Hi Wilson, > -----Original Message----- > From: Wilson Loi [mailto:wls...@gmail.com] > Sent: Wednesday, September 01, 2010 5:33 PM > To: Bing Zhao > Cc: Michał Mirosław; Chris Ball; linux-mmc@vger.kernel.org; Nicolas Pitre; > Andrew Morton > Subject: Re: [PATCH] sdio: add MMC_PM_SKIP_RESUME_PROBE to workaround powered > resume > > It should be necessary for this flags. > Some WLAN card will put itself either into deep sleep or host wake up mode. > They don't need to re-init after resume.
The MMC_PM_KEEP_POWER flag can be set in suspend handler before WLAN card is put into any power saving mode. When system resumes re-init attempt will be skipped as MMC_PM_KEEP_POWER is set. Regards, Bing > > > 2010/9/2 Bing Zhao <bz...@marvell.com> > > > Hi Michal, > > Thanks for your comment. > > > > -----Original Message----- > > From: Michał Mirosław [mailto:mir...@gmail.com] > > Sent: Wednesday, September 01, 2010 11:40 AM > > To: Chris Ball > > Cc: Bing Zhao; linux-mmc@vger.kernel.org; Nicolas Pitre; Andrew Morton > > Subject: Re: [PATCH] sdio: add MMC_PM_SKIP_RESUME_PROBE to workaround > powered resume > > > > 2010/8/27 Chris Ball <c...@laptop.org>: > > > Any comments on this patch from the list? > > > > > > From: Bing Zhao <bz...@marvell.com> > > > Date: Wed, 21 Jul 2010 18:46:55 -0700 > > > > > > Marvell 8686/8688 device will not respond to re-probe attemps > > > in powered resume, if the card is in sleep mode. > > > The added MMC_PM_SKIP_RESUME_PROBE flag is checked so that > > > call to mmc_sdio_init_card() can be skipped. > > [patch cut] > > > > Simplified SDIO spec v.2.00 (section 6.14 - Bus State Diagram) > > suggests, that initialization commands (CMD5, CMD3) are not accepted > > in CMD state. As the card stays in that state on powered suspend (no > > resetting CMD52 nor power cycle is issued) then reinitialization > > should be entirely skipped on resume unless the power was lost between > > suspend and resume (or card was temporarily removed from the slot). > > > With that said, skipping initialization on powered resume is needed in > general. We can just > check MMC_PM_KEEP_POWER flag to skip the card initialization. > > I will send the updated patch. > > Regards, > > Bing > > > > > > Best Regards, > > Michał Mirosław > -- > To unsubscribe from this list: send the line "unsubscribe linux-mmc" in > the body of a message to majord...@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > > > > > > -- > Best regards, > Wilson > http://blog.roodo.com/wlsloi -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
