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Message-ID: <CAPDyKFoQY=y-aZQa3GBGayE6=Ei=hw_Nu=1_tmQ-ckv94ujf4A@mail.gmail.com>
Date: Tue, 3 Oct 2023 13:19:39 +0200
From: Ulf Hansson <ulf.hansson@...aro.org>
To: Victor Shih <victorshihgli@...il.com>
Cc: adrian.hunter@...el.com, 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,
Ben Chuang <ben.chuang@...esyslogic.com.tw>,
Victor Shih <victor.shih@...esyslogic.com.tw>
Subject: Re: [PATCH V12 17/23] mmc: sdhci-uhs2: add uhs2_control() to
initialise the interface
On Fri, 15 Sept 2023 at 11:44, Victor Shih <victorshihgli@...il.com> wrote:
>
> From: Victor Shih <victor.shih@...esyslogic.com.tw>
>
> 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.
>
> 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>
> Acked-by: Adrian Hunter <adrian.hunter@...el.com>
> ---
>
> 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.
> + 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.
> +
> +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
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