linux-kernel - Re: [PATCH 1/4] clk: qcom: branch: Extend the invert logic for branch2 clocks

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Date:   Mon, 8 May 2023 16:31:11 +0530
From:   Taniya Das <quic_tdas@...cinc.com>
To:     Stephen Boyd <sboyd@...nel.org>, Andy Gross <agross@...nel.org>,
        "Bjorn Andersson" <andersson@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Richard Cochran <richardcochran@...il.com>,
        "Rob Herring" <robh+dt@...nel.org>
CC:     <quic_skakitap@...cinc.com>,
        Imran Shaik <quic_imrashai@...cinc.com>,
        <linux-arm-msm@...r.kernel.org>, <linux-clk@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <quic_rohiagar@...cinc.com>, <netdev@...r.kernel.org>
Subject: Re: [PATCH 1/4] clk: qcom: branch: Extend the invert logic for
 branch2 clocks

Hello Stephen,

Thanks for your review.

On 4/20/2023 3:07 AM, Stephen Boyd wrote:
> Quoting Taniya Das (2023-04-19 06:30:10)
>> From: Imran Shaik <quic_imrashai@...cinc.com>
>>
>> Add support to handle the invert logic for branch2 clocks.
>> Invert branch halt would indicate the clock ON when CLK_OFF
>> bit is '1' and OFF when CLK_OFF bit is '0'.
>>
>> Signed-off-by: Imran Shaik <quic_imrashai@...cinc.com>
>> Signed-off-by: Taniya Das <quic_tdas@...cinc.com>
>> ---
>>   drivers/clk/qcom/clk-branch.c | 8 ++++++++
>>   1 file changed, 8 insertions(+)
>>
>> diff --git a/drivers/clk/qcom/clk-branch.c b/drivers/clk/qcom/clk-branch.c
>> index f869fc6aaed6..4b24d45be771 100644
>> --- a/drivers/clk/qcom/clk-branch.c
>> +++ b/drivers/clk/qcom/clk-branch.c
>> @@ -48,6 +48,7 @@ static bool clk_branch2_check_halt(const struct clk_branch *br, bool enabling)
>>   {
>>          u32 val;
>>          u32 mask;
>> +       bool invert = (br->halt_check == BRANCH_HALT_ENABLE);
>>   
>>          mask = BRANCH_NOC_FSM_STATUS_MASK << BRANCH_NOC_FSM_STATUS_SHIFT;
>>          mask |= BRANCH_CLK_OFF;
>> @@ -56,9 +57,16 @@ static bool clk_branch2_check_halt(const struct clk_branch *br, bool enabling)
>>   
>>          if (enabling) {
>>                  val &= mask;
>> +
>> +               if (invert)
>> +                       return (val & BRANCH_CLK_OFF) == BRANCH_CLK_OFF;
>> +
>>                  return (val & BRANCH_CLK_OFF) == 0 ||
>>                          val == BRANCH_NOC_FSM_STATUS_ON;
> 
> Do these clks have a NOC_FSM_STATUS bit? I think it would be better to
> make a local variable for the val we're looking for, and then test for
> that. We may need a mask as well, but the idea is to not duplicate the
> test and return from multiple places.
> 

Clocks which has invert status doesn't have NOC_FSM_STATUS bit.
Will remove the multiple returns in next patch.

>>          } else {
>> +               if (invert)
>> +                       return (val & BRANCH_CLK_OFF) == 0;
>> +
>>                  return val & BRANCH_CLK_OFF;
>>          }
> 
> While at it, I'd get rid of this else and de-indent the code because if
> we're 'enabling' we'll return from the function regardless.


Yes, Stephen, will take care in the next patch.

-- 
Thanks & Regards,
Taniya Das.