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regulator/rpi-panel-attiny: Use the regmap cache

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The I2C to the Atmel is very fussy, and locks up easily on
Pi0-3 particularly on reads.

The LCD power status is controlled solely by this driver, so
rather than reading it back from the Atmel, use the regmap cache
to avoid reading values.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Signed-off-by: Detlev Casanova <detlev.casanova@collabora.com>
Link: https://lore.kernel.org/r/20220124220129.158891-9-detlev.casanova@collabora.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Dave Stevenson 2022-01-24 17:01:28 -05:00 committed by Mark Brown
parent 1d746d448f
commit 5fa4e8ea64
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1 changed files with 1 additions and 1 deletions
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drivers/regulator/rpi-panel-attiny-regulator.c
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@ -76,7 +76,7 @@ static const struct regmap_config attiny_regmap_config = {
.val_bits = 8, .val_bits = 8,
.disable_locking = 1, .disable_locking = 1,
.max_register = REG_WRITE_DATA_L, .max_register = REG_WRITE_DATA_L,
.cache_type = REGCACHE_NONE, .cache_type = REGCACHE_RBTREE,
}; };
static int attiny_set_port_state(struct attiny_lcd *state, int reg, u8 val) static int attiny_set_port_state(struct attiny_lcd *state, int reg, u8 val)