linux-kernel - Re: [PATCH v2] scsi: ufs: Give clk scaling min gear a value

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Date:   Thu, 28 Jan 2021 11:34:45 +0800
From:   Can Guo <cang@...eaurora.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     jaegeuk@...nel.org, asutoshd@...eaurora.org,
        nguyenb@...eaurora.org, hongwus@...eaurora.org,
        linux-scsi@...r.kernel.org, kernel-team@...roid.com,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Bean Huo <beanhuo@...ron.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] scsi: ufs: Give clk scaling min gear a value

On 2021-01-28 11:28, Bjorn Andersson wrote:
> On Wed 27 Jan 20:49 CST 2021, Can Guo wrote:
> 
>> The initialization of clk_scaling.min_gear was removed by mistake. 
>> This
>> change adds it back, otherwise clock scaling down would fail.
>> 
> 
> Thanks for the patch Can, it solves the problem I'm seeing!
> 
> Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> Tested-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> 
> 
> And perhaps a:
> 
> Reported-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> 

I missed the two lines due to I was not working on the latest
scsi code tip - I should have tested it based on commit 29b87e92a216
("scsi: ufs: Stop hardcoding the scale down gear"), my bad.

Anyways, thanks for the test!

Regards,
Can Guo.

> Regards,
> Bjorn
> 
>> Fixes: 4543d9d78227 ("scsi: ufs: Refactor 
>> ufshcd_init/exit_clk_scaling/gating()")
>> 
>> Signed-off-by: Can Guo <cang@...eaurora.org>
>> ---
>>  drivers/scsi/ufs/ufshcd.c | 3 +++
>>  1 file changed, 3 insertions(+)
>> 
>> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
>> index 36bcbb3..8ef6796 100644
>> --- a/drivers/scsi/ufs/ufshcd.c
>> +++ b/drivers/scsi/ufs/ufshcd.c
>> @@ -1602,6 +1602,9 @@ static void ufshcd_init_clk_scaling(struct 
>> ufs_hba *hba)
>>  	if (!ufshcd_is_clkscaling_supported(hba))
>>  		return;
>> 
>> +	if (!hba->clk_scaling.min_gear)
>> +		hba->clk_scaling.min_gear = UFS_HS_G1;
>> +
>>  	INIT_WORK(&hba->clk_scaling.suspend_work,
>>  		  ufshcd_clk_scaling_suspend_work);
>>  	INIT_WORK(&hba->clk_scaling.resume_work,
>> --
>> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a 
>> Linux Foundation Collaborative Project.
>>