[Bug 108546] Loading i915 kernel module breaks NVMe PCI device on the new Coffee Lake box

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108546

--- Comment #22 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
(In reply to Takashi Iwai from comment #10)
> So I tried to hack around the function, just like
> 
> --- a/drivers/gpu/drm/i915/intel_hdmi.c
> +++ b/drivers/gpu/drm/i915/intel_hdmi.c
> @@ -1921,7 +1921,7 @@ 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) &&
>  	    !intel_digital_port_connected(encoder))
>  		goto out;
>  
> 
> ... and this seems working.  No NVMe-related errors are seen after this.
> 
> I don't mean that this is the right fix, but it indicates that poking the
> HDMI detection for HDMI-3 screws up the NVMe on PCIe, apparently.

Hmm. I wonder if the gmbus pins are wired up to some other use, but somehow
they are still muxed such that gmbus can control them. That definitely sounds
like a BIOS bug, or potentially a pinctrl driver bug.

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