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board/freescale/vid: Add correction for ltc3882 read error.

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Voltage regulator LTC3882 device has 0.5% voltage read error.
So for NXP SoC devices this generally equates to 2mV

Update set_voltage_to_LTC for below:
1.Add coorection of upto 2mV in voltage comparison
  to take care of voltage read error of voltage regulator
2.Add loop max count kept as 100 to avoid infinte loop.

Signed-off-by: Priyanka Jain <priyanka.jain@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>
This commit is contained in:
Priyanka Jain 2018-10-11 05:11:23 +00:00 committed by York Sun
parent 4c9d4a75f1
commit df182a42a4
1 changed files with 4 additions and 1 deletions
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5
board/freescale/common/vid.c
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@ -318,6 +318,7 @@ static int set_voltage_to_IR(int i2caddress, int vdd)
static int set_voltage_to_LTC(int i2caddress, int vdd)
{
int ret, vdd_last, vdd_target = vdd;
int count = 100, temp = 0;
/* Scale up to the LTC resolution is 1/4096V */
vdd = (vdd * 4096) / 1000;
@ -343,7 +344,9 @@ static int set_voltage_to_LTC(int i2caddress, int vdd)
printf("VID: Couldn't read sensor abort VID adjust\n");
return -1;
}
} while (vdd_last != vdd_target);
count--;
temp = vdd_last - vdd_target;
} while ((abs(temp) > 2) && (count > 0));
return vdd_last;
}