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Input: ti_am335x_tsc - set ADCREFM for X configuration

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As reported by the STEPCONFIG[1-16] registered field descriptions of the
TI reference manual, for the ADC "in single ended, SEL_INM_SWC_3_0 must
be 1xxx".

Unlike the Y and Z coordinates, this bit has not been set for the step
configuration registers used to sample the X coordinate.

Fixes: 1b8be32e69 ("Input: add support for TI Touchscreen controller")
Signed-off-by: Dario Binacchi <dariobin@libero.it>
Link: https://lore.kernel.org/r/20211212125358.14416-2-dariobin@libero.it
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Dario Binacchi 2021-12-12 21:14:35 -08:00 • committed by Dmitry Torokhov
parent 046612a3f5
commit 73cca71a90
1 changed files with 2 additions and 1 deletions
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3
drivers/input/touchscreen/ti_am335x_tsc.c
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@ -131,7 +131,8 @@ static void titsc_step_config(struct titsc *ts_dev)
u32 stepenable;
config = STEPCONFIG_MODE_HWSYNC |
STEPCONFIG_AVG_16 | ts_dev->bit_xp;
STEPCONFIG_AVG_16 | ts_dev->bit_xp |
STEPCONFIG_INM_ADCREFM;
switch (ts_dev->wires) {
case 4:
config |= STEPCONFIG_INP(ts_dev->inp_yp) | ts_dev->bit_xn;