linux-kernel - Re: [PATCH v9 3/5] drm/msm/dp: add support for DP PLL driver

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Message-ID: <639438051c1b2fe1d9bec5f6343a6dec@codeaurora.org>
Date:   Tue, 11 Aug 2020 12:49:00 -0700
From:   tanmay@...eaurora.org
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     Stephen Boyd <swboyd@...omium.org>,
        Rob Clark <robdclark@...il.com>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        freedreno <freedreno@...ts.freedesktop.org>,
        Sean Paul <seanpaul@...omium.org>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>, aravindh@...eaurora.org,
        Abhinav Kumar <abhinavk@...eaurora.org>, khsieh@...eaurora.org,
        Chandan Uddaraju <chandanu@...eaurora.org>,
        Vara Reddy <varar@...eaurora.org>
Subject: Re: [PATCH v9 3/5] drm/msm/dp: add support for DP PLL driver

On 2020-08-07 13:28, Randy Dunlap wrote:
> On 8/7/20 1:24 PM, Stephen Boyd wrote:
>> Quoting Rob Clark (2020-08-07 08:51:48)
>>> On Fri, Aug 7, 2020 at 8:27 AM Randy Dunlap <rdunlap@...radead.org>
>>> wrote:
>>>> 
>>>> On 8/7/20 12:17 AM, Tanmay Shah wrote:
>>>>> diff --git a/drivers/gpu/drm/msm/Kconfig 
>>>>> b/drivers/gpu/drm/msm/Kconfig
>>>>> index ea3c4d094d09..cc1392b29022 100644
>>>>> --- a/drivers/gpu/drm/msm/Kconfig
>>>>> +++ b/drivers/gpu/drm/msm/Kconfig
>>>>> @@ -60,6 +60,7 @@ config DRM_MSM_HDMI_HDCP
>>>>>  config DRM_MSM_DP
>>>>>       bool "Enable DP support in MSM DRM driver"
>>>>>       depends on DRM_MSM
>>>>> +     default y
>>>>>       help
>>>>>         Compile in support for DP driver in msm drm driver. DP 
>>>>> external
>>>>>         display support is enabled through this config option. It 
>>>>> can
>>>> 
>>>> Hi,
>>>> 
>>>> You need a very strong justification to make an optional part of a
>>>> driver
>>>> to be "default y".
>>> 
>>> My opinion is that if the driver is built, everything should be 
>>> built.
>>> This is what makes sense for distro's.  It is only the embedded case
>>> where you want to trim down unneeded features where you might want to
>>> disable some parts.  So 'default y' makes sense to me.
> 
> We don't set defaults for distro convenience.
> 
>> 
>> Maybe use 'default DRM_MSM' so that it doesn't trigger the 'default y'
>> filters people have?
> 
> Most people can figure that one out.  ;)
> I don't have any automated filters.

After after further reviews, I agree with Rob. Display Port is required 
module as of now so it makes sense to keep 'default y'.