> > I'm also worried about this patch not taking in account the 8 clock cycles > > before > > shutting down the clock, contrary to the clock gating fw. > > If you power down hc, you will also gate the clock. So the sdio protocol > > might not be > > strictly followed. > As mmc spec said, 8 clock cycles is needed. That is right. > But I think if we have set the auto suspended delay for host, runtime pm core > could make sure host to > wait at least the auto suspended delay before shutting down the power of the > device. So if the auto > suspended delay is longer than 8 clock cycles, the mmc protocol can be > followed, right? I disagree. You cannot enforce this. It depends on clock speed, that can vary with sdio cards. User can change the autosuspend delay to whatever he wants, it should just change performance, but not functionality.
Why don't you just take my clock gating version? Its working well, I'm using this for 2 weeks, and follow the linux-mmc latest improvement. Regards, Pierre --------------------------------------------------------------------- Intel Corporation SAS (French simplified joint stock company) Registered headquarters: "Les Montalets"- 2, rue de Paris, 92196 Meudon Cedex, France Registration Number: 302 456 199 R.C.S. NANTERRE Capital: 4,572,000 Euros This e-mail and any attachments may contain confidential material for the sole use of the intended recipient(s). Any review or distribution by others is strictly prohibited. If you are not the intended recipient, please contact the sender and delete all copies. -- 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
