linux-kernel - Re: [PATCH V5 2/6] scsi: ufs: qcom: Configure PA_VS_CORE_CLK_40NS

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Message-ID: <20230828074023.GC5148@thinkpad>
Date:   Mon, 28 Aug 2023 13:10:23 +0530
From:   Manivannan Sadhasivam <mani@...nel.org>
To:     Nitin Rawat <quic_nitirawa@...cinc.com>
Cc:     agross@...nel.org, andersson@...nel.org, konrad.dybcio@...aro.org,
        jejb@...ux.ibm.com, martin.petersen@...cle.com,
        quic_cang@...cinc.com, quic_nguyenb@...cinc.com,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org,
        Naveen Kumar Goud Arepalli <quic_narepall@...cinc.com>
Subject: Re: [PATCH V5 2/6] scsi: ufs: qcom: Configure
 PA_VS_CORE_CLK_40NS_CYCLES for Unipro core clk

On Wed, Aug 23, 2023 at 09:14:09PM +0530, Nitin Rawat wrote:
> For Qualcomm UFS controller V4.0 and above PA_VS_CORE_CLK_40NS_CYCLES
> attribute needs to be programmed with frequency of unipro core clk.
> Hence Configure PA_VS_CORE_CLK_40NS_CYCLES attribute for Unipro core clk.
> 

Same comment applies as patch 1.

