linux-kernel - Re: [PATCH v2 1/3] drm/fsl-dcu: use mode flags for hsync/vsync polarity

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Date:	Thu, 25 Feb 2016 17:48:27 +0100
From:	Thierry Reding <thierry.reding@...il.com>
To:	Stefan Agner <stefan@...er.ch>
Cc:	dri-devel@...ts.freedesktop.org, airlied@...ux.ie,
	daniel.vetter@...ll.ch, jianwei.wang.chn@...il.com,
	alison.wang@...escale.com, meng.yi@....com, linux@....linux.org.uk,
	p.zabel@...gutronix.de, denis@...rea.com, eric@...rea.com,
	ville.syrjala@...ux.intel.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] drm/fsl-dcu: use mode flags for hsync/vsync
 polarity

On Mon, Feb 08, 2016 at 01:57:41PM -0800, Stefan Agner wrote:
> The current default configuration is as follows:
> - Invert VSYNC signal (active LOW)
> - Invert HSYNC signal (active LOW)
> 
> The mode flags allow to specify the required polarity per
> mode. Furthermore, none of the current driver settings is
> actually a standard polarity.
> 
> This patch applies the current driver default polarities as
> explicit flags to the display which has been introduced with
> the driver (NEC WQVGA "nec,nl4827hc19-05b"). The driver now
> also parses the flags field and applies the configuration
> accordingly, by using the following values as standard
> polarities: (e.g. when no flags are specified):
> - VSYNC signal not inverted (active HIGH)
> - HSYNC signal not inverted (active HIGH)
> 
> Signed-off-by: Stefan Agner <stefan@...er.ch>
> ---
>  drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_crtc.c | 11 ++++++++---
>  drivers/gpu/drm/panel/panel-simple.c       |  1 +
>  2 files changed, 9 insertions(+), 3 deletions(-)

Acked-by: Thierry Reding <treding@...dia.com>

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