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Date: Tue, 06 Oct 2015 16:44:50 +0200 From: Gregory CLEMENT <gregory.clement@...e-electrons.com> To: Marcin Wojtas <mw@...ihalf.com> Cc: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-mmc@...r.kernel.org, ulf.hansson@...aro.org, sebastian.hesselbarth@...il.com, andrew@...n.ch, jason@...edaemon.net, thomas.petazzoni@...e-electrons.com, nadavh@...vell.com, alior@...vell.com, tawfik@...vell.com, jaz@...ihalf.com, <stable@...r.kernel.org> Subject: Re: [PATCH 2/8] mmc: sdhci-pxav3: disable clock inversion for HS MMC cards Hi Marcin, On mar., oct. 06 2015, Marcin Wojtas <mw@...ihalf.com> wrote: > From: Nadav Haklai <nadavh@...vell.com> > > According to 'FE-2946959' erratum the clock inversion option is > needed to support slow frequencies when the card input hold time > requirement is high. This setting is not required for high speed > MMC and might cause timing violation. > > Signed-off-by: Nadav Haklai <nadavh@...vell.com> > Cc: <stable@...r.kernel.org> # v4.2 Seems OK too. Reviewed-by: Gregory CLEMENT <gregory.clement@...e-electrons.com> Thanks, Gregory > --- > drivers/mmc/host/sdhci-pxav3.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/drivers/mmc/host/sdhci-pxav3.c b/drivers/mmc/host/sdhci-pxav3.c > index 976cddd..89a9e49 100644 > --- a/drivers/mmc/host/sdhci-pxav3.c > +++ b/drivers/mmc/host/sdhci-pxav3.c > @@ -291,6 +291,9 @@ static void pxav3_set_uhs_signaling(struct sdhci_host *host, unsigned int uhs) > uhs == MMC_TIMING_UHS_DDR50) { > reg_val &= ~SDIO3_CONF_CLK_INV; > reg_val |= SDIO3_CONF_SD_FB_CLK; > + } else if (uhs == MMC_TIMING_MMC_HS) { > + reg_val &= ~SDIO3_CONF_CLK_INV; > + reg_val &= ~SDIO3_CONF_SD_FB_CLK; > } else { > reg_val |= SDIO3_CONF_CLK_INV; > reg_val &= ~SDIO3_CONF_SD_FB_CLK; > -- > 1.8.3.1 > -- Gregory Clement, Free Electrons Kernel, drivers, real-time and embedded Linux development, consulting, training and support. http://free-electrons.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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