linux-kernel - Re: [PATCH 1/2] mmc: sdhci-of-aspeed: Uphold clocks-on post-condition of set

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Date:   Fri, 30 Aug 2019 10:29:04 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Andrew Jeffery <andrew@...id.au>
Cc:     linux-mmc <linux-mmc@...r.kernel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Joel Stanley <joel@....id.au>,
        Ryan Chen <ryanchen.aspeed@...il.com>,
        openbmc@...ts.ozlabs.org,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-aspeed <linux-aspeed@...ts.ozlabs.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] mmc: sdhci-of-aspeed: Uphold clocks-on post-condition
 of set_clock()

On Fri, 30 Aug 2019 at 10:07, Andrew Jeffery <andrew@...id.au> wrote:
>
>
>
> On Fri, 30 Aug 2019, at 17:31, Ulf Hansson wrote:
> > On Fri, 30 Aug 2019 at 09:46, Andrew Jeffery <andrew@...id.au> wrote:
> > >
> > > The early-exit didn't seem to matter on the AST2500, but on the AST2600
> > > the SD clock genuinely may not be running on entry to
> > > aspeed_sdhci_set_clock(). Remove the early exit to ensure we always run
> > > sdhci_enable_clk().
> > >
> > > Signed-off-by: Andrew Jeffery <andrew@...id.au>
> > > ---
> > >  drivers/mmc/host/sdhci-of-aspeed.c | 3 ---
> > >  1 file changed, 3 deletions(-)
> > >
> > > diff --git a/drivers/mmc/host/sdhci-of-aspeed.c b/drivers/mmc/host/sdhci-of-aspeed.c
> > > index d5acb5afc50f..a9175ca85696 100644
> > > --- a/drivers/mmc/host/sdhci-of-aspeed.c
> > > +++ b/drivers/mmc/host/sdhci-of-aspeed.c
> > > @@ -55,9 +55,6 @@ static void aspeed_sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
> > >         int div;
> > >         u16 clk;
> > >
> > > -       if (clock == host->clock)
> > > -               return;
> > > -
> > >         sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
> > >
> > >         if (clock == 0)
> > > --
> > > 2.20.1
> > >
> >
> > Further down in aspeed_sdhci_set_clock() you should probably also
> > remove the assignment of host->clock = clock, as that is already
> > managed by sdhci_set_ios().
>
> Ah, I'll fix that in a v2 once I have your thoughts on patch 2/2.

I leave this one to Adrian to comment on, as he knows this better than me.

[...]

Kind regards
Uffe