linux-kernel - Re: [PATCH v3 0/9] Media Controller capture driver for DM365

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Date:	Wed, 28 Nov 2012 09:22:48 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Prabhakar Lad <prabhakar.csengg@...il.com>,
	Mauro Carvalho Chehab <mchehab@...hat.com>
Cc:	Hans Verkuil <hansverk@...co.com>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	LMML <linux-media@...r.kernel.org>, devel@...verdev.osuosl.org,
	DLOS <davinci-linux-open-source@...ux.davincidsp.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Prabhakar Lad <prabhakar.lad@...com>,
	Sakari Ailus <sakari.ailus@....fi>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Hans Verkuil <hans.verkuil@...co.com>,
	Manjunath Hadli <manjunath.hadli@...com>
Subject: Re: [PATCH v3 0/9] Media Controller capture driver for DM365

On Wed, Nov 28, 2012 at 10:18:02AM -0200, Mauro Carvalho Chehab wrote:
> Em Wed, 28 Nov 2012 12:56:10 +0100
> Hans Verkuil <hansverk@...co.com> escreveu:
> 
> > On Wed 28 November 2012 12:45:37 Dan Carpenter wrote:
> > > I wish people wouldn't submit big patches right before the merge
> > > window opens...  :/ It's better to let it sit in linux-next for a
> > > couple weeks so people can mess with it a bit.
> > 
> > It's been under review for quite some time now, and the main change since
> > the last posted version is that this is now moved to staging/media.
> > 
> > So it is not yet ready for prime time, but we do want it in to simplify
> > the last remaining improvements needed to move it to drivers/media.
> 
> "last remaining improvements"? I didn't review the patchset, but
> the TODO list seems to have several pending stuff there:
> 
> +- User space interface refinement
> +        - Controls should be used when possible rather than private ioctl
> +        - No enums should be used
> +        - Use of MC and V4L2 subdev APIs when applicable
> +        - Single interface header might suffice
> +        - Current interface forces to configure everything at once
> +- Get rid of the dm365_ipipe_hw.[ch] layer
> +- Active external sub-devices defined by link configuration; no strcmp
> +  needed
> +- More generic platform data (i2c adapters)
> +- The driver should have no knowledge of possible external subdevs; see
> +  struct vpfe_subdev_id
> +- Some of the hardware control should be refactorede
> +- Check proper serialisation (through mutexes and spinlocks)
> +- Names that are visible in kernel global namespace should have a common
> +  prefix (or a few)
> 
> From the above comments, both Kernelspace and Userspace APIs require 
> lots of work.
> 
> Also, it is not clear at all if this is a fork of the existing davinci
> driver, or if it is a completely new driver for an already-supported
> hardware, making very hard (if not impossible) to review it, and, if it
> is yet-another-driver for the same hardware, moving it out of staging
> will be a big issue, as it won't be trivial to check for regressions
> introduced by a different driver.
> 
> > 
> > I'm happy with this going in given the circumstances.
> 
> Well, I'm not.

Me either, it is way too late in the cycle to take huge stuff for 3.8,
sorry.

But as I don't manage drivers/staging/media/ there's not even anything I
can do here, it's Mauro's, so I'll leave it up to him :)

thanks,

greg k-h
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