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 <durgados...@intel.com>, from whom the
commit message is shamelessly copy pasted.
Reported-by: Durgadoss R <durgados...@intel.com>
Signed-off-by: Jani Nikula <jani.nik...@intel.com>
---
drivers/gpu/drm/i915/intel_dp.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index bc3b94fa15cb..c6d4bb62e83a 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -4561,6 +4561,28 @@ static int vlv_digital_port_connected(struct
drm_i915_private *dev_priv,
return I915_READ(PORT_HOTPLUG_STAT) & bit ? 1 : 0;
}
+static int 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:
+ return -EINVAL;
+ }
+
+ return I915_READ(GEN8_DE_PORT_ISR) & bit ? 1 : 0;
+}
+
/*
* intel_digital_port_connected - is the specified port connected?
* @dev_priv: i915 private structure
@@ -4577,6 +4599,8 @@ static int intel_digital_port_connected(struct
drm_i915_private *dev_priv,
return cpt_digital_port_connected(dev_priv, port);
else if (IS_VALLEYVIEW(dev_priv))
return vlv_digital_port_connected(dev_priv, port);
+ else if (IS_BROXTON(dev_priv))
+ return bxt_digital_port_connected(dev_priv, port);
else
return g4x_digital_port_connected(dev_priv, port);
}
--
2.1.4
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