linux-kernel - Re: [PATCH 4/5] mmc: core: Add support for graceful host removal for eMMC

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Message-ID: <Z-pSCVf9OJfCzKbS@shikoro>
Date: Mon, 31 Mar 2025 10:27:53 +0200
From: Wolfram Sang <wsa+renesas@...g-engineering.com>
To: Ulf Hansson <ulf.hansson@...aro.org>
Cc: Avri Altman <Avri.Altman@...disk.com>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
	"linux-renesas-soc@...r.kernel.org" <linux-renesas-soc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/5] mmc: core: Add support for graceful host removal for
 eMMC


> > > +     _mmc_suspend(host, MMC_POWEROFF_UNBIND);
> > Couldn't find how _mmc_suspend handles this new power off flag?
> 
> Right. You need to look closer at mmc_may_poweroff_notify() as it
> should return false if MMC_POWEROFF_UNBIND, unless
> MMC_CAP2_FULL_PWR_CYCLE.

And this is what we need for Renesas SDHI which only has
MMC_CAP2_FULL_PWR_CYCLE_IN_SUSPEND. What this means is:
For suspend, we have some blackbox firmware (PSCI) handling the power
cycle. But for unbind, we cannot trigger the firmware, so we can't use
the notification but need mmc_sleep().

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