s3fb: add DDC support

Add I2C support for the DDC bus and also default mode initialization by
reading monitor EDID to the s3fb driver.

Tested on Trio64V+ (2 cards), Trio64V2/DX, Virge (3 cards),
Virge/DX (3 cards), Virge/GX2, Trio3D/2X (4 cards), Trio3D.

Will probably not work on Trio32 - my 2 cards have DDC support in BIOS that
looks different from the other cards but the DDC pins on the VGA connector
are not connected.

Signed-off-by: Ondrej Zary <linux@rainbow-software.org>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index e6a8d8c0101d..e2126b5af1de 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -1463,6 +1463,14 @@ config FB_S3
         ---help---
           Driver for graphics boards with S3 Trio / S3 Virge chip.
 
+config FB_S3_DDC
+        bool "DDC for S3 support"
+        depends on FB_S3
+        select FB_DDC
+        default y
+        help
+          Say Y here if you want DDC support for your S3 graphics card.
+
 config FB_SAVAGE
         tristate "S3 Savage support"
         depends on FB && PCI && EXPERIMENTAL