[v6 06/12] drm/i915/display: Implement infoframes readback for LSPCON

[Uma Shankar]

Implemented Infoframes enabled readback for LSPCON devices.
This will help align the implementation with state readback
infrastructure.

Signed-off-by: Uma Shankar <uma.shankar at intel.com>
---
 drivers/gpu/drm/i915/display/intel_lspcon.c | 63 ++++++++++++++++++++-
 1 file changed, 61 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_lspcon.c b/drivers/gpu/drm/i915/display/intel_lspcon.c
index 9034ce6f20b9..0ebe9a700291 100644
--- a/drivers/gpu/drm/i915/display/intel_lspcon.c
+++ b/drivers/gpu/drm/i915/display/intel_lspcon.c
@@ -576,11 +576,70 @@ void lspcon_set_infoframes(struct intel_encoder *encoder,
 				  buf, ret);
 }
 
+static bool _lspcon_read_avi_infoframe_enabled_mca(struct drm_dp_aux *aux)
+{
+	int ret;
+	u32 val = 0;
+	u16 reg = LSPCON_MCA_AVI_IF_CTRL;
+
+	ret = drm_dp_dpcd_read(aux, reg, &val, 1);
+	if (ret < 0) {
+		DRM_ERROR("DPCD read failed, address 0x%x\n", reg);
+		return false;
+	}
+
+	if (val & LSPCON_MCA_AVI_IF_KICKOFF)
+		return true;
+
+	return false;
+}
+
+static bool _lspcon_read_avi_infoframe_enabled_parade(struct drm_dp_aux *aux)
+{
+	int ret;
+	u32 val = 0;
+	u16 reg = LSPCON_PARADE_AVI_IF_CTRL;
+
+	ret = drm_dp_dpcd_read(aux, reg, &val, 1);
+	if (ret < 0) {
+		DRM_ERROR("DPCD read failed, address 0x%x\n", reg);
+		return false;
+	}
+
+	if (val & LSPCON_PARADE_AVI_IF_KICKOFF)
+		return true;
+
+	return false;
+}
+
 u32 lspcon_infoframes_enabled(struct intel_encoder *encoder,
 			      const struct intel_crtc_state *pipe_config)
 {
-	/* FIXME actually read this from the hw */
-	return 0;
+	struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
+	struct intel_lspcon *lspcon = enc_to_intel_lspcon(encoder);
+	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
+	bool infoframes_enabled;
+	u32 mask = 0;
+	u32 val;
+
+	if (lspcon->vendor == LSPCON_VENDOR_MCA)
+		infoframes_enabled = _lspcon_read_avi_infoframe_enabled_mca(&intel_dp->aux);
+	else
+		infoframes_enabled = _lspcon_read_avi_infoframe_enabled_parade(&intel_dp->aux);
+
+	if (infoframes_enabled)
+		return true;
+
+	if (lspcon->hdr_supported) {
+		val = intel_de_read(dev_priv,
+				    HSW_TVIDEO_DIP_CTL(pipe_config->cpu_transcoder));
+		mask |= VIDEO_DIP_ENABLE_GMP_HSW;
+
+		if (val & mask)
+			return val & mask;
+	}
+
+	return false;
 }
 
 void lspcon_resume(struct intel_lspcon *lspcon)
-- 
2.22.0