[Intel-gfx] [V6 1/9] drm/i915/dsi: Configure transcoder operation for command mode.

[Jani Nikula]

On Thu, 09 Jan 2020, 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.
>
> v2: Disable util pin (Jani)
>
> Signed-off-by: Vandita Kulkarni <vandita.kulkarni at intel.com>
> ---
>  drivers/gpu/drm/i915/display/icl_dsi.c | 52 ++++++++++++++++++++++++++
>  1 file changed, 52 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/display/icl_dsi.c b/drivers/gpu/drm/i915/display/icl_dsi.c
> index 8435bc5a7a74..ca37beca3e41 100644
> --- a/drivers/gpu/drm/i915/display/icl_dsi.c
> +++ b/drivers/gpu/drm/i915/display/icl_dsi.c
> @@ -724,6 +724,18 @@ gen11_dsi_configure_transcoder(struct intel_encoder *encoder,
>  				tmp |= VIDEO_MODE_SYNC_PULSE;
>  				break;
>  			}
> +		} else {
> +			/*
> +			 * FIXME: Retrieve this info from VBT.
> +			 * As per the spec when dsi transcoder is operating
> +			 * in TE GATE mode, TE comes from GPIO
> +			 * which is UTIL PIN for DSI 0.
> +			 * Also this GPIO would not be used for other
> +			 * purposes is an assumption.
> +			 */
> +			tmp &= ~OP_MODE_MASK;
> +			tmp |= CMD_MODE_TE_GATE;
> +			tmp |= TE_SOURCE_GPIO;
>  		}
>  
>  		I915_WRITE(DSI_TRANS_FUNC_CONF(dsi_trans), tmp);
> @@ -991,6 +1003,32 @@ static void gen11_dsi_setup_timeouts(struct intel_encoder *encoder,
>  	}
>  }
>  
> +static void gen11_dsi_config_util_pin(struct intel_encoder *encoder,
> +				      bool enable)
> +{
> +	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 as TE i/p for DSI0,
> +	 * for dual link/DSI1 TE is from slave DSI1
> +	 * through GPIO.
> +	 */
> +	if (is_vid_mode(intel_dsi) || (intel_dsi->ports & BIT(PORT_B)))

What about single link command mode on port B?

> +		return;
> +
> +	tmp = I915_READ(UTIL_PIN_CTL);
> +
> +	if (enable) {
> +		tmp |= UTIL_PIN_DIRECTION_INPUT;
> +		tmp |= UTIL_PIN_ENABLE;
> +	} else {
> +		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 *crtc_state)
> @@ -1012,6 +1050,9 @@ gen11_dsi_enable_port_and_phy(struct intel_encoder *encoder,
>  	/* setup D-PHY timings */
>  	gen11_dsi_setup_dphy_timings(encoder, crtc_state);
>  
> +	/* Since transcoder is configured to take events from GPIO */
> +	gen11_dsi_config_util_pin(encoder, true);
> +
>  	/* step 4h: setup DSI protocol timeouts */
>  	gen11_dsi_setup_timeouts(encoder, crtc_state);
>  
> @@ -1144,6 +1185,15 @@ 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(DSI_CMD_FRMCTL(port));
> +			tmp &= ~DSI_PERIODIC_FRAME_UPDATE_ENABLE;
> +			I915_WRITE(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);
> @@ -1247,6 +1297,8 @@ static void gen11_dsi_disable(struct intel_encoder *encoder,
>  	/* step3: disable port */
>  	gen11_dsi_disable_port(encoder);
>  
> +	gen11_dsi_config_util_pin(encoder, false);
> +
>  	/* step4: disable IO power */
>  	gen11_dsi_disable_io_power(encoder);
>  }

-- 
Jani Nikula, Intel Open Source Graphics Center