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Subject[PATCH v4 2/2] scsi: ufs-qcom: enter and exit hibern8 during clock scaling
Date
Qualcomm controller needs to be in hibern8 before scaling clocks.
This change puts the controller in hibern8 state before scaling
and brings it out after scaling of clocks.

Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
---
drivers/scsi/ufs/ufs-qcom.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c
index 00ce8d6..3a4ed64 100644
--- a/drivers/scsi/ufs/ufs-qcom.c
+++ b/drivers/scsi/ufs/ufs-qcom.c
@@ -1418,18 +1418,27 @@ static int ufs_qcom_clk_scale_notify(struct ufs_hba *hba,
int err = 0;

if (status == PRE_CHANGE) {
+ err = ufshcd_uic_hibern8_enter(hba);
+ if (err)
+ return err;
if (scale_up)
err = ufs_qcom_clk_scale_up_pre_change(hba);
else
err = ufs_qcom_clk_scale_down_pre_change(hba);
+ if (err)
+ ufshcd_uic_hibern8_exit(hba);
+
} else {
if (scale_up)
err = ufs_qcom_clk_scale_up_post_change(hba);
else
err = ufs_qcom_clk_scale_down_post_change(hba);

- if (err || !dev_req_params)
+
+ if (err || !dev_req_params) {
+ ufshcd_uic_hibern8_exit(hba);
goto out;
+ }

ufs_qcom_cfg_timers(hba,
dev_req_params->gear_rx,
@@ -1437,6 +1446,7 @@ static int ufs_qcom_clk_scale_notify(struct ufs_hba *hba,
dev_req_params->hs_rate,
false);
ufs_qcom_update_bus_bw_vote(host);
+ err = ufshcd_uic_hibern8_exit(hba);
}

out:
--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.
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