linux-kernel - RE: [PATCH] mei: make hdcp and pxp depend on X86 && PCI

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Date:   Sun, 30 Apr 2023 06:38:27 +0000
From:   "Winkler, Tomas" <tomas.winkler@...el.com>
To:     Arnd Bergmann <arnd@...db.de>, Adam Borowski <kilobyte@...band.pl>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Usyskin, Alexander" <alexander.usyskin@...el.com>
Subject: RE: [PATCH] mei: make hdcp and pxp depend on X86 && PCI



> On Wed, Apr 26, 2023, at 19:11, Winkler, Tomas wrote:
> >>
> >> On Tue, Apr 25, 2023, at 16:27, Adam Borowski wrote:
> >> > The problem in mainline is inconsistency: out of 6 config items, 4
> >> > repeat the "depends on X86 && PCI" line, the other 2 do not.
> >> > There's indeed no immediate functional issue, but I'd argue that a
> >> > dormant bug is
> >> still a bug.
> >
> > The MEI protocol (CONFIG_INTEL_MEI) is not PCI or X86 dependent.
> > INTEL_MEI_GSC is PCI dependent but not X86. (Hope I correct also on
> > implementation side) They HW layers are currently X86 dependent.
> 
> Ok, so in that case the dependencies should be relaxed like below I guess, in
> order to allow using the MEI on non-x86 i915 devices.
> 
>       Arnd
> 
> diff --git a/drivers/misc/mei/Kconfig b/drivers/misc/mei/Kconfig index
> d21486d69df2..7c6e3b4588d0 100644
> --- a/drivers/misc/mei/Kconfig
> +++ b/drivers/misc/mei/Kconfig
> @@ -2,7 +2,6 @@
>  # Copyright (c) 2003-2019, Intel Corporation. All rights reserved.
>  config INTEL_MEI
>         tristate "Intel Management Engine Interface"
> -       depends on X86 && PCI
>         help
>           The Intel Management Engine (Intel ME) provides Manageability,
>           Security and Media services for system containing Intel chipsets.
> @@ -39,7 +38,7 @@ config INTEL_MEI_ME
>  config INTEL_MEI_TXE
>         tristate "Intel Trusted Execution Environment with ME Interface"
>         select INTEL_MEI
> -       depends on X86 && PCI
> +       depends on X86
This should be both X86 and PCI, this is  a HW dependent module 
>         help
>           MEI Support for Trusted Execution Environment device on Intel SoCs
> 
> @@ -50,7 +49,7 @@ config INTEL_MEI_GSC
>         tristate "Intel MEI GSC embedded device"
>         depends on INTEL_MEI
>         depends on INTEL_MEI_ME
> -       depends on X86 && PCI
> +       depends on PCI
>         depends on DRM_I915
>         help
>           Intel auxiliary driver for GSC devices embedded in Intel graphics devices.