linux-kernel - Re: [PATCH v5 1/2] mmc: sdhci-msm: Warn about overclocking SD/MMC

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Message-ID: <CAD=FV=Xt0O7WOe-hsiqJ7Jqhgs7TQ_c-_BtyAuj0D2Yxi-TqEg@mail.gmail.com>
Date:   Fri, 8 Jan 2021 13:21:00 -0800
From:   Doug Anderson <dianders@...omium.org>
To:     Ulf Hansson <ulf.hansson@...aro.org>,
        Adrian Hunter <adrian.hunter@...el.com>
Cc:     Taniya Das <tdas@...eaurora.org>,
        Veerabhadrarao Badiganti <vbadigan@...eaurora.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Andy Gross <agross@...nel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux MMC List <linux-mmc@...r.kernel.org>
Subject: Re: [PATCH v5 1/2] mmc: sdhci-msm: Warn about overclocking SD/MMC

Ulf,

On Mon, Dec 14, 2020 at 9:23 AM Douglas Anderson <dianders@...omium.org> wrote:
>
> As talked about in commit 5e4b7e82d497 ("clk: qcom: gcc-sdm845: Use
> floor ops for sdcc clks"), most clocks handled by the Qualcomm clock
> drivers are rounded _up_ by default instead of down.  We should make
> sure SD/MMC clocks are always rounded down in the clock drivers.
> Let's add a warning in the Qualcomm SDHCI driver to help catch the
> problem.
>
> This would have saved a bunch of time [1].
>
> NOTE: this doesn't actually fix any problems, it just makes it obvious
> to devs that there is a problem and that should be an indication to
> fix the clock driver.
>
> [1] http://lore.kernel.org/r/20201210102234.1.I096779f219625148900fc984dd0084ed1ba87c7f@changeid
>
> Suggested-by: Stephen Boyd <swboyd@...omium.org>
> Signed-off-by: Douglas Anderson <dianders@...omium.org>
> Reviewed-by: Stephen Boyd <swboyd@...omium.org>
> Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> ---
>
> (no changes since v4)
>
> Changes in v4:
> - Emphasize in the commit message that this itself doesn't fix anything.
>
> Changes in v3:
> - Proper printf format code.
>
> Changes in v2:
> - Store rate in unsigned long, not unsigned int.
> - Reuse the clk_get_rate() in the later print.
>
>  drivers/mmc/host/sdhci-msm.c | 15 +++++++++++++--
>  1 file changed, 13 insertions(+), 2 deletions(-)

Is there anything you need me to do for this patch and the next one?
They are both reviewed / Acked and hopefully have sat around long
enough that folks who took a long holiday break had a chance to shout
if they were going to, so I think they could land.  ;-)  Please yell
if there's something you need me to do, or feel free to tell me to sit
quietly and be patient.

Thanks!

-Doug