drm/i915/bxt: Use correct live status register for BXT platform
BXT platform uses live status bits from 0x44440 register to obtain DP
status on hotplug. The existing g4x_digital_port_connected() uses a
different register and hence misses DP hotplug events on BXT
platform. This patch fixes it by using the appropriate register(0x44440)
and live status bits(3:5).
Based on a patch by Durgadoss R <durgadoss.r@intel.com>, from whom the
commit message is shamelessly copy pasted.
Reported-by: Durgadoss R <durgadoss.r@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Durgadoss R <durgadoss.r@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index e7ebacd5..1ff063e 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -4576,6 +4576,29 @@
return I915_READ(PORT_HOTPLUG_STAT) & bit;
}
+static bool bxt_digital_port_connected(struct drm_i915_private *dev_priv,
+ struct intel_digital_port *port)
+{
+ u32 bit;
+
+ switch (port->port) {
+ case PORT_A:
+ bit = BXT_DE_PORT_HP_DDIA;
+ break;
+ case PORT_B:
+ bit = BXT_DE_PORT_HP_DDIB;
+ break;
+ case PORT_C:
+ bit = BXT_DE_PORT_HP_DDIC;
+ break;
+ default:
+ MISSING_CASE(port->port);
+ return false;
+ }
+
+ return I915_READ(GEN8_DE_PORT_ISR) & bit;
+}
+
/*
* intel_digital_port_connected - is the specified port connected?
* @dev_priv: i915 private structure
@@ -4590,6 +4613,8 @@
return ibx_digital_port_connected(dev_priv, port);
if (HAS_PCH_SPLIT(dev_priv))
return cpt_digital_port_connected(dev_priv, port);
+ else if (IS_BROXTON(dev_priv))
+ return bxt_digital_port_connected(dev_priv, port);
else if (IS_VALLEYVIEW(dev_priv))
return vlv_digital_port_connected(dev_priv, port);
else