[Bug 96321] New: [CHV] HDMI detection fails, black screen after boot

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96321

            Bug ID: 96321
           Summary: [CHV] HDMI detection fails, black screen after boot
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: radosd at radosd.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org
     i915 platform: BSW/CHT
     i915 features: display/HDMI

system: Voyo v3 - x7-Z8700
OS: gentoo testing ~amd64
kernel: 4.6.0

I'm getting black screen on attached TV (Panasonic TX-48AS640E) just after
switching from EFI FB to inteldrmfb. This system has just one display output -
HDMI.

>From dmesg it seems intel_hdmi_detect is picking incorrect pin for detection
(based on wrong info from vbt?)

[    0.721621] [drm:drm_helper_probe_single_connector_modes]
[CONNECTOR:40:HDMI-A-1]
[    0.721628] [drm:intel_hdmi_detect] [CONNECTOR:40:HDMI-A-1]
[    0.721635] [drm:intel_power_well_enable] enabling display
[    0.729517] i2c i2c-2: master_xfer[0] W, addr=0x50, len=1
[    0.729523] i2c i2c-2: master_xfer[1] R, addr=0x50, len=1
[    0.729693] [drm:do_gmbus_xfer] GMBUS [i915 gmbus panel] NAK for addr: 0050
w(1)
[    0.729699] [drm:do_gmbus_xfer] GMBUS [i915 gmbus panel] NAK on first
message, retry
[    0.729865] [drm:do_gmbus_xfer] GMBUS [i915 gmbus panel] NAK for addr: 0050
w(1)
[    0.729872] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter
i915 gmbus panel
[    0.735170] [drm:drm_helper_probe_single_connector_modes]
[CONNECTOR:40:HDMI-A-1] status updated from unknown to disconnected
[    0.735181] [drm:drm_helper_probe_single_connector_modes]
[CONNECTOR:40:HDMI-A-1] disconnected

I'm able to get correct edid on dpc:
voyo ~ # i2cdetect -l
i2c-0   i2c             i915 gmbus ssc                          I2C adapter
i2c-1   i2c             i915 gmbus vga                          I2C adapter
i2c-2   i2c             i915 gmbus panel                        I2C adapter
i2c-3   i2c             i915 gmbus dpc                          I2C adapter
i2c-4   i2c             i915 gmbus dpb                          I2C adapter
i2c-5   i2c             i915 gmbus dpd                          I2C adapter
i2c-6   i2c             DPDDC-D                                 I2C adapter

voyo ~ # get-edid 
This is read-edid version 3.0.2. Prepare for some fun.
Attempting to use i2c interface
No EDID on bus 0
No EDID on bus 1
No EDID on bus 2
No EDID on bus 4
No EDID on bus 5
No EDID on bus 6
1 potential busses found: 3
256-byte EDID successfully retrieved from i2c bus 3

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