linux-kernel - Re: [PATCH v2] drm/arcpgu: Accommodate adv7511 switch to DRM bridge

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Date:   Thu, 10 Nov 2016 11:06:40 +0000
From:   Alexey Brodkin <Alexey.Brodkin@...opsys.com>
To:     "airlied@...hat.com" <airlied@...hat.com>,
        "daniel.vetter@...ll.ch" <daniel.vetter@...ll.ch>
CC:     "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "architt@...eaurora.org" <architt@...eaurora.org>,
        "Ramiro.Oliveira@...opsys.com" <Ramiro.Oliveira@...opsys.com>,
        "Eugeniy.Paltsev@...opsys.com" <Eugeniy.Paltsev@...opsys.com>,
        "airlied@...ux.ie" <airlied@...ux.ie>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>
Subject: Re: [PATCH v2] drm/arcpgu: Accommodate adv7511 switch to DRM bridge

Hi Daniel, David,

On Wed, 2016-11-02 at 12:23 +0000, Alexey Brodkin wrote:
> Hi Daniel, David,
> 
> On Mon, 2016-10-24 at 18:33 +0000, Alexey Brodkin wrote:
> > 
> > Hi Daniel,
> > 
> > > 
> > > 
> > > -----Original Message-----
> > > From: linux-snps-arc [mailto:linux-snps-arc-bounces@...ts.infradead.org] On Behalf Of Alexey Brodkin
> > > Sent: 19 октября 2016 г. 12:33
> > > To: dri-devel@...ts.freedesktop.org; architt@...eaurora.org; Eugeniy.Paltsev@...opsys.com
> > > Cc: linux-snps-arc@...ts.infradead.org; linux-kernel@...r.kernel.org
> > > Subject: Re: [PATCH v2] drm/arcpgu: Accommodate adv7511 switch to DRM bridge
> > > 
> > > Hi Archit, all,
> > > 
> > > On Wed, 2016-10-19 at 14:43 +0530, Archit Taneja wrote:
> > > > 
> > > > 
> > > > 
> > > > On 10/19/2016 01:16 PM, Eugeniy Paltsev wrote:
> > > > > 
> > > > > 
> > > > > 
> > > > > ARC PGU driver starts crashing on initialization after
> > > > > 'commit e12c2f645557 ("drm/i2c: adv7511: Convert to drm_bridge")'
> > > > > This happenes because in "arcpgu_drm_hdmi_init" function we get pointer
> > > > > of "drm_i2c_encoder_driver" structure, which doesn't exist after
> > > > > adv7511 hdmi encoder interface changed from slave encoder to drm bridge.
> > > > > So, when we call "encoder_init" function from this structure driver
> > > > > crashes.
> > > 
> > > [snip]
> > > 
> > > > 
> > > > 
> > > > Looks good now.
> > > > 
> > > > Reviewed-by: Archit Taneja <architt@...eaurora.org>
> > > 
> > > And IMHO it would be really good to get this one back-ported to 4.8
> > > because it really fixes kernel crash if ARC PGU driver is used.
> > > 
> > > It might be a bit of a problem because patch itself a little-bit larger
> > > than formal requirement for stable backports but let's see if it gets accepted.
> > 
> > Could you please pick this one up?
> > I may alternatively send a pull-request to David but not sure if 1 patch worth it.
> > 
> > Also if that's not really too late it would be good to get this one in 4.9 since the patch
> > In question fixes a real driver crash on its instantiation.
> > Actually driver crash happens since 4.8 but I failed to notice it earlier and given amount
> > of changes I think there's barely a chance for it it to be accepted in stable branches...
> > which in its turn makes at least 4.9 very desirable.
> 
> Any chance this one gets accepted anytime soon?

Please treat this as another polite reminder to apply this patch.
If you prefer I may send a pull-request otherwise.

Regards,
Alexey