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From:   Souptick Joarder <jrdr.linux@gmail.com>
Date:   Mon, 8 Oct 2018 21:57:52 +0530
Message-ID: <CAFqt6zZ9vZ8qDpockDyUgqxJxA-d6ajyufzBUCPzKkxv0Vnu_Q@mail.gmail.com>
Subject: Re: [PATCH] drm/rcar-du: Convert drm_atomic_helper_suspend/resume()
To:     noralf@tronnes.org
Cc:     Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
        Daniel Vetter <daniel@ffwll.ch>,
        Gustavo Padovan <gustavo@padovan.org>,
        Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
        sean@poorly.run, airlied@linux.ie, dri-devel@lists.freedesktop.org,
        linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org
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Sender: linux-kernel-owner@vger.kernel.org
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Hi Laurent,
On Mon, Oct 1, 2018 at 6:12 PM Noralf Tr=C3=B8nnes <noralf@tronnes.org> wro=
te:
>
>
> Den 01.10.2018 13.56, skrev Laurent Pinchart:
> > Hi Daniel,
> >
> > 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@gmail.com>
> >>>>> Laurent, any comment on this patch ??
> >>>> Sorry for the delay, and thanks for pinging me.
> >>>>
> >>>> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.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 Tr=C3=B8nn=
es nearly
> >>> a
> >>> year ago, and was later superseded by
> >>> https://patchwork.freedesktop.org/patch/247861/. I think we should th=
us
> >>> 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 exist=
ing
> >> 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 ? :-)

ers/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(-)
> >>>>>>
> >>>>>> diff --git a/drivers/gpu/drm/drm_fb_cma_helper.c
> >>>>>> b/drivers/gpu/drm/drm_fb_cma_helper.c index 47e0e2f..96efc88 10064=
4
> >>>>>> --- a/drivers/gpu/drm/drm_fb_cma_helper.c
> >>>>>> +++ b/drivers/gpu/drm/drm_fb_cma_helper.c
> >>>>>> @@ -224,21 +224,3 @@ void drm_fbdev_cma_hotplug_event(struct
> >>>>>> drm_fbdev_cma *fbdev_cma)
> >>>>>>
> >>>>>>                  drm_fb_helper_hotplug_event(&fbdev_cma->fb_helper=
);
> >>>>>>
> >>>>>>   }
> >>>>>>   EXPORT_SYMBOL_GPL(drm_fbdev_cma_hotplug_event);
> >>>>>>
> >>>>>> -
> >>>>>> -/**
> >>>>>> - * drm_fbdev_cma_set_suspend_unlocked - wrapper around
> >>>>>> - *
> >>>>>> drm_fb_helper_set_suspend_unlocked
> >>>>>> - * @fbdev_cma: The drm_fbdev_cma struct, may be NULL
> >>>>>> - * @state: desired state, zero to resume, non-zero to suspend
> >>>>>> - *
> >>>>>> - * Calls drm_fb_helper_set_suspend, which is a wrapper around
> >>>>>> - * fb_set_suspend implemented by fbdev core.
