[Intel-gfx] [PATCH] drm/i915: Do not reset detect_done flag in intel_dp_detect

[Manasi Navare]

The detect_done flag was introduced in the commit
7d23e3c37bb3fc6952dc84007ee60cb533fd2d5c in order to avoid
multiple detects on hotplug where intel_dp_long_pulse()
was called from HPD handler as well as in intel_dp_detect.
So this detect_done flag was required to make sure intel_dp_detect()
did not call long pulse handler again if it was already been called
from HPD handler. However commit 1015811609c0328b5ed670d07748591b837e74eb
differs the long hpd handling entirely until the hotplug work runs to
avoid the double long hpd handling the "detect_done" flag is trying
to prevent.

So now we do not need to reset the detect_done flag to false in
intel_dp_detect. It will be reset in the intel_dp_hpd_pulse so
that intel_dp_detect does a full detect. However if the .detect
gets called during mode enumeration then we do not need to do a
full detect. This patch avoids the WARNS_ONS during connected boot
case when it calls intel_dp_check_link_status() due to multiple
detects and also avoids DP compliance failures. It avoids doing
a full detect every single time on .detect().

Cc: Ville Syrjala <ville.syrjala at linux.intel.com>
Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
Cc: Jani Nikula <jani.nikula at linux.intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare at intel.com>
---
 drivers/gpu/drm/i915/intel_dp.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index db75bb9..9c9277e 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -4470,8 +4470,6 @@ static bool intel_digital_port_connected(struct drm_i915_private *dev_priv,
 	if (!intel_dp->detect_done)
 		status = intel_dp_long_pulse(intel_dp->attached_connector);
 
-	intel_dp->detect_done = false;
-
 	return status;
 }
 
-- 
1.9.1