RE: [PATCH v1 2/2] scsi: ufs-qcom: enter and exit hibern8 during clock scaling

From: Alim Akhtar
Date: Tue Sep 28 2021 - 02:05:43 EST


Hello,

>-----Original Message-----
>From: nguyenb=codeaurora.org@xxxxxxxxxxxxxxxxx
>[mailto:nguyenb=codeaurora.org@xxxxxxxxxxxxxxxxx] On Behalf Of Bao D.
>Nguyen
>Sent: Tuesday, September 21, 2021 2:38 AM
>To: cang@xxxxxxxxxxxxxx; asutoshd@xxxxxxxxxxxxxx;
>martin.petersen@xxxxxxxxxx; linux-scsi@xxxxxxxxxxxxxxx
>Cc: linux-arm-msm@xxxxxxxxxxxxxxx; Bao D . Nguyen
><nguyenb@xxxxxxxxxxxxxx>; Andy Gross <agross@xxxxxxxxxx>; Bjorn Andersson
><bjorn.andersson@xxxxxxxxxx>; Alim Akhtar <alim.akhtar@xxxxxxxxxxx>; Avri
>Altman <avri.altman@xxxxxxx>; James E.J. Bottomley <jejb@xxxxxxxxxxxxx>;
>open list <linux-kernel@xxxxxxxxxxxxxxx>
>Subject: [PATCH v1 2/2] scsi: ufs-qcom: enter and exit hibern8 during clock
scaling
>
>From: Asutosh Das <asutoshd@xxxxxxxxxxxxxx>
>
>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@xxxxxxxxxxxxxx>
>Signed-off-by: Bao D. Nguyen <nguyenb@xxxxxxxxxxxxxx>
>---

Reviewed-by: Alim Akhtar <alim.akhtar@xxxxxxxxxxx>

> 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
>92d4c61..92f5bb4 100644
>--- a/drivers/scsi/ufs/ufs-qcom.c
>+++ b/drivers/scsi/ufs/ufs-qcom.c
>@@ -1212,24 +1212,34 @@ 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,
> dev_req_params->pwr_rx,
> dev_req_params->hs_rate,
> false);
>+ ufshcd_uic_hibern8_exit(hba);
> }
>
> out:
>--
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