linux-kernel - Re: [PATCH 2/2] mmc: sdhci-of-aspeed: Fix clock divider calculation

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Message-ID: <CAPDyKFrUUfXQmsrXd8TpSxkyq6up1ZRvwYwrWPsSpCibsxJejw@mail.gmail.com>
Date:   Fri, 10 Jul 2020 11:27:59 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Eddie James <eajames@...ux.ibm.com>
Cc:     linux-clk <linux-clk@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-aspeed <linux-aspeed@...ts.ozlabs.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Andrew Jeffery <andrew@...id.au>,
        Joel Stanley <joel@....id.au>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Mike Turquette <mturquette@...libre.com>
Subject: Re: [PATCH 2/2] mmc: sdhci-of-aspeed: Fix clock divider calculation

On Thu, 9 Jul 2020 at 21:57, Eddie James <eajames@...ux.ibm.com> wrote:
>
> When calculating the clock divider, start dividing at 2 instead of 1.
> The divider is divided by two at the end of the calculation, so starting
> at 1 may result in a divider of 0, which shouldn't happen.
>
> Signed-off-by: Eddie James <eajames@...ux.ibm.com>

Applied for fixes and by adding a stable tag for v5.4+, thanks!

Kind regards
Uffe




> ---
>  drivers/mmc/host/sdhci-of-aspeed.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/host/sdhci-of-aspeed.c b/drivers/mmc/host/sdhci-of-aspeed.c
> index 56912e30c47e..a1bcc0f4ba9e 100644
> --- a/drivers/mmc/host/sdhci-of-aspeed.c
> +++ b/drivers/mmc/host/sdhci-of-aspeed.c
> @@ -68,7 +68,7 @@ static void aspeed_sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
>         if (WARN_ON(clock > host->max_clk))
>                 clock = host->max_clk;
>
> -       for (div = 1; div < 256; div *= 2) {
> +       for (div = 2; div < 256; div *= 2) {
>                 if ((parent / div) <= clock)
>                         break;
>         }
> --
> 2.24.0
>