[PATCH v2 3/4] drm/i915: Parse VBT data for lspcon

Shashank Sharma
2016-06-21T14:51:37Z

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

Signed-off-by: Shashank Sharma <shashank.sharma@intel.com>
---
drivers/gpu/drm/i915/i915_drv.h | 3 +++
drivers/gpu/drm/i915/intel_bios.c | 49 +++++++++++++++++++++++++++++++++++++++
2 files changed, 52 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 25ebe46..3719b81 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3671,6 +3671,9 @@ 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 da5ed4a..2b00c89 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 (WARN_ON_ONCE(!IS_GEN9(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