[Intel-gfx] [PATCH v8 24/38] drm/i915/icl: Get HW state for DSI encoder

[Imre Deak]

On Tue, Oct 30, 2018 at 01:56:30PM +0200, Jani Nikula wrote:
> From: Madhav Chauhan <madhav.chauhan at intel.com>
> 
> This patch read out the current hw state for DSI and
> return true if encoder is active.
> 
> v2 by Jani:
>  - Squash connector get hw state hook here
>  - Squash encode get hw state fix here
> 
> Signed-off-by: Madhav Chauhan <madhav.chauhan at intel.com>
> Signed-off-by: Jani Nikula <jani.nikula at intel.com>
> ---
>  drivers/gpu/drm/i915/icl_dsi.c | 42 ++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 42 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/icl_dsi.c b/drivers/gpu/drm/i915/icl_dsi.c
> index 83612c444eab..0c1f84cca16e 100644
> --- a/drivers/gpu/drm/i915/icl_dsi.c
> +++ b/drivers/gpu/drm/i915/icl_dsi.c
> @@ -1067,6 +1067,46 @@ static void gen11_dsi_get_config(struct intel_encoder *encoder,
>  	pipe_config->port_clock = pixel_clk;
>  }
>  
> +static bool gen11_dsi_get_hw_state(struct intel_encoder *encoder,
> +				   enum pipe *pipe)
> +{
> +	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> +	struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
> +	u32 tmp;
> +	enum port port;
> +	enum transcoder dsi_trans;
> +	bool ret = false;
> +
> +	if (!intel_display_power_get_if_enabled(dev_priv,
> +						encoder->power_domain))
> +		return false;
> +
> +	for_each_dsi_port(port, intel_dsi->ports) {
> +		dsi_trans = dsi_port_to_transcoder(port);
> +		tmp = I915_READ(TRANS_DDI_FUNC_CTL(dsi_trans));
> +		switch (tmp & TRANS_DDI_EDP_INPUT_MASK) {
> +		case TRANS_DDI_EDP_INPUT_A_ON:
> +			*pipe = PIPE_A;
> +			break;
> +		case TRANS_DDI_EDP_INPUT_B_ONOFF:
> +			*pipe = PIPE_B;
> +			break;
> +		case TRANS_DDI_EDP_INPUT_C_ONOFF:
> +			*pipe = PIPE_C;
> +			break;
> +		default:
> +			DRM_ERROR("Invalid PIPE input\n");
> +			goto out;
> +		}
> +
> +		tmp = I915_READ(PIPECONF(dsi_trans));
> +		ret = tmp & PIPECONF_ENABLE;
> +	}
> +out:
> +	intel_display_power_put(dev_priv, encoder->power_domain);
> +	return ret;
> +}
> +
>  static void gen11_dsi_encoder_destroy(struct drm_encoder *encoder)
>  {
>  	intel_encoder_destroy(encoder);
> @@ -1166,6 +1206,7 @@ void icl_dsi_init(struct drm_i915_private *dev_priv)
>  	encoder->disable = gen11_dsi_disable;
>  	encoder->port = port;
>  	encoder->get_config = gen11_dsi_get_config;
> +	encoder->get_hw_state = gen11_dsi_get_hw_state;

Since the encoder enable hook gets a power domain reference, we have to
make sure we take this reference during HW readout, if the encoder was
enabled. That can be done by defining the encoder->get_power_domains
hook returning those references, similarly to
intel_ddi_get_power_domains().

>  	encoder->type = INTEL_OUTPUT_DSI;
>  	encoder->cloneable = 0;
>  	encoder->crtc_mask = BIT(PIPE_A) | BIT(PIPE_B) | BIT(PIPE_C);
> @@ -1177,6 +1218,7 @@ void icl_dsi_init(struct drm_i915_private *dev_priv)
>  	connector->display_info.subpixel_order = SubPixelHorizontalRGB;
>  	connector->interlace_allowed = false;
>  	connector->doublescan_allowed = false;
> +	intel_connector->get_hw_state = intel_connector_get_hw_state;
>  
>  	/* attach connector to encoder */
>  	intel_connector_attach_encoder(intel_connector, encoder);
> -- 
> 2.11.0
> 
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