feat(lcd): add lcd_pwm_max_limit

huangcm

2025-07-03 571fede27a127398697e783a06a833e37b5b58c3

 longan/kernel/linux-4.9/drivers/video/fbdev/sunxi/disp2/disp/de/disp_lcd.h
..
..
@@ -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);