linux-kernel - Re: [PATCH v3 07/24] drm/i2c: tda998x: set the video mode from the adjusted value

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Date:	Tue, 28 Jan 2014 18:12:18 +0100
From:	Jean-Francois Moine <moinejf@...e.fr>
To:	Darren Etheridge <detheridge@...com>
Cc:	<dri-devel@...ts.freedesktop.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <balbi@...com>
Subject: Re: [PATCH v3 07/24] drm/i2c: tda998x: set the video mode from the
 adjusted value

On Thu, 23 Jan 2014 17:29:07 -0600
Darren Etheridge <detheridge@...com> wrote:

> > @@ -896,9 +897,9 @@ tda998x_encoder_mode_set(struct drm_encoder *encoder,
> >  	 * TDA19988 requires high-active sync at input stage,
> >  	 * so invert low-active sync provided by master encoder here
> >  	 */
> > -	if (mode->flags & DRM_MODE_FLAG_NHSYNC)
> > +	if (adj_mode->flags & DRM_MODE_FLAG_NHSYNC)
> >  		reg_set(priv, REG_VIP_CNTRL_3, VIP_CNTRL_3_H_TGL);
> > -	if (mode->flags & DRM_MODE_FLAG_NVSYNC)
> > +	if (adj_mode->flags & DRM_MODE_FLAG_NVSYNC)
> >  		reg_set(priv, REG_VIP_CNTRL_3, VIP_CNTRL_3_V_TGL);
> >    
> 
> Using the adj_mode->flags breaks a workaround I had done on BeagleBone Black
> (tilcdc + tda998x) to resolve an issue with out of spec syncs from the
> tlcdc.  I invert the HSYNC in adj_mode->flags but don't want the tda998x to
> really know that I am doing that so I use adj_mode in the tilcdc driver, and
> mode here in the tda998x driver.  The theory being adj_mode contains whatever
> workarounds I need to do for the driving device and mode has the pristine
> values that I want to send to the monitor.  I would need to look if there is a
> different way to solve this as I am guessing you are actually using adj_mode in
> the manner it was intended.

No. In fact, I just wanted the function to use only one mode.

Looking at the other drivers, it seems that they don't touch the
adjusted_mode, so, for the Cubox, mode and adjusted_mode have same
values.

I will do an other patch so that you will not have to touch the tilcdc
driver.

-- 
Ken ar c'hentañ	|	      ** Breizh ha Linux atav! **
Jef		|		http://moinejf.free.fr/
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