[PATCH] drm/i915: storm detection documentation update

[Sivakumar Thulasimani <sivakumar.thulasimani@intel.com>]

From: "Thulasimani,Sivakumar" <sivakumar.thulasimani@intel.com>

Update the hotplug documentation to explain that hotplug storm
is not expected for Display port panels and hence is not handled
in current code.

v2: update the statements as recommended by Daniel

Signed-off-by: Sivakumar Thulasimani <sivakumar.thulasimani@intel.com>
---
 drivers/gpu/drm/i915/intel_hotplug.c |    8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_hotplug.c b/drivers/gpu/drm/i915/intel_hotplug.c
index bac91a1..3c9171f 100644
--- a/drivers/gpu/drm/i915/intel_hotplug.c
+++ b/drivers/gpu/drm/i915/intel_hotplug.c
@@ -66,6 +66,14 @@
  * while before being re-enabled. The intention is to mitigate issues raising
  * from broken hardware triggering massive amounts of interrupts and grinding
  * the system to a halt.
+ *
+ * Current implementation expects that hotplug interrupt storm will not be
+ * seen when display port sink is connected, hence on platforms whose DP
+ * callback is handled by i915_digport_work_func reenabling of hpd is not
+ * performed (it was never expected to be disabled in the first place ;) )
+ * this is specific to DP sinks handled by this routine and any other display
+ * such as HDMI or DVI enabled on the same port will have proper logic since
+ * it will use i915_hotplug_work_func where this logic is handled.
  */
 
 enum port intel_hpd_pin_to_port(enum hpd_pin pin)
-- 
1.7.9.5

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