firmware/sysfb: Update screen_info for relocated EFI framebuffers

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On ARM PCI systems, the PCI hierarchy might be reconfigured during
boot and the firmware framebuffer might move as a result of that.
The values in screen_info will then be invalid.

Work around this problem by tracking the framebuffer's initial
location before it get relocated; then fix the screen_info state
between reloaction and creating the firmware framebuffer's device.

This functionality has been lifted from efifb. See the commit message
of commit 55d728a40d ("efi/fb: Avoid reconfiguration of BAR that
covers the framebuffer") for more information.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240212090736.11464-8-tzimmermann@suse.de

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This commit is contained in:

Thomas Zimmermann 2024-02-12 10:06:15 +01:00

parent 784e27f281

commit 78aa89d1df

3 changed files with 106 additions and 0 deletions

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2

drivers/firmware/sysfb.c

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88

drivers/video/screen_info_pci.c

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16

include/linux/screen_info.h

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