[PATCH v2 4/7] scsi: ufs: ufs-qcom: Limit HS-G5 Rate-A to hosts with HW version 5

Can Guo
2023-11-07T04:47:24Z

From: Can Guo <quic_cang@quicinc.com>

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 60b35ca..55ee31d 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);
--
2.7.4