linux-kernel - Re: [PATCH v1 1/2] scsi: ufs: export hibern8 entry and exit

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Date:   Tue, 28 Sep 2021 10:30:06 -0700
From:   nguyenb@...eaurora.org
To:     Alim Akhtar <alim.akhtar@...sung.com>
Cc:     cang@...eaurora.org, asutoshd@...eaurora.org,
        martin.petersen@...cle.com, linux-scsi@...r.kernel.org,
        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 v1 1/2] scsi: ufs: export hibern8 entry and exit

On 2021-09-27 22:39, Alim Akhtar wrote:
> Hi Bao
> 
>> -----Original Message-----
>> From: nguyenb=codeaurora.org@...codeaurora.org
>> [mailto:nguyenb=codeaurora.org@...codeaurora.org] On Behalf Of Bao D.
>> Nguyen
>> Sent: Tuesday, September 21, 2021 2:38 AM
>> 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 v1 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>
>> ---
>> drivers/scsi/ufs/ufshcd.c | 4 ++--
>> drivers/scsi/ufs/ufshcd.h | 2 ++
>> 2 files changed, 4 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..0cc55a2
>> 100644
>> --- a/drivers/scsi/ufs/ufshcd.h
>> +++ b/drivers/scsi/ufs/ufshcd.h
>> @@ -1397,4 +1397,6 @@ static inline int ufshcd_rpmb_rpm_put(struct 
>> ufs_hba
>> *hba)
>> 	return pm_runtime_put(&hba->sdev_rpmb->sdev_gendev);
>> }
>> 
>> +int ufshcd_uic_hibern8_enter(struct ufs_hba *hba); int
>> +ufshcd_uic_hibern8_exit(struct ufs_hba *hba);
> 
> This will add ufshcd_uic_hibern8_exit() twice, it is already add by
> commit: 9d19bf7ad168a8: scsi: ufs: export some functions for vendor 
> usage
Thank you, Alim. I have corrected this in Patch V2.

> 
> Also move ufshcd_uic_hibern8_enter() before _earlier_
> ufshcd_uic_hibern8_exit() declaration.
Yes, I have addressed this in the Patch V2. Please review.
Thank you.

> 
>> #endif /* End of Header */
>> --
>> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora 
>> Forum,
> a
>> Linux Foundation Collaborative Project