This patch does the following:
- Fakes live status of HDMI as connected (even if that's not).
While testing certain (monitor + cable) combinations with
various intel platforms, it seems that live status register
doesn't work reliably on some older devices. So limit the
live_status check for HDMI detection, only for platforms
from gen7 onwards.
This fixes regression added by patch:
'commit 237ed86c693d ("drm/i915: Check live status before reading edid")'
V2: restrict faking live_status to certain platforms
Based on suggestion by: Ville Syrjala<ville.syrjala@xxxxxxxxxxxxxxx>
Signed-off-by: Shashank Sharma <shashank.sharma@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_hdmi.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index b199ede..c2150db 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -1412,8 +1412,16 @@ intel_hdmi_detect(struct drm_connector *connector, bool force)
hdmi_to_dig_port(intel_hdmi));
}
- if (!live_status)
- DRM_DEBUG_KMS("Live status not up!");
+ /*
+ * Live status reg is not reliable for all older platforms
+ * So for certain platforms, dont block EDID read even if
+ * live_status is down, give EDID a shot.
+ */
+ if ((INTEL_INFO(dev_priv)->gen < 7 || IS_IVYBRIDGE(dev_priv))
+ && !live_status) {
+ DRM_DEBUG_KMS("Warning: live status not up, faking it\n");
+ live_status = true;
+ }
intel_hdmi_unset_edid(connector);
--
1.9.1
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