linux-kernel - Re: [PATCH v2] ufs: mcq: Adding a function for MCQ enable

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Message-ID: <20231227063038.GJ2814@thinkpad>
Date: Wed, 27 Dec 2023 12:00:38 +0530
From: Manivannan Sadhasivam <mani@...nel.org>
To: Chanwoo Lee <cw9316.lee@...sung.com>
Cc: alim.akhtar@...sung.com, avri.altman@....com, bvanassche@....org,
	jejb@...ux.ibm.com, martin.petersen@...cle.com,
	peter.wang@...iatek.com, chu.stanley@...il.com,
	matthias.bgg@...il.com, angelogioacchino.delregno@...labora.com,
	stanley.chu@...iatek.com, quic_cang@...cinc.com,
	quic_asutoshd@...cinc.com, powen.kao@...iatek.com,
	quic_nguyenb@...cinc.com, yang.lee@...ux.alibaba.com,
	beanhuo@...ron.com, Arthur.Simchaev@....com, ebiggers@...gle.com,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mediatek@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org, grant.jung@...sung.com,
	jt77.jang@...sung.com, dh0421.hwang@...sung.com,
	sh043.lee@...sung.com
Subject: Re: [PATCH v2] ufs: mcq: Adding a function for MCQ enable

On Thu, Dec 21, 2023 at 03:56:08PM +0900, Chanwoo Lee wrote:
> From: ChanWoo Lee <cw9316.lee@...sung.com>
> 
> The REG_UFS_MEM_CFG register is too general(broad)
> and it is difficult to know the meaning only with a value of 0x1.
> So far, comments were required.
> 
> Therefore, I have added new functions and defines
> to improve code readability/reusability.
> 
> Signed-off-by: ChanWoo Lee <cw9316.lee@...sung.com>

I would reword the subject and description as below:

```
ufs: mcq: Add definition for REG_UFS_MEM_CFG register

Instead of hardcoding the register field, add the proper definition. While
at it, let's also use ufshcd_rmwl() to simplify updating this register.
```

- Mani
> 
> * v1->v2:
>    1) Excluding ESI_ENABLE
>    2) Replace with ufshcd_rmwl, BIT()
>    3) Separating hba->mcq_enabled
> ---
>  drivers/ufs/core/ufs-mcq.c      | 6 ++++++
>  drivers/ufs/core/ufshcd.c       | 4 +---
>  drivers/ufs/host/ufs-mediatek.c | 4 +---
>  include/ufs/ufshcd.h            | 1 +
>  include/ufs/ufshci.h            | 3 +++
>  5 files changed, 12 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/ufs/core/ufs-mcq.c b/drivers/ufs/core/ufs-mcq.c
> index 0787456c2b89..edc752e55878 100644
> --- a/drivers/ufs/core/ufs-mcq.c
> +++ b/drivers/ufs/core/ufs-mcq.c
> @@ -399,6 +399,12 @@ void ufshcd_mcq_enable_esi(struct ufs_hba *hba)
>  }
>  EXPORT_SYMBOL_GPL(ufshcd_mcq_enable_esi);
>  
> +void ufshcd_mcq_enable(struct ufs_hba *hba)
> +{
> +	ufshcd_rmwl(hba, MCQ_MODE_SELECT, MCQ_MODE_SELECT, REG_UFS_MEM_CFG);
> +}
> +EXPORT_SYMBOL_GPL(ufshcd_mcq_enable);
> +
>  void ufshcd_mcq_config_esi(struct ufs_hba *hba, struct msi_msg *msg)
>  {
>  	ufshcd_writel(hba, msg->address_lo, REG_UFS_ESILBA);
> diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
> index ae9936fc6ffb..30df6f6a72c6 100644
> --- a/drivers/ufs/core/ufshcd.c
> +++ b/drivers/ufs/core/ufshcd.c
> @@ -8723,9 +8723,7 @@ static void ufshcd_config_mcq(struct ufs_hba *hba)
>  	hba->host->can_queue = hba->nutrs - UFSHCD_NUM_RESERVED;
>  	hba->reserved_slot = hba->nutrs - UFSHCD_NUM_RESERVED;
>  
> -	/* Select MCQ mode */
> -	ufshcd_writel(hba, ufshcd_readl(hba, REG_UFS_MEM_CFG) | 0x1,
> -		      REG_UFS_MEM_CFG);
> +	ufshcd_mcq_enable(hba);
>  	hba->mcq_enabled = true;
>  
>  	dev_info(hba->dev, "MCQ configured, nr_queues=%d, io_queues=%d, read_queue=%d, poll_queues=%d, queue_depth=%d\n",
> diff --git a/drivers/ufs/host/ufs-mediatek.c b/drivers/ufs/host/ufs-mediatek.c
> index fc61790d289b..1048add66419 100644
> --- a/drivers/ufs/host/ufs-mediatek.c
> +++ b/drivers/ufs/host/ufs-mediatek.c
> @@ -1219,9 +1219,7 @@ static int ufs_mtk_link_set_hpm(struct ufs_hba *hba)
>  		ufs_mtk_config_mcq(hba, false);
>  		ufshcd_mcq_make_queues_operational(hba);
>  		ufshcd_mcq_config_mac(hba, hba->nutrs);
> -		/* Enable MCQ mode */
> -		ufshcd_writel(hba, ufshcd_readl(hba, REG_UFS_MEM_CFG) | 0x1,
> -			      REG_UFS_MEM_CFG);
> +		ufshcd_mcq_enable(hba);
>  	}
>  
>  	if (err)
> diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
> index d862c8ddce03..a96c45fa4b4b 100644
> --- a/include/ufs/ufshcd.h
> +++ b/include/ufs/ufshcd.h
> @@ -1257,6 +1257,7 @@ unsigned long ufshcd_mcq_poll_cqe_lock(struct ufs_hba *hba,
>  					 struct ufs_hw_queue *hwq);
>  void ufshcd_mcq_make_queues_operational(struct ufs_hba *hba);
>  void ufshcd_mcq_enable_esi(struct ufs_hba *hba);
> +void ufshcd_mcq_enable(struct ufs_hba *hba);
>  void ufshcd_mcq_config_esi(struct ufs_hba *hba, struct msi_msg *msg);
>  
>  int ufshcd_opp_config_clks(struct device *dev, struct opp_table *opp_table,
> diff --git a/include/ufs/ufshci.h b/include/ufs/ufshci.h
> index d5accacae6bc..2a6989a70671 100644
> --- a/include/ufs/ufshci.h
> +++ b/include/ufs/ufshci.h
> @@ -282,6 +282,9 @@ enum {
>  /* UTMRLRSR - UTP Task Management Request Run-Stop Register 80h */
>  #define UTP_TASK_REQ_LIST_RUN_STOP_BIT		0x1
>  
> +/* REG_UFS_MEM_CFG - Global Config Registers 300h */
> +#define MCQ_MODE_SELECT 	BIT(0)
> +
>  /* CQISy - CQ y Interrupt Status Register  */
>  #define UFSHCD_MCQ_CQIS_TAIL_ENT_PUSH_STS	0x1
>  
> -- 
> 2.29.0
> 

-- 
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