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
Signed-off-by: Shashank Sharma <shashank.sharma@xxxxxxxxx>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
---
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 c97724d..909dc95 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2791,6 +2791,8 @@ struct drm_i915_cmd_table {
#define HAS_GMCH_DISPLAY(dev) (INTEL_INFO(dev)->gen < 5 || \
IS_VALLEYVIEW(dev) || IS_CHERRYVIEW(dev))
+#define HAS_LSPCON(dev) (IS_GEN9(dev))
+
/* DPF == dynamic parity feature */
#define HAS_L3_DPF(dev) (IS_IVYBRIDGE(dev) || IS_HASWELL(dev))
#define NUM_L3_SLICES(dev) (IS_HSW_GT3(dev) ? 2 : HAS_L3_DPF(dev))
@@ -3574,6 +3576,9 @@ 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 c6e69e4..ffc046a 100644
--- a/drivers/gpu/drm/i915/intel_bios.c
+++ b/drivers/gpu/drm/i915/intel_bios.c
@@ -1759,3 +1759,52 @@ 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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