> >>>>>> - */
> >>>>>> -void drm_fbdev_cma_set_suspend_unlocked(struct drm_fbdev_cma
> >>>>>> *fbdev_cma,
> >>>>>> -                                       bool state)
> >>>>>> -{
> >>>>>> -       if (fbdev_cma)
> >>>>>> -
> >>>>>> drm_fb_helper_set_suspend_unlocked(&fbdev_cma->fb_helper,
> >>>>>> -                                                  state);
> >>>>>> -}
> >>>>>> -EXPORT_SYMBOL(drm_fbdev_cma_set_suspend_unlocked);
> >>>>>> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_drv.c
> >>>>>> b/drivers/gpu/drm/rcar-du/rcar_du_drv.c index 02aee6c..288220f 100=
644
> >>>>>> --- a/drivers/gpu/drm/rcar-du/rcar_du_drv.c
> >>>>>> +++ b/drivers/gpu/drm/rcar-du/rcar_du_drv.c
> >>>>>> @@ -357,32 +357,15 @@ static void rcar_du_lastclose(struct drm_dev=
ice
> >>>>>> *dev)
> >>>>>>
> >>>>>>   static int rcar_du_pm_suspend(struct device *dev)
> >>>>>>   {
> >>>>>>
> >>>>>>          struct rcar_du_device *rcdu =3D dev_get_drvdata(dev);
> >>>>>>
> >>>>>> -       struct drm_atomic_state *state;
> >>>>>>
> >>>>>> -       drm_kms_helper_poll_disable(rcdu->ddev);
> >>>>>> -       drm_fbdev_cma_set_suspend_unlocked(rcdu->fbdev, true);
> >>>>>> -
> >>>>>> -       state =3D drm_atomic_helper_suspend(rcdu->ddev);
> >>>>>> -       if (IS_ERR(state)) {
> >>>>>> -               drm_fbdev_cma_set_suspend_unlocked(rcdu->fbdev,
> >>>>>> false);
> >>>>>> -               drm_kms_helper_poll_enable(rcdu->ddev);
> >>>>>> -               return PTR_ERR(state);
> >>>>>> -       }
> >>>>>> -
> >>>>>> -       rcdu->suspend_state =3D state;
> >>>>>> -
> >>>>>> -       return 0;
> >>>>>> +       return drm_mode_config_helper_suspend(rcdu->ddev);
> >>>>>>
> >>>>>>   }
> >>>>>>
> >>>>>>   static int rcar_du_pm_resume(struct device *dev)
> >>>>>>   {
> >>>>>>
> >>>>>>          struct rcar_du_device *rcdu =3D dev_get_drvdata(dev);
> >>>>>>
> >>>>>> -       drm_atomic_helper_resume(rcdu->ddev, rcdu->suspend_state);
> >>>>>> -       drm_fbdev_cma_set_suspend_unlocked(rcdu->fbdev, false);
> >>>>>> -       drm_kms_helper_poll_enable(rcdu->ddev);
> >>>>>> -
> >>>>>> -       return 0;
> >>>>>> +       return drm_mode_config_helper_resume(rcdu->ddev);
> >>>>>>
> >>>>>>   }
> >>>>>>   #endif
> >>>>>>
> >>>>>> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_drv.h
> >>>>>> b/drivers/gpu/drm/rcar-du/rcar_du_drv.h index b3a25e8..ff25c8d 100=
644
> >>>>>> --- a/drivers/gpu/drm/rcar-du/rcar_du_drv.h
> >>>>>> +++ b/drivers/gpu/drm/rcar-du/rcar_du_drv.h
> >>>>>> @@ -78,7 +78,6 @@ struct rcar_du_device {
> >>>>>>
> >>>>>>          struct drm_device *ddev;
> >>>>>>          struct drm_fbdev_cma *fbdev;
> >>>>>>
> >>>>>> -       struct drm_atomic_state *suspend_state;
> >>>>>>
> >>>>>>          struct rcar_du_crtc crtcs[RCAR_DU_MAX_CRTCS];
> >>>>>>          unsigned int num_crtcs;
> >>>>>>
> >>>>>> diff --git a/include/drm/drm_fb_cma_helper.h
> >>>>>> b/include/drm/drm_fb_cma_helper.h index 4a65f0d..8dbbe1e 100644
> >>>>>> --- a/include/drm/drm_fb_cma_helper.h
> >>>>>> +++ b/include/drm/drm_fb_cma_helper.h
> >>>>>> @@ -26,8 +26,6 @@ struct drm_fbdev_cma *drm_fbdev_cma_init(struct
> >>>>>> drm_device *dev,
> >>>>>>
> >>>>>>   void drm_fbdev_cma_restore_mode(struct drm_fbdev_cma *fbdev_cma)=
;
> >>>>>>   void drm_fbdev_cma_hotplug_event(struct drm_fbdev_cma *fbdev_cma=
);
> >>>>>>
> >>>>>> -void drm_fbdev_cma_set_suspend_unlocked(struct drm_fbdev_cma
> >>>>>> *fbdev_cma,
> >>>>>> -                                       bool state);
> >>>>>>
> >>>>>>   struct drm_gem_cma_object *drm_fb_cma_get_gem_obj(struct
> >>>>>>   drm_framebuffer *fb,
> >>>>>>
> >>>>>>          unsigned int plane);
>