linux-kernel - Re: [PATCH] drm/i915: Don't force IOSF

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Message-ID: <20200720170950.75c989d4@xhacker.debian>
Date:   Mon, 20 Jul 2020 17:29:00 +0800
From:   Jisheng Zhang <Jisheng.Zhang@...aptics.com>
To:     Chris Wilson <chris@...is-wilson.co.uk>
Cc:     Daniel Vetter <daniel@...ll.ch>, David Airlie <airlied@...ux.ie>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/i915: Don't force IOSF_MBI

On Fri, 17 Jul 2020 20:32:44 +0100 Chris Wilson  wrote:

> 
> 
> Quoting Jisheng Zhang (2020-07-17 07:11:38)
> > The i915 doesn't depend on IOSF_MBI, asm/iosf_mbi.h already defines
> > isof_mbi_* APIs when ISOF_MBI is disabled.
> >
> > Don't force IOSF_MBI to allow disabling IOSF_MBI for non SoC platforms.  
> 
> But it is required for Valleyview/Cherryview and we want to support
> those by default. Tricky.

If linux kernel is built for Valleyview/Cherryview, ISOF_MBI has to be
enabled. The dependency is met there.

Thanks