Hi, Adrian,
On 06/14/2012 10:46 PM, Adrian Hunter wrote:
> On 08/06/12 07:39, Jaehoon Chung wrote:
>> Enable eMMC background operations (BKOPS) feature.
>>
>> If URGENT_BKOPS is set after a response, note that BKOPS
>> are required. After all I/O requests are finished, run
>> BKOPS if required. Should read/write operations be requested
>> during BKOPS, first issue HPI to interrupt the ongoing BKOPS
>> and then service the request.
>> If BKOPS-STATUS is upper than LEVEL2, need to check until clear
>> the BKOPS-STATUS vaule.
>>
>> If you want to enable this feature, set MMC_CAP2_BKOPS.
>> And if you want to set the BKOPS_EN bit in ext_csd register,
>> use the MMC_CAP2_INIT_BKOPS.
>>
>> Future considerations
>> * Check BKOPS_LEVEL=1 and start BKOPS in a preventive manner.
>> * Interrupt ongoing BKOPS before powering off the card.
>> * How get BKOPS_STATUS value.(periodically send ext_csd command?)
>>
>> Signed-off-by: Jaehoon Chung <jh80.chung@xxxxxxxxxxx>
>> Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
>> Signed-off-by: Konstantin Dorfman <kdorfman@xxxxxxxxxxxxxx>
>> Signed-off-by: Maya Erez <merez@xxxxxxxxxxxxxx>
>> ---
>
> I would not expect this to work nicely with runtime PM. I expect that BKOPS
> would need to be stopped beforehand. But that would limit the time
> available for BKOPS since runtime PM would always kick in and stop it. How
> is runtime PM to be handled?
I think that add some function like the mmc_runtime_pm_suspend().
int mmc_runtime_pm_suspend()
{
if running bkops {
waiting for limit time..=> (when upper than Level2)
otherwise don't wait
stop-bkops
} else
nothing..
}
Almost runtime PM is controlled at host side.
So it's not very good that add the bkops control code at host side.
How about this? i want to get your opinion.
Best Regards,
Jaehoon Chung
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