[PATCH] fbdev: Make BIOS EDID reading configurable
DDC reading via the Video BIOS may take several tens of seconds with some
combination of display cards and monitors.
Make this option configurable. It defaults to `y' to minimise disruption.
Signed-off-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/arch/i386/boot/video.S b/arch/i386/boot/video.S
index 2ac40c8..0000a26 100644
--- a/arch/i386/boot/video.S
+++ b/arch/i386/boot/video.S
@@ -1924,6 +1924,7 @@
ret
store_edid:
+#ifdef CONFIG_FB_FIRMWARE_EDID
pushw %es # just save all registers
pushw %ax
pushw %bx
@@ -1954,6 +1955,7 @@
popw %bx
popw %ax
popw %es
+#endif
ret
# VIDEO_SELECT-only variables
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index 3a89061..22e9d69 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -70,6 +70,22 @@
depends on FB
default n
+config FB_FIRMWARE_EDID
+ bool "Enable firmware EDID"
+ depends on FB
+ default y
+ ---help---
+ This enables access to the EDID transferred from the firmware.
+ On the i386, this is from the Video BIOS. Enable this if DDC/I2C
+ transfers do not work for your driver and if you are using
+ nvidiafb, i810fb or savagefb.
+
+ In general, choosing Y for this option is safe. If you
+ experience extremely long delays while booting before you get
+ something on your display, try setting this to N. Matrox cards in
+ combination with certain motherboards and monitors are known to
+ suffer from this problem.
+
config FB_MODE_HELPERS
bool "Enable Video Mode Handling Helpers"
depends on FB
diff --git a/drivers/video/fbmon.c b/drivers/video/fbmon.c
index 7c74e73..53beeb4 100644
--- a/drivers/video/fbmon.c
+++ b/drivers/video/fbmon.c
@@ -1281,7 +1281,7 @@
-EINVAL : 0;
}
-#if defined(__i386__)
+#if defined(CONFIG_FB_FIRMWARE_EDID) && defined(__i386__)
#include <linux/pci.h>
/*
@@ -1311,11 +1311,11 @@
{
return NULL;
}
-#endif /* _i386_ */
+#endif
+EXPORT_SYMBOL(fb_firmware_edid);
EXPORT_SYMBOL(fb_parse_edid);
EXPORT_SYMBOL(fb_edid_to_monspecs);
-EXPORT_SYMBOL(fb_firmware_edid);
EXPORT_SYMBOL(fb_get_mode);
EXPORT_SYMBOL(fb_validate_mode);
EXPORT_SYMBOL(fb_destroy_modedb);
