From: Gerd Hoffmann <kraxel@redhat.com>
To: Felix Kuehling <felix.kuehling@amd.com>
Cc: "open list:EFIFB FRAMEBUFFER DRIVER"
<linux-fbdev@vger.kernel.org>,
kernel@gpiccoli.net, "Baoquan He" <bhe@redhat.com>,
"Samuel Iglesias Gonsálvez" <siglesias@igalia.com>,
"xinhui pan" <Xinhui.Pan@amd.com>,
kexec@lists.infradead.org,
"Maling list - DRI developers" <dri-devel@lists.freedesktop.org>,
"Guilherme G. Piccoli" <gpiccoli@igalia.com>,
pjones@redhat.com, "amd-gfx list" <amd-gfx@lists.freedesktop.org>,
"Thomas Zimmermann" <tzimmermann@suse.de>,
"Deucher, Alexander" <alexander.deucher@amd.com>,
"Dave Young" <dyoung@redhat.com>,
"Christian König" <christian.koenig@amd.com>,
"Vivek Goyal" <vgoyal@redhat.com>
Subject: Re: Reuse framebuffer after a kexec (amdgpu / efifb)
Date: Sat, 11 Dec 2021 10:20:50 +0100 [thread overview]
Message-ID: <20211211092050.wbczxxrnzoywbns6@sirius.home.kraxel.org> (raw)
In-Reply-To: <3988a221-2f6a-540a-3d77-18c2c67ddbe7@amd.com>
On Fri, Dec 10, 2021 at 07:54:34PM -0500, Felix Kuehling wrote:
> Do you actually need to restore the exact boot-up mode? If you have the same
> framebuffer memory layout (width, height, bpp, stride) the precise display
> timing doesn't really matter. So we "just" need to switch to a mode that's
> compatible with the efifb framebuffer parameters and point the display
> engine at the efifb as the scan-out buffer.
That'll probably doable for a normal kexec but in case of a crashdump
kexec I don't think it is a good idea to touch the gpu using the driver
of the kernel which just crashed ...
take care,
Gerd
next prev parent reply other threads:[~2021-12-11 9:26 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-09 16:00 Reuse framebuffer after a kexec (amdgpu / efifb) Guilherme G. Piccoli
2021-12-09 16:09 ` Christian König
2021-12-09 17:31 ` Alex Deucher
2021-12-09 17:59 ` Guilherme G. Piccoli
2021-12-09 18:06 ` Alex Deucher
2021-12-09 18:17 ` Guilherme G. Piccoli
2021-12-09 19:20 ` Alex Deucher
2021-12-10 7:19 ` Gerd Hoffmann
2021-12-10 8:24 ` Thomas Zimmermann
2021-12-10 14:08 ` Guilherme G. Piccoli
2021-12-10 14:16 ` Alex Deucher
2021-12-10 14:25 ` Guilherme G. Piccoli
2021-12-10 15:13 ` Christian König
2021-12-10 15:24 ` Guilherme G. Piccoli
2021-12-10 15:32 ` Christian König
2021-12-10 19:11 ` Alex Deucher
2021-12-11 0:54 ` Felix Kuehling
2021-12-11 9:20 ` Gerd Hoffmann [this message]
2021-12-10 19:05 ` Alex Deucher
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