diff options
| author | Priyanka Jain <priyanka.jain@nxp.com> | 2018-10-11 05:11:23 +0000 |
|---|---|---|
| committer | York Sun <york.sun@nxp.com> | 2018-12-06 14:37:19 -0800 |
| commit | df182a42a45a1db76a4e0a3346947e31f70dc26a (patch) | |
| tree | cfd8ea434a141781a10669c761e8c111ad48ae4e | |
| parent | 4c9d4a75f12f9ae7a1164f62cee532ef7a48e5f5 (diff) | |
| download | u-boot-df182a42a45a1db76a4e0a3346947e31f70dc26a.tar.gz | |
board/freescale/vid: Add correction for ltc3882 read error.
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>
| -rw-r--r-- | board/freescale/common/vid.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/board/freescale/common/vid.c b/board/freescale/common/vid.c index eb5cf88dd2..db158cb2c2 100644 --- a/board/freescale/common/vid.c +++ b/board/freescale/common/vid.c @@ -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; } |