[PATCH v3 12/32] drm/exynos: Split manager/display/subdrv

[Sean Paul]

On Fri, Nov 29, 2013 at 12:05 PM, Tomasz Figa <t.figa at samsung.com> wrote:
> On Friday 29 of November 2013 09:13:19 Rob Clark wrote:
>> On Fri, Nov 29, 2013 at 4:10 AM, Tomasz Figa <tomasz.figa at gmail.com> wrote:
>> > I would mostly agree with you if we were discussing SoC-internal
>> > components here. Mostly, because the ARM world is more complex and you
>> > can see the same IP across completely different SoCs from different
>> > vendors.
>> >
>> > However, the topic here is about external devices, outside the SoC, such
>> > as different kind of bridges, like the PTN3460 eDP to LVDS bridge, which
>> > are likely to be reused across different platforms. Similar thing is with
>> > using different bridges on different boards using the same SoC platform.
>> > I don't think having an abstraction here would be any overabstraction at
>> > all. Anything less would be a huge "underabstraction" in fact.
>>
>>
>> I think no one is arguing that we don't eventually need some better
>> abstraction.  But as long as it is one-bridge and one-user, if the
>> patches otherwise have merit, add functionality that was missing
>> before and don't regress, then lack of infrastructure to match up
>> bridge and driver isn't something I will care about too much yet.
>> Things are allowed to be in-progress.  A missing abstraction for a 1:1
>> relationship is fine.
>
> This is not just one-bridge, one-user. This is about users of Exynos DRM
> we already have in-tree, such as Trats, Trats2 or Arndale, that the DRM
> bridge infrastructure could be used on and finally allowing to have
> display support on them. Of course you could merge this as is and
> then let someone else completely rewrite it (most likely in the same
> release cycle), but since it's not really much more work, I don't
> think there is any sense.
>
> Moreover, let's stick to modern kernel driver coding standards. I don't
> think that "I want this patchset merged so badly" is really a good excuse
> to get around it. After all, there would be no GKH's staging tree, if
> nobody cared about quality in mainline.
>

I don't see how this change makes the code quality any worse, it's a
noop on boards without the bridge.

I proposed a general solution in v2, to which Laurent said he was
working on a patch. I didn't feel the need to do anything more general
here since it would be more work to rip it out later.

I am happy to pick up this work, however:
- I don't want to step on Laurent's toes
- It's probably more useful to have a general framework with 2 or more
bridges, so I don't think it should be a blocker on the ptn stuff

Sean



> Best regards,
> Tomasz
>
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