How about following instead of two levels of check in the while loop:
unsigned int retry = 3;
do {
live_status = intel_digital_port_connected(dev_priv,
hdmi_to_dig_port(intel_hdmi));
if (live_status)
break;
mdelay(10);
} while (--retry);
Regards,
Sonika
-----Original Message-----
From: Intel-gfx [mailto:intel-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx] On Behalf Of Wang, Gary C
Sent: Friday, December 11, 2015 7:39 AM
To: intel-gfx@xxxxxxxxxxxxxxxxxxxxx
Subject: [PATCH] drm/i915: Correct max delay for HDMI hotplug live status checking
The total delay of HDMI hotplug detecting with 30ms should have been split into a resolution of 3 retries of 10ms each, for the worst cases. But it still suffered from only waiting 10ms at most in intel_hdmi_detect(). This patch corrects it by reading hotplug status with 4 times at most for 30ms delay.
Reviewed-by: Cooper Chiou <cooper.chiou@xxxxxxxxx>
Cc: Gavin Hindman <gavin.hindman@xxxxxxxxx>
Signed-off-by: Gary Wang <gary.c.wang@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_hdmi.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-) 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 be7fab9..888401b
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -1387,16 +1387,19 @@ intel_hdmi_detect(struct drm_connector *connector, bool force)
struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
struct drm_i915_private *dev_priv = to_i915(connector->dev);
bool live_status = false;
- unsigned int retry = 3;
+ // read hotplug status 4 times at most for 30ms delay (3 retries of 10ms each)
+ unsigned int retry = 4;
DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
connector->base.id, connector->name);
intel_display_power_get(dev_priv, POWER_DOMAIN_GMBUS);
- while (!live_status && --retry) {
+ while (!live_status && retry--) {
live_status = intel_digital_port_connected(dev_priv,
hdmi_to_dig_port(intel_hdmi));
+ if (live_status || !retry)
+ break;
mdelay(10);
}
--
1.9.1
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