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Date:   Mon, 15 Aug 2022 08:22:46 +0300
From:   Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To:     Sergey Senozhatsky <senozhatsky@chromium.org>
Cc:     Greg KH <gregkh@linuxfoundation.org>,
        Paul Menzel <pmenzel@molgen.mpg.de>,
        Wang Yating <yating.wang@intel.com>,
        Christoph Jechlitschek <christoph.jechlitschek@intel.com>,
        Hao Yao <hao.yao@intel.com>, Andy Yeh <andy.yeh@intel.com>,
        Sakari Ailus <sakari.ailus@linux.intel.com>,
        Bingbu Cao <bingbu.cao@intel.com>,
        Tianshu Qiu <tian.shu.qiu@intel.com>,
        linux-media@vger.kernel.org, Mark Pearson <markpearson@lenovo.com>,
        Dell.Client.Kernel@dell.com, linux-kernel@vger.kernel.org,
        Guenter Roeck <groeck@google.com>,
        Andy Whitcroft <apw@canonical.com>,
        Kai-Heng Feng <kai.heng.feng@canonical.com>,
        Christian Schaller <cschalle@redhat.com>,
        Wouter Bolsterlee <wouter@bolsterl.ee>,
        Miguel Palhas <mpalhas@gmail.com>, it+linux-media@molgen.mpg.de
Subject: Re: Missing MIPI IPU6 camera driver for Intel Alder Lake laptops
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Hi Sergei,

On Mon, Aug 15, 2022 at 11:06:39AM +0900, Sergey Senozhatsky wrote:
> On (22/08/11 17:30), Greg KH wrote:
> > On Thu, Aug 11, 2022 at 06:08:55PM +0300, Laurent Pinchart wrote:
> > > On Thu, Aug 11, 2022 at 05:02:40PM +0200, Greg KH wrote:
> > > > On Thu, Aug 11, 2022 at 04:54:53PM +0300, Laurent Pinchart wrote:
> > > > > For the time being, I agree with your recommendation to not buy these
> > > > > devices if you care about camera support.
> > > > 
> > > > I second this, don't buy these devices if the vendor is not willing to
> > > > get their drivers upstreamed properly.
> > > 
> > > "Not willing" may be a bit too harsh here. I wouldn't just blame Intel
> > > for not upstreaming a driver if it turns out that the V4L2 API isn't a
> > > good match and we have no proposal to provide an alternative.
> > 
> > Did they propose an alternative?  From what I saw here they didn't even
> > attempt it, or did I miss that?
> 
> The plan here is to land CAM kernel API first and then switch IPU
> (driver and user-space) to it so that upstreaming for Intel will
> be easier.

In its current form, that API will likely have trouble going upstream.
Reception wasn't exactly positive in the mainline kernel community. I
would like to restate my recommendation of sitting down with the
upstream community around the same (virtual) table to design an that
will be suitable for the upstream kernel.

-- 
Regards,

Laurent Pinchart