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regulator: rpi-panel: Convert to drive lines directly

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The Atmel was doing a load of automatic sequencing of
control lines, however it was combining the touch controller's
reset with the bridge/panel control.

Change to control the control signals directly rather than
through the automatic POWERON control.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Signed-off-by: Detlev Casanova <detlev.casanova@collabora.com>
Link: https://lore.kernel.org/r/20220124220129.158891-6-detlev.casanova@collabora.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Dave Stevenson 2022-01-24 17:01:25 -05:00 committed by Mark Brown
parent 89339a2ae7
commit 4866e35e48
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 60 additions and 51 deletions
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111
drivers/regulator/rpi-panel-attiny-regulator.c
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@ -21,11 +21,28 @@
/* I2C registers of the Atmel microcontroller. */
#define REG_ID 0x80
#define REG_PORTA 0x81
#define REG_PORTA_HF BIT(2)
#define REG_PORTA_VF BIT(3)
#define REG_PORTB 0x82
#define REG_PORTC 0x83
#define REG_POWERON 0x85
#define REG_PWM 0x86
#define REG_ADDR_L 0x8c
#define REG_ADDR_H 0x8d
#define REG_WRITE_DATA_H 0x90
#define REG_WRITE_DATA_L 0x91
#define PA_LCD_DITHB BIT(0)
#define PA_LCD_MODE BIT(1)
#define PA_LCD_LR BIT(2)
#define PA_LCD_UD BIT(3)
#define PB_BRIDGE_PWRDNX_N BIT(0)
#define PB_LCD_VCC_N BIT(1)
#define PB_LCD_MAIN BIT(7)
#define PC_LED_EN BIT(0)
#define PC_RST_TP_N BIT(1)
#define PC_RST_LCD_N BIT(2)
#define PC_RST_BRIDGE_N BIT(3)
struct attiny_lcd {
/* lock to serialise overall accesses to the Atmel */
@ -37,99 +54,91 @@ static const struct regmap_config attiny_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.disable_locking = 1,
.max_register = REG_PWM,
.max_register = REG_WRITE_DATA_L,
.cache_type = REGCACHE_NONE,
};
static int attiny_lcd_power_enable(struct regulator_dev *rdev)
{
struct mutex *lock = rdev_get_drvdata(rdev);
unsigned int data;
int ret, i;
struct attiny_lcd *state = rdev_get_drvdata(rdev);
mutex_lock(lock);
mutex_lock(&state->lock);
regmap_write(rdev->regmap, REG_POWERON, 1);
msleep(80);
/* Wait for nPWRDWN to go low to indicate poweron is done. */
for (i = 0; i < 20; i++) {
ret = regmap_read(rdev->regmap, REG_PORTB, &data);
if (!ret) {
if (data & BIT(0))
break;
}
usleep_range(10000, 12000);
}
usleep_range(10000, 12000);
if (ret)
pr_err("%s: regmap_read_poll_timeout failed %d\n", __func__, ret);
/* Ensure bridge, and tp stay in reset */
regmap_write(rdev->regmap, REG_PORTC, 0);
usleep_range(5000, 10000);
/* Default to the same orientation as the closed source
* firmware used for the panel. Runtime rotation
* configuration will be supported using VC4's plane
* orientation bits.
*/
regmap_write(rdev->regmap, REG_PORTA, BIT(2));
regmap_write(rdev->regmap, REG_PORTA, PA_LCD_LR);
usleep_range(5000, 10000);
regmap_write(rdev->regmap, REG_PORTB, PB_LCD_MAIN);
usleep_range(5000, 10000);
/* Bring controllers out of reset */
regmap_write(rdev->regmap, REG_PORTC,
PC_LED_EN | PC_RST_BRIDGE_N | PC_RST_LCD_N | PC_RST_TP_N);
mutex_unlock(lock);
msleep(80);
regmap_write(rdev->regmap, REG_ADDR_H, 0x04);
usleep_range(5000, 8000);
regmap_write(rdev->regmap, REG_ADDR_L, 0x7c);
usleep_range(5000, 8000);
regmap_write(rdev->regmap, REG_WRITE_DATA_H, 0x00);
usleep_range(5000, 8000);
regmap_write(rdev->regmap, REG_WRITE_DATA_L, 0x00);
msleep(100);
mutex_unlock(&state->lock);
return 0;
}
static int attiny_lcd_power_disable(struct regulator_dev *rdev)
{
struct mutex *lock = rdev_get_drvdata(rdev);
struct attiny_lcd *state = rdev_get_drvdata(rdev);
mutex_lock(lock);
mutex_lock(&state->lock);
regmap_write(rdev->regmap, REG_PWM, 0);
regmap_write(rdev->regmap, REG_POWERON, 0);
usleep_range(5000, 10000);
regmap_write(rdev->regmap, REG_PORTA, 0);
usleep_range(5000, 10000);
regmap_write(rdev->regmap, REG_PORTB, PB_LCD_VCC_N);
usleep_range(5000, 10000);
regmap_write(rdev->regmap, REG_PORTC, 0);
msleep(30);
mutex_unlock(lock);
mutex_unlock(&state->lock);
return 0;
}
static int attiny_lcd_power_is_enabled(struct regulator_dev *rdev)
{
struct mutex *lock = rdev_get_drvdata(rdev);
struct attiny_lcd *state = rdev_get_drvdata(rdev);
unsigned int data;
int ret, i;
mutex_lock(lock);
mutex_lock(&state->lock);
for (i = 0; i < 10; i++) {
ret = regmap_read(rdev->regmap, REG_POWERON, &data);
if (!ret)
break;
usleep_range(10000, 12000);
}
if (ret < 0) {
mutex_unlock(lock);
return ret;
}
if (!(data & BIT(0))) {
mutex_unlock(lock);
return 0;
}
for (i = 0; i < 10; i++) {
ret = regmap_read(rdev->regmap, REG_PORTB, &data);
ret = regmap_read(rdev->regmap, REG_PORTC, &data);
if (!ret)
break;
usleep_range(10000, 12000);
}
mutex_unlock(lock);
mutex_unlock(&state->lock);
if (ret < 0)
return ret;
return data & BIT(0);
return data & PC_RST_BRIDGE_N;
}
static const struct regulator_init_data attiny_regulator_default = {
@ -256,7 +265,7 @@ static int attiny_i2c_probe(struct i2c_client *i2c,
config.regmap = regmap;
config.of_node = i2c->dev.of_node;
config.init_data = &attiny_regulator_default;
config.driver_data = &state->lock;
config.driver_data = state;
rdev = devm_regulator_register(&i2c->dev, &attiny_regulator, &config);
if (IS_ERR(rdev)) {