[Intel-gfx] [PATCH 3/8] Port ready checks for vlv

[Jesse Barnes]

On Thu, 18 Apr 2013 21:35:12 +0200
Daniel Vetter <daniel at ffwll.ch> wrote:

> On Thu, Apr 18, 2013 at 10:46:10AM +0200, Daniel Vetter wrote:
> > Since Paulo's hdmi/dp encoder rework we have the port number ready
> > at hand, so no need to do ugly hardcoding like that. Also, there's
> > the ->pre_enable hook right above waiting to be used.
> > 
> > Please encapsulate this into a vlv_check_dpll_port_ready(dev_priv, port)
> > or so and call it from hdmi/dp_pre_enable functions.
> > ---
> >  drivers/gpu/drm/i915/intel_display.c |   17 +++++++++++++++++
> >  1 file changed, 17 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> > index c124dba..86c4b6d 100644
> > --- a/drivers/gpu/drm/i915/intel_display.c
> > +++ b/drivers/gpu/drm/i915/intel_display.c
> > @@ -3866,6 +3866,23 @@ static void i9xx_crtc_enable(struct drm_crtc *crtc)
> >  		if (encoder->pre_enable)
> >  			encoder->pre_enable(encoder);
> >  
> > +	if (IS_VALLEYVIEW(dev)) {
> > +		char port;
> > +
> > +		if (intel_pipe_has_type(crtc, INTEL_OUTPUT_HDMI) ||
> > +		    intel_pipe_has_type(crtc, INTEL_OUTPUT_DISPLAYPORT)) {
> > +			port_mask = DPLL_PORTB_READY_MASK;
> > +			port = 'B';
> > +		} else {
> > +			port_mask = DPLL_PORTC_READY_MASK; /* eDP on port C */
> > +			port = 'C';
> > +		}
> > +
> > +		if (wait_for((I915_READ(DPLL(0)) & port_mask) == 0, 1000))
> > +			WARN(1, "timed out waiting for port %c ready: 0x%08x\n",
> > +			     port, I915_READ(DPLL(0)));
> 
> DPLL(crtc->pipe) instead?

Nope, DPLL 0 has the status bits for both ports in the low bits.

-- 
Jesse Barnes, Intel Open Source Technology Center