Hi Ulf,
On Fri, Sep 13, 2019 at 9:41 AM Ulf Hansson <ulf.hansson@xxxxxxxxxx> wrote:
> On Fri, 13 Sep 2019 at 08:37, Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> wrote:
> > On Thu, Sep 12, 2019 at 10:04 PM Niklas Soderlund
> > <niklas.soderlund@xxxxxxxxxxxx> wrote:
> > > On 2019-09-12 19:05:47 +0100, Wolfram Sang wrote:
> > > > On Wed, Sep 11, 2019 at 04:16:56PM +0200, Ulf Hansson wrote:
> > > > > On Mon, 9 Sep 2019 at 12:46, Ulf Hansson <ulf.hansson@xxxxxxxxxx> wrote:
> > > > > >
> > > > > > During probe, tmio variant drivers calls pm_runtime_enable() before they
> > > > > > call tmio_mmc_host_probe(). This doesn't work as expected, because
> > > > > > tmio_mmc_host_probe() calls pm_runtime_set_active(), which fails to set the
> > > > > > status to RPM_ACTIVE for the device, when its been enabled for runtime PM.
> > > > > >
> > > > > > Fix this by calling pm_runtime_enable() from tmio_mmc_host_probe() instead.
> > > > > > To avoid the device from being runtime suspended during the probe phase,
> > > > > > let's also increase the runtime PM usage count in tmio_mmc_host_probe().
> > > > > > Consequentially, each tmio variant driver can decide themselves when to
> > > > > > call pm_runtime_put(), to allow the device to become runtime suspended.
> > > > > >
> > > > > > Additionally, if the tmio variant driver decided to call pm_runtime_put()
> > > > > > during probe, it's is expected that it also calls pm_runtime_get_sync() to
> > > > > > restore the usage count, before it calls tmio_mmc_host_remove().
> > > > > >
> > > > > > Fixes: 7ff213193310 ("mmc: tmio: move runtime PM enablement to the driver implementations")
> > > > > > Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
> > > > >
> > > > > So I decided to apply this for my fixes branch, as to get it tested
> > > > > for a few days.
> > > > >
> > > > > If you have any objections, please tell.
> > > >
> > > > Sadly, I can't test until next week because I am still on the road. Yet,
> > > > I recall Niklas said at LPC that the patch looks good to him, at least.
> > > >
> > >
> > > Yes I think it looks good and was planing to test it. Unfortunately I'm
> > > also on the road until the end of next week ;-(
> >
> > So I decided to give it a try on my boards. Note that apart from eMMC,
> > I do not have any SD cards inserted.
>
> Thanks for testing!
[...]
> Let's have a look at that in the next steps though and fix the probe
> problems first. I can post a patch or two in an hour or so, have you
> the possibility to test this today?
Probably I can. Else it'll happen on Monday.
Thanks!
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
