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

Manivannan Sadhasivam
2023-11-30T06:48:23Z

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@quicinc.com>

One comment below. With that addressed,

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.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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