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SubjectRe: [RFC PATCH V3 11/21] mmc: sdhci: UHS-II support, export host operations to core
On Fri, Aug 21, 2020 at 05:05:44PM +0300, Adrian Hunter wrote:
> On 10/07/20 2:10 pm, Ben Chuang wrote:
> > From: AKASHI Takahiro <takahiro.akashi@linaro.org>
> >
> > Export sdhci-specific UHS-II operations to core.
> >
> > Signed-off-by: Ben Chuang <ben.chuang@genesyslogic.com.tw>
> > Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
> > ---
> > drivers/mmc/host/sdhci.c | 70 ++++++++++++++++++++++++++++++++++++++++
> > 1 file changed, 70 insertions(+)
> >
> > diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> > index c2f6923d296c..aaf41954511a 100644
> > --- a/drivers/mmc/host/sdhci.c
> > +++ b/drivers/mmc/host/sdhci.c
> > @@ -2977,6 +2977,70 @@ static void sdhci_card_event(struct mmc_host *mmc)
> > spin_unlock_irqrestore(&host->lock, flags);
> > }
> >
> > +#if IS_ENABLED(CONFIG_MMC_SDHCI_UHS2)
> > +static int sdhci_uhs2_detect_init(struct mmc_host *mmc)
> > +{
> > + struct sdhci_host *host = mmc_priv(mmc);
> > + int ret;
> > +
> > + if (sdhci_uhs2_ops.do_detect_init)
> > + ret = sdhci_uhs2_ops.do_detect_init(host);
> > + else
> > + return 0;
> > +
> > + return ret;
> > +}
> > +
> > +static int sdhci_uhs2_set_reg(struct mmc_host *mmc, enum uhs2_act act)
> > +{
> > + struct sdhci_host *host = mmc_priv(mmc);
> > + int ret;
> > +
> > + if (sdhci_uhs2_ops.do_set_reg)
> > + ret = sdhci_uhs2_ops.do_set_reg(host, act);
> > + else
> > + ret = 0;
> > +
> > + return ret;
> > +}
> > +
> > +static void sdhci_uhs2_disable_clk(struct mmc_host *mmc)
> > +{
> > + struct sdhci_host *host = mmc_priv(mmc);
> > + u16 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
> > +
> > + clk &= ~SDHCI_CLOCK_CARD_EN;
> > + sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
> > +}
> > +
> > +static void sdhci_uhs2_enable_clk(struct mmc_host *mmc)
> > +{
> > + struct sdhci_host *host = mmc_priv(mmc);
> > + u16 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
> > + ktime_t timeout;
> > +
> > + clk |= SDHCI_CLOCK_CARD_EN;
> > + sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
> > +
> > + /* Wait max 20 ms */
> > + timeout = ktime_add_ms(ktime_get(), 20);
> > + while (1) {
> > + bool timedout = ktime_after(ktime_get(), timeout);
> > +
> > + clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
> > + if (clk & SDHCI_CLOCK_INT_STABLE)
> > + break;
> > + if (timedout) {
> > + pr_err("%s: Internal clock never stabilised.\n",
> > + mmc_hostname(host->mmc));
> > + sdhci_dumpregs(host);
> > + return;
> > + }
> > + udelay(10);
> > + }
> > +}
> > +#endif /* CONFIG_MMC_SDHCI_UHS2 */
>
> Please put all uhs2 functions in sdhci-uhs2.c and call them through sdhci_ops.

Okay although the logic itself in sdhci_uhs2_[enable|disable]_clk()
doesn't seem to be UHS-II specific.

-Takahiro Akashi

>
> > +
> > static const struct mmc_host_ops sdhci_ops = {
> > .request = sdhci_request,
> > .post_req = sdhci_post_req,
> > @@ -2992,6 +3056,12 @@ static const struct mmc_host_ops sdhci_ops = {
> > .execute_tuning = sdhci_execute_tuning,
> > .card_event = sdhci_card_event,
> > .card_busy = sdhci_card_busy,
> > +#if IS_ENABLED(CONFIG_MMC_SDHCI_UHS2)
> > + .uhs2_detect_init = sdhci_uhs2_detect_init,
> > + .uhs2_set_reg = sdhci_uhs2_set_reg,
> > + .uhs2_disable_clk = sdhci_uhs2_disable_clk,
> > + .uhs2_enable_clk = sdhci_uhs2_enable_clk,
> > +#endif /* CONFIG_MMC_SDHCI_UHS2 */
> > };
> >
> > /*****************************************************************************\
> >
>

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