Subject: RE: [v4 3/3] mmc: sdhci-cadence: Update PHY delay configuration
In-reply-to: <CAK7LNARTMF2F1_3QWqF87qV6FzeYHguWbRC5DEDnvYV1M-=9TQ@mail.gmail.com>
References: <[email protected]> <[email protected]> <CAK7LNARTMF2F1_3QWqF87qV6FzeYHguWbRC5DEDnvYV1M-=9TQ@mail.gmail.com>
Hi Masahiro
2017-03-21 02:46 AM Masahiro Yamada <[email protected]>:
> Hi Piotr,
>
>
> 2017-03-20 20:20 GMT+09:00 Piotr Sroka <[email protected]>:
> > DTS properties are used instead of fixed data
> > because PHY settings can be different for different chips/boards.
> >
> > Signed-off-by: Piotr Sroka <[email protected]>
>
>
> I found this version is a problem for me.
>
>
> > +
> > +static const struct sdhci_cdns_phy_cfg sdhci_cdns_phy_cfgs[] = {
> > + { "cdns,phy-input-delay-sd-highspeed", SDHCI_CDNS_PHY_DLY_SD_HS, },
> > + { "cdns,phy-input-delay-sd-legacy", SDHCI_CDNS_PHY_DLY_SD_DEFAULT, },
> > + { "cdns,phy-input-delay-sd-uhs-sdr12", SDHCI_CDNS_PHY_DLY_UHS_SDR12, },
> > + { "cdns,phy-input-delay-sd-uhs-sdr25", SDHCI_CDNS_PHY_DLY_UHS_SDR25, },
> > + { "cdns,phy-input-delay-sd-uhs-sdr50", SDHCI_CDNS_PHY_DLY_UHS_SDR50, },
> > + { "cdns,phy-input-delay-sd-uhs-ddr50", SDHCI_CDNS_PHY_DLY_UHS_DDR50, },
> > + { "cdns,phy-input-delay-mmc-highspeed", SDHCI_CDNS_PHY_DLY_EMMC_SDR, },
> > + { "cdns,phy-input-delay-mmc-ddr", SDHCI_CDNS_PHY_DLY_EMMC_DDR, },
> > + { "cdns,phy-dll-delay-sdclk", SDHCI_CDNS_PHY_DLY_SDCLK, },
> > + { "cdns,phy-dll-delay-sdclk-hsmmc", SDHCI_CDNS_PHY_DLY_HSMMC, },
> > + { "cdns,phy-dll-delay-strobe", SDHCI_CDNS_PHY_DLY_STROBE, },
> > +};
> > +
>
>
> I see mmc-legacy property in v1,
> but it is missing now.
>
>
> > static int sdhci_cdns_write_phy_reg(struct sdhci_cdns_priv *priv,
> > u8 addr, u8 data)
> > {
> > @@ -90,13 +113,26 @@ static int sdhci_cdns_write_phy_reg(struct sdhci_cdns_priv *priv,
> > return 0;
> > }
> >
> > -static void sdhci_cdns_phy_init(struct sdhci_cdns_priv *priv)
> > +static int sdhci_cdns_phy_init(struct device_node *np,
> > + struct sdhci_cdns_priv *priv)
> > {
> > - sdhci_cdns_write_phy_reg(priv, SDHCI_CDNS_PHY_DLY_SD_HS, 4);
> > - sdhci_cdns_write_phy_reg(priv, SDHCI_CDNS_PHY_DLY_SD_DEFAULT, 4);
> > - sdhci_cdns_write_phy_reg(priv, SDHCI_CDNS_PHY_DLY_EMMC_LEGACY, 9);
> > - sdhci_cdns_write_phy_reg(priv, SDHCI_CDNS_PHY_DLY_EMMC_SDR, 2);
> > - sdhci_cdns_write_phy_reg(priv, SDHCI_CDNS_PHY_DLY_EMMC_DDR, 3);
>
>
> I need to set SDHCI_CDNS_PHY_DLY_EMMC_LEGACY to 9 for my SoC.
>
> Maybe, do we need a DT property for this, too?
>
I can add it but could you check if you realy need it? There is no selection MMC legacy mode
in this driver.
Best Regards
Piotr Sroka