linux-kernel - Re: [PATCH v2 5/7] scsi: ufs: ufs-qcom: Set initial PHY gear to max HS gear for HW ver 5 and newer

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Date:   Wed, 8 Nov 2023 11:04:15 +0530
From:   Manivannan Sadhasivam <mani@...nel.org>
To:     Can Guo <cang@....qualcomm.com>
Cc:     quic_cang@...cinc.com, bvanassche@....org,
        stanley.chu@...iatek.com, adrian.hunter@...el.com,
        beanhuo@...ron.com, avri.altman@....com, junwoo80.lee@...sung.com,
        martin.petersen@...cle.com, linux-scsi@...r.kernel.org,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "open list:UNIVERSAL FLASH STORAGE HOST CONTROLLER DRIVER..." 
        <linux-arm-msm@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 5/7] scsi: ufs: ufs-qcom: Set initial PHY gear to max
 HS gear for HW ver 5 and newer

On Mon, Nov 06, 2023 at 08:46:11PM -0800, Can Guo wrote:
> From: Can Guo <quic_cang@...cinc.com>
> 
> Set the initial PHY gear to max HS gear for hosts with HW ver 5 and newer.
> 

How about,

"For UFSHC >= 5.0, set the initial PHY gear based on the gear value returned by
ufs_qcom_get_hs_gear(). For the rest, use the existing default value of G2."

> This patch is not changing any functionalities or logic but only a
> preparation patch for the next patch in this series.
> 

You are also moving the default phy_gear code to ufs_qcom_set_host_params(). So
it should be mentioned in the commit message.

> Signed-off-by: Can Guo <quic_cang@...cinc.com>
> ---
>  drivers/ufs/host/ufs-qcom.c | 14 ++++++++------
>  1 file changed, 8 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
> index 55ee31d..94d34b5 100644
> --- a/drivers/ufs/host/ufs-qcom.c
> +++ b/drivers/ufs/host/ufs-qcom.c
> @@ -1069,6 +1069,14 @@ static void ufs_qcom_set_host_params(struct ufs_hba *hba)
>  
>  	/* This driver only supports symmetic gear setting i.e., hs_tx_gear == hs_rx_gear */
>  	host_params->hs_tx_gear = host_params->hs_rx_gear = ufs_qcom_get_hs_gear(hba);
> +	host->phy_gear = host_params->hs_tx_gear;
> +
> +	/*
> +	 * Power up the PHY using the minimum supported gear (UFS_HS_G2).
> +	 * Switching to max gear will be performed during reinit if supported.
> +	 */

This comment should be moved inside the "if" condition here as done in the next
patch.

- Mani

> +	if (host->hw_ver.major < 0x5)
> +		host->phy_gear = UFS_HS_G2;
>  }
>  
>  static void ufs_qcom_set_caps(struct ufs_hba *hba)
> @@ -1313,12 +1321,6 @@ static int ufs_qcom_init(struct ufs_hba *hba)
>  		dev_warn(dev, "%s: failed to configure the testbus %d\n",
>  				__func__, err);
>  
> -	/*
> -	 * Power up the PHY using the minimum supported gear (UFS_HS_G2).
> -	 * Switching to max gear will be performed during reinit if supported.
> -	 */
> -	host->phy_gear = UFS_HS_G2;
> -
>  	return 0;
>  
>  out_variant_clear:
> -- 
> 2.7.4
> 

-- 
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