linux-kernel - RE: [PATCH v6 09/10] arm64: efi: Export screen

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Message-ID: <MW2PR2101MB10524254D2FE3EFC72329465D7F70@MW2PR2101MB1052.namprd21.prod.outlook.com>
Date:   Wed, 18 Mar 2020 00:18:39 +0000
From:   Michael Kelley <mikelley@...rosoft.com>
To:     Arnd Bergmann <arnd@...db.de>
CC:     Will Deacon <will@...nel.org>, Ard Biesheuvel <ardb@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Mark Rutland <mark.rutland@....com>,
        Marc Zyngier <maz@...nel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        gregkh <gregkh@...uxfoundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        linux-efi <linux-efi@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        "olaf@...fle.de" <olaf@...fle.de>,
        Andy Whitcroft <apw@...onical.com>,
        vkuznets <vkuznets@...hat.com>, Jason Wang <jasowang@...hat.com>,
        "marcelo.cerri@...onical.com" <marcelo.cerri@...onical.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Sunil Muthuswamy <sunilmut@...rosoft.com>,
        Boqun Feng <boqun.feng@...il.com>
Subject: RE: [PATCH v6 09/10] arm64: efi: Export screen_info

From: Arnd Bergmann <arnd@...db.de>
> 
> On Sat, Mar 14, 2020 at 4:36 PM Michael Kelley <mikelley@...rosoft.com> wrote:
> >
> > The Hyper-V frame buffer driver may be built as a module, and
> > it needs access to screen_info. So export screen_info.
> >
> > Signed-off-by: Michael Kelley <mikelley@...rosoft.com>
> 
> Is there any chance of using a more modern KMS based driver for the screen
> than the old fbdev subsystem? I had hoped to one day completely remove
> support for the old CONFIG_VIDEO_FBDEV and screen_info from modern
> architectures.
> 

The current hyperv_fb.c driver is all we have today for the synthetic Hyper-V
frame buffer device.  That driver builds and runs on both ARM64 and x86.

I'm not knowledgeable about video/graphics drivers, but when you
say "a more modern KMS based driver", are you meaning one based on
DRM & KMS?  Does DRM make sense for a "dumb" frame buffer device?
Are there any drivers that would be a good pattern to look at?

Michael