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Re: [PATCH v4 3/8] x86/EFI: retrieve EDID
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Bertrand Marquis <Bertrand.Marquis@xxxxxxx>
- Date: Wed, 6 Apr 2022 14:34:19 +0000
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx>
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- Thread-topic: [PATCH v4 3/8] x86/EFI: retrieve EDID
Hi Jan,
> On 31 Mar 2022, at 10:45, Jan Beulich <jbeulich@xxxxxxxx> wrote:
>
> When booting directly from EFI, obtaining this information from EFI is
> the only possible way. And even when booting with a boot loader
> interposed, it's more clean not to use legacy BIOS calls for this
> purpose. (The downside being that there are no "capabilities" that we
> can retrieve the EFI way.)
>
> To achieve this we need to propagate the handle used to obtain the
> EFI_GRAPHICS_OUTPUT_PROTOCOL instance for further obtaining an
> EFI_EDID_*_PROTOCOL instance, which has been part of the spec since 2.5.
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Acked-by: Bertrand Marquis <bertrand.marquis@xxxxxxx> #arm
Cheers
Bertrand
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