linux-kernel - Re: [PATCH 0/2] drm: dw-hdmi: various improvements

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Message-ID: <20170410120844.3czcqwjsyzmkznhp@phenom.ffwll.local>
Date:   Mon, 10 Apr 2017 14:08:44 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Neil Armstrong <narmstrong@...libre.com>
Cc:     Russell King - ARM Linux <linux@...linux.org.uk>,
        Archit Taneja <architt@...eaurora.org>,
        Jose Abreu <Jose.Abreu@...opsys.com>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-rockchip@...ts.infradead.org,
        Romain Perier <romain.perier@...labora.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 0/2] drm: dw-hdmi: various improvements

On Mon, Apr 10, 2017 at 12:35:43PM +0200, Neil Armstrong wrote:
> On 04/10/2017 12:08 PM, Russell King - ARM Linux wrote:
> > On Mon, Apr 10, 2017 at 10:49:18AM +0530, Archit Taneja wrote:
> >> Hi,
> >>
> >> On 04/07/2017 07:49 PM, Romain Perier wrote:
> >>> This set of patches split the stream handling functions in two parts. It
> >>> introduces new callbacks that are specific to each variant, one for I2S
> >>> and one for AHB.
> >>>
> >>> Then, as requested by the datasheet for the I2S variant, it adds support
> >>> for gating the audio sampler clock when the audio stream is enabled and
> >>> disabled.
> >>>
> >>> This patches series is the continuity of the following discussion:
> >>> http://lists.infradead.org/pipermail/linux-arm-kernel/2017-March/493550.html
> >>
> >> Since these aren't fixes, could you make sure to redo the patches over:
> >>
> >> git://anongit.freedesktop.org/drm-misc drm-misc-next
> >>
> >> The dw-hdmi driver is now under drivers/gpu/drm/bridge/synopsis/
> > 
> > This is annoying as it makes submission of CEC support for dw-hdmi
> > rather difficult due to the now horrid cross-tree dependencies:
> > 
> > * if I submit it to the DRM tree, the DRM tree will build break because
> >   you don't have the necessary CEC changes which have recently been
> >   merged into the media tree.
> > 
> > * if I submit it to the media tree, the new files will be placed into
> >   drivers/gpu/drm/bridge and when stuff gets merged into linux-next
> >   and/or Linus' tree, things will need quite a large fixup (someone
> >   will have to rename the files and fix the Kconfig/Makefiles.)
> > 
> > So, I'll hold it back for another cycle to avoid the mess that would
> > result from trying to get it merged during this cycle.
> > 
> 
> Hi Russell,
> 
> Cross tree with media has already been done on this cycle with the
> dw-hdmi formats changes.
> 
> Nevertheless, please push your updated dw-hdmi cec patchset for tests
> and review based on the latest drm-misc-next and hverkuil's HPD notifier
> release.
> 
> I would like to run it on some Amlogic boards.

Yeah, cross subsystem topic branches aren't rocket science, we have the
entire process documented and scripted on the drm side. Hairy depencies
really aren't a reason to not submit patches, we've got this :-)

But 4.12 is done anyway on the drm side, so will get delayed to 4.13 no
matter what. Still would be good to get the patches reviewed as early as
possible.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch