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

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Date:   Fri, 7 Feb 2020 10:14:40 -0800
From:   "Asutosh Das (asd)" <asutoshd@...eaurora.org>
To:     Stanley Chu <stanley.chu@...iatek.com>, linux-scsi@...r.kernel.org,
        martin.petersen@...cle.com, avri.altman@....com,
        alim.akhtar@...sung.com, jejb@...ux.ibm.com, beanhuo@...ron.com
Cc:     cang@...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 2/6/2020 11:03 PM, 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: Asutosh Das <asutoshd@...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,
> 


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