linux-kernel - Re: [PATCH v3 0/4] scsi: add runtime PM workaround for SD cardreaders

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Date:   Sun, 28 Mar 2021 17:16:23 +0200
From:   Martin Kepplinger <martin.kepplinger@...i.sm>
To:     Alan Stern <stern@...land.harvard.edu>
Cc:     bvanassche@....org, jejb@...ux.ibm.com,
        linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
        linux-pm@...r.kernel.org, martin.petersen@...cle.com
Subject: Re: [PATCH v3 0/4] scsi: add runtime PM workaround for SD
 cardreaders

Am Sonntag, dem 28.03.2021 um 10:58 -0400 schrieb Alan Stern:
> On Sun, Mar 28, 2021 at 12:25:27PM +0200, Martin Kepplinger wrote:
> > hi,
> > 
> > In short: there are SD cardreaders that send MEDIA_CHANGED on
> > (runtime) resume. We cannot use runtime PM with these devices as
> > I/O always fails. I'd like to discuss a way to fix this
> > or at least allow us to work around this problem:
> 
> In fact, as far as I know _all_ USB SD card readers send Media
> Changed 
> notifications on resume.  Maybe there are some that don't, but I
> haven't 
> heard of any.
> 
> Alan Stern

that makes me worry less about enabling this for "Generic", "Ultra HS-
SD/MMC" then. thanks.

it also makes me think about whether sd should implement this even for
system-resume (not only runtime resume), but I guess that's a minor
issue we could add at any time later.

                               martin