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Date: Mon, 11 Jan 2021 19:06:24 +0100 From: Ulf Hansson <ulf.hansson@...aro.org> To: Marcin Wojtas <mw@...ihalf.com> Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>, Ziji Hu <huziji@...vell.com>, Adrian Hunter <adrian.hunter@...el.com>, jaz@...ihalf.com, tn@...ihalf.com, Kostya Porotchkin <kostap@...vell.com>, Alex Leibovich <alexl@...vell.com>, "# 4.0+" <stable@...r.kernel.org> Subject: Re: [PATCH] mmc: sdhci-xenon: fix 1.8v regulator stabilization On Fri, 11 Dec 2020 at 15:17, Marcin Wojtas <mw@...ihalf.com> wrote: > > From: Alex Leibovich <alexl@...vell.com> > > Automatic Clock Gating is a feature used for the power > consumption optimisation. It turned out that > during early init phase it may prevent the stable voltage > switch to 1.8V - due to that on some platfroms an endless > printout in dmesg can be observed: > "mmc1: 1.8V regulator output did not became stable" > Fix the problem by disabling the ACG at very beginning > of the sdhci_init and let that be enabled later. > > Fixes: 3a3748dba881 ("mmc: sdhci-xenon: Add Marvell Xenon SDHC core functionality") > Signed-off-by: Alex Leibovich <alexl@...vell.com> > Signed-off-by: Marcin Wojtas <mw@...ihalf.com> > Cc: stable@...r.kernel.org Applied for fixes (by fixing the typos), thanks! Kind regards Uffe > --- > drivers/mmc/host/sdhci-xenon.c | 7 ++++++- > 1 file changed, 6 insertions(+), 1 deletion(-) > > diff --git a/drivers/mmc/host/sdhci-xenon.c b/drivers/mmc/host/sdhci-xenon.c > index c67611fdaa8a..4b05f6fdefb4 100644 > --- a/drivers/mmc/host/sdhci-xenon.c > +++ b/drivers/mmc/host/sdhci-xenon.c > @@ -168,7 +168,12 @@ static void xenon_reset_exit(struct sdhci_host *host, > /* Disable tuning request and auto-retuning again */ > xenon_retune_setup(host); > > - xenon_set_acg(host, true); > + /* > + * The ACG should be turned off at the early init time, in order > + * to solve a possile issues with the 1.8V regulator stabilization. > + * The feature is enabled in later stage. > + */ > + xenon_set_acg(host, false); > > xenon_set_sdclk_off_idle(host, sdhc_id, false); > > -- > 2.29.0 >
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