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Date:   Tue, 23 Oct 2018 15:42:02 +0200
From:   Daniel Vetter <daniel@ffwll.ch>
To:     Eugeniy Paltsev <eugeniy.paltsev@synopsys.com>
Cc:     "dri-devel@lists.freedesktop.org" <dri-devel@lists.freedesktop.org>,
        "airlied@linux.ie" <airlied@linux.ie>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "daniel.vetter@ffwll.ch" <daniel.vetter@ffwll.ch>,
        "linux-snps-arc@lists.infradead.org" 
        <linux-snps-arc@lists.infradead.org>,
        "stable@vger.kernel.org" <stable@vger.kernel.org>,
        "marcheu@chromium.org" <marcheu@chromium.org>,
        Alexey Brodkin <alexey.brodkin@synopsys.com>,
        "maarten.lankhorst@linux.intel.com" 
        <maarten.lankhorst@linux.intel.com>,
        "gustavo@padovan.org" <gustavo@padovan.org>,
        "sean@poorly.run" <sean@poorly.run>
Subject: Re: [PATCH] DRM: UDL: get rid of useless vblank initialization
Message-ID: <20181023134202.GP324@phenom.ffwll.local>
Mail-Followup-To: Eugeniy Paltsev <eugeniy.paltsev@synopsys.com>,
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        "stable@vger.kernel.org" <stable@vger.kernel.org>,
        "marcheu@chromium.org" <marcheu@chromium.org>,
        Alexey Brodkin <alexey.brodkin@synopsys.com>,
        "maarten.lankhorst@linux.intel.com" <maarten.lankhorst@linux.intel.com>,
        "gustavo@padovan.org" <gustavo@padovan.org>,
        "sean@poorly.run" <sean@poorly.run>
References: <20180928144126.21598-1-Eugeniy.Paltsev@synopsys.com>
 <1540292472.19916.13.camel@synopsys.com>
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On Tue, Oct 23, 2018 at 11:01:14AM +0000, Eugeniy Paltsev wrote:
> Hi David,
> 
> Maybe you have any comments or remarks about this patch?
> And if you don't could you please apply it. Thanks!

Hm I hoped Sean would pick this up. I stuffed it into drm-misc-next now,
and Sean owes me one. Generally pinging Dave is a last resort in dri-devel
(and doesn't work too well).

Thanks for your patch.
-Daniel
> 
> On Fri, 2018-09-28 at 17:41 +0300, Eugeniy Paltsev wrote:
> > UDL doesn't support vblank functionality so we don't need to
> > initialize vblank here (we are able to send page flip
> > completion events even without vblank initialization)
> > 
> > Moreover current drm_vblank_init call with num_crtcs > 0 causes
> > sending DRM_EVENT_FLIP_COMPLETE event with zero timestamp every
> > time. This breaks userspace apps (for example weston) which
> > relies on timestamp value.
> > 
> > Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> > Cc: stable@vger.kernel.org
> > Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
> > ---
> >  drivers/gpu/drm/udl/udl_main.c | 7 +------
> >  1 file changed, 1 insertion(+), 6 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/udl/udl_main.c b/drivers/gpu/drm/udl/udl_main.c
> > index f455f095a146..1b014d92855b 100644
> > --- a/drivers/gpu/drm/udl/udl_main.c
> > +++ b/drivers/gpu/drm/udl/udl_main.c
> > @@ -350,15 +350,10 @@ int udl_driver_load(struct drm_device *dev, unsigned long flags)
> >  	if (ret)
> >  		goto err;
> >  
> > -	ret = drm_vblank_init(dev, 1);
> > -	if (ret)
> > -		goto err_fb;
> > -
> >  	drm_kms_helper_poll_init(dev);
> >  
> >  	return 0;
> > -err_fb:
> > -	udl_fbdev_cleanup(dev);
> > +
> >  err:
> >  	if (udl->urbs.count)
> >  		udl_free_urb_list(dev);
> -- 
>  Eugeniy Paltsev

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch