Re: [PATCH V12 17/23] mmc: sdhci-uhs2: add uhs2_control() to initialise the interface
From: Victor Shih
Date: Fri Nov 17 2023 - 05:50:48 EST
On Tue, Oct 3, 2023 at 7:20 PM Ulf Hansson <ulf.hansson@xxxxxxxxxx> wrote:
>
> On Fri, 15 Sept 2023 at 11:44, Victor Shih <victorshihgli@xxxxxxxxx> wrote:
> >
> > From: Victor Shih <victor.shih@xxxxxxxxxxxxxxxxxxx>
> >
> > This is a sdhci version of mmc's uhs2_set_reg operation.
> > UHS-II interface (related registers) will be initialised here.
>
> Please clarify this. It's not entirely easy to understand what goes on
> by reading the commit message above.
>
> Again, the similar comments as I provided for patch15 applies to
> $subject patch too.
>
Hi, Ulf
I will merge patch#15, patch#16 and patch#17 into one patch(patch#15)
for version 13.
Thanks, Victor Shih
> >
> > Signed-off-by: Ben Chuang <ben.chuang@xxxxxxxxxxxxxxxxxxx>
> > Signed-off-by: AKASHI Takahiro <takahiro.akashi@xxxxxxxxxx>
> > Signed-off-by: Victor Shih <victor.shih@xxxxxxxxxxxxxxxxxxx>
> > Acked-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
> > ---
> >
> > Updates in V8:
> > - Reorder the definitions and lose the parentheses in
> > sdhci_uhs2_set_config().
> > - read_poll_timeout() to instead of read_poll_timeout_atomic()
> > in sdhci_uhs2_check_dormant().
> >
> > Updates in V7:
> > - Remove unnecessary function.
> >
> > Updates in V6:
> > - Remove unnecessary function.
> > - Remove unnecessary parameter when call the DBG().
> > - Cancel export state of some functions.
> >
> > ---
> >
> > drivers/mmc/host/sdhci-uhs2.c | 88 +++++++++++++++++++++++++++++++++++
> > 1 file changed, 88 insertions(+)
> >
> > diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c
> > index af1b0c5e48fd..09b86fec9f7b 100644
> > --- a/drivers/mmc/host/sdhci-uhs2.c
> > +++ b/drivers/mmc/host/sdhci-uhs2.c
> > @@ -278,6 +278,48 @@ static void __sdhci_uhs2_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
> > sdhci_set_clock(host, host->clock);
> > }
> >
> > +static void sdhci_uhs2_set_config(struct sdhci_host *host)
> > +{
> > + u32 value;
> > + u16 sdhci_uhs2_set_ptr = sdhci_readw(host, SDHCI_UHS2_SETTINGS_PTR);
> > + u16 sdhci_uhs2_gen_set_reg = sdhci_uhs2_set_ptr;
> > + u16 sdhci_uhs2_phy_set_reg = sdhci_uhs2_set_ptr + 4;
> > + u16 sdhci_uhs2_tran_set_reg = sdhci_uhs2_set_ptr + 8;
> > + u16 sdhci_uhs2_tran_set_1_reg = sdhci_uhs2_set_ptr + 12;
> > +
> > + /* Set Gen Settings */
> > + value = FIELD_PREP(SDHCI_UHS2_GEN_SETTINGS_N_LANES_MASK, host->mmc->uhs2_caps.n_lanes_set);
> > + sdhci_writel(host, value, sdhci_uhs2_gen_set_reg);
> > +
> > + /* Set PHY Settings */
> > + value = FIELD_PREP(SDHCI_UHS2_PHY_N_LSS_DIR_MASK, host->mmc->uhs2_caps.n_lss_dir_set) |
> > + FIELD_PREP(SDHCI_UHS2_PHY_N_LSS_SYN_MASK, host->mmc->uhs2_caps.n_lss_sync_set);
> > + if (host->mmc->ios.timing == MMC_TIMING_UHS2_SPEED_B ||
> > + host->mmc->ios.timing == MMC_TIMING_UHS2_SPEED_B_HD)
> > + value |= SDHCI_UHS2_PHY_SET_SPEED_B;
> > + sdhci_writel(host, value, sdhci_uhs2_phy_set_reg);
> > +
> > + /* Set LINK-TRAN Settings */
> > + value = FIELD_PREP(SDHCI_UHS2_TRAN_RETRY_CNT_MASK, host->mmc->uhs2_caps.max_retry_set) |
> > + FIELD_PREP(SDHCI_UHS2_TRAN_N_FCU_MASK, host->mmc->uhs2_caps.n_fcu_set);
> > + sdhci_writel(host, value, sdhci_uhs2_tran_set_reg);
> > + sdhci_writel(host, host->mmc->uhs2_caps.n_data_gap_set, sdhci_uhs2_tran_set_1_reg);
> > +}
> > +
> > +static int sdhci_uhs2_check_dormant(struct sdhci_host *host)
> > +{
> > + int timeout = 100000; /* 100ms */
>
> Define.
