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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 int old_val;
static void set_backlight(int val) static void set_backlight(int val)
{ {
if(val == old_val)
return;
/* The pulse repetition frequency should be greater than 100Hz so /* The pulse repetition frequency should be greater than 100Hz so
the flickering is not perceptible to the human eye but the flickering is not perceptible to the human eye but
not greater than about 1kHz. */ not greater than about 1kHz. */
@ -62,15 +59,12 @@ static void set_backlight(int val)
static void set_backlight_on(void) static void set_backlight_on(void)
{ {
set_backlight(old_val); set_backlight(old_val);
__tcu_enable_pwm_output(BACKLIGHT_PWM);
__tcu_start_counter(BACKLIGHT_PWM);
} }
static void set_backlight_off(void) static void set_backlight_off(void)
{ {
__tcu_stop_counter(BACKLIGHT_PWM);
__tcu_disable_pwm_output(BACKLIGHT_PWM); __tcu_disable_pwm_output(BACKLIGHT_PWM);
__tcu_stop_counter(BACKLIGHT_PWM);
} }
bool _backlight_init(void) bool _backlight_init(void)
@ -81,7 +75,7 @@ bool _backlight_init(void)
__tcu_stop_counter(BACKLIGHT_PWM); __tcu_stop_counter(BACKLIGHT_PWM);
__tcu_init_pwm_output_low(BACKLIGHT_PWM); __tcu_init_pwm_output_low(BACKLIGHT_PWM);
__tcu_set_pwm_output_shutdown_graceful(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_rtcclk(BACKLIGHT_PWM); /* 32.768 kHz */
__tcu_select_clk_div1(BACKLIGHT_PWM); __tcu_select_clk_div1(BACKLIGHT_PWM);
@ -90,7 +84,6 @@ bool _backlight_init(