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

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On 10/30/2018 5:26 PM, Jani Nikula wrote:
From: Madhav Chauhan <madhav.chauhan@xxxxxxxxx>

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

Looks fine to me.

Regards,
Madhav


Signed-off-by: Madhav Chauhan <madhav.chauhan@xxxxxxxxx>
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
---
  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;
  	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);

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