Hi Am 29.06.23 um 14:35 schrieb Arnd Bergmann:
On Thu, Jun 29, 2023, at 13:45, Thomas Zimmermann wrote:The global variable edid_info contains the firmware's EDID information as an extension to the regular screen_info on x86. Therefore move it to <asm/screen_info.h>. Add the Kconfig token ARCH_HAS_EDID_INFO to guard against access on architectures that don't provide edid_info. Select it on x86.I'm not sure we need another symbol in addition to CONFIG_FIRMWARE_EDID. Since all the code behind that existing symbol is also x86 specific, would it be enough to just add either 'depends on X86' or 'depends on X86 || COMPILE_TEST' there?
FIRMWARE_EDID is a user-selectable feature, while ARCH_HAS_EDID_INFO announces an architecture feature. They do different things.
Right now, ARCH_HAS_EDID_INFO only works on the old BIOS-based VESA systems. In the future, I want to add support for EDID data from EFI and OF as well. It would be stored in edid_info. I assume that the new symbol will become useful then.
Before this patchset, I originally wanted to make use of edid_info in the simpledrm graphics driver. But I found that the rsp code could use some work first. Maybe the patchset are already tailored towards the future changes.
Best regards Thomas
Arnd
-- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Frankenstrasse 146, 90461 Nuernberg, Germany GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman HRB 36809 (AG Nuernberg)
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