linux-kernel - Re: [PATCH 32/33] staging/olpc_dcon: Add drm conversion to TODO

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Message-ID: <20190527071126.GL21222@phenom.ffwll.local>
Date:   Mon, 27 May 2019 09:11:26 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     LKML <linux-kernel@...r.kernel.org>,
        Greg KH <gregkh@...uxfoundation.org>
Cc:     Intel Graphics Development <intel-gfx@...ts.freedesktop.org>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Jens Frederich <jfrederich@...il.com>,
        Daniel Drake <dsd@...top.org>,
        Jon Nettleton <jon.nettleton@...il.com>
Subject: Re: [PATCH 32/33] staging/olpc_dcon: Add drm conversion to TODO

On Fri, May 24, 2019 at 10:53:53AM +0200, Daniel Vetter wrote:
> this driver is pretty horrible from a design pov, and needs a complete
> overhaul. Concrete thing that annoys me is that it looks at
> registered_fb, which is an internal thing to fbmem.c and fbcon.c. And
> ofc it gets the lifetime rules all wrong (it should at least use
> get/put_fb_info).
> 
> Looking at the history, there's been an attempt at dropping this from
> staging in 2016, but that had to be reverted. Since then not real
> effort except the usual stream of trivial patches, and fbdev has been
> formally closed for any new hw support. Time to try again and drop
> this?
> 
> Signed-off-by: Daniel Vetter <daniel.vetter@...el.com>
> Cc: Jens Frederich <jfrederich@...il.com>
> Cc: Daniel Drake <dsd@...top.org>
> Cc: Jon Nettleton <jon.nettleton@...il.com>

Hi Greg

Again get_mainatiners didn't pick you up on this somehow (I manually added
you now for the next round). Do you want to pick this up to staging, or
ack for merging through drm/fbdev as part of the larger fbdev/fbcon
rework?

Also, I think time to retry and attempt at dropping this imo ...

Thanks, Daniel

> ---
>  drivers/staging/olpc_dcon/TODO | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/staging/olpc_dcon/TODO b/drivers/staging/olpc_dcon/TODO
> index 665a0b061719..fe09efbc7f77 100644
> --- a/drivers/staging/olpc_dcon/TODO
> +++ b/drivers/staging/olpc_dcon/TODO
> @@ -1,4 +1,11 @@
>  TODO:
> +	- complete rewrite:
> +	  1. The underlying fbdev drivers need to be converted into drm kernel
> +	     modesetting drivers.
> +	  2. The dcon low-power display mode can then be integrated using the
> +	     drm damage tracking and self-refresh helpers.
> +	  This bolted-on self-refresh support that digs around in fbdev
> +	  internals, but isn't properly integrated, is not the correct solution.
>  	- see if vx855 gpio API can be made similar enough to cs5535 so we can
>  	  share more code
>  	- convert all uses of the old GPIO API from <linux/gpio.h> to the
> -- 
> 2.20.1
> 

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