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nwze370: improve lcd & backlight

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Added lcd inversion
Fix issue where backlight would turn on before first frame rendered
Fix issue where backlight would shortly appear at 100% before PWM is
ready during fade in
Turn off backlight before booting/RoLo/shutdown to avoid it being
enabled on next boot
Fix issue where fade in isn't smooth because brightness levels below 13 were
basically equalivent to off, by removing these brightness levels

Change-Id: I868eae2cbeea52c6af7d09c886958ff46167fe26
This commit is contained in:
nift4 2025-10-21 19:39:11 +02:00 • committed by William Wilgus
parent 9722cad478
commit b1511738f7
5 changed files with 47 additions and 15 deletions
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16
firmware/target/arm/imx233/sony-nwz/backlight-nwz.c
View file

@ -26,12 +26,20 @@
#include "backlight-target.h"
#include "pwm-imx233.h"
#include "pinctrl-imx233.h"
#include "kernel.h"
static int last_brightness;
void backlight_hw_brightness(int brightness)
{
bool en = brightness > 0;
imx233_pwm_setup_simple(2, 24000, 100 - brightness);
/* brightness has extreme dip above 88% duty cycle, limit range to [87%, 0%] */
if (en)
imx233_pwm_setup_simple(2, 24000, 88 - brightness);
imx233_pwm_enable(2, en);
if (last_brightness == 0 && en)
sleep(HZ / 25); /* make sure PWM settings are applied */
last_brightness = brightness;
imx233_pinctrl_set_gpio(0, 10, en);
}
@ -40,9 +48,8 @@ bool backlight_hw_init(void)
imx233_pinctrl_acquire(0, 10, "backlight_enable");
imx233_pinctrl_set_function(0, 10, PINCTRL_FUNCTION_GPIO);
imx233_pinctrl_enable_gpio(0, 10, true);
imx233_pinctrl_set_gpio(0, 10, true);
backlight_hw_brightness(DEFAULT_BRIGHTNESS_SETTING);
return true;
backlight_hw_brightness(0);
return false;
}
void backlight_hw_on(void)
@ -50,6 +57,7 @@ void backlight_hw_on(void)
#ifdef HAVE_LCD_ENABLE
lcd_enable(true); /* power on lcd + visible display */
#endif
sleep(HZ / 10); /* make sure screen is not white anymore */
/* don't do anything special, the core will set the brightness */
}