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Message-ID: <9624e970765dc0739793612c2a5c53bc@codeaurora.org>
Date: Tue, 11 Aug 2020 15:09:43 -0700
From: Tanmay Shah <tanmay@...eaurora.org>
To: Randy Dunlap <rdunlap@...radead.org>
Cc: David Airlie <airlied@...ux.ie>,
linux-arm-msm <linux-arm-msm@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
dri-devel <dri-devel@...ts.freedesktop.org>,
Stephen Boyd <swboyd@...omium.org>, khsieh@...eaurora.org,
Rob Clark <robdclark@...il.com>,
Sean Paul <seanpaul@...omium.org>,
Abhinav Kumar <abhinavk@...eaurora.org>,
Daniel Vetter <daniel@...ll.ch>,
Vara Reddy <varar@...eaurora.org>, aravindh@...eaurora.org,
freedreno <freedreno@...ts.freedesktop.org>,
Chandan Uddaraju <chandanu@...eaurora.org>
Subject: Re: [Freedreno] [PATCH v9 3/5] drm/msm/dp: add support for DP PLL
driver
On 2020-08-11 13:21, Randy Dunlap wrote:
> On 8/11/20 12:49 PM, tanmay@...eaurora.org wrote:
>> 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'.
>
> If it is required, then you don't need to have a Kconfig entry/symbol
> for it.
Kconfig makes driver flexible. Other moudles in the driver are also
'default y' such as DSI. I will let Rob guide us further on this as he
is the maintainer.
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