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authorAntonino A. Daplas <adaplas@gmail.com>2005-09-09 13:04:34 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-09-09 13:57:59 -0700
commit5e518d7672dea4cd7c60871e40d0490c52f01d13 (patch)
treea97dc33b2ce9a0553fb6b9b3206ee7674ae4d06a
parent53eed4ec8bcd8701b9135859ec46b10a0d88ba25 (diff)
[PATCH] fbdev: Resurrect hooks to get EDID from firmware
For the i386, code is already present in video.S that gets the EDID from the video BIOS. Make this visible so drivers can also use this data as fallback when i2c does not work. To ensure that the EDID block is returned for the primary graphics adapter only, by check if the IORESOURCE_ROM_SHADOW flag is set. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--arch/i386/boot/video.S2
-rw-r--r--arch/i386/kernel/setup.c1
-rw-r--r--drivers/video/fbmon.c35
-rw-r--r--include/linux/fb.h4
4 files changed, 39 insertions, 3 deletions
diff --git a/arch/i386/boot/video.S b/arch/i386/boot/video.S
index 02bf625a681b..92f669470142 100644
--- a/arch/i386/boot/video.S
+++ b/arch/i386/boot/video.S
@@ -1949,7 +1949,7 @@ store_edid:
movw $0x4f15, %ax # do VBE/DDC
movw $0x01, %bx
movw $0x00, %cx
- movw $0x01, %dx
+ movw $0x00, %dx
movw $0x140, %di
int $0x10
diff --git a/arch/i386/kernel/setup.c b/arch/i386/kernel/setup.c
index a659d274914c..fa0c69eb937a 100644
--- a/arch/i386/kernel/setup.c
+++ b/arch/i386/kernel/setup.c
@@ -139,6 +139,7 @@ struct sys_desc_table_struct {
unsigned char table[0];
};
struct edid_info edid_info;
+EXPORT_SYMBOL_GPL(edid_info);
struct ist_info ist_info;
#if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
diff --git a/drivers/video/fbmon.c b/drivers/video/fbmon.c
index c2718bb94949..791bec3d672a 100644
--- a/drivers/video/fbmon.c
+++ b/drivers/video/fbmon.c
@@ -29,6 +29,7 @@
#include <linux/tty.h>
#include <linux/fb.h>
#include <linux/module.h>
+#include <video/edid.h>
#ifdef CONFIG_PPC_OF
#include <linux/pci.h>
#include <asm/prom.h>
@@ -1251,9 +1252,41 @@ int fb_validate_mode(const struct fb_var_screeninfo *var, struct fb_info *info)
-EINVAL : 0;
}
+#if defined(__i386__)
+#include <linux/pci.h>
+
+/*
+ * We need to ensure that the EDID block is only returned for
+ * the primary graphics adapter.
+ */
+
+const unsigned char *fb_firmware_edid(struct device *device)
+{
+ struct pci_dev *dev = NULL;
+ struct resource *res = NULL;
+ unsigned char *edid = NULL;
+
+ if (device)
+ dev = to_pci_dev(device);
+
+ if (dev)
+ res = &dev->resource[PCI_ROM_RESOURCE];
+
+ if (res && res->flags & IORESOURCE_ROM_SHADOW)
+ edid = edid_info.dummy;
+
+ return edid;
+}
+#else
+const unsigned char *fb_firmware_edid(struct device *device)
+{
+ return NULL;
+}
+#endif /* _i386_ */
+
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);
diff --git a/include/linux/fb.h b/include/linux/fb.h
index 70da819df0f5..e3e16f43b1bb 100644
--- a/include/linux/fb.h
+++ b/include/linux/fb.h
@@ -859,7 +859,9 @@ extern int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var,
extern int fb_validate_mode(const struct fb_var_screeninfo *var,
struct fb_info *info);
extern int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var);
-extern void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs);
+extern const unsigned char *fb_firmware_edid(struct device *device);
+extern void fb_edid_to_monspecs(unsigned char *edid,
+ struct fb_monspecs *specs);
extern void fb_destroy_modedb(struct fb_videomode *modedb);
/* drivers/video/modedb.c */