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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2006-11-17 15:35:00 +1100
committerLinus Torvalds <torvalds@woody.osdl.org>2006-11-16 21:59:41 -0800
commit4f71c5de19c27f2198105d3b26b398494d5c353b (patch)
tree63373038978d4b5052a29667ede7591267154269 /drivers/video
parent1b9bb3c14c60324b54645ffefbe6d270f9fd191c (diff)
[PATCH] Fix radeon DDC regression
When radeonfb was changed to use the new "generic" ddc, a bit of code initializing the GPIO lines was lost, causing it to not work if the firmware didn't configure them properly, which seems to happen on some cards. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/video')
-rw-r--r--drivers/video/aty/radeon_i2c.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/video/aty/radeon_i2c.c b/drivers/video/aty/radeon_i2c.c
index 676754520099..869725a13c21 100644
--- a/drivers/video/aty/radeon_i2c.c
+++ b/drivers/video/aty/radeon_i2c.c
@@ -139,7 +139,13 @@ void radeon_delete_i2c_busses(struct radeonfb_info *rinfo)
int radeon_probe_i2c_connector(struct radeonfb_info *rinfo, int conn,
u8 **out_edid)
{
- u8 *edid = fb_ddc_read(&rinfo->i2c[conn-1].adapter);
+ u32 reg = rinfo->i2c[conn-1].ddc_reg;
+ u8 *edid;
+
+ OUTREG(reg, INREG(reg) &
+ ~(VGA_DDC_DATA_OUTPUT | VGA_DDC_CLK_OUTPUT));
+
+ edid = fb_ddc_read(&rinfo->i2c[conn-1].adapter);
if (out_edid)
*out_edid = edid;