From: Asutosh Das <asutoshd@codeaurora.org>
To: cang@codeaurora.org, martin.petersen@oracle.com,
PedroM.Sousa@synopsys.com, linux-scsi@vger.kernel.org
Cc: Asutosh Das <asutoshd@codeaurora.org>,
linux-arm-msm@vger.kernel.org, Andy Gross <agross@kernel.org>,
Bjorn Andersson <bjorn.andersson@linaro.org>,
Alim Akhtar <alim.akhtar@samsung.com>,
Avri Altman <avri.altman@wdc.com>,
"James E.J. Bottomley" <jejb@linux.ibm.com>,
linux-kernel@vger.kernel.org (open list)
Subject: [PATCH v4 2/2] scsi: ufs-qcom: enter and exit hibern8 during clock scaling
Date: Wed, 20 May 2020 10:53:17 -0700 [thread overview]
Message-ID: <9b67c25eb7c0bf80075b36660aebdb3788207353.1589997078.git.asutoshd@codeaurora.org> (raw)
In-Reply-To: <186237103353b5a79c3496e619fca894dbc78600.1589997078.git.asutoshd@codeaurora.org>
In-Reply-To: <186237103353b5a79c3496e619fca894dbc78600.1589997078.git.asutoshd@codeaurora.org>
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.
next prev parent reply other threads:[~2020-05-20 17:53 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-20 17:53 [PATCH v4 1/2] scsi: ufs: export hibern8 entry Asutosh Das
2020-05-20 17:53 ` Asutosh Das [this message]
2020-05-20 21:33 ` [PATCH v4 2/2] scsi: ufs-qcom: enter and exit hibern8 during clock scaling Avri Altman
2020-05-20 21:59 ` Asutosh Das (asd)
[not found] ` <CAF2Aj3gpMhPf8dF7cxcW0AhwGmGtf=LbO6HPB0u3FxudWTBcoQ@mail.gmail.com>
2021-05-25 16:44 ` Asutosh Das (asd)
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