From 16c9c73f91896fdd22b6821ae08e121d01da4aad Mon Sep 17 00:00:00 2001 From: Dave Stevenson Date: Mon, 29 Nov 2021 18:31:37 +0000 Subject: [PATCH 0322/1085] regulator/rpi-panel-attiny: Don't read the LCD power status 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 cached status last set. Signed-off-by: Dave Stevenson --- drivers/regulator/rpi-panel-attiny-regulator.c | 18 +----------------- 1 file changed, 1 insertion(+), 17 deletions(-) --- a/drivers/regulator/rpi-panel-attiny-regulator.c +++ b/drivers/regulator/rpi-panel-attiny-regulator.c @@ -143,24 +143,8 @@ static int attiny_lcd_power_disable(stru static int attiny_lcd_power_is_enabled(struct regulator_dev *rdev) { struct attiny_lcd *state = rdev_get_drvdata(rdev); - unsigned int data; - int ret, i; - mutex_lock(&state->lock); - - for (i = 0; i < 10; i++) { - ret = regmap_read(rdev->regmap, REG_PORTC, &data); - if (!ret) - break; - usleep_range(10000, 12000); - } - - mutex_unlock(&state->lock); - - if (ret < 0) - return ret; - - return data & PC_RST_BRIDGE_N; + return state->port_states[REG_PORTC - REG_PORTA] & PC_RST_BRIDGE_N; } static const struct regulator_init_data attiny_regulator_default = {