- Mani

> Co-developed-by: Naveen Kumar Goud Arepalli <quic_narepall@...cinc.com>
> Signed-off-by: Naveen Kumar Goud Arepalli <quic_narepall@...cinc.com>
> Signed-off-by: Nitin Rawat <quic_nitirawa@...cinc.com>
> ---
>  drivers/ufs/host/ufs-qcom.c | 45 ++++++++++++++++++++++++++++---------
>  drivers/ufs/host/ufs-qcom.h |  2 ++
>  2 files changed, 37 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
> index 1108b0cd43b3..abc0e7f7d1b0 100644
> --- a/drivers/ufs/host/ufs-qcom.c
> +++ b/drivers/ufs/host/ufs-qcom.c
> @@ -93,8 +93,9 @@ static const struct __ufs_qcom_bw_table {
>  static struct ufs_qcom_host *ufs_qcom_hosts[MAX_UFS_QCOM_HOSTS];
> 
>  static void ufs_qcom_get_default_testbus_cfg(struct ufs_qcom_host *host);
> -static int ufs_qcom_set_dme_vs_core_clk_ctrl_clear_div(struct ufs_hba *hba,
> -						       u32 clk_cycles);
> +static int ufs_qcom_set_core_clk_ctrl(struct ufs_hba *hba,
> +					u32 clk_cycles,
> +					u32 clk_40ns_cycles);
> 
>  static struct ufs_qcom_host *rcdev_to_ufs_host(struct reset_controller_dev *rcd)
>  {
> @@ -690,8 +691,7 @@ static int ufs_qcom_link_startup_notify(struct ufs_hba *hba,
>  			 * set unipro core clock cycles to 150 & clear clock
>  			 * divider
>  			 */
> -			err = ufs_qcom_set_dme_vs_core_clk_ctrl_clear_div(hba,
> -									  150);
> +			err = ufs_qcom_set_core_clk_ctrl(hba, 150, 6);
> 
>  		/*
>  		 * Some UFS devices (and may be host) have issues if LCC is
> @@ -1296,12 +1296,13 @@ static void ufs_qcom_exit(struct ufs_hba *hba)
>  	phy_exit(host->generic_phy);
>  }
> 
> -static int ufs_qcom_set_dme_vs_core_clk_ctrl_clear_div(struct ufs_hba *hba,
> -						       u32 clk_1us_cycles)
> +static int ufs_qcom_set_core_clk_ctrl(struct ufs_hba *hba,
> +					u32 clk_1us_cycles,
> +					u32 clk_40ns_cycles)
>  {
>  	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
>  	u32 mask = DME_VS_CORE_CLK_CTRL_MAX_CORE_CLK_1US_CYCLES_MASK;
> -	u32 core_clk_ctrl_reg;
> +	u32 core_clk_ctrl_reg, reg;
>  	u32 offset = 0;
>  	int err;
> 
> @@ -1326,9 +1327,33 @@ static int ufs_qcom_set_dme_vs_core_clk_ctrl_clear_div(struct ufs_hba *hba,
>  	/* Clear CORE_CLK_DIV_EN */
>  	core_clk_ctrl_reg &= ~DME_VS_CORE_CLK_CTRL_CORE_CLK_DIV_EN_BIT;
> 
> -	return ufshcd_dme_set(hba,
> +	err = ufshcd_dme_set(hba,
>  			    UIC_ARG_MIB(DME_VS_CORE_CLK_CTRL),
>  			    core_clk_ctrl_reg);
> +	/*
> +	 * UFS host controller V4.0.0 onwards needs to program
> +	 * PA_VS_CORE_CLK_40NS_CYCLES attribute per programmed
> +	 * frequency of unipro core clk of UFS host controller.
> +	 */
> +	if (!err && (host->hw_ver.major >= 4)) {
> +		if (clk_40ns_cycles > PA_VS_CORE_CLK_40NS_CYCLES_MASK)
> +			return -EINVAL;
> +
> +		err = ufshcd_dme_get(hba,
> +				     UIC_ARG_MIB(PA_VS_CORE_CLK_40NS_CYCLES),
> +				     &reg);
> +		if (err)
> +			return err;
> +
> +		reg &= ~PA_VS_CORE_CLK_40NS_CYCLES_MASK;
> +		reg |= clk_40ns_cycles;
> +
> +		err = ufshcd_dme_set(hba,
> +				     UIC_ARG_MIB(PA_VS_CORE_CLK_40NS_CYCLES),
> +				     reg);
> +	}
> +
> +	return err;
>  }
> 
>  static int ufs_qcom_clk_scale_up_pre_change(struct ufs_hba *hba)
> @@ -1345,7 +1370,7 @@ static int ufs_qcom_clk_scale_up_post_change(struct ufs_hba *hba)
>  		return 0;
> 
>  	/* set unipro core clock cycles to 150 and clear clock divider */
> -	return ufs_qcom_set_dme_vs_core_clk_ctrl_clear_div(hba, 150);
> +	return ufs_qcom_set_core_clk_ctrl(hba, 150, 6);
>  }
> 
>  static int ufs_qcom_clk_scale_down_pre_change(struct ufs_hba *hba)
> @@ -1381,7 +1406,7 @@ static int ufs_qcom_clk_scale_down_post_change(struct ufs_hba *hba)
>  		return 0;
> 
>  	/* set unipro core clock cycles to 75 and clear clock divider */
> -	return ufs_qcom_set_dme_vs_core_clk_ctrl_clear_div(hba, 75);
> +	return ufs_qcom_set_core_clk_ctrl(hba, 75, 3);
>  }
> 
>  static int ufs_qcom_clk_scale_notify(struct ufs_hba *hba,
> diff --git a/drivers/ufs/host/ufs-qcom.h b/drivers/ufs/host/ufs-qcom.h
> index a829296e11bb..325f08aca260 100644
> --- a/drivers/ufs/host/ufs-qcom.h
> +++ b/drivers/ufs/host/ufs-qcom.h
> @@ -133,6 +133,8 @@ enum {
>  #define MAX_CORE_CLK_1US_CYCLES_OFFSET_V4	0x10
>  #define DME_VS_CORE_CLK_CTRL_CORE_CLK_DIV_EN_BIT		BIT(8)
>  #define DME_VS_CORE_CLK_CTRL_MAX_CORE_CLK_1US_CYCLES_MASK	0xFF
> +#define PA_VS_CORE_CLK_40NS_CYCLES	0x9007
> +#define PA_VS_CORE_CLK_40NS_CYCLES_MASK	0x3F
> 
>  static inline void
>  ufs_qcom_get_controller_revision(struct ufs_hba *hba,
> --
> 2.17.1
> 

-- 
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