Add DDC support for Trident cards.

Tested on TGUI9440, TGUI9680, 3DImage 9750, Blade3D 9880 and Blade XP.

Signed-off-by: Ondrej Zary <redacted>
---
 drivers/video/fbdev/Kconfig     |    9 ++
 drivers/video/fbdev/tridentfb.c |  192 ++++++++++++++++++++++++++++++++++++++-
 2 files changed, 196 insertions(+), 5 deletions(-)

diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig
index 2d98de5..e2531b8 100644
--- a/drivers/video/fbdev/Kconfig
+++ b/drivers/video/fbdev/Kconfig

@@ -1680,6 +1680,15 @@ config FB_TRIDENT
 	  To compile this driver as a module, choose M here: the
 	  module will be called tridentfb.
 
+config FB_TRIDENT_DDC
+	bool "DDC for Trident support"
+	depends on FB_TRIDENT
+	select FB_DDC
+	select FB_MODE_HELPERS
+	default y
+	help
+	  Say Y here if you want DDC support for your Trident graphics card.
+