-upstream clock gating
> patches that these would need to be modified to handle it...  ...but
> unless those are slated to land upstream it seems like I can't take
> them into account, can I?
If i enabled the CONFIG_MMC_CLK_GATE, the i have found the below message whenever some operation is run.
I will test more with your patch.

[    6.335000] mmc_host mmc1: Bus speed (slot 0) = 100000000Hz (slot req 52000000Hz, actual 50000000HZ div = 1)
[    6.345000] mmc_host mmc1: Bus speed (slot 0) = 100000000Hz (slot req 52000000Hz, actual 50000000HZ div = 1)
[    6.355000] mmc_host mmc1: Bus speed (slot 0) = 100000000Hz (slot req 52000000Hz, actual 50000000HZ div = 1)
[    6.365000] mmc_host mmc1: Bus speed (slot 0) = 100000000Hz (slot req 52000000Hz, actual 50000000HZ div = 1)
[    6.375000] mmc_host mmc1: Bus speed (slot 0) = 100000000Hz (slot req 52000000Hz, actual 50000000HZ div = 1)
[    6.480000] mmc_host mmc1: Bus speed (slot 0) = 100000000Hz (slot req 52000000Hz, actual 50000000HZ div = 1)
[    6.490000] mmc_host mmc1: Bus speed (slot 0) = 100000000Hz (slot req 52000000Hz, actual 50000000HZ div = 1)
[    6.500000] mmc_host mmc1: Bus speed (slot 0) = 100000000Hz (slot req 52000000Hz, actual 50000000HZ div = 1)
[    6.530000] mmc_host mmc1: Bus speed (slot 0) = 100000000Hz (slot req 52000000Hz, actual 50000000HZ div = 1)
[    6.535000] mmc_host mmc1: Bus speed (slot 0) = 100000000Hz (slot req 52000000Hz, actual 50000000HZ div = 1)
[    6.545000] mmc_host mmc1: Bus speed (slot 0) = 100000000Hz (slot req 52000000Hz, actual 50000000HZ div = 1)

Best Regards,
Jaehoon Chung
> 
> Thanks!
> 
> -Doug
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