feat(lcd): add lcd_pwm_max_limit

huangcm

2025-07-03 571fede27a127398697e783a06a833e37b5b58c3

feat(lcd): add lcd_pwm_max_limit

 android/device/softwinner/ceres-c3/ceres_c3.mk
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@@ -333,7 +333,7 @@
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 # holding wake lock
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 PRODUCT_SYSTEM_DEFAULT_PROPERTIES += \
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-    persist.sys.kickpi_holding_wakelock=true
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+    persist.sys.kickpi_holding_wakelock=false
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 # stoarge
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 PRODUCT_SYSTEM_DEFAULT_PROPERTIES += \
 longan/brandy/brandy-2.0/u-boot-2018/drivers/video/sunxi/disp2/disp/de/disp_lcd.c
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@@ -15,6 +15,7 @@
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  *
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  */
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 #include "disp_lcd.h"
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+#include <linux/delay.h>
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 struct disp_lcd_private_data
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 {
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@@ -754,6 +755,14 @@
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 		ret = disp_sys_script_get_item(primary_key, sub_name, (int *)lcd_cfg->lcd_pin_power[i], 2);
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 	}
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+    sprintf(sub_name, "lcd_pwm_max_limit");
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+    ret = disp_sys_script_get_item(primary_key, sub_name, &value, 1);
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+    if (ret == 1) {
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+        lcd_cfg->lcd_pwm_max_limit = value;
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+    } else {
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+        lcd_cfg->lcd_pwm_max_limit = 255;
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+    }
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+
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 #ifdef __LINUX_PLAT__
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 //backlight adjust
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 	for (i = 0; i < 101; i++) {
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@@ -761,12 +770,12 @@
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 		lcd_cfg->backlight_curve_adjust[i] = 0;
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 		if (i == 100)
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-			lcd_cfg->backlight_curve_adjust[i] = 255;
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+			lcd_cfg->backlight_curve_adjust[i] = lcd_cfg->lcd_pwm_max_limit;
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 		ret = disp_sys_script_get_item(primary_key, sub_name, &value, 1);
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 		if (ret == 1) {
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 			value = (value > 100)? 100:value;
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-			value = value * 255 / 100;
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+			value = value * lcd_cfg->lcd_pwm_max_limit / 100;
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 			lcd_cfg->backlight_curve_adjust[i] = value;
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 		}
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 	}
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@@ -774,7 +783,7 @@
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 	sprintf(sub_name, "lcd_backlight");
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 	ret = disp_sys_script_get_item(primary_key, sub_name, &value, 1);
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 	if (ret == 1) {
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-		value = (value > 256)? 256:value;
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+		value = (value > lcd_cfg->lcd_pwm_max_limit)? lcd_cfg->lcd_pwm_max_limit:value;
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 		lcd_cfg->backlight_bright = value;
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 	} else {
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 		lcd_cfg->backlight_bright = 197;
 longan/brandy/brandy-2.0/u-boot-2018/drivers/video/sunxi/disp2/disp/de/disp_lcd.h
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@@ -55,6 +55,7 @@
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 	u32                   lcd_contrast;
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 	u32                   lcd_saturation;
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 	u32                   lcd_hue;
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+    u32                   lcd_pwm_max_limit;
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 }disp_lcd_cfg;
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 s32 disp_init_lcd(disp_bsp_init_para * para);
 longan/kernel/linux-4.9/drivers/video/fbdev/sunxi/disp2/disp/de/disp_lcd.c
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@@ -456,19 +456,27 @@
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 					     2);
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 	}
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+    sprintf(sub_name, "lcd_pwm_max_limit");
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+    ret = disp_sys_script_get_item(primary_key, sub_name, &value, 1);
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+    if (ret == 1) {
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+        lcd_cfg->lcd_pwm_max_limit = value;
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+    } else {
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+        lcd_cfg->lcd_pwm_max_limit = 255;
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+    }
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+
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 /* backlight adjust */
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 	for (i = 0; i < 101; i++) {
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 		sprintf(sub_name, "lcd_bl_%d_percent", i);
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 		lcd_cfg->backlight_curve_adjust[i] = 0;
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 		if (i == 100)
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-			lcd_cfg->backlight_curve_adjust[i] = 255;
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+			lcd_cfg->backlight_curve_adjust[i] = lcd_cfg->lcd_pwm_max_limit;
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 		ret =
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 		    disp_sys_script_get_item(primary_key, sub_name, &value, 1);
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 		if (ret == 1) {
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 			value = (value > 100) ? 100 : value;
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-			value = value * 255 / 100;
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+			value = value * lcd_cfg->lcd_pwm_max_limit / 100;
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 			lcd_cfg->backlight_curve_adjust[i] = value;
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 		}
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 	}
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@@ -476,7 +484,7 @@
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 	sprintf(sub_name, "lcd_backlight");
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 	ret = disp_sys_script_get_item(primary_key, sub_name, &value, 1);
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 	if (ret == 1) {
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-		value = (value > 256) ? 256 : value;
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+		value = (value > lcd_cfg->lcd_pwm_max_limit) ? lcd_cfg->lcd_pwm_max_limit : value;
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 		lcd_cfg->backlight_bright = value;
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 	} else {
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 		lcd_cfg->backlight_bright = 197;
 longan/kernel/linux-4.9/drivers/video/fbdev/sunxi/disp2/disp/de/disp_lcd.h
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@@ -55,6 +55,7 @@
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 	u32 lcd_contrast;
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 	u32 lcd_saturation;
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 	u32 lcd_hue;
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+    u32 lcd_pwm_max_limit;
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 };
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 s32 disp_init_lcd(struct disp_bsp_init_para *para);