linux-kernel - Re: [PATCH V5 07/11] phy: qcom-qmp-ufs: Remove qmp_ufs_exit() and Inline qmp_ufs_com

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Message-ID: <6d3fabc6-9701-443d-a08d-71e6c69e4ed0@quicinc.com>
Date: Thu, 22 May 2025 14:50:17 +0530
From: Nitin Rawat <quic_nitirawa@...cinc.com>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
CC: <vkoul@...nel.org>, <kishon@...nel.org>,
        <James.Bottomley@...senpartnership.com>, <martin.petersen@...cle.com>,
        <bvanassche@....org>, <andersson@...nel.org>,
        <neil.armstrong@...aro.org>, <dmitry.baryshkov@....qualcomm.com>,
        <konrad.dybcio@....qualcomm.com>, <quic_rdwivedi@...cinc.com>,
        <quic_cang@...cinc.com>, <linux-arm-msm@...r.kernel.org>,
        <linux-phy@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <linux-scsi@...r.kernel.org>
Subject: Re: [PATCH V5 07/11] phy: qcom-qmp-ufs: Remove qmp_ufs_exit() and
 Inline qmp_ufs_com_exit()



On 5/22/2025 2:23 PM, Manivannan Sadhasivam wrote:
> On Thu, May 22, 2025 at 03:49:12AM +0530, Nitin Rawat wrote:
>>
>>
>> On 5/21/2025 7:19 PM, Manivannan Sadhasivam wrote:
>>> On Thu, May 15, 2025 at 09:57:18PM +0530, Nitin Rawat wrote:
>>>> qmp_ufs_exit() is a wrapper function. It only calls qmp_ufs_com_exit().
>>>> Remove it to simplify the ufs phy driver.
>>>>
>>>
>>> Okay, so you are doing it now...
>>
>> Yes
>>
>>>
>>>> Additonally partial Inline(dropping the reset assert) qmp_ufs_com_exit
>>>> into qmp_ufs_power_off function to avoid unnecessary function call.
>>>>
>>>
>>> Why are you dropping the reset_assert()?
>>
>> This was not aligning to Phy programming guide .
>>
> 
> You should mention it in the description.

Sure, will update the commit text.

> 
>>
>>>
>>>> Signed-off-by: Nitin Rawat <quic_nitirawa@...cinc.com>
>>>> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
>>>> ---
>>>>    drivers/phy/qualcomm/phy-qcom-qmp-ufs.c | 19 +++++--------------
>>>>    1 file changed, 5 insertions(+), 14 deletions(-)
>>>>
>>>> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-ufs.c b/drivers/phy/qualcomm/phy-qcom-qmp-ufs.c
>>>> index a5974a1fb5bb..fca47e5e8bf0 100644
>>>> --- a/drivers/phy/qualcomm/phy-qcom-qmp-ufs.c
>>>> +++ b/drivers/phy/qualcomm/phy-qcom-qmp-ufs.c
>>>> @@ -1758,19 +1758,6 @@ static void qmp_ufs_init_registers(struct qmp_ufs *qmp, const struct qmp_phy_cfg
>>>>    		qmp_ufs_init_all(qmp, &cfg->tbls_hs_b);
>>>>    }
>>>> -static int qmp_ufs_com_exit(struct qmp_ufs *qmp)
>>>> -{
>>>> -	const struct qmp_phy_cfg *cfg = qmp->cfg;
>>>> -
>>>> -	reset_control_assert(qmp->ufs_reset);
>>>> -
>>>> -	clk_bulk_disable_unprepare(qmp->num_clks, qmp->clks);
>>>> -
>>>> -	regulator_bulk_disable(cfg->num_vregs, qmp->vregs);
>>>> -
>>>> -	return 0;
>>>> -}
>>>> -
>>>>    static int qmp_ufs_power_on(struct phy *phy)
>>>>    {
>>>>    	struct qmp_ufs *qmp = phy_get_drvdata(phy);
>>>> @@ -1851,7 +1838,11 @@ static int qmp_ufs_power_off(struct phy *phy)
>>>>    	qphy_clrbits(qmp->pcs, cfg->regs[QPHY_PCS_POWER_DOWN_CONTROL],
>>>>    			SW_PWRDN);
>>>> -	qmp_ufs_com_exit(qmp);
>>>> +	/* Turn off all the phy clocks */
>>>
>>> You should drop this and below comment. They add no value.
>>
>> Comments are actually provided for each operation within qmp_ufs_power_off
>> which actually facilitate understanding of all actions performed by the
>> function which may not be fully clear by code. Hence
>> I thought to keep the comments. But If you insist i'll remove.
>>
> 
> For complex code, comment should be added indeed. But for
> clk_bulk_disable_unprepare() and regulator_bulk_disable(), NO. It is obvious
> that they turn off clock and regulators.

ok sure, will remove it.

> 
> - Mani
>