[PATCH] mmc: core: add auto bkops support
jh80.chung at samsung.com
Mon Jun 20 17:38:16 PDT 2016
On 06/20/2016 10:33 PM, Alex Lemberg wrote:
> Hi Shawn,
>>>> +static int mmc_stop_auto_bkops(struct mmc_card *card)
>>>> + int err = 0;
>>>> + if (!card->ext_csd.auto_bkops_en)
>>>> + return 0;
>>> Shouldn’t the BKOPS_STATUS be checked prior to disabling the BKOPS activity of the device?
>> Hrmm.. I read the whole section of spec for it, and I did find this
>> requirement for manul bkops but not for the auto one. So what should we
>> do if using the auto one?
> In case of AUTO BKOPS, the eMMC Device should perform internal GC
> in the same way as in case of MANUAL BKOPS.
> The only difference is a host awareness.
> Although there is no requirement in the spec, I think the driver can
> give some time to the device to perform/complete its internal GC during the idle time.
> Thus I think we can check the BKOPS_STATUS on Runtime suspend.
I'm not sure we can check BKOPS_STATUS when use the AUTO_BKOPS.
I have also read the SPEC, but it's not clearly for checking the BKOPS_STATUS.
Just i understood that it should be operated without a host's awareness.
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