/*
* read EDID record , pass it to callback function to interpret.
* callback function will store it for further use by calling
* function; it will also decide if we need to reread it
*/
static unsigned char *
EDIDRead_DDC1(ScrnInfoPtr pScrn, DDC1SetSpeedProc DDCSpeed,
unsigned int (*read_DDC) (ScrnInfoPtr))
{
unsigned char *EDID_block = NULL;
int count = RETRIES;
if (!read_DDC) {
xf86DrvMsg(pScrn->scrnIndex, X_PROBED,
"chipset doesn't support DDC1\n");
return NULL;
};
if (TestDDC1(pScrn, read_DDC) == -1) {
xf86DrvMsg(pScrn->scrnIndex, X_PROBED, "No DDC signal\n");
return NULL;
};
if (DDCSpeed)
DDCSpeed(pScrn, DDC_FAST);
do {
EDID_block = GetEDID_DDC1(FetchEDID_DDC1(pScrn, read_DDC));
count--;
} while (!EDID_block && count);
if (DDCSpeed)
DDCSpeed(pScrn, DDC_SLOW);
return EDID_block;
}
/*
* read EDID record , pass it to callback function to interpret.
* callback function will store it for further use by calling
* function; it will also decide if we need to reread it
*/
static unsigned char *
EDIDRead_DDC1(ScrnInfoPtr pScrn, void (*DDCSpeed)(ScrnInfoPtr,xf86ddcSpeed),
unsigned int (*read_DDC)(ScrnInfoPtr))
{
unsigned char *EDID_block = NULL;
int count = RETRIES;
if (!read_DDC) {
LOG("chipset doesn't support DDC1\n");
return NULL;
};
if (TestDDC1(pScrn,read_DDC)==-1) {
LOG("No DDC signal\n");
return NULL;
};
if (DDCSpeed) DDCSpeed(pScrn,DDC_FAST);
do {
EDID_block = GetEDID_DDC1(FetchEDID_DDC1(pScrn,read_DDC));
count --;
} while (!EDID_block && count);
if (DDCSpeed) DDCSpeed(pScrn,DDC_SLOW);
return EDID_block;
}