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[217.229.28.128]) by smtp.gmail.com with ESMTPSA id j8-v6sm7096667wrp.11.2018.08.09.04.40.46 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Thu, 09 Aug 2018 04:40:46 -0700 (PDT) Date: Thu, 9 Aug 2018 13:40:46 +0200 From: Thierry Reding To: Aapo Vienamo Cc: Ulf Hansson , Rob Herring , Mark Rutland , Jonathan Hunter , Adrian Hunter , Mikko Perttunen , linux-mmc@vger.kernel.org, devicetree@vger.kernel.org, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 2/8] mmc: tegra: Parse and program DQS trim value Message-ID: <20180809114046.GJ21639@ulmo> References: <1533650404-18125-1-git-send-email-avienamo@nvidia.com> <1533650404-18125-3-git-send-email-avienamo@nvidia.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="LG0Ll82vYr46+VA1" Content-Disposition: inline In-Reply-To: <1533650404-18125-3-git-send-email-avienamo@nvidia.com> User-Agent: Mutt/1.10.0 (2018-05-17) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --LG0Ll82vYr46+VA1 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Aug 07, 2018 at 04:59:58PM +0300, Aapo Vienamo wrote: > Parse and program the HS400 DQS trim value from dt. Program a fallback > value in case the property is missing. >=20 > Signed-off-by: Aapo Vienamo > --- > drivers/mmc/host/sdhci-tegra.c | 32 +++++++++++++++++++++++++++++--- > 1 file changed, 29 insertions(+), 3 deletions(-) >=20 > diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegr= a.c > index 7f1ac4a..426f7ea 100644 > --- a/drivers/mmc/host/sdhci-tegra.c > +++ b/drivers/mmc/host/sdhci-tegra.c > @@ -43,6 +43,10 @@ > #define SDHCI_CLOCK_CTRL_PADPIPE_CLKEN_OVERRIDE BIT(3) > #define SDHCI_CLOCK_CTRL_SPI_MODE_CLKEN_OVERRIDE BIT(2) > =20 > +#define SDHCI_TEGRA_VENDOR_CAP_OVERRIDES 0x10c > +#define SDHCI_TEGRA_CAP_OVERRIDES_DQS_TRIM_MASK 0x00003f00 > +#define SDHCI_TEGRA_CAP_OVERRIDES_DQS_TRIM_SHIFT 8 > + > #define SDHCI_TEGRA_VENDOR_MISC_CTRL 0x120 > #define SDHCI_MISC_CTRL_ENABLE_SDR104 0x8 > #define SDHCI_MISC_CTRL_ENABLE_SDR50 0x10 > @@ -112,6 +116,7 @@ struct sdhci_tegra { > =20 > u32 default_tap; > u32 default_trim; > + u32 dqs_trim; > }; > =20 > static u16 tegra_sdhci_readw(struct sdhci_host *host, int reg) > @@ -500,7 +505,7 @@ static void tegra_sdhci_parse_pad_autocal_dt(struct s= dhci_host *host) > autocal->pull_down_hs400 =3D autocal->pull_down_1v8; > } > =20 > -static void tegra_sdhci_parse_default_tap_and_trim(struct sdhci_host *ho= st) > +static void tegra_sdhci_parse_tap_and_trim(struct sdhci_host *host) > { > struct sdhci_pltfm_host *pltfm_host =3D sdhci_priv(host); > struct sdhci_tegra *tegra_host =3D sdhci_pltfm_priv(pltfm_host); > @@ -515,6 +520,11 @@ static void tegra_sdhci_parse_default_tap_and_trim(s= truct sdhci_host *host) > &tegra_host->default_trim); > if (err) > tegra_host->default_trim =3D 0; > + > + err =3D device_property_read_u32(host->mmc->parent, "nvidia,dqs-trim", > + &tegra_host->dqs_trim); > + if (err) > + tegra_host->dqs_trim =3D 0x11; Okay, so there's only one value. I think that should be clarified in the bindings documentation. It should mention that a single cell is used for this. Also, I assume there are lower and upper limits for the valid range of DQS trim values. Might make sense to specify those in the DT bindings as well. > } > =20 > static void tegra_sdhci_set_clock(struct sdhci_host *host, unsigned int = clock) > @@ -545,20 +555,33 @@ static unsigned int tegra_sdhci_get_max_clock(struc= t sdhci_host *host) > return clk_round_rate(pltfm_host->clk, UINT_MAX); > } > =20 > +static void tegra_sdhci_set_dqs_trim(struct sdhci_host *host, u8 val) > +{ > + u32 reg; > + > + reg =3D sdhci_readl(host, SDHCI_TEGRA_VENDOR_CAP_OVERRIDES); > + reg &=3D ~SDHCI_TEGRA_CAP_OVERRIDES_DQS_TRIM_MASK; > + reg |=3D val< + sdhci_writel(host, reg, SDHCI_TEGRA_VENDOR_CAP_OVERRIDES); > +} Nit: I dislike using "reg" as a variable representing a register value because I keep interpreting it as designating a register offset. Hence I tend to use more explicit "offset" for actual register offsets and "value" for register values. But maybe that's just me. 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