linux-kernel - RE: [PATCH V3 01/10] mmc: tegra: fix ddr signaling for non-ddr modes

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Date:   Thu, 21 Mar 2019 15:24:37 +0000
From:   Sowjanya Komatineni <skomatineni@...dia.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>
CC:     Adrian Hunter <adrian.hunter@...el.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Harjani Ritesh <riteshh@...eaurora.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Aniruddha Tvs Rao <anrao@...dia.com>,
        linux-tegra <linux-tegra@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        DTML <devicetree@...r.kernel.org>
Subject: RE: [PATCH V3 01/10] mmc: tegra: fix ddr signaling for non-ddr modes

> >
> > ddr_signaling is set to true for DDR50 and DDR52 modes but is not set 
> > back to false for other modes. This programs incorrect host clock when 
> > mode change happens from DDR52/DDR50 to other SDR or HS modes like 
> > incase of mmc_retune where it switches from HS400 to HS DDR and then 
> > from HS DDR to HS mode and then to HS200.
> >
> > This patch fixes the ddr_signaling to set properly for non DDR modes.
> >
> > Tested-by: Jon Hunter <jonathanh@...dia.com>
> > Acked-by: Adrian Hunter <adrian.hunter@...el.com>
> > Signed-off-by: Sowjanya Komatineni <skomatineni@...dia.com>
>
> Is this a fix and/or shall I tag it for stable?
>
> The series looks good to me, however I am awaiting two more acks from Adrian on patch 2 and patch3.
>
> Kind regards
> Uffe
>
>
Thanks Uffe. Yes this is applicable for stable.

> > ---
> >  drivers/mmc/host/sdhci-tegra.c | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/drivers/mmc/host/sdhci-tegra.c 
> > b/drivers/mmc/host/sdhci-tegra.c index 32e62904c0d3..46086dd43bfb 
> > 100644
> > --- a/drivers/mmc/host/sdhci-tegra.c
> > +++ b/drivers/mmc/host/sdhci-tegra.c
> > @@ -779,6 +779,7 @@ static void tegra_sdhci_set_uhs_signaling(struct sdhci_host *host,
> >         bool set_dqs_trim = false;
> >         bool do_hs400_dll_cal = false;
> >
> > +       tegra_host->ddr_signaling = false;
> >         switch (timing) {
> >         case MMC_TIMING_UHS_SDR50:
> >         case MMC_TIMING_UHS_SDR104:
> > --
> > 2.7.4
> >