From a98728e0bb978fbe9246c93ea89198de612c22e6 Mon Sep 17 00:00:00 2001 From: Gary Wang Date: Tue, 15 Dec 2015 12:40:30 +0800 Subject: [PATCH] drm/i915: Correct max delay for HDMI hotplug live status checking The total delay of HDMI hotplug detecting with 30ms have already 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. v2: - straight up to loop execution for more clear in code readability - mdelay will replace with msleep by Daniel's new patch drm/i915: mdelay(10) considered harmful - suggest to re-evaluate try times for being compatible to old HDMI monitor Reviewed-by: Cooper Chiou Tested-by: Gary Wang Cc: Jani Nikula Cc: Daniel Vetter Cc: Gavin Hindman Cc: Sonika Jindal Cc: Shashank Sharma Signed-off-by: Gary Wang [danvet: fixup conflict with s/mdelay/msleep/ patch.] Cc: drm-intel-fixes@lists.freedesktop.org Signed-off-by: Daniel Vetter (cherry picked from commit 61fb3980dd396880ffba48523b1e27579868b82b) Signed-off-by: Jani Nikula --- drivers/gpu/drm/i915/intel_hdmi.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c index 12393df461e4..64086f2d4e26 100644 --- a/drivers/gpu/drm/i915/intel_hdmi.c +++ b/drivers/gpu/drm/i915/intel_hdmi.c @@ -1374,17 +1374,18 @@ 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; + unsigned int try; 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) { + for (try = 0; !live_status && try < 4; try++) { + if (try) + msleep(10); live_status = intel_digital_port_connected(dev_priv, hdmi_to_dig_port(intel_hdmi)); - msleep(10); } if (!live_status) -- 2.30.2