[Intel-gfx] [RFC 07/14] drm/i915: Disable MIPI display self refresh mode

[Daniel Vetter]

On Fri, May 29, 2015 at 07:16:36PM +0200, Daniel Vetter wrote:
> On Fri, May 29, 2015 at 04:06:59PM +0530, Gaurav K Singh wrote:
> > During disable sequence for MIPI encoder in command mode, disable
> > MIPI display self-refresh mode bit in Pipe Ctrl reg.
> > 
> > Signed-off-by: Gaurav K Singh <gaurav.k.singh at intel.com>
> > Signed-off-by: Yogesh Mohan Marimuthu <yogesh.mohan.marimuthu at intel.com>
> > Signed-off-by: Shobhit Kumar <shobhit.kumar at intel.com>
> > ---
> >  drivers/gpu/drm/i915/intel_display.c |   13 +++++++++++++
> >  1 file changed, 13 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> > index 895d7c7..cab2ac8 100644
> > --- a/drivers/gpu/drm/i915/intel_display.c
> > +++ b/drivers/gpu/drm/i915/intel_display.c
> > @@ -2171,6 +2171,9 @@ static void intel_enable_pipe(struct intel_crtc *crtc)
> >  static void intel_disable_pipe(struct intel_crtc *crtc)
> >  {
> >  	struct drm_i915_private *dev_priv = crtc->base.dev->dev_private;
> > +	struct intel_encoder *encoder;
> > +	struct intel_dsi *intel_dsi;
> > +	struct drm_device *dev = crtc->base.dev;
> >  	enum transcoder cpu_transcoder = crtc->config->cpu_transcoder;
> >  	enum pipe pipe = crtc->pipe;
> >  	int reg;
> > @@ -2189,6 +2192,16 @@ static void intel_disable_pipe(struct intel_crtc *crtc)
> >  	if ((val & PIPECONF_ENABLE) == 0)
> >  		return;
> >  
> > +	for_each_encoder_on_crtc(dev, &crtc->base, encoder) {
> > +		if (encoder->type == INTEL_OUTPUT_DSI) {
> > +			intel_dsi = enc_to_intel_dsi(&encoder->base);
> > +			if (intel_dsi && (intel_dsi->operation_mode ==
> > +						INTEL_DSI_COMMAND_MODE))
> > +				val = val & ~PIPECONF_MIPI_DSR_ENABLE;
> > +			break;
> > +		}
> > +	}
> 
> This must be moved into a suitable encoder callback. Yes the ddi code is
> full of cases where encoder stuff is done from the generic crtc code. But
> we now have 2 completely different kinds of ports on bxt (ddi and dsi),
> and we need to get some solid structure into the code again.

Ah I missed that this is a pipeconf thing. Unconditionally clearing this
bit will achieve the same, without the need to loop over connectors.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch