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47 lines
1.4 KiB
Diff
47 lines
1.4 KiB
Diff
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From 76035ed0bd7fcc2c0af5a038139b50231b95fa37 Mon Sep 17 00:00:00 2001
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From: Dave Stevenson <dave.stevenson@raspberrypi.com>
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Date: Mon, 29 Nov 2021 18:31:37 +0000
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Subject: [PATCH] regulator/rpi-panel-attiny: Don't read the LCD power
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status
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The I2C to the Atmel is very fussy, and locks up easily on
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Pi0-3 particularly on reads.
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The LCD power status is controlled solely by this driver, so
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rather than reading it back from the Atmel, use the cached
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status last set.
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Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
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---
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drivers/regulator/rpi-panel-attiny-regulator.c | 18 +-----------------
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1 file changed, 1 insertion(+), 17 deletions(-)
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--- a/drivers/regulator/rpi-panel-attiny-regulator.c
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+++ b/drivers/regulator/rpi-panel-attiny-regulator.c
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@@ -144,24 +144,8 @@ static int attiny_lcd_power_disable(stru
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static int attiny_lcd_power_is_enabled(struct regulator_dev *rdev)
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{
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struct attiny_lcd *state = rdev_get_drvdata(rdev);
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- unsigned int data;
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- int ret, i;
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- mutex_lock(&state->lock);
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-
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- for (i = 0; i < 10; i++) {
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- ret = regmap_read(rdev->regmap, REG_PORTC, &data);
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- if (!ret)
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- break;
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- usleep_range(10000, 12000);
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- }
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-
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- mutex_unlock(&state->lock);
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-
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- if (ret < 0)
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- return ret;
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-
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- return data & PC_RST_BRIDGE_N;
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+ return state->port_states[REG_PORTC - REG_PORTA] & PC_RST_BRIDGE_N;
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}
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static const struct regulator_init_data attiny_regulator_default = {
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