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* [PATCH] drm/i915: increase the tries for HDMI hotplug live status checking
@ 2015-12-23  8:11 Gary Wang
  2015-12-23  8:30 ` Wang, Gary C
                   ` (4 more replies)
  0 siblings, 5 replies; 8+ messages in thread
From: Gary Wang @ 2015-12-23  8:11 UTC (permalink / raw)
  To: intel-gfx; +Cc: Shobhit Kumar

The total delay of HDMI hotplug detecting with 30ms is sometimes not
enoughtfor HDMI live status up with specific HDMI monitors in BSW platform.

After doing experiments for following monitors, it needs 80ms at least
for those worst cases.

Lenovo L246 1xwA (4 failed, necessary hot-plug delay: 58/40/60/40ms)
Philips HH2AP (9 failed, necessary hot-plug delay: 80/50/50/60/46/40/58/58/39ms)
BENQ ET-0035-N (6 failed, necessary hot-plug delay: 60/50/50/80/80/40ms)
DELL U2713HM (2 failed, necessary hot-plug delay: 58/59ms)
HP HP-LP2475w (5 failed, necessary hot-plug delay: 70/50/40/60/40ms)

It looks like 70-80 ms is BSW platform needs in some bad cases of the
monitors at this end (8 times delay at most). Keep less than 100ms for
HDCP pulse HPD low (with at least 100ms) to respond a plug out.

Reviewed-by: Cooper Chiou <cooper.chiou@intel.com>
Tested-by: Gary Wang <gary.c.wang@intel.com>
Cc: Gavin Hindman <gavin.hindman@intel.com>
Cc: Sonika Jindal <sonika.jindal@intel.com>
Cc: Shashank Sharma <shashank.sharma@intel.com>
Cc: Shobhit Kumar <shobhit.kumar@intel.com>
Signed-off-by: Gary Wang <gary.c.wang@intel.com>
---
 drivers/gpu/drm/i915/intel_hdmi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
 mode change 100644 => 100755 drivers/gpu/drm/i915/intel_hdmi.c

diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
old mode 100644
new mode 100755
index 6214175..4a77639
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -1392,7 +1392,7 @@ intel_hdmi_detect(struct drm_connector *connector, bool force)
 
 	intel_display_power_get(dev_priv, POWER_DOMAIN_GMBUS);
 
-	for (try = 0; !live_status && try < 4; try++) {
+	for (try = 0; !live_status && try < 9; try++) {
 		if (try)
 			msleep(10);
 		live_status = intel_digital_port_connected(dev_priv,
-- 
1.9.1

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^ permalink raw reply related	[flat|nested] 8+ messages in thread

end of thread, other threads:[~2016-01-04  2:00 UTC | newest]

Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2015-12-23  8:11 [PATCH] drm/i915: increase the tries for HDMI hotplug live status checking Gary Wang
2015-12-23  8:30 ` Wang, Gary C
2015-12-23  8:49 ` ✗ failure: Fi.CI.BAT Patchwork
2015-12-23 11:34 ` [PATCH] drm/i915: increase the tries for HDMI hotplug live status checking Kumar, Shobhit
2015-12-25 11:58 ` Sharma, Shashank
2015-12-30 11:57 ` Jani Nikula
2015-12-30 17:47   ` Kumar, Shobhit
2016-01-04  2:00     ` Wang, Gary C

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