FAQ0200009：AW9364调光过程中有亮暗跳变问题 | FAQ

在调光代码中添加spinlock 解决

#define MAX_LEVEL 240

#define MIN_LEVEL 15

static void gpio_bl_set(struct mdss_panel_data *pdata,u32 bl_level)

{

static int old_brightness = 0;

int new_brightness = bl_level;

static int brightness_level = 0;

int i;

int old_count = 0; //当前上升沿个数

int new_count = 0; //目标上升沿个数

int total_count = 0; //需要调节的脉冲数

struct mdss_dsi_ctrl_pdata *ctrl_pdata = NULL;

unsigned long flags;

ctrl_pdata = container_of(pdata, struct mdss_dsi_ctrl_pdata,

panel_data);

pr_err("peter : bl_level is %d\n",bl_level);

if (ctrl_pdata == NULL)

{

pr_err("%s: ctrl_pdata\n", __func__);

return;

}

if(new_brightness >= MAX_LEVEL)

new_brightness = MAX_LEVEL;

if(new_brightness <= MIN_LEVEL && new_brightness > 0)

new_brightness = MIN_LEVEL;

if(new_brightness == 0)

{

gpio_direction_output(ctrl_pdata->aw9364_en_gpio, 0);

pr_err("bl_level = 0, close bl...\n");

old_brightness = new_brightness;

return;

}

else if(old_brightness == 0)

{

//first pulse must set high more than 20 us

gpio_direction_output(ctrl_pdata->aw9364_en_gpio, 1);

udelay(20);

brightness_level = new_brightness / 15;

total_count = 16 - brightness_level;

pr_err("new_brightness:%d,total_count %d, when old==0\n",new_brightness,total_count);

spin_lock_irqsave(&aw_lock,flags);

for (i = 0; i < total_count; i++)

{

gpio_direction_output(ctrl_pdata->aw9364_en_gpio, 0);

//udelay(2);

gpio_direction_output(ctrl_pdata->aw9364_en_gpio, 1);

//udelay(2);

}

spin_unlock_irqrestore(&aw_lock,flags);

}

else

{

brightness_level = new_brightness / 15;

new_count = 17 - brightness_level;

brightness_level = old_brightness / 15;

old_count = 17 - brightness_level;

if(old_brightness < new_brightness)

{

pr_err("up up up\n");

pr_err("new_count = %d, old_count = %d\n", new_count, old_count);

total_count = new_count - old_count + 16;

//first pulse must set high more than 20 us

//gpio_direction_output(ctrl_pdata->aw9364_en_gpio, 1);

//udelay(20);

spin_lock_irqsave(&aw_lock,flags);

for (i = 0; i < total_count; i++)

{

gpio_direction_output(ctrl_pdata->aw9364_en_gpio, 0);

//udelay(2);

gpio_direction_output(ctrl_pdata->aw9364_en_gpio, 1);

//udelay(2);

}

spin_unlock_irqrestore(&aw_lock,flags);

}

else if(old_brightness > new_brightness)

{

pr_err("down down down\n");

pr_err("new_count = %d, old_count = %d\n", new_count, old_count);

total_count = new_count - old_count;

//first pulse must set high more than 20 us

//gpio_direction_output(ctrl_pdata->aw9364_en_gpio, 1);

//udelay(20);

spin_lock_irqsave(&aw_lock,flags);

for (i = 0; i < total_count; i++)

{

gpio_direction_output(ctrl_pdata->aw9364_en_gpio, 0);

//udelay(2);

gpio_direction_output(ctrl_pdata->aw9364_en_gpio, 1);

//udelay(2);

}

spin_unlock_irqrestore(&aw_lock,flags);

}

else

{

total_count = new_count;

}

pr_err("over: old_brightness = %d, new_brightness = %d, total_count = %d\n", old_brightness, new_brightness, total_count);

old_brightness = new_brightness;

}