Reply to 芯片T153，PWM占空比设置为0出现的问题 on Thu, 19 Mar 2026 03:20:53 GMT

fuzi2006 — Thu, 19 Mar 2026 03:20:53 GMT

我在另外一个平台上遇到开关 LVDS 背光使能控制
关闭背光使能 disp驱动会调用PWM失能；
再次开启背光虽然软件调用 PWM 使能；但是实际 PWM 无功能。

drivers/video/sunxi/disp2/disp/dev_disp.c
        case DISP_LCD_BACKLIGHT_ENABLE:
                {
                        if (mgr && mgr->device) {
-                               if (mgr->device->pwm_enable)
-                                       mgr->device->pwm_enable(mgr->device);
+                               // if (mgr->device->pwm_enable) 不重复控制PWM开关
+                               //      mgr->device->pwm_enable(mgr->device);
                                if (mgr->device->backlight_enable)
                                        mgr->device->backlight_enable(mgr->device);


        case DISP_LCD_BACKLIGHT_DISABLE:
                {
                        if (mgr && mgr->device) {
-                               if (mgr->device->pwm_disable)
-                                       mgr->device->pwm_disable(mgr->device);
+                               // if (mgr->device->pwm_disable) 不重复控制PWM开关
+                               //      mgr->device->pwm_disable(mgr->device);
                                if (mgr->device->backlight_disable)
                                        mgr->device->backlight_disable(mgr->device);
                                return 0;