> -----Original Message----- > From: Ulf Hansson [mailto:ulf.hansson@xxxxxxxxxx] > Sent: Tuesday, March 10, 2015 10:22 AM > To: Alex Lemberg > Cc: Adrian Hunter; Avi Shchislowski; linux-mmc@xxxxxxxxxxxxxxx; > chris@xxxxxxxxxx > Subject: Re: [PATCH] mmc: sleep notification > > On 10 March 2015 at 17:32, Alex Lemberg <Alex.Lemberg@xxxxxxxxxxx> > wrote: > > Hi Adrian, > > > >> -----Original Message----- > >> From: Adrian Hunter [mailto:adrian.hunter@xxxxxxxxx] > >> Sent: Tuesday, March 10, 2015 6:36 AM > >> To: Avi Shchislowski; ulf.hansson@xxxxxxxxxx > >> Cc: linux-mmc@xxxxxxxxxxxxxxx; chris@xxxxxxxxxx; Alex Lemberg > >> Subject: Re: [PATCH] mmc: sleep notification > >> > >> On 10/03/15 11:36, Avi Shchislowski wrote: > >> > This patch is implements the new additional state of > >> > Power_Off_Notification - SLEEP_NOTIFICATION. > >> > Until now, the implementation of Power_Off_Notification supported > >> > only three modes - POWERED_ON (0x01), POWER_OFF_SHORT (0x02) and > >> > POWER_OFF_LONG (0x03). > >> > > >> > As part of eMMC5.0 before moving to Sleep state hosts may set the > >> > POWER_OFF_NOTIFICATION byte to SLEEP_NOTIFICATION (0x04). > >> > After setting SLEEP_NOTIFICATION, host should wait for the busy > >> > line to be de-asserted. > >> > The max timeout allowed for busy line de-assertion defined in > >> > SLEEP_NOTIFICATION_TIME byte in EXT_CSD [216]. > >> > HPI may interrupt the SLEEP_NOTIFICATION operation. > >> > In that case POWER_OFF_NOTIFICATION byte will restore to > POWERED_ON. > >> > >> Is it so that the point of SLEEP_NOTIFICATION is to notify that VCC > >> will be powered off after the device is put to sleep by CMD5? > > > > From the spec: > > > > the host should issue a power off notification (POWER_OFF_LONG, > > POWER_OFF_SHORT ) if it intends to turn off both VCC and VCCQ power > > supplies or it may use to a power off notification (SLEEP_NOTIFICATION > > ) if it intends to turn-off VCC after moving the device to Sleep state. > > Ah, so CMD5 will still need to be issued. Thanks for clarifying. > > > > >> > >> At the moment, the card does not get put to sleep if there is support > >> for power- off-notification? > > > > Driver will send Sleep only if PON is not supported... > > Nope, that's not entirely correct. > > The MMC core requires PON to be supported by the card and the host to have > MMC_CAP2_FULL_PWR_CYCLE set. Else it will send sleep (CMD5) instead. > You are right - it requires both PON and MMC_CAP2_FULL_PWR_CYCLE to be set... Thanks for mentioning this. > Kind regards > Uffe ��.n��������+%������w��{.n�����{��i��)�� jg��� �����ݢj����G���� ���j:+v���w�m������w�������h�����٥
