Many GEN9 boards come with on-board lspcon cards.
Fot these boards, VBT configuration should properly point out
if a particular port contains lspcon device, so that driver can
initialize it properly.

This patch adds a utility function, which checks the VBT flag
for lspcon bit, and tells us if a port is configured to have a
lspcon device or not.

V2: Fixed review comments from Ville
- Do not forget PORT_D while checking lspcon for GEN9

V3: Addressed review comments from Rodrigo
- Create a HAS_LSPCON() macro for better use case handling.
- Do not dump warnings for non-gen-9 platforms, it will be noise.

V4: Rebase
V5: Rebase
V6: Pass dev_priv to HAS_LSPCON() macro

Signed-off-by: Shashank Sharma <shashank.sha...@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.v...@intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h   |  5 ++++
 drivers/gpu/drm/i915/intel_bios.c | 49 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 54 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index fe875b2..7bab2f1 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2864,6 +2864,8 @@ struct drm_i915_cmd_table {
 
 #define HAS_GMCH_DISPLAY(dev_priv) ((dev_priv)->info.has_gmch_display)
 
+#define HAS_LSPCON(dev_priv) (IS_GEN9(dev_priv))
+
 /* DPF == dynamic parity feature */
 #define HAS_L3_DPF(dev_priv) ((dev_priv)->info.has_l3_dpf)
 #define NUM_L3_SLICES(dev_priv) (IS_HSW_GT3(dev_priv) ? \
@@ -3631,6 +3633,9 @@ bool intel_bios_is_port_dp_dual_mode(struct 
drm_i915_private *dev_priv, enum por
 bool intel_bios_is_dsi_present(struct drm_i915_private *dev_priv, enum port 
*port);
 bool intel_bios_is_port_hpd_inverted(struct drm_i915_private *dev_priv,
                                     enum port port);
+bool intel_bios_is_lspcon_present(struct drm_i915_private *dev_priv,
+                               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 83667e8..32e1def 100644
--- a/drivers/gpu/drm/i915/intel_bios.c
+++ b/drivers/gpu/drm/i915/intel_bios.c
@@ -1763,3 +1763,52 @@ intel_bios_is_port_hpd_inverted(struct drm_i915_private 
*dev_priv,
 
        return false;
 }
+
+/**
+ * intel_bios_is_lspcon_present - if LSPCON is attached on %port
+ * @dev_priv:  i915 device instance
+ * @port:      port to check
+ *
+ * Return true if LSPCON is present on this port
+ */
+bool
+intel_bios_is_lspcon_present(struct drm_i915_private *dev_priv,
+                               enum port port)
+{
+       int i;
+
+       if (!HAS_LSPCON(dev_priv))
+               return false;
+
+       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_DPA:
+               case DVO_PORT_HDMIA:
+                       if (port == PORT_A)
+                               return true;
+                       break;
+               case DVO_PORT_DPB:
+               case DVO_PORT_HDMIB:
+                       if (port == PORT_B)
+                               return true;
+                       break;
+               case DVO_PORT_DPC:
+               case DVO_PORT_HDMIC:
+                       if (port == PORT_C)
+                               return true;
+                       break;
+               case DVO_PORT_DPD:
+               case DVO_PORT_HDMID:
+                       if (port == PORT_D)
+                               return true;
+                       break;
+               default:
+                       break;
+               }
+       }
+
+       return false;
+}
-- 
1.9.1

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