>
Hi, Ulf
I will update this in version 13.
Thanks, Victor Shih
> > + u32 val;
> > +
> > + if (read_poll_timeout(sdhci_readl, val, (val & SDHCI_UHS2_IN_DORMANT_STATE),
> > + 100, timeout, true, host, SDHCI_PRESENT_STATE)) {
> > + pr_warn("%s: UHS2 IN_DORMANT fail in 100ms.\n", mmc_hostname(host->mmc));
> > + sdhci_dumpregs(host);
> > + return -EIO;
> > + }
> > + return 0;
> > +}
> > +
> > /*****************************************************************************\
> > * *
> > * MMC callbacks *
> > @@ -359,6 +401,51 @@ static int sdhci_uhs2_enable_clk(struct mmc_host *mmc)
> > return 0;
> > }
> >
> > +static int sdhci_uhs2_do_detect_init(struct mmc_host *mmc);
>
> Please re-order the code so this declaration isn't needed. And make it
> part of the patch that introduced the function, not in the $subject
> patch.
>
Hi, Ulf
I will update this in version 13.
Thanks, Victor Shih
> > +
> > +static int sdhci_uhs2_control(struct mmc_host *mmc, enum sd_uhs2_operation op)
> > +{
> > + struct sdhci_host *host = mmc_priv(mmc);
> > + struct mmc_ios *ios = &mmc->ios;
> > + int err = 0;
> > +
> > + DBG("Begin uhs2 control, act %d.\n", op);
> > +
> > + switch (op) {
> > + case UHS2_PHY_INIT:
> > + err = sdhci_uhs2_do_detect_init(mmc);
> > + break;
> > + case UHS2_SET_CONFIG:
> > + sdhci_uhs2_set_config(host);
> > + break;
> > + case UHS2_ENABLE_INT:
> > + sdhci_uhs2_clear_set_irqs(host, 0, SDHCI_INT_CARD_INT);
> > + break;
> > + case UHS2_DISABLE_INT:
> > + sdhci_uhs2_clear_set_irqs(host, SDHCI_INT_CARD_INT, 0);
> > + break;
> > + case UHS2_CHECK_DORMANT:
> > + err = sdhci_uhs2_check_dormant(host);
> > + break;
> > + case UHS2_DISABLE_CLK:
> > + err = sdhci_uhs2_disable_clk(mmc);
> > + break;
> > + case UHS2_ENABLE_CLK:
> > + err = sdhci_uhs2_enable_clk(mmc);
> > + break;
> > + case UHS2_SET_IOS:
> > + err = sdhci_uhs2_set_ios(mmc, ios);
> > + break;
> > + default:
> > + pr_err("%s: input sd uhs2 operation %d is wrong!\n",
> > + mmc_hostname(host->mmc), op);
> > + err = -EIO;
> > + break;
> > + }
> > +
> > + return err;
> > +}
> > +
> > /*****************************************************************************\
> > * *
> > * Driver init/exit *
> > @@ -481,6 +568,7 @@ static int sdhci_uhs2_host_ops_init(struct sdhci_host *host)
> > {
> > host->mmc_host_ops.start_signal_voltage_switch =
> > sdhci_uhs2_start_signal_voltage_switch;
> > + host->mmc_host_ops.uhs2_control = sdhci_uhs2_control;
> >
> > return 0;
> > }
>
> Kind regards
> Uffe