linux-kernel - Re: [PATCH] drm/rcar-du: Convert drm_atomic_helper

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Date:   Tue, 23 Oct 2018 17:15:27 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Daniel Vetter <daniel@...ll.ch>
Cc:     Souptick Joarder <jrdr.linux@...il.com>, noralf@...nnes.org,
        Gustavo Padovan <gustavo@...ovan.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        sean@...rly.run, airlied@...ux.ie, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, linux-renesas-soc@...r.kernel.org
Subject: Re: [PATCH] drm/rcar-du: Convert drm_atomic_helper_suspend/resume()

Hi Daniel,

On Tuesday, 23 October 2018 16:40:41 EEST Daniel Vetter wrote:
> On Mon, Oct 22, 2018 at 01:51:35PM +0530, Souptick Joarder wrote:
> > On Thu, Oct 11, 2018 at 1:48 PM Daniel Vetter <daniel@...ll.ch> wrote:
> >> On Mon, Oct 08, 2018 at 09:57:52PM +0530, Souptick Joarder wrote:
> >>> On Mon, Oct 1, 2018 at 6:12 PM Noralf Trønnes wrote:
> >>>> Den 01.10.2018 13.56, skrev Laurent Pinchart:
> >>>>> On Monday, 1 October 2018 09:52:20 EEST Daniel Vetter wrote:
> >>>>>> On Fri, Sep 28, 2018 at 06:30:35PM +0300, Laurent Pinchart wrote:
> >>>>>>> On Friday, 28 September 2018 18:05:18 EEST Laurent Pinchart wrote:
> >>>>>>>> On Thursday, 27 September 2018 09:34:18 EEST Souptick Joarder 
wrote:
> >>>>>>>>> On Tue, Sep 18, 2018 at 10:05 PM Souptick Joarder wrote:
> >>>>>>>>>> convert drm_atomic_helper_suspend/resume() to use
> >>>>>>>>>> drm_mode_config_helper_suspend/resume().
> >>>>>>>>>> 
> >>>>>>>>>> remove suspend_state field from the rcar_du_device
> >>>>>>>>>> structure as it is no more required.
> >>>>>>>>>> 
> >>>>>>>>>> With this conversion, also
> >>>>>>>>>> drm_fbdev_cma_set_suspend_unlocked()
> >>>>>>>>>> will left with no consumer. So this function can be removed.
> >>>>>>>>>> 
> >>>>>>>>>> Signed-off-by: Souptick Joarder <jrdr.linux@...il.com>
> >>>>>>>>> 
> >>>>>>>>> Laurent, any comment on this patch ??
> >>>>>>>> 
> >>>>>>>> Sorry for the delay, and thanks for pinging me.
> >>>>>>>> 
> >>>>>>>> Reviewed-by: Laurent Pinchart
> >>>>>>>> <laurent.pinchart@...asonboard.com>
> >>>>>>>> 
> >>>>>>>> Should I apply this to my tree or do you plan to merge it
> >>>>>>>> through drm-misc as it touches drm_fb_cma_helper.c ?
> >>>>>>> 
> >>>>>>> I just realized that the same patch got supplied by Noralf
> >>>>>>> Trønnes nearly a year ago, and was later superseded by
> >>>>>>> https://patchwork.freedesktop.org/patch/247861/. I think we
> >>>>>>> should thus apply Noralf's patches instead (once he sends v4
> >>>>>>> out).
> >>>>>> 
> >>>>>> I don't think Noralf is still actively working on this, he's busy
> >>>>>> with the fbdev emulation stuff. Probably better if you pick up
> >>>>>> one of the existing ones, than waiting another year or so :-)
> >>>>> 
> >>>>> Isn't https://patchwork.freedesktop.org/patch/247861/ part of the
> >>>>> fbdev emulation stuff ? That patch series is from less than a
> >>>>> month ago, so I thought it was actively developed.
> >>>>> 
> >>>>> Let's ask him. Noralf, any comment ? :-)
> >>>> 
> >>>> I see now that I've caused some confusion here.
> >>>> 
> >>>> I did some refactoring of the fbdev stuff in the CMA helper last
> >>>> year. In the last series of that work there is this patch:
> >>>> 
> >>>> [v3,07/11] drm/rcar-du: Use drm_mode_config_helper_suspend/resume()
> >>>> https://patchwork.freedesktop.org/patch/192414/
> >>>> 
> >>>> During Christmas I got the idea that maybe it was possible to use a
> >>>> dumb buffer to do generic fbdev emulation. That work took me 6
> >>>> months before a solution using a general internal DRM client was
> >>>> hammered out. By the time I started to convert drivers I had
> >>>> forgotten about that patch.
> >>>> 
> >>>> When I wrote the patch (#247861) to convert rcar to the generic
> >>>> fbdev, I just bundled up the suspend/resume change with the fbdev
> >>>> conversion. Laurent and Sam commented on that bundling, so I said
> >>>> that I would split it up in the next version.
> >>>> 
> >>>> All that being said, I think that this patch should be applied and
> >>>> I'll just rebase the rcar fbdev conversion patch on top of that.
> >>>> It's the easiest for me at least :-)
> >>> 
> >>> Any conclusion on this patch ? :-)
> >> 
> >> Laurent should pick it up and apply to his rcar-du tree I think. We can
> >> also stuff it into drm-misc as a fallback.
> > 
> > Can we get this patch in queue for 4.20 ?
> 
> 5.1, 4.20 is already done.
> 
> But yes, I pulled this into drm-misc-next. Thanks for your patch.

I would have preferred applying this through my tree. I'm currently at ELCE 
and had to prepare for the conference, hence the delay.

> >>>>>>>>>>   drivers/gpu/drm/drm_fb_cma_helper.c   | 18 ------------------
> >>>>>>>>>>   drivers/gpu/drm/rcar-du/rcar_du_drv.c | 21 ++-----------------
> >>>>>>>>>>   drivers/gpu/drm/rcar-du/rcar_du_drv.h |  1 -
> >>>>>>>>>>   include/drm/drm_fb_cma_helper.h       |  2 --
> >>>>>>>>>>   4 files changed, 2 insertions(+), 40 deletions(-)

-- 
Regards,

Laurent Pinchart