From dba14b27dd3ca5ce5b3a1d538862e7dce556dba7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala@linux.intel.com>
Date: Wed, 17 Jan 2018 21:21:46 +0200
Subject: drm/i915: Reinitialize sink scrambling/TMDS clock ratio on HPD
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The LG 4k TV I have doesn't deassert HPD when I turn the TV off, but
when I turn it back on it will pulse the HPD line. By that time it has
forgotten everything we told it about scrambling and the clock ratio.
Hence if we want to get a picture out if it again we have to tell it
whether we're currently sending scrambled data or not. Implement
that via the encoder->hotplug() hook.
v2: Force a full modeset to not follow the HDMI 2.0 spec more
closely (Shashank)
[pushed with whitespace fixes to make sparse happy]
Cc: Shashank Sharma <shashank.sharma@intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180117192149.17760-1-ville.syrjala@linux.intel.com
---
drivers/gpu/drm/i915/intel_crt.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
(limited to 'drivers/gpu/drm/i915/intel_crt.c')
diff --git a/drivers/gpu/drm/i915/intel_crt.c b/drivers/gpu/drm/i915/intel_crt.c
index 391dd69..c0a8805 100644
--- a/drivers/gpu/drm/i915/intel_crt.c
+++ b/drivers/gpu/drm/i915/intel_crt.c
@@ -956,8 +956,10 @@ void intel_crt_init(struct drm_i915_private *dev_priv)
crt->base.power_domain = POWER_DOMAIN_PORT_CRT;
if (I915_HAS_HOTPLUG(dev_priv) &&
- !dmi_check_system(intel_spurious_crt_detect))
+ !dmi_check_system(intel_spurious_crt_detect)) {
crt->base.hpd_pin = HPD_CRT;
+ crt->base.hotplug = intel_encoder_hotplug;
+ }
if (HAS_DDI(dev_priv)) {
crt->base.port = PORT_E;
--
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