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Onda VX747: fix backlight driver so it doesn't 'flicker' upon init

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21310 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Maurus Cuelenaere 2009-06-16 11:41:48 +00:00
parent d6ad019af3
commit 143f62e8cc
1 changed files with 2 additions and 9 deletions
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11
firmware/target/mips/ingenic_jz47xx/onda_vx747/backlight-onda_vx7X7.c
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@ -35,9 +35,6 @@
static int old_val;
static void set_backlight(int val)
{
if(val == old_val)
return;
/* The pulse repetition frequency should be greater than 100Hz so
the flickering is not perceptible to the human eye but
not greater than about 1kHz. */
@ -62,15 +59,12 @@ static void set_backlight(int val)
static void set_backlight_on(void)
{
set_backlight(old_val);
__tcu_enable_pwm_output(BACKLIGHT_PWM);
__tcu_start_counter(BACKLIGHT_PWM);
}
static void set_backlight_off(void)
{
__tcu_stop_counter(BACKLIGHT_PWM);
__tcu_disable_pwm_output(BACKLIGHT_PWM);
__tcu_stop_counter(BACKLIGHT_PWM);
}
bool _backlight_init(void)
@ -81,7 +75,7 @@ bool _backlight_init(void)
__tcu_stop_counter(BACKLIGHT_PWM);
__tcu_init_pwm_output_low(BACKLIGHT_PWM);
__tcu_set_pwm_output_shutdown_graceful(BACKLIGHT_PWM);
__tcu_enable_pwm_output(BACKLIGHT_PWM);
__tcu_disable_pwm_output(BACKLIGHT_PWM);
__tcu_select_rtcclk(BACKLIGHT_PWM); /* 32.768 kHz */
__tcu_select_clk_div1(BACKLIGHT_PWM);
@ -90,7 +84,6 @@ bool _backlight_init(void)
__tcu_mask_full_match_irq(BACKLIGHT_PWM);
old_val = MAX_BRIGHTNESS_SETTING;
set_backlight_on();
return true;
}