[Intel-gfx] [PATCH] drm/i915: Fix the HDMI hot plug disconnection failure (v3)

[Guang Bai]

On some GEN9 platforms, slowly unplugging (wiggling) the HDMI cable makes
the kernel to believe the HDMI display is still connected. This is because
the HDMI DDC lines are disconnected a little bit later after the hot-plug
interrupt triggered thus an immediate edid fetch can be made. Use digital
port live states to authorize the edid read.

v2: Fix the formatting issue
v3: Use digital port states to authorize the edid read

Cc: Jani Nikula <jani.nikula at intel.com>
Cc: Chris Chiu <chiu at endlessm.com>
Signed-off-by: Guang Bai <guang.bai at intel.com>
---
 drivers/gpu/drm/i915/intel_hdmi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index e2c6a2b3e8f2..8cf7c78b8cdd 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -1929,7 +1929,7 @@ intel_hdmi_detect(struct drm_connector *connector, bool force)
 
 	intel_display_power_get(dev_priv, POWER_DOMAIN_GMBUS);
 
-	if (IS_ICELAKE(dev_priv) &&
+	if ((IS_ICELAKE(dev_priv) || IS_GEN9_BC(dev_priv)) &&
 	    !intel_digital_port_connected(encoder))
 		goto out;
 
-- 
2.17.1