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The current situation regarding boot-framebuffers (VGA, VESA/VBE, EFI) on x86 causes troubles when loading multiple fbdev drivers. The global "struct screen_info" does not provide any state-tracking about which drivers use the FBs. request_mem_region() theoretically works, but unfortunately vesafb/efifb ignore it due to quirks for broken boards. Avoid this by creating a platform framebuffer devices with a pointer to the "struct screen_info" as platform-data. Drivers can now create platform-drivers and the driver-core will refuse multiple drivers being active simultaneously. We keep the screen_info available for backwards-compatibility. Drivers can be converted in follow-up patches. Different devices are created for VGA/VESA/EFI FBs to allow multiple drivers to be loaded on distro kernels. We create: - "vesa-framebuffer" for VBE/VESA graphics FBs - "efi-framebuffer" for EFI FBs - "platform-framebuffer" for everything else This allows to load vesafb, efifb and others simultaneously and each picks up only the supported FB types. Apart from platform-framebuffer devices, this also introduces a compatibility option for "simple-framebuffer" drivers which recently got introduced for OF based systems. If CONFIG_X86_SYSFB is selected, we try to match the screen_info against a simple-framebuffer supported format. If we succeed, we create a "simple-framebuffer" device instead of a platform-framebuffer. This allows to reuse the simplefb.c driver across architectures and also to introduce a SimpleDRM driver. There is no need to have vesafb.c, efifb.c, simplefb.c and more just to have architecture specific quirks in their setup-routines. Instead, we now move the architecture specific quirks into x86-setup and provide a generic simple-framebuffer. For backwards-compatibility (if strange formats are used), we still allow vesafb/efifb to be loaded simultaneously and pick up all remaining devices. Signed-off-by: David Herrmann <dh.herrmann@gmail.com> Link: http://lkml.kernel.org/r/1375445127-15480-4-git-send-email-dh.herrmann@gmail.com Tested-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
41 lines
1.1 KiB
C
41 lines
1.1 KiB
C
#ifndef _ARCH_X86_KERNEL_SYSFB_H
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#define _ARCH_X86_KERNEL_SYSFB_H
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/*
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* Generic System Framebuffers on x86
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* Copyright (c) 2012-2013 David Herrmann <dh.herrmann@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/platform_data/simplefb.h>
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#include <linux/screen_info.h>
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#ifdef CONFIG_X86_SYSFB
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bool parse_mode(const struct screen_info *si,
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struct simplefb_platform_data *mode);
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int create_simplefb(const struct screen_info *si,
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const struct simplefb_platform_data *mode);
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#else /* CONFIG_X86_SYSFB */
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static inline bool parse_mode(const struct screen_info *si,
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struct simplefb_platform_data *mode)
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{
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return false;
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}
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static inline int create_simplefb(const struct screen_info *si,
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const struct simplefb_platform_data *mode)
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{
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return -EINVAL;
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}
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#endif /* CONFIG_X86_SYSFB */
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#endif /* _ARCH_X86_KERNEL_SYSFB_H */
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