linux-kernel - Re: [PATCH v6 06/10] scsi: ufs: ufs-qcom: Set initial PHY gear to max HS gear for HW ver 4 and newer

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Date:   Thu, 30 Nov 2023 12:17:57 +0530
From:   Manivannan Sadhasivam <mani@...nel.org>
To:     Can Guo <quic_cang@...cinc.com>
Cc:     bvanassche@....org, adrian.hunter@...el.com, cmd4@...lcomm.com,
        beanhuo@...ron.com, avri.altman@....com, junwoo80.lee@...sung.com,
        martin.petersen@...cle.com, linux-scsi@...r.kernel.org,
        linux-arm-msm@...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 <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 06/10] scsi: ufs: ufs-qcom: Set initial PHY gear to
 max HS gear for HW ver 4 and newer

On Wed, Nov 29, 2023 at 12:28:31AM -0800, Can Guo wrote:
> Since HW ver 4, max HS gear can be get from UFS host controller's register,
> use the max HS gear as the initial PHY gear instead of UFS_HS_G2, so that
> we don't need to update the hard code for newer targets in future.
> 
> Signed-off-by: Can Guo <quic_cang@...cinc.com>

One comment below. With that addressed,

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>

> ---
>  drivers/ufs/host/ufs-qcom.c | 21 +++++++++++++++------
>  1 file changed, 15 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
> index aca6199..30f4ca6 100644
> --- a/drivers/ufs/host/ufs-qcom.c
> +++ b/drivers/ufs/host/ufs-qcom.c
> @@ -1060,6 +1060,20 @@ static void ufs_qcom_advertise_quirks(struct ufs_hba *hba)
>  		hba->quirks |= UFSHCD_QUIRK_REINIT_AFTER_MAX_GEAR_SWITCH;
>  }
>  
> +static void ufs_qcom_set_phy_gear(struct ufs_qcom_host *host)
> +{
> +	struct ufs_host_params *host_params = &host->host_params;
> +
> +	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.

As I mentioned in v5, you need to reword this comment to make it clear we are
setting G2 only for platforms < v4. Something like below:

"For controllers whose major version is < 4, power up the PHY using minimum
supported gear (UFS_HS_G2). Switching to max gear will be performed during
reinit if supported. For newer controllers (>= 4), PHY will be powered up using
max supported gear."

- Mani

> +	 */
> +	if (host->hw_ver.major < 0x4)
> +		host->phy_gear = UFS_HS_G2;
> +}
> +
>  static void ufs_qcom_set_host_params(struct ufs_hba *hba)
>  {
>  	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
> @@ -1296,6 +1310,7 @@ static int ufs_qcom_init(struct ufs_hba *hba)
>  	ufs_qcom_set_caps(hba);
>  	ufs_qcom_advertise_quirks(hba);
>  	ufs_qcom_set_host_params(hba);
> +	ufs_qcom_set_phy_gear(host);
>  
>  	err = ufs_qcom_ice_init(host);
>  	if (err)
> @@ -1313,12 +1328,6 @@ 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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