Re: [PATCH v5 06/10] scsi: ufs: ufs-qcom: Limit HS-G5 Rate-A to hosts with HW version 5

Nitin Rawat
2023-11-28T05:16:35Z

On 11/23/2023 2:16 PM, Can Guo wrote:
> Qcom UFS hosts, with HW ver 5, can only support up to HS-G5 Rate-A due to
> HW limitations. If the HS-G5 PHY gear is used, update host_params->hs_rate
> to Rate-A, so that the subsequent power mode changes shall stick to Rate-A.
>
> Signed-off-by: Can Guo <quic_cang@quicinc.com>
> ---
> drivers/ufs/host/ufs-qcom.c | 18 +++++++++++++++++-
> 1 file changed, 17 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
> index 9613ad9..6756f8d 100644
> --- a/drivers/ufs/host/ufs-qcom.c
> +++ b/drivers/ufs/host/ufs-qcom.c
> @@ -442,9 +442,25 @@ static u32 ufs_qcom_get_hs_gear(struct ufs_hba *hba)
> static int ufs_qcom_power_up_sequence(struct ufs_hba *hba)
> {
> struct ufs_qcom_host *host = ufshcd_get_variant(hba);
> + struct ufs_host_params *host_params = &host->host_params;
> struct phy *phy = host->generic_phy;
> + enum phy_mode mode;
> int ret;
>
> + /*
> + * HW ver 5 can only support up to HS-G5 Rate-A due to HW limitations.
> + * If the HS-G5 PHY gear is used, update host_params->hs_rate to Rate-A,
> + * so that the subsequent power mode change shall stick to Rate-A.
> + */
> + if (host->hw_ver.major == 0x5) {
> + if (host->phy_gear == UFS_HS_G5)
> + host_params->hs_rate = PA_HS_MODE_A;
> + else
> + host_params->hs_rate = PA_HS_MODE_B;
> + }
> +
> + mode = host_params->hs_rate == PA_HS_MODE_B ? PHY_MODE_UFS_HS_B : PHY_MODE_UFS_HS_A;
> +
> /* Reset UFS Host Controller and PHY */
> ret = ufs_qcom_host_reset(hba);
> if (ret)
> @@ -459,7 +475,7 @@ static int ufs_qcom_power_up_sequence(struct ufs_hba *hba)
> return ret;
> }
>
> - phy_set_mode_ext(phy, PHY_MODE_UFS_HS_B, host->phy_gear);
> + phy_set_mode_ext(phy, mode, host->phy_gear);
>
> /* power on phy - start serdes and phy's power and clocks */
> ret = phy_power_on(phy);

Reviewed-by: Nitin Rawat <quic_nitirawa@quicinc.com>