diff options
| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2005-03-30 16:42:14 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-03-30 16:42:14 -0800 |
| commit | 47b343b318bdc258739c3c4c486fa1d8fbcab12b (patch) | |
| tree | d84ebf2e3c8b9e7a75949150aebf32288d01a3c8 | |
| parent | f55b27076a1c00b1374cd22cb295d7671eff27ee (diff) | |
| download | history-47b343b318bdc258739c3c4c486fa1d8fbcab12b.tar.gz | |
[PATCH] radeonfb: DDC i2c fix
The radeonfb code for DDC probing (like it's X.org counterpart) uses to
leave the DDC clock & data lines asserted after the probing is complete.
This causes problems with some Apple monitors like the new Cinema HD 23",
who will turn themselves off when that happens. This fixes it.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| -rw-r--r-- | drivers/video/aty/radeon_i2c.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/video/aty/radeon_i2c.c b/drivers/video/aty/radeon_i2c.c index e87ef153d87bb4..762244164c81a9 100644 --- a/drivers/video/aty/radeon_i2c.c +++ b/drivers/video/aty/radeon_i2c.c @@ -236,6 +236,12 @@ int radeon_probe_i2c_connector(struct radeonfb_info *rinfo, int conn, u8 **out_e if (edid) break; } + /* Release the DDC lines when done or the Apple Cinema HD display + * will switch off + */ + OUTREG(reg, INREG(reg) & ~(VGA_DDC_CLK_OUT_EN | VGA_DDC_DATA_OUT_EN)); + (void)INREG(reg); + if (out_edid) *out_edid = edid; if (!edid) { |