[Intel-gfx] [RFC 2/7] drm/i915/dsi: Configure transcoder operation for command mode.

[Kulkarni, Vandita]

> -----Original Message-----
> From: Jani Nikula <jani.nikula at intel.com>
> Sent: Thursday, October 24, 2019 5:08 PM
> To: Kulkarni, Vandita <vandita.kulkarni at intel.com>; intel-
> gfx at lists.freedesktop.org
> Cc: ville.syrjala at linux.intel.com; Shankar, Uma <uma.shankar at intel.com>;
> Kulkarni, Vandita <vandita.kulkarni at intel.com>
> Subject: Re: [RFC 2/7] drm/i915/dsi: Configure transcoder operation for
> command mode.
> 
> On Mon, 14 Oct 2019, Vandita Kulkarni <vandita.kulkarni at intel.com> wrote:
> > Configure the transcoder to operate in TE GATE command mode and  take
> > TE events from GPIO.
> > Also disable the periodic command mode, that GOP would have
> > programmed.
> 
> Discussing this with Ville, it just might be a good idea to enable command
> mode *with* the periodic update first. It dodges a bunch of issues wrt
> vblanks and scanlines, yet moves us forward with command mode. So it
> might be a viable intermediate step.
That would mean enable vblank and not get TE. I will check with this.

Thanks,
Vandita
> 
> BR,
> Jani.
> 
> >
> > Signed-off-by: Vandita Kulkarni <vandita.kulkarni at intel.com>
> > ---
> >  drivers/gpu/drm/i915/display/icl_dsi.c | 32
> > ++++++++++++++++++++++++++
> >  1 file changed, 32 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/i915/display/icl_dsi.c
> > b/drivers/gpu/drm/i915/display/icl_dsi.c
> > index 6e398c33a524..8e6c09a1db78 100644
> > --- a/drivers/gpu/drm/i915/display/icl_dsi.c
> > +++ b/drivers/gpu/drm/i915/display/icl_dsi.c
> > @@ -704,6 +704,10 @@ gen11_dsi_configure_transcoder(struct
> intel_encoder *encoder,
> >  				tmp |= VIDEO_MODE_SYNC_PULSE;
> >  				break;
> >  			}
> > +		} else {
> > +			tmp &= ~OP_MODE_MASK;
> > +			tmp |= CMD_MODE_TE_GATE;
> > +			tmp |= TE_SOURCE_GPIO;
> >  		}
> >
> >  		I915_WRITE(DSI_TRANS_FUNC_CONF(dsi_trans), tmp); @@ -
> 953,6 +957,22
> > @@ static void gen11_dsi_setup_timeouts(struct intel_encoder *encoder)
> >  	}
> >  }
> >
> > +static void gen11_dsi_config_util_pin(struct intel_encoder *encoder)
> > +{
> > +	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> > +	struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
> > +	u32 tmp;
> > +
> > +	/* used only as TE i/p for DSI0 for dual link TE is from slave DSI1 */
> > +	if (is_vid_mode(intel_dsi) || (intel_dsi->dual_link))
> > +		return;
> > +
> > +	tmp = I915_READ(UTIL_PIN_CTL);
> > +	tmp |= ICL_UTIL_PIN_DIRECTION;
> > +	tmp |= UTIL_PIN_ENABLE;
> > +	I915_WRITE(UTIL_PIN_CTL, tmp);
> > +}
> > +
> >  static void
> >  gen11_dsi_enable_port_and_phy(struct intel_encoder *encoder,
> >  			      const struct intel_crtc_state *pipe_config) @@ -
> 974,6 +994,9
> > @@ gen11_dsi_enable_port_and_phy(struct intel_encoder *encoder,
> >  	/* setup D-PHY timings */
> >  	gen11_dsi_setup_dphy_timings(encoder);
> >
> > +	/* Since transcoder is configured to take events from GPIO */
> > +	gen11_dsi_config_util_pin(encoder);
> > +
> >  	/* step 4h: setup DSI protocol timeouts */
> >  	gen11_dsi_setup_timeouts(encoder);
> >
> > @@ -1104,6 +1127,15 @@ static void
> gen11_dsi_deconfigure_trancoder(struct intel_encoder *encoder)
> >  	enum transcoder dsi_trans;
> >  	u32 tmp;
> >
> > +	/* disable periodic update mode */
> > +	if (is_cmd_mode(intel_dsi)) {
> > +		for_each_dsi_port(port, intel_dsi->ports) {
> > +			tmp = I915_READ(ICL_DSI_CMD_FRMCTL(port));
> > +			tmp &= ~ICL_PERIODIC_FRAME_UPDATE_ENABLE;
> > +			I915_WRITE(ICL_DSI_CMD_FRMCTL(port), tmp);
> > +		}
> > +	}
> > +
> >  	/* put dsi link in ULPS */
> >  	for_each_dsi_port(port, intel_dsi->ports) {
> >  		dsi_trans = dsi_port_to_transcoder(port);
> 
> --
> Jani Nikula, Intel Open Source Graphics Center