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Message-ID: <5feaa219-946a-cafd-a9f0-6ab344788f04@intel.com>
Date: Wed, 12 Apr 2023 16:11:01 +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 15/23] mmc: sdhci-uhs2: add detect_init() to detect the
interface
On 31/03/23 13:55, Victor Shih wrote:
> Sdhci_uhs2_do_detect_init() is a sdhci version of mmc's uhs2_detect_init
> operation. After detected, the host's UHS-II capabilities will be set up
> here and interrupts will also be enabled.
>
> 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 | 117 ++++++++++++++++++++++++++++++++++
> 1 file changed, 117 insertions(+)
>
> diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c
> index 9b519bd6d76e..e2972be1889f 100644
> --- a/drivers/mmc/host/sdhci-uhs2.c
> +++ b/drivers/mmc/host/sdhci-uhs2.c
> @@ -334,6 +334,123 @@ static int sdhci_uhs2_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
> * *
> \*****************************************************************************/
>
> +static int sdhci_uhs2_interface_detect(struct sdhci_host *host)
> +{
> + /* 100ms */
> + int timeout = 100000;
> + u32 val;
> +
> + udelay(200); /* wait for 200us before check */
There does not seem to be any need for this function
to be atomic, so this should use usleep_range() not udelay().
> +
> + if (read_poll_timeout_atomic(sdhci_readl, val, (val & SDHCI_UHS2_IF_DETECT),
> + 100, timeout, true, host, SDHCI_PRESENT_STATE)) {
Does not need to be atomic
> + pr_warn("%s: not detect UHS2 interface in 200us.\n", mmc_hostname(host->mmc));
> + sdhci_dumpregs(host);
> + return -EIO;
> + }
> +
> + /* Enable UHS2 error interrupts */
> + sdhci_uhs2_clear_set_irqs(host, SDHCI_INT_ALL_MASK, SDHCI_UHS2_INT_ERROR_MASK);
> +
> + /* 150ms */
> + timeout = 150000;
> + if (read_poll_timeout_atomic(sdhci_readl, val, (val & SDHCI_UHS2_LANE_SYNC),
Does not need to be atomic
> + 100, timeout, true, host, SDHCI_PRESENT_STATE)) {
> + pr_warn("%s: UHS2 Lane sync fail in 150ms.\n", mmc_hostname(host->mmc));
> + sdhci_dumpregs(host);
> + return -EIO;
> + }
> +
> + DBG("%s: UHS2 Lane synchronized in UHS2 mode, PHY is initialized.\n",
> + mmc_hostname(host->mmc));
> + return 0;
> +}
> +
> +static int sdhci_uhs2_init(struct sdhci_host *host)
> +{
> + u16 caps_ptr = 0;
> + u32 caps_gen = 0;
> + u32 caps_phy = 0;
> + u32 caps_tran[2] = {0, 0};
> + struct mmc_host *mmc = host->mmc;
> +
> + caps_ptr = sdhci_readw(host, SDHCI_UHS2_CAPS_PTR);
> + if (caps_ptr < 0x100 || caps_ptr > 0x1FF) {
> + pr_err("%s: SDHCI_UHS2_CAPS_PTR(%d) is wrong.\n",
> + mmc_hostname(mmc), caps_ptr);
> + return -ENODEV;
> + }
> + caps_gen = sdhci_readl(host, caps_ptr + SDHCI_UHS2_CAPS_OFFSET);
> + caps_phy = sdhci_readl(host, caps_ptr + SDHCI_UHS2_CAPS_PHY_OFFSET);
> + caps_tran[0] = sdhci_readl(host, caps_ptr + SDHCI_UHS2_CAPS_TRAN_OFFSET);
