[Intel-gfx] [PATCH v3 4/4] drm/i915: Enable lspcon initialization

[Vivi, Rodrigo]

If this works even without setting the info frame on this code and that
is on progress on other series I believe we can move forward so in this
case fell free to use:

Reviewed-by: Rodrigo Vivi <rodrigo.vivi at intel.com>

On Tue, 2016-07-05 at 18:35 +0530, Shashank Sharma wrote:
> This patch adds initialization code for lspcon.
> What we are doing here is:
> 	- Check if lspcon is configured in VBT for this port
> 	- If lspcon is configured, initialize it and configure it
>           as DP port.
> 
> V2: Addressed Ville's review comments:
> - Not adding AVI IF functions for LSPCON display now.
>   This part will be added once the dig_port level AVI-IF series
>   gets merged.
> 
> V3: Rebase
> 
> Signed-off-by: Shashank Sharma <shashank.sharma at intel.com>
> ---
>  drivers/gpu/drm/i915/intel_ddi.c | 29 ++++++++++++++++++++++++++++-
>  1 file changed, 28 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_ddi.c
> b/drivers/gpu/drm/i915/intel_ddi.c
> index d6efe8b..3d115a7 100644
> --- a/drivers/gpu/drm/i915/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/intel_ddi.c
> @@ -2326,7 +2326,7 @@ void intel_ddi_init(struct drm_device *dev,
> enum port port)
>  	struct intel_digital_port *intel_dig_port;
>  	struct intel_encoder *intel_encoder;
>  	struct drm_encoder *encoder;
> -	bool init_hdmi, init_dp;
> +	bool init_hdmi, init_dp, init_lspcon = false;
>  	int max_lanes;
>  
>  	if (I915_READ(DDI_BUF_CTL(PORT_A)) & DDI_A_4_LANES) {
> @@ -2358,6 +2358,19 @@ void intel_ddi_init(struct drm_device *dev,
> enum port port)
>  	init_hdmi = (dev_priv->vbt.ddi_port_info[port].supports_dvi
> ||
>  		     dev_priv-
> >vbt.ddi_port_info[port].supports_hdmi);
>  	init_dp = dev_priv->vbt.ddi_port_info[port].supports_dp;
> +
> +	if (intel_bios_is_lspcon_present(dev_priv, port)) {
> +		/*
> +		 * Lspcon device needs to be driven with DP
> connector
> +		 * with special detection sequence. So make sure DP
> +		 * is initialized before lspcon.
> +		 */
> +		init_dp = true;
> +		init_lspcon = true;
> +		init_hdmi = false;
> +		DRM_DEBUG_KMS("VBT says port %c has lspcon\n",
> port_name(port));
> +	}
> +
>  	if (!init_dp && !init_hdmi) {
>  		DRM_DEBUG_KMS("VBT says port %c is not DVI/HDMI/DP
> compatible, respect it\n",
>  			      port_name(port));
> @@ -2433,6 +2446,20 @@ void intel_ddi_init(struct drm_device *dev,
> enum port port)
>  			goto err;
>  	}
>  
> +	if (init_lspcon) {
> +		if (lspcon_init(intel_dig_port))
> +			/* TODO: handle hdmi info frame part */
> +			DRM_DEBUG_KMS("LSPCON init success on port
> %c\n",
> +				port_name(port));
> +		else
> +			/*
> +			 * LSPCON init faied, but DP init was
> success, so
> +			 * lets try to drive as DP++ port.
> +			 */
> +			DRM_ERROR("LSPCON init failed on port %c\n",
> +				port_name(port));
> +	}
> +
>  	return;
>  
>  err: