[Intel-gfx] [DVO][PATCH] drm/i915: Fall back to bit banging mode for DVO transmitter detection

[Daniel Vetter]

On Fri, Apr 19, 2013 at 12:54:00PM +0200, "David Müller (ELSOFT AG)" wrote:
> Daniel Vetter wrote:
> > On Fri, Apr 19, 2013 at 10:41:50AM +0200, "David Müller (ELSOFT AG)" wrote:
> >> +		/* GMBUS NAK handling seems to be unstable, hence let the
> >> +		 * transmitter detection run in bit banging mode for now.
> >> +		 */
> >> +		intel_gmbus_force_bit(i2c, true);
> >> +
> >> +		dvoinit = dvo->dev_ops->init(&intel_dvo->dev, i2c);
> >> +
> >> +		intel_gmbus_force_bit(i2c, false);
> > 
> > Shouldn't we keep the dvo i2c line in bit-banging mode always, i.e.
> > restore gmbus mode only when dvo init failed?
> > 
> > I suspect that for fickle hw not just init will fail ...
> 
> As far as i can tell, the critical part is the NAK handling.

Ok, I've merged the patch for 3.10 with cc: stable.

Thanks, Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch