linux-kernel - RE: [PATCH v2 1/2] scsi: ufs: export hibern8 entry and exit

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Date:   Wed, 29 Sep 2021 08:43:54 +0530
From:   "Alim Akhtar" <alim.akhtar@...sung.com>
To:     "'Bao D. Nguyen'" <nguyenb@...eaurora.org>, <cang@...eaurora.org>,
        <asutoshd@...eaurora.org>, <martin.petersen@...cle.com>,
        <linux-scsi@...r.kernel.org>
Cc:     <linux-arm-msm@...r.kernel.org>,
        "'Avri Altman'" <avri.altman@....com>,
        "'James E.J. Bottomley'" <jejb@...ux.ibm.com>,
        "'Bean Huo'" <beanhuo@...ron.com>,
        "'Stanley Chu'" <stanley.chu@...iatek.com>,
        "'Bart Van Assche'" <bvanassche@....org>,
        "'Jaegeuk Kim'" <jaegeuk@...nel.org>,
        "'Adrian Hunter'" <adrian.hunter@...el.com>,
        "'Keoseong Park'" <keosung.park@...sung.com>,
        "'open list'" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2 1/2] scsi: ufs: export hibern8 entry and exit


Hello,

>-----Original Message-----
>From: nguyenb=codeaurora.org@...codeaurora.org
>[mailto:nguyenb=codeaurora.org@...codeaurora.org] On Behalf Of Bao D.
>Nguyen
>Sent: Tuesday, September 28, 2021 2:36 PM
>To: cang@...eaurora.org; asutoshd@...eaurora.org;
>martin.petersen@...cle.com; linux-scsi@...r.kernel.org
>Cc: linux-arm-msm@...r.kernel.org; Bao D . Nguyen
><nguyenb@...eaurora.org>; Alim Akhtar <alim.akhtar@...sung.com>; Avri
>Altman <avri.altman@....com>; James E.J. Bottomley <jejb@...ux.ibm.com>;
>Bean Huo <beanhuo@...ron.com>; Stanley Chu <stanley.chu@...iatek.com>;
>Bart Van Assche <bvanassche@....org>; Jaegeuk Kim <jaegeuk@...nel.org>;
>Adrian Hunter <adrian.hunter@...el.com>; Keoseong Park
><keosung.park@...sung.com>; open list <linux-kernel@...r.kernel.org>
>Subject: [PATCH v2 1/2] scsi: ufs: export hibern8 entry and exit
>
>From: Asutosh Das <asutoshd@...eaurora.org>
>
>Qualcomm controllers need to be in hibern8 before scaling up or down the
>clocks. Hence, export the hibern8 entry and exit functions.
>
>Signed-off-by: Asutosh Das <asutoshd@...eaurora.org>
>Signed-off-by: Bao D. Nguyen <nguyenb@...eaurora.org>
>---

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

> drivers/scsi/ufs/ufshcd.c | 4 ++--
> drivers/scsi/ufs/ufshcd.h | 1 +
> 2 files changed, 3 insertions(+), 2 deletions(-)
>
>diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index
>3841ab49..f3aad32 100644
>--- a/drivers/scsi/ufs/ufshcd.c
>+++ b/drivers/scsi/ufs/ufshcd.c
>@@ -227,7 +227,6 @@ static void ufshcd_hba_exit(struct ufs_hba *hba);
static
>int ufshcd_clear_ua_wluns(struct ufs_hba *hba);  static int
>ufshcd_probe_hba(struct ufs_hba *hba, bool async);  static int
>ufshcd_setup_clocks(struct ufs_hba *hba, bool on); -static int
>ufshcd_uic_hibern8_enter(struct ufs_hba *hba);  static inline void
>ufshcd_add_delay_before_dme_cmd(struct ufs_hba *hba);  static int
>ufshcd_host_reset_and_restore(struct ufs_hba *hba);  static void
>ufshcd_resume_clkscaling(struct ufs_hba *hba); @@ -4116,7 +4115,7 @@ int
>ufshcd_link_recovery(struct ufs_hba *hba)  }
>EXPORT_SYMBOL_GPL(ufshcd_link_recovery);
>
>-static int ufshcd_uic_hibern8_enter(struct ufs_hba *hba)
>+int ufshcd_uic_hibern8_enter(struct ufs_hba *hba)
> {
> 	int ret;
> 	struct uic_command uic_cmd = {0};
>@@ -4138,6 +4137,7 @@ static int ufshcd_uic_hibern8_enter(struct ufs_hba
>*hba)
>
> 	return ret;
> }
>+EXPORT_SYMBOL_GPL(ufshcd_uic_hibern8_enter);
>
> int ufshcd_uic_hibern8_exit(struct ufs_hba *hba)  { diff --git
>a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h index
52ea6f3..124f50b
>100644
>--- a/drivers/scsi/ufs/ufshcd.h
>+++ b/drivers/scsi/ufs/ufshcd.h
>@@ -1001,6 +1001,7 @@ int ufshcd_init(struct ufs_hba *, void __iomem *,
>unsigned int);  int ufshcd_link_recovery(struct ufs_hba *hba);  int
>ufshcd_make_hba_operational(struct ufs_hba *hba);  void
ufshcd_remove(struct
>ufs_hba *);
>+int ufshcd_uic_hibern8_enter(struct ufs_hba *hba);
> int ufshcd_uic_hibern8_exit(struct ufs_hba *hba);  void
>ufshcd_delay_us(unsigned long us, unsigned long tolerance);  int
>ufshcd_wait_for_register(struct ufs_hba *hba, u32 reg, u32 mask,
>--
>The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a
>Linux Foundation Collaborative Project