linux-kernel - Re: [PATCH v1 1/4] clk: qcom: gdsc: Add support to enable retention of GSDCR

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Message-ID: <4d5bf27a-f2dd-104a-094f-dab1c159d666@codeaurora.org>
Date:   Sun, 17 May 2020 14:47:49 +0530
From:   Taniya Das <tdas@...eaurora.org>
To:     Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette <mturquette@...libre.com>
Cc:     David Brown <david.brown@...aro.org>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        Andy Gross <agross@...nel.org>, devicetree@...r.kernel.org,
        robh@...nel.org, robh+dt@...nel.org
Subject: Re: [PATCH v1 1/4] clk: qcom: gdsc: Add support to enable retention
 of GSDCR

Hello Stephen,

Thanks for the review.

On 4/10/2020 1:36 AM, Stephen Boyd wrote:
> Quoting Taniya Das (2020-03-27 12:48:02)
>> diff --git a/drivers/clk/qcom/gdsc.c b/drivers/clk/qcom/gdsc.c
>> index a250f59..cfe908f 100644
>> --- a/drivers/clk/qcom/gdsc.c
>> +++ b/drivers/clk/qcom/gdsc.c
>> @@ -28,6 +28,7 @@
>>   /* CFG_GDSCR */
>>   #define GDSC_POWER_UP_COMPLETE         BIT(16)
>>   #define GDSC_POWER_DOWN_COMPLETE       BIT(15)
>> +#define GDSC_RETAIN_FF_ENABLE          BIT(11)
>>   #define CFG_GDSCR_OFFSET               0x4
>>
>>   /* Wait 2^n CXO cycles between all states. Here, n=2 (4 cycles). */
>> @@ -202,6 +203,14 @@ static inline void gdsc_assert_reset_aon(struct gdsc *sc)
>>          regmap_update_bits(sc->regmap, sc->clamp_io_ctrl,
>>                             GMEM_RESET_MASK, 0);
>>   }
>> +
>> +static inline void gdsc_retain_ff_on(struct gdsc *sc)
> 
> Drop inline please.
> 

Will drop in the next patch.

>> +{
>> +       u32 mask = RETAIN_FF_ENABLE;
> 
> Is this supposed to be GDSC_RETAIN_FF_ENABLE?
> 

Will update in next patch.

>> +
>> +       regmap_update_bits(sc->regmap, sc->gdscr, mask, mask);
>> +}
>> +
>>   static int gdsc_enable(struct generic_pm_domain *domain)
>>   {
>>          struct gdsc *sc = domain_to_gdsc(domain);
>> @@ -254,6 +263,9 @@ static int gdsc_enable(struct generic_pm_domain *domain)
>>                  udelay(1);
>>          }
>>
>> +       if (sc->flags & RETAIN_FF_ENABLE)
>> +               gdsc_retain_ff_on(sc);
>> +
>>          return 0;
>>   }
>>
>> diff --git a/drivers/clk/qcom/gdsc.h b/drivers/clk/qcom/gdsc.h
>> index 64cdc8c..8604d44 100644
>> --- a/drivers/clk/qcom/gdsc.h
>> +++ b/drivers/clk/qcom/gdsc.h
>> @@ -49,6 +49,7 @@ struct gdsc {
>>   #define AON_RESET      BIT(4)
>>   #define POLL_CFG_GDSCR BIT(5)
>>   #define ALWAYS_ON      BIT(6)
>> +#define RETAIN_FF_ENABLE       BIT(7)
> 
> This is a flag, not a register bit presumably.

Yes, it is a flag.

> 
>>          struct reset_controller_dev     *rcdev;
>>          unsigned int                    *resets;
>>          unsigned int                    reset_count;

-- 
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation.

--