[Bug 109824] [CI][DRMTIP] igt at debugfs_test@read_all_entries_display_off - dmesg-warn - Unclaimed read from register 0x1e1110

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109824

--- Comment #5 from Arek Hiler <arkadiusz.hiler at intel.com> ---
Seems like we have unclaimed read on 
('PORT_HOTPLUG_EN',             '0x61110', '0x180000')[1]

That happens here[2]:
        } else if (IS_VALLEYVIEW(dev_priv)) {
                /* ... */
                seq_printf(m, "Port hotplug:\t%08x\n",
                           I915_READ(PORT_HOTPLUG_EN));
                /* ... */
        } else if (!HAS_PCH_SPLIT(dev_priv)) {

We don't take any extra wakerefs for VLV but on CHV we do:
                intel_display_power_get(dev_priv, POWER_DOMAIN_INIT);

for this register and the following DP registers.

Keeping this as medium bacause:
 1. user impact is negligible - it's an error in the debugfs
 2. CI impact is medium - kernel taints and stops execution on this bug

[1]:
https://gitlab.freedesktop.org/drm/igt-gpu-tools/blob/master/tools/registers/vlv_display_base.txt#L103
[2]:
https://cgit.freedesktop.org/drm-tip/tree/drivers/gpu/drm/i915/i915_debugfs.c#n581

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