RE: [PATCH v1 2/7] ufs: host: mediatek: tx skew fix

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> From: Peter Wang <peter.wang@xxxxxxxxxxxx>
> 
> Mediatek tx skew issue fix by check dts setting and vendor/model.
> Then set PA_TACTIVATE set 8
> 
> Signed-off-by: Peter Wang <peter.wang@xxxxxxxxxxxx>
> ---
>  drivers/ufs/host/ufs-mediatek.c | 21 +++++++++++++++++++++
> drivers/ufs/host/ufs-mediatek.h |  1 +
>  2 files changed, 22 insertions(+)
> 
> diff --git a/drivers/ufs/host/ufs-mediatek.c b/drivers/ufs/host/ufs-mediatek.c
> index 6fc6fa2ea5bd..0262e8994236 100644
> --- a/drivers/ufs/host/ufs-mediatek.c
> +++ b/drivers/ufs/host/ufs-mediatek.c
> @@ -119,6 +119,13 @@ static bool ufs_mtk_is_pmc_via_fastauto(struct
> ufs_hba *hba)
>         return !!(host->caps & UFS_MTK_CAP_PMC_VIA_FASTAUTO);  }
> 
> +static bool ufs_mtk_is_tx_skew_fix(struct ufs_hba *hba) {
> +       struct ufs_mtk_host *host = ufshcd_get_variant(hba);
> +
> +       return !!(host->caps & UFS_MTK_CAP_TX_SKEW_FIX); }
> +
>  static bool ufs_mtk_is_allow_vccqx_lpm(struct ufs_hba *hba)  {
>         struct ufs_mtk_host *host = ufshcd_get_variant(hba); @@ -630,6 +637,9
> @@ static void ufs_mtk_init_host_caps(struct ufs_hba *hba)
>         if (of_property_read_bool(np, "mediatek,ufs-pmc-via-fastauto"))
>                 host->caps |= UFS_MTK_CAP_PMC_VIA_FASTAUTO;
> 
> +       if (of_property_read_bool(np, "mediatek,ufs-tx-skew-fix"))
> +               host->caps |= UFS_MTK_CAP_TX_SKEW_FIX;
> +
>         dev_info(hba->dev, "caps: 0x%x", host->caps);  }
> 
> @@ -1423,6 +1433,17 @@ static int ufs_mtk_apply_dev_quirks(struct ufs_hba
> *hba)
>         if (mid == UFS_VENDOR_SAMSUNG) {
>                 ufshcd_dme_set(hba, UIC_ARG_MIB(PA_TACTIVATE), 6);
>                 ufshcd_dme_set(hba, UIC_ARG_MIB(PA_HIBERN8TIME), 10);
> +       } else if (mid == UFS_VENDOR_MICRON) {
Is this a quirk for micron? Why not implemented as a quirk?
And go for all this trouble setting it in the dt etc.

Thanks,
Avri

> +               /* Only for the host which have TX skew issue */
> +               if (ufs_mtk_is_tx_skew_fix(hba) &&
> +                       (STR_PRFX_EQUAL("MT128GBCAV2U31", dev_info->model) ||
> +                       STR_PRFX_EQUAL("MT256GBCAV4U31", dev_info->model) ||
> +                       STR_PRFX_EQUAL("MT512GBCAV8U31", dev_info->model) ||
> +                       STR_PRFX_EQUAL("MT256GBEAX4U40", dev_info->model) ||
> +                       STR_PRFX_EQUAL("MT512GAYAX4U40", dev_info->model) ||
> +                       STR_PRFX_EQUAL("MT001TAYAX8U40", dev_info->model))) {
> +                       ufshcd_dme_set(hba, UIC_ARG_MIB(PA_TACTIVATE), 8);
> +               }
>         }
> 
>         /*
> diff --git a/drivers/ufs/host/ufs-mediatek.h b/drivers/ufs/host/ufs-mediatek.h
> index 0720da2f1402..146c25080599 100644
> --- a/drivers/ufs/host/ufs-mediatek.h
> +++ b/drivers/ufs/host/ufs-mediatek.h
> @@ -142,6 +142,7 @@ enum ufs_mtk_host_caps {
>          */
>         UFS_MTK_CAP_ALLOW_VCCQX_LPM            = 1 << 5,
>         UFS_MTK_CAP_PMC_VIA_FASTAUTO           = 1 << 6,
> +       UFS_MTK_CAP_TX_SKEW_FIX                = 1 << 7,
>  };
> 
>  struct ufs_mtk_crypt_cfg {
> --
> 2.18.0






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