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On coreboot platforms, a system framebuffer may be provided to the Linux
kernel by filling a LB_TAG_FRAMEBUFFER entry in the coreboot table. But
a coreboot payload (e.g: SeaBIOS) could also provide its own framebuffer
information to the Linux kernel.
If that's the case, arch x86 boot code will fill the global screen_info
data and this used by the Generic System Framebuffers (sysfb) framework,
to register a platform device with pdata about the system's framebuffer.
But later, the framebuffer_coreboot driver will try to do the same and
attempt to register a "simple-framebuffer" platform device (using the
information from the coreboot table), which will lead to an error due a
device with the same name already being registered:
sysfs: cannot create duplicate filename '/bus/platform/devices/simple-framebuffer.0'
...
coreboot: could not register framebuffer
framebuffer coreboot8: probe with driver framebuffer failed with error -17
To prevent this issue, make the framebuffer_core driver to not register
a platform device if the global struct screen_info data has been filled.
Reported-by: Brian Norris <briannorris@chromium.org>
Closes: https://lore.kernel.org/all/ZuCG-DggNThuF4pj@b20ea791c01f/T/#ma7fb65acbc1a56042258adac910992bb225a20d2
Suggested-by: Julius Werner <jwerner@chromium.org>
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Brian Norris <briannorris@chromium.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Link: https://lore.kernel.org/r/20240916110040.1688511-3-javierm@redhat.com
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
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|---|---|---|
| .. | ||
| cbmem.c | ||
| coreboot_table.c | ||
| coreboot_table.h | ||
| framebuffer-coreboot.c | ||
| gsmi.c | ||
| Kconfig | ||
| Makefile | ||
| memconsole-coreboot.c | ||
| memconsole-x86-legacy.c | ||
| memconsole.c | ||
| memconsole.h | ||
| vpd_decode.c | ||
| vpd_decode.h | ||
| vpd.c | ||