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scsi: ufs: ufs-qcom: Limit HS-G5 Rate-A to hosts with HW version 5

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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.

Reviewed-by: Nitin Rawat <quic_nitirawa@quicinc.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Can Guo <quic_cang@quicinc.com>
Link: https://lore.kernel.org/r/1701520577-31163-6-git-send-email-quic_cang@quicinc.com
Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on SM8550-QRD
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Can Guo 2023-12-02 04:36:11 -08:00 committed by Martin K. Petersen
parent 743e1f596c
commit 9d8528a833
1 changed files with 17 additions and 1 deletions
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18
drivers/ufs/host/ufs-qcom.c
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@ -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);