linux-kernel - Re: [PATCH v2 0/3] drm: introduce bus

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Message-ID: <1456309726.3396.31.camel@pengutronix.de>
Date:	Wed, 24 Feb 2016 11:28:46 +0100
From:	Philipp Zabel <p.zabel@...gutronix.de>
To:	Stefan Agner <stefan@...er.ch>
Cc:	dri-devel@...ts.freedesktop.org, thierry.reding@...il.com,
	airlied@...ux.ie, daniel.vetter@...ll.ch,
	jianwei.wang.chn@...il.com, alison.wang@...escale.com,
	meng.yi@....com, linux@....linux.org.uk, denis@...rea.com,
	eric@...rea.com, ville.syrjala@...ux.intel.com,
	linux-kernel@...r.kernel.org, manfred.schlaegl@....at,
	tomi.valkeinen@...com, boris.brezillon@...e-electrons.com
Subject: Re: [PATCH v2 0/3] drm: introduce bus_flags for pixel clock polarity

Am Dienstag, den 23.02.2016, 15:30 -0800 schrieb Stefan Agner:
> Any comments on this?

None other that I'm all in favor. consider patch 2
Acked-by: Philipp Zabel <p.zabel@...gutronix.de>

> Also added Manfred, Tomi and Boris to CC which previously attended in
> similar discussions.
> 
> Previous discussions:
> http://thread.gmane.org/gmane.linux.kernel.api/12830
> http://thread.gmane.org/gmane.comp.video.dri.devel/96240/
> 
> I think one of the main observation so far was that the pixel clock
> polarity is not a property of the mode, and therefor does not fit into
> the DRM_MODE_FLAG. This has been pointed out nicely by Russel:
> http://thread.gmane.org/gmane.comp.video.dri.devel/96240/focus=96260
> 
> Embedded displays connected through parallel bus make use of the
> bus_formats field in drm_display_mode. This field defines what kind of
> bus format the display requires. This patch follows that idea and adds
> bus_flags. bus_flags can be used to define specific bus properties
> required by the display, such as pixel clock or data enable polarity...

regards
Philipp