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Slow down DDC I2C bus using a RiseFallTime of 20us for old monitors.

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This time value makes the bus run slowly enough for even the least reliable
of monitors. Thanks to Pavel Troller for finding the necessary change.
This commit is contained in:
Keith Packard 2007-03-17 20:14:05 -07:00
parent 52fccb9d9f
commit 0f80340a52
1 changed files with 6 additions and 0 deletions
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6
hw/xfree86/ddc/xf86DDC.c
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@ -337,6 +337,12 @@ DDCRead_DDC2(int scrnIndex, I2CBusPtr pBus, int start, int len)
unsigned char *R_Buffer;
int i;
/*
* Slow down the bus so that older monitors don't
* miss things.
*/
pBus->RiseFallTime = 20;
if (!(dev = xf86I2CFindDev(pBus, 0x00A0))) {
dev = xf86CreateI2CDevRec();
dev->DevName = "ddc2";