> + caps_tran[1] = sdhci_readl(host, caps_ptr + SDHCI_UHS2_CAPS_TRAN_1_OFFSET);
> +
> + /* General Caps */
> + mmc->uhs2_caps.dap = caps_gen & SDHCI_UHS2_CAPS_DAP_MASK;
> + mmc->uhs2_caps.gap = FIELD_GET(SDHCI_UHS2_CAPS_GAP_MASK, caps_gen);
> + mmc->uhs2_caps.n_lanes = FIELD_GET(SDHCI_UHS2_CAPS_LANE_MASK, caps_gen);
> + mmc->uhs2_caps.addr64 = (caps_gen & SDHCI_UHS2_CAPS_ADDR_64) ? 1 : 0;
> + mmc->uhs2_caps.card_type = FIELD_GET(SDHCI_UHS2_CAPS_DEV_TYPE_MASK, caps_gen);
> +
> + /* PHY Caps */
> + mmc->uhs2_caps.phy_rev = caps_phy & SDHCI_UHS2_CAPS_PHY_REV_MASK;
> + mmc->uhs2_caps.speed_range = FIELD_GET(SDHCI_UHS2_CAPS_PHY_RANGE_MASK, caps_phy);
> + mmc->uhs2_caps.n_lss_sync = FIELD_GET(SDHCI_UHS2_CAPS_PHY_N_LSS_SYN_MASK, caps_phy);
> + mmc->uhs2_caps.n_lss_dir = FIELD_GET(SDHCI_UHS2_CAPS_PHY_N_LSS_DIR_MASK, caps_phy);
> + if (mmc->uhs2_caps.n_lss_sync == 0)
> + mmc->uhs2_caps.n_lss_sync = 16 << 2;
> + else
> + mmc->uhs2_caps.n_lss_sync <<= 2;
> + if (mmc->uhs2_caps.n_lss_dir == 0)
> + mmc->uhs2_caps.n_lss_dir = 16 << 3;
> + else
> + mmc->uhs2_caps.n_lss_dir <<= 3;
> +
> + /* LINK/TRAN Caps */
> + mmc->uhs2_caps.link_rev = caps_tran[0] & SDHCI_UHS2_CAPS_TRAN_LINK_REV_MASK;
> + mmc->uhs2_caps.n_fcu = FIELD_GET(SDHCI_UHS2_CAPS_TRAN_N_FCU_MASK, caps_tran[0]);
> + if (mmc->uhs2_caps.n_fcu == 0)
> + mmc->uhs2_caps.n_fcu = 256;
> + mmc->uhs2_caps.host_type = FIELD_GET(SDHCI_UHS2_CAPS_TRAN_HOST_TYPE_MASK, caps_tran[0]);
> + mmc->uhs2_caps.maxblk_len = FIELD_GET(SDHCI_UHS2_CAPS_TRAN_BLK_LEN_MASK, caps_tran[0]);
> + mmc->uhs2_caps.n_data_gap = caps_tran[1] & SDHCI_UHS2_CAPS_TRAN_1_N_DATA_GAP_MASK;
> +
> + return 0;
> +}
> +
> +static int sdhci_uhs2_do_detect_init(struct mmc_host *mmc)
> +{
> + struct sdhci_host *host = mmc_priv(mmc);
> + int ret = -EIO;
> +
> + DBG("Begin do uhs2 detect init.\n");
> +
> + if (sdhci_uhs2_interface_detect(host)) {
> + pr_warn("%s: cannot detect UHS2 interface.\n",
> + mmc_hostname(host->mmc));
> + goto out;
Might as well be
return -EIO;
> + }
> +
> + if (sdhci_uhs2_init(host)) {
> + pr_warn("%s: UHS2 init fail.\n", mmc_hostname(host->mmc));
> + goto out;
Might as well be
return -EIO;
> + }
> +
> + /* Init complete, do soft reset and enable UHS2 error irqs. */
> + sdhci_uhs2_reset(host, SDHCI_UHS2_SW_RESET_SD);
> + sdhci_uhs2_clear_set_irqs(host, SDHCI_INT_ALL_MASK, SDHCI_UHS2_INT_ERROR_MASK);
> + /*
> + * N.B SDHCI_INT_ENABLE and SDHCI_SIGNAL_ENABLE was cleared
> + * by SDHCI_UHS2_SW_RESET_SD
> + */
> + sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
> + sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
> +
> + ret = 0;
> +out:
> + return ret;
Might as well be
return 0;
so "out:" and ret not needed.
> +}
> +
> static int sdhci_uhs2_host_ops_init(struct sdhci_host *host)
> {
> host->mmc_host_ops.start_signal_voltage_switch =
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