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 17:37:34 +0930
From:   "Andrew Jeffery" <andrew@...id.au>
To:     "Ulf Hansson" <ulf.hansson@...aro.org>
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 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.

Thanks for the lightning quick feedback!

Andrew