[Intel-gfx] [PATCH 1/7] drm/i915: add lspcon vbt bit parsing

[Shashank Sharma]

LSPCON can be configured on a port using VBT entry.
This patch adds code to parse VBT and detect presence of
LSPCON for a ddi port.

Signed-off-by: Akashdeep Sharma <akashdeep.sharma at intel.com>
Signed-off-by: Shashank Sharma <shashank.sharma at intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h       |  1 +
 drivers/gpu/drm/i915/intel_bios.c     | 42 +++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/intel_vbt_defs.h |  1 +
 3 files changed, 44 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index f330a53..cbd40de 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3373,6 +3373,7 @@ bool intel_bios_is_tv_present(struct drm_i915_private *dev_priv);
 bool intel_bios_is_lvds_present(struct drm_i915_private *dev_priv, u8 *i2c_pin);
 bool intel_bios_is_port_edp(struct drm_i915_private *dev_priv, enum port port);
 bool intel_bios_is_dsi_present(struct drm_i915_private *dev_priv, enum port *port);
+bool intel_bios_is_lspcon_preset(struct drm_device *dev, enum port port);
 
 /* intel_opregion.c */
 #ifdef CONFIG_ACPI
diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
index 083003b..a04ab5c 100644
--- a/drivers/gpu/drm/i915/intel_bios.c
+++ b/drivers/gpu/drm/i915/intel_bios.c
@@ -1588,3 +1588,45 @@ bool intel_bios_is_dsi_present(struct drm_i915_private *dev_priv,
 
 	return false;
 }
+
+bool
+intel_bios_is_lspcon_preset(struct drm_device *dev, enum port port)
+{
+	unsigned char i;
+	enum port dvo_port = 0;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+
+	/* LSPCON is supported only for GEN 9 */
+	if (!IS_GEN9(dev))
+		return false;
+
+	/* Check if lspcon is supported in VBT */
+	for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
+		if (!dev_priv->vbt.child_dev[i].common.lspcon)
+			continue;
+
+		switch (dev_priv->vbt.child_dev[i].common.dvo_port) {
+		case DVO_PORT_DPB:
+			dvo_port = PORT_B;
+			break;
+
+		case DVO_PORT_DPC:
+			dvo_port = PORT_C;
+			break;
+
+		case DVO_PORT_DPD:
+			dvo_port = PORT_D;
+			break;
+
+		default:
+			continue;
+		}
+
+		if (dvo_port == port) {
+			DRM_DEBUG_DRIVER("LSPCON configured on port %c\n",
+			port_name(port));
+			return true;
+		}
+	}
+	return false;
+}
diff --git a/drivers/gpu/drm/i915/intel_vbt_defs.h b/drivers/gpu/drm/i915/intel_vbt_defs.h
index 749dcea..0066b24 100644
--- a/drivers/gpu/drm/i915/intel_vbt_defs.h
+++ b/drivers/gpu/drm/i915/intel_vbt_defs.h
@@ -276,6 +276,7 @@ struct common_child_dev_config {
 	u8 flags_1;
 	u8 not_common3[13];
 	u8 iboost_level;
+	u8 lspcon:1;
 } __packed;
 
 
-- 
1.9.1