regulator: fan53555: fix TCS4525 voltage calulation

The TCS4525 has 128 voltage steps. With the calculation set to 127 the
most significant bit is disregarded which leads to a miscalculation of
the voltage by about 200mv.

Fix the calculation to end deadlock on the rk3566-quartz64 which uses
this as the cpu regulator.

Fixes: 914df8faa7d6 ("regulator: fan53555: Add TCS4525 DCDC support")
Signed-off-by: Peter Geis <pgwipeout@gmail.com>
Link: https://lore.kernel.org/r/20210511211335.2935163-2-pgwipeout@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/regulator/fan53555.c b/drivers/regulator/fan53555.c
index f3918f0..26f06f6 100644 (file)
--- a/drivers/regulator/fan53555.c
+++ b/drivers/regulator/fan53555.c
@@ -55,7 +55,6 @@
 
 #define FAN53555_NVOLTAGES     64      /* Numbers of voltages */
 #define FAN53526_NVOLTAGES     128
-#define TCS4525_NVOLTAGES      127     /* Numbers of voltages */
 
 #define TCS_VSEL_NSEL_MASK     0x7f
 #define TCS_VSEL0_MODE         (1 << 7)
@@ -376,7 +375,7 @@ static int fan53555_voltages_setup_tcs(struct fan53555_device_info *di)
        /* Init voltage range and step */
        di->vsel_min = 600000;
        di->vsel_step = 6250;
-       di->vsel_count = TCS4525_NVOLTAGES;
+       di->vsel_count = FAN53526_NVOLTAGES;
 
        return 0;
 }