[PATCH v1 1/1] mmc: mediatek: add HS400 enhanced strobe support

[Ulf Hansson]

On Mon, 2 Nov 2020 at 10:29, Wenbin Mei <wenbin.mei at mediatek.com> wrote:
>
> Add support for HS400ES mode to MediaTek MMC Card Driver.
>
> Signed-off-by: Wenbin Mei <wenbin.mei at mediatek.com>

Applied for next, thanks!

Kind regards
Uffe


> ---
>  drivers/mmc/host/mtk-sd.c | 40 +++++++++++++++++++++++++++++++++++++++
>  1 file changed, 40 insertions(+)
>
> diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
> index f7f68623fefc..fc5ee5df91ad 100644
> --- a/drivers/mmc/host/mtk-sd.c
> +++ b/drivers/mmc/host/mtk-sd.c
> @@ -78,9 +78,12 @@
>  #define MSDC_PAD_TUNE0   0xf0
>  #define PAD_DS_TUNE      0x188
>  #define PAD_CMD_TUNE     0x18c
> +#define EMMC51_CFG0     0x204
>  #define EMMC50_CFG0      0x208
> +#define EMMC50_CFG1      0x20c
>  #define EMMC50_CFG3      0x220
>  #define SDC_FIFO_CFG     0x228
> +#define CQHCI_SETTING   0x7fc
>
>  /*--------------------------------------------------------------------------*/
>  /* Top Pad Register Offset                                                  */
> @@ -261,15 +264,26 @@
>
>  #define PAD_CMD_TUNE_RX_DLY3     (0x1f << 1)  /* RW */
>
> +/* EMMC51_CFG0 mask */
> +#define CMDQ_RDAT_CNT            (0x3ff << 12) /* RW */
> +
>  #define EMMC50_CFG_PADCMD_LATCHCK (0x1 << 0)   /* RW */
>  #define EMMC50_CFG_CRCSTS_EDGE    (0x1 << 3)   /* RW */
>  #define EMMC50_CFG_CFCSTS_SEL     (0x1 << 4)   /* RW */
> +#define EMMC50_CFG_CMD_RESP_SEL   (0x1 << 9)   /* RW */
> +
> +/* EMMC50_CFG1 mask */
> +#define EMMC50_CFG1_DS_CFG        (0x1 << 28)  /* RW */
>
>  #define EMMC50_CFG3_OUTS_WR       (0x1f << 0)  /* RW */
>
>  #define SDC_FIFO_CFG_WRVALIDSEL   (0x1 << 24)  /* RW */
>  #define SDC_FIFO_CFG_RDVALIDSEL   (0x1 << 25)  /* RW */
>
> +/* CQHCI_SETTING */
> +#define CQHCI_RD_CMD_WND_SEL     (0x1 << 14) /* RW */
> +#define CQHCI_WR_CMD_WND_SEL     (0x1 << 15) /* RW */
> +
>  /* EMMC_TOP_CONTROL mask */
>  #define PAD_RXDLY_SEL           (0x1 << 0)      /* RW */
>  #define DELAY_EN                (0x1 << 1)      /* RW */
> @@ -2276,6 +2290,31 @@ static int msdc_get_cd(struct mmc_host *mmc)
>                 return !val;
>  }
>
> +static void msdc_hs400_enhanced_strobe(struct mmc_host *mmc,
> +                                      struct mmc_ios *ios)
> +{
> +       struct msdc_host *host = mmc_priv(mmc);
> +
> +       if (ios->enhanced_strobe) {
> +               msdc_prepare_hs400_tuning(mmc, ios);
> +               sdr_set_field(host->base + EMMC50_CFG0, EMMC50_CFG_PADCMD_LATCHCK, 1);
> +               sdr_set_field(host->base + EMMC50_CFG0, EMMC50_CFG_CMD_RESP_SEL, 1);
> +               sdr_set_field(host->base + EMMC50_CFG1, EMMC50_CFG1_DS_CFG, 1);
> +
> +               sdr_clr_bits(host->base + CQHCI_SETTING, CQHCI_RD_CMD_WND_SEL);
> +               sdr_clr_bits(host->base + CQHCI_SETTING, CQHCI_WR_CMD_WND_SEL);
> +               sdr_clr_bits(host->base + EMMC51_CFG0, CMDQ_RDAT_CNT);
> +       } else {
> +               sdr_set_field(host->base + EMMC50_CFG0, EMMC50_CFG_PADCMD_LATCHCK, 0);
> +               sdr_set_field(host->base + EMMC50_CFG0, EMMC50_CFG_CMD_RESP_SEL, 0);
> +               sdr_set_field(host->base + EMMC50_CFG1, EMMC50_CFG1_DS_CFG, 0);
> +
> +               sdr_set_bits(host->base + CQHCI_SETTING, CQHCI_RD_CMD_WND_SEL);
> +               sdr_set_bits(host->base + CQHCI_SETTING, CQHCI_WR_CMD_WND_SEL);
> +               sdr_set_field(host->base + EMMC51_CFG0, CMDQ_RDAT_CNT, 0xb4);
> +       }
> +}
> +
>  static void msdc_cqe_enable(struct mmc_host *mmc)
>  {
>         struct msdc_host *host = mmc_priv(mmc);
> @@ -2333,6 +2372,7 @@ static const struct mmc_host_ops mt_msdc_ops = {
>         .set_ios = msdc_ops_set_ios,
>         .get_ro = mmc_gpio_get_ro,
>         .get_cd = msdc_get_cd,
> +       .hs400_enhanced_strobe = msdc_hs400_enhanced_strobe,
>         .enable_sdio_irq = msdc_enable_sdio_irq,
>         .ack_sdio_irq = msdc_ack_sdio_irq,
>         .start_signal_voltage_switch = msdc_ops_switch_volt,
> --
> 2.18.0