[PATCH] fbdev: Firmware EDID fixes
- make firmware edid independent from framebuffer (No need to choose framebuffer just to disable this option - enable this option in X86_64 - check if VBE/DDC function is implemented before calling actual function Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Antonino A. Daplas
Linus Torvalds
parent
026fbe16c2
commit
ba70710e59
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@ -1929,7 +1929,7 @@ skip10: movb %ah, %al
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ret
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store_edid:
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#ifdef CONFIG_FB_FIRMWARE_EDID
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#ifdef CONFIG_FIRMWARE_EDID
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pushw %es # just save all registers
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pushw %ax
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pushw %bx
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@ -1947,6 +1947,22 @@ store_edid:
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rep
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stosl
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pushw %es # save ES
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xorw %di, %di # Report Capability
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pushw %di
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popw %es # ES:DI must be 0:0
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movw $0x4f15, %ax
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xorw %bx, %bx
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xorw %cx, %cx
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int $0x10
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popw %es # restore ES
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cmpb $0x00, %ah # call successful
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jne no_edid
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cmpb $0x4f, %al # function supported
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jne no_edid
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movw $0x4f15, %ax # do VBE/DDC
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movw $0x01, %bx
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movw $0x00, %cx
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@ -1954,6 +1970,7 @@ store_edid:
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movw $0x140, %di
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int $0x10
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no_edid:
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popw %di # restore all registers
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popw %dx
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popw %cx
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@ -1929,6 +1929,7 @@ skip10: movb %ah, %al
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ret
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store_edid:
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#ifdef CONFIG_FIRMWARE_EDID
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pushw %es # just save all registers
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pushw %ax
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pushw %bx
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@ -1946,6 +1947,22 @@ store_edid:
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rep
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stosl
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pushw %es # save ES
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xorw %di, %di # Report Capability
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pushw %di
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popw %es # ES:DI must be 0:0
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movw $0x4f15, %ax
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xorw %bx, %bx
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xorw %cx, %cx
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int $0x10
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popw %es # restore ES
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cmpb $0x00, %ah # call successful
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jne no_edid
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cmpb $0x4f, %al # function supported
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jne no_edid
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movw $0x4f15, %ax # do VBE/DDC
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movw $0x01, %bx
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movw $0x00, %cx
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@ -1953,12 +1970,14 @@ store_edid:
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movw $0x140, %di
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int $0x10
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no_edid:
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popw %di # restore all registers
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popw %dx
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popw %cx
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popw %bx
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popw %ax
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popw %es
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#endif
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ret
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# VIDEO_SELECT-only variables
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@ -109,6 +109,7 @@ struct sys_desc_table_struct {
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};
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struct edid_info edid_info;
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EXPORT_SYMBOL_GPL(edid_info);
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struct e820map e820;
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extern int root_mountflags;
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@ -4,6 +4,21 @@
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menu "Graphics support"
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config FIRMWARE_EDID
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bool "Enable firmware EDID"
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default y
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---help---
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This enables access to the EDID transferred from the firmware.
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On the i386, this is from the Video BIOS. Enable this if DDC/I2C
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transfers do not work for your driver and if you are using
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nvidiafb, i810fb or savagefb.
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In general, choosing Y for this option is safe. If you
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experience extremely long delays while booting before you get
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something on your display, try setting this to N. Matrox cards in
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combination with certain motherboards and monitors are known to
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suffer from this problem.
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config FB
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tristate "Support for frame buffer devices"
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---help---
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@ -70,22 +85,6 @@ config FB_MACMODES
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depends on FB
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default n
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config FB_FIRMWARE_EDID
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bool "Enable firmware EDID"
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depends on FB
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default y
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---help---
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This enables access to the EDID transferred from the firmware.
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On the i386, this is from the Video BIOS. Enable this if DDC/I2C
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transfers do not work for your driver and if you are using
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nvidiafb, i810fb or savagefb.
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In general, choosing Y for this option is safe. If you
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experience extremely long delays while booting before you get
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something on your display, try setting this to N. Matrox cards in
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combination with certain motherboards and monitors are known to
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suffer from this problem.
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config FB_BACKLIGHT
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bool
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depends on FB
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@ -1301,7 +1301,7 @@ int fb_validate_mode(const struct fb_var_screeninfo *var, struct fb_info *info)
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-EINVAL : 0;
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}
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#if defined(CONFIG_FB_FIRMWARE_EDID) && defined(__i386__)
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#if defined(CONFIG_FIRMWARE_EDID) && defined(CONFIG_X86)
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/*
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* We need to ensure that the EDID block is only returned for
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