linux-kernel - Re: [PATCH v1 2/2] scsi: ufs: introduce common function to disable host TX LCC

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Message-ID: <fedd167b5cd8b5dcfc107b48c0770b6a@codeaurora.org>
Date:   Fri, 07 Feb 2020 19:10:14 +0800
From:   Can Guo <cang@...eaurora.org>
To:     Stanley Chu <stanley.chu@...iatek.com>
Cc:     linux-scsi@...r.kernel.org, martin.petersen@...cle.com,
        avri.altman@....com, alim.akhtar@...sung.com, jejb@...ux.ibm.com,
        beanhuo@...ron.com, asutoshd@...eaurora.org,
        matthias.bgg@...il.com, bvanassche@....org,
        linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kuohong.wang@...iatek.com, peter.wang@...iatek.com,
        chun-hung.wu@...iatek.com, andy.teng@...iatek.com
Subject: Re: [PATCH v1 2/2] scsi: ufs: introduce common function to disable
 host TX LCC

On 2020-02-07 15:03, Stanley Chu wrote:
> Many vendors would like to disable host TX LCC during initialization
> flow. Introduce a common function for all users to make drivers easier 
> to
> read and maintained. This patch does not change any functionality.
> 
> Signed-off-by: Stanley Chu <stanley.chu@...iatek.com>

Reviewed-by: Can Guo <cang@...eaurora.org>

> ---
>  drivers/scsi/ufs/cdns-pltfrm.c  | 2 +-
>  drivers/scsi/ufs/ufs-hisi.c     | 2 +-
>  drivers/scsi/ufs/ufs-mediatek.c | 2 +-
>  drivers/scsi/ufs/ufs-qcom.c     | 4 +---
>  drivers/scsi/ufs/ufshcd-pci.c   | 2 +-
>  drivers/scsi/ufs/ufshcd.h       | 5 +++++
>  6 files changed, 10 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/scsi/ufs/cdns-pltfrm.c 
> b/drivers/scsi/ufs/cdns-pltfrm.c
> index 56a6a1ed5ec2..da065a259f6e 100644
> --- a/drivers/scsi/ufs/cdns-pltfrm.c
> +++ b/drivers/scsi/ufs/cdns-pltfrm.c
> @@ -192,7 +192,7 @@ static int cdns_ufs_link_startup_notify(struct 
> ufs_hba *hba,
>  	 * and device TX LCC are disabled once link startup is
>  	 * completed.
>  	 */
> -	ufshcd_dme_set(hba, UIC_ARG_MIB(PA_LOCAL_TX_LCC_ENABLE), 0);
> +	ufshcd_disable_host_tx_lcc(hba);
> 
>  	/*
>  	 * Disabling Autohibern8 feature in cadence UFS
> diff --git a/drivers/scsi/ufs/ufs-hisi.c b/drivers/scsi/ufs/ufs-hisi.c
> index 5d6487350a6c..074a6a055a4c 100644
> --- a/drivers/scsi/ufs/ufs-hisi.c
> +++ b/drivers/scsi/ufs/ufs-hisi.c
> @@ -235,7 +235,7 @@ static int ufs_hisi_link_startup_pre_change(struct
> ufs_hba *hba)
>  	ufshcd_writel(hba, reg, REG_AUTO_HIBERNATE_IDLE_TIMER);
> 
>  	/* Unipro PA_Local_TX_LCC_Enable */
> -	ufshcd_dme_set(hba, UIC_ARG_MIB_SEL(0x155E, 0x0), 0x0);
> +	ufshcd_disable_host_tx_lcc(hba);
>  	/* close Unipro VS_Mk2ExtnSupport */
>  	ufshcd_dme_set(hba, UIC_ARG_MIB_SEL(0xD0AB, 0x0), 0x0);
>  	ufshcd_dme_get(hba, UIC_ARG_MIB_SEL(0xD0AB, 0x0), &value);
> diff --git a/drivers/scsi/ufs/ufs-mediatek.c 
> b/drivers/scsi/ufs/ufs-mediatek.c
> index 8f73c860f423..9d05962feb15 100644
> --- a/drivers/scsi/ufs/ufs-mediatek.c
> +++ b/drivers/scsi/ufs/ufs-mediatek.c
> @@ -318,7 +318,7 @@ static int ufs_mtk_pre_link(struct ufs_hba *hba)
>  	 * to make sure that both host and device TX LCC are disabled
>  	 * once link startup is completed.
>  	 */
> -	ret = ufshcd_dme_set(hba, UIC_ARG_MIB(PA_LOCAL_TX_LCC_ENABLE), 0);
> +	ret = ufshcd_disable_host_tx_lcc(hba);
>  	if (ret)
>  		return ret;
> 
> diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c
> index c69c29a1ceb9..c2e703d58f63 100644
> --- a/drivers/scsi/ufs/ufs-qcom.c
> +++ b/drivers/scsi/ufs/ufs-qcom.c
> @@ -554,9 +554,7 @@ static int ufs_qcom_link_startup_notify(struct 
> ufs_hba *hba,
>  		 * completed.
>  		 */
>  		if (ufshcd_get_local_unipro_ver(hba) != UFS_UNIPRO_VER_1_41)
> -			err = ufshcd_dme_set(hba,
> -					UIC_ARG_MIB(PA_LOCAL_TX_LCC_ENABLE),
> -					0);
> +			err = ufshcd_disable_host_tx_lcc(hba);
> 
>  		break;
>  	case POST_CHANGE:
> diff --git a/drivers/scsi/ufs/ufshcd-pci.c 
> b/drivers/scsi/ufs/ufshcd-pci.c
> index 3b19de3ae9a3..8f78a8151499 100644
> --- a/drivers/scsi/ufs/ufshcd-pci.c
> +++ b/drivers/scsi/ufs/ufshcd-pci.c
> @@ -44,7 +44,7 @@ static int ufs_intel_disable_lcc(struct ufs_hba *hba)
> 
>  	ufshcd_dme_get(hba, attr, &lcc_enable);
>  	if (lcc_enable)
> -		ufshcd_dme_set(hba, attr, 0);
> +		ufshcd_disable_host_tx_lcc(hba);
> 
>  	return 0;
>  }
> diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
> index 81c71a3e3474..8f516b205c32 100644
> --- a/drivers/scsi/ufs/ufshcd.h
> +++ b/drivers/scsi/ufs/ufshcd.h
> @@ -914,6 +914,11 @@ static inline bool ufshcd_is_hs_mode(struct
> ufs_pa_layer_attr *pwr_info)
>  		pwr_info->pwr_tx == FASTAUTO_MODE);
>  }
> 
> +static inline int ufshcd_disable_host_tx_lcc(struct ufs_hba *hba)
> +{
> +	return ufshcd_dme_set(hba, UIC_ARG_MIB(PA_LOCAL_TX_LCC_ENABLE), 0);
> +}
> +
>  /* Expose Query-Request API */
>  int ufshcd_query_descriptor_retry(struct ufs_hba *hba,
>  				  enum query_opcode opcode,