[PATCH v1 6/7] ufs: host: mediatek: support mphy reset

[Chun-Hung Wu (巫駿宏)]

On Fri, 2024-03-08 at 15:02 +0800, peter.wang at mediatek.com wrote:
> From: Peter Wang <peter.wang at mediatek.com>
> 
> This patch will reset mphy when host reset.
> Backup mphy setting after mphy reset control get.
> Restore mphy setting after mphy reset.
> 
> Signed-off-by: Peter Wang <peter.wang at mediatek.com>
> ---
>  drivers/ufs/host/ufs-mediatek-sip.h |  9 ++++++++-
>  drivers/ufs/host/ufs-mediatek.c     | 14 ++++++++++++++
>  drivers/ufs/host/ufs-mediatek.h     |  1 +
>  3 files changed, 23 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/ufs/host/ufs-mediatek-sip.h
> b/drivers/ufs/host/ufs-mediatek-sip.h
> index fd640846910a..64f48ecc54c7 100755
> --- a/drivers/ufs/host/ufs-mediatek-sip.h
> +++ b/drivers/ufs/host/ufs-mediatek-sip.h
> @@ -19,7 +19,7 @@
>  #define UFS_MTK_SIP_SRAM_PWR_CTRL         BIT(5)
>  #define UFS_MTK_SIP_GET_VCC_NUM           BIT(6)
>  #define UFS_MTK_SIP_DEVICE_PWR_CTRL       BIT(7)
> -
> +#define UFS_MTK_SIP_MPHY_CTRL             BIT(8)
>  
>  /*
>   * Multi-VCC by Numbering
> @@ -31,6 +31,10 @@ enum ufs_mtk_vcc_num {
>  	UFS_VCC_MAX
>  };
>  
> +enum ufs_mtk_mphy_op {
> +	UFS_MPHY_BACKUP = 0,
> +	UFS_MPHY_RESTORE
> +};
>  
>  /*
>   * SMC call wrapper function
> @@ -80,4 +84,7 @@ static inline void _ufs_mtk_smc(struct
> ufs_mtk_smc_arg s)
>  #define ufs_mtk_device_pwr_ctrl(on, ufs_version, res) \
>  	ufs_mtk_smc(UFS_MTK_SIP_DEVICE_PWR_CTRL, &(res), on,
> ufs_version)
>  
> +#define ufs_mtk_mphy_ctrl(op, res) \
> +	ufs_mtk_smc(UFS_MTK_SIP_MPHY_CTRL, &(res), op)
> +
>  #endif /* !_UFS_MEDIATEK_SIP_H */
> diff --git a/drivers/ufs/host/ufs-mediatek.c b/drivers/ufs/host/ufs-
> mediatek.c
> index 2caf0c1d4e17..c4aae031b694 100644
> --- a/drivers/ufs/host/ufs-mediatek.c
> +++ b/drivers/ufs/host/ufs-mediatek.c
> @@ -185,16 +185,23 @@ static void ufs_mtk_crypto_enable(struct
> ufs_hba *hba)
>  static void ufs_mtk_host_reset(struct ufs_hba *hba)
>  {
>  	struct ufs_mtk_host *host = ufshcd_get_variant(hba);
> +	struct arm_smccc_res res;
>  
>  	reset_control_assert(host->hci_reset);
>  	reset_control_assert(host->crypto_reset);
>  	reset_control_assert(host->unipro_reset);
> +	reset_control_assert(host->mphy_reset);
>  
>  	usleep_range(100, 110);
>  
>  	reset_control_deassert(host->unipro_reset);
>  	reset_control_deassert(host->crypto_reset);
>  	reset_control_deassert(host->hci_reset);
> +	reset_control_deassert(host->mphy_reset);
> +
> +	/* restore mphy setting aftre mphy reset */
> +	if (host->mphy_reset)
> +		ufs_mtk_mphy_ctrl(UFS_MPHY_RESTORE, res);
>  }
>  
>  static void ufs_mtk_init_reset_control(struct ufs_hba *hba,
> @@ -219,6 +226,8 @@ static void ufs_mtk_init_reset(struct ufs_hba
> *hba)
>  				   "unipro_rst");
>  	ufs_mtk_init_reset_control(hba, &host->crypto_reset,
>  				   "crypto_rst");
> +	ufs_mtk_init_reset_control(hba, &host->mphy_reset,
> +				   "mphy_rst");
>  }
>  
>  static int ufs_mtk_hce_enable_notify(struct ufs_hba *hba,
> @@ -918,6 +927,7 @@ static int ufs_mtk_init(struct ufs_hba *hba)
>  	struct device *dev = hba->dev;
>  	struct ufs_mtk_host *host;
>  	int err = 0;
> +	struct arm_smccc_res res;
>  
>  	host = devm_kzalloc(dev, sizeof(*host), GFP_KERNEL);
>  	if (!host) {
> @@ -946,6 +956,10 @@ static int ufs_mtk_init(struct ufs_hba *hba)
>  
>  	ufs_mtk_init_reset(hba);
>  
> +	/* backup mphy setting if mphy can reset */
> +	if (host->mphy_reset)
> +		ufs_mtk_mphy_ctrl(UFS_MPHY_BACKUP, res);
> +
>  	/* Enable runtime autosuspend */
>  	hba->caps |= UFSHCD_CAP_RPM_AUTOSUSPEND;
>  
> diff --git a/drivers/ufs/host/ufs-mediatek.h b/drivers/ufs/host/ufs-
> mediatek.h
> index 17be3f748fa0..6129ab59e5f5 100644
> --- a/drivers/ufs/host/ufs-mediatek.h
> +++ b/drivers/ufs/host/ufs-mediatek.h
> @@ -166,6 +166,7 @@ struct ufs_mtk_host {
>  	struct reset_control *hci_reset;
>  	struct reset_control *unipro_reset;
>  	struct reset_control *crypto_reset;
> +	struct reset_control *mphy_reset;
>  	struct ufs_hba *hba;
>  	struct ufs_mtk_crypt_cfg *crypt;
>  	struct ufs_mtk_clk mclk;
Acked-by: Chun-Hung Wu <Chun-Hung.Wu at mediatek.com>