linux-kernel - Re: [PATCH 3/6] mmc: sdhci-of-dwcmshc: Add support for T-Head TH1520

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Message-ID: <ZRGckWotC4RYHLNZ@x1>
Date:   Mon, 25 Sep 2023 16:43:29 +0200
From:   Drew Fustini <dfustini@...libre.com>
To:     Adrian Hunter <adrian.hunter@...el.com>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Jisheng Zhang <jszhang@...nel.org>,
        Guo Ren <guoren@...nel.org>, Fu Wei <wefu@...hat.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Conor Dooley <conor@...nel.org>,
        Robert Nelson <robertcnelson@...gleboard.org>,
        Jason Kridner <jkridner@...gleboard.org>,
        Xi Ruoyao <xry111@...111.site>, Han Gao <gaohan@...as.ac.cn>,
        Icenowy Zheng <uwu@...nowy.me>, linux-mmc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org
Subject: Re: [PATCH 3/6] mmc: sdhci-of-dwcmshc: Add support for T-Head TH1520

On Mon, Sep 25, 2023 at 01:35:36PM +0300, Adrian Hunter wrote:
> On 22/09/23 04:49, Drew Fustini wrote:
> > Add support for the mmc controller in the T-Head TH1520 with the new
> > compatible "thead,th1520-dwcmshc". Implement custom sdhci_ops for
> > set_uhs_signaling, reset, voltage_switch, and platform_execute_tuning.
> > 
> > Signed-off-by: Drew Fustini <dfustini@...libre.com>
> > ---
> >  drivers/mmc/host/sdhci-of-dwcmshc.c | 456 ++++++++++++++++++++++++++++++++++++
> >  1 file changed, 456 insertions(+)
> > 
> > diff --git a/drivers/mmc/host/sdhci-of-dwcmshc.c b/drivers/mmc/host/sdhci-of-dwcmshc.c
> > index 3a3bae6948a8..7294bf1afb7d 100644
> > --- a/drivers/mmc/host/sdhci-of-dwcmshc.c
> > +++ b/drivers/mmc/host/sdhci-of-dwcmshc.c
> > @@ -35,6 +35,26 @@
> >  #define DWCMSHC_CARD_IS_EMMC		BIT(0)
> >  #define DWCMSHC_ENHANCED_STROBE		BIT(8)
> >  #define DWCMSHC_EMMC_ATCTRL		0x40
> > +/* Tuning and auto-tuning fields in AT_CTRL_R control register */
> > +#define AT_CTRL_AT_EN			0x1 /* autotuning is enabled */
> > +#define AT_CTRL_CI_SEL_SHIFT		0x1 /* bit 1 */
> > +#define AT_CTRL_CI_SEL			0x1 /* interval to drive center phase select */
> > +#define AT_CTRL_SWIN_TH_EN_SHIFT	0x2 /* bit 2 */
> > +#define AT_CTRL_SWIN_TH_EN		0x1 /* sampling window threshold enable */
> > +#define AT_CTRL_RPT_TUNE_ERR_SHIFT	0x3 /* bit 3 */
> > +#define AT_CTRL_RPT_TUNE_ERR		0x1 /* enable reporting framing errors */
> > +#define AT_CTRL_SW_TUNE_EN_SHIFT	0x4 /* bit 4 */
> > +#define AT_CTRL_SW_TUNE_EN		0x1 /* enable software managed tuning */
> > +#define AT_CTRL_WIN_EDGE_SEL_SHIFT	0x8 /* bits [11:8] */
> > +#define AT_CTRL_WIN_EDGE_SEL		0xf /* sampling window edge select */
> > +#define AT_CTRL_TUNE_CLK_STOP_EN_SHIFT	0x10 /* bit 16 */
> > +#define AT_CTRL_TUNE_CLK_STOP_EN	0x1  /* clocks stopped during phase code change */
> > +#define AT_CTRL_PRE_CHANGE_DLY_SHIFT	0x11 /* bits [18:17] */
> > +#define AT_CTRL_PRE_CHANGE_DLY		0x1  /* 2-cycle latency */
> > +#define AT_CTRL_POST_CHANGE_DLY_SHIFT	0x13 /* bits [20:19] */
> > +#define AT_CTRL_POST_CHANGE_DLY		0x3  /* 4-cycle latency */
> > +#define AT_CTRL_SWIN_TH_VAL_SHIFT	0x18 /* bits [31:24] */
> > +#define AT_CTRL_SWIN_TH_VAL		0x9  /* sampling window threshold */
> 
> Here and elsewhere, please try to make use of BIT(), GENMASK(),
> FIELD_PREP(), FIELD_GET()

Thank you for the advice.  FIELD_PREP() and FIELD_GET() look like they
can make the code simpler.  I'll make use of those macros in the next
version.

thanks,
drew