linux-kernel - Re: [PATCH V7 17/23] mmc: sdhci-uhs2: add uhs2

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Message-ID: <402b9e3e-7d30-bf80-1ebe-708821e55983@intel.com>
Date:   Wed, 12 Apr 2023 16:11:33 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Victor Shih <victorshihgli@...il.com>, ulf.hansson@...aro.org
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        benchuanggli@...il.com, HL.Liu@...esyslogic.com.tw,
        Greg.tu@...esyslogic.com.tw, takahiro.akashi@...aro.org,
        dlunev@...omium.org, Victor Shih <victor.shih@...esyslogic.com.tw>,
        Ben Chuang <ben.chuang@...esyslogic.com.tw>
Subject: Re: [PATCH V7 17/23] mmc: sdhci-uhs2: add uhs2_control() to
 initialise the interface

On 31/03/23 13:55, Victor Shih wrote:
> This is a sdhci version of mmc's uhs2_set_reg operation.
> UHS-II interface (related registers) will be initialised here.
> 
> Signed-off-by: Ben Chuang <ben.chuang@...esyslogic.com.tw>
> Signed-off-by: AKASHI Takahiro <takahiro.akashi@...aro.org>
> Signed-off-by: Victor Shih <victor.shih@...esyslogic.com.tw>
> ---
>  drivers/mmc/host/sdhci-uhs2.c | 89 +++++++++++++++++++++++++++++++++++
>  1 file changed, 89 insertions(+)
> 
> diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c
> index 71ac76065886..6fe394b1a7be 100644
> --- a/drivers/mmc/host/sdhci-uhs2.c
> +++ b/drivers/mmc/host/sdhci-uhs2.c
> @@ -278,6 +278,49 @@ 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 + 0);
> +	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);

Perhaps line these up and lose the parentheses.

	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)
> +{
> +	u32 val;
> +	/* 100ms */
> +	int timeout = 100000;
> +
> +	if (read_poll_timeout_atomic(sdhci_readl, val, (val & SDHCI_UHS2_IN_DORMANT_STATE),
> +				     100, timeout, true, host, SDHCI_PRESENT_STATE)) {

atomic not needed

> +		pr_warn("%s: UHS2 IN_DORMANT fail in 100ms.\n", mmc_hostname(host->mmc));
> +		sdhci_dumpregs(host);
> +		return -EIO;
> +	}
> +	return 0;
> +}
> +
>  /*****************************************************************************\
>   *                                                                           *
>   * MMC callbacks                                                             *
> @@ -360,6 +403,51 @@ static int sdhci_uhs2_enable_clk(struct mmc_host *mmc)
>  	return 0;
>  }
>  
> +static int sdhci_uhs2_do_detect_init(struct mmc_host *mmc);
> +
> +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                                                          *
> @@ -487,6 +575,7 @@ 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;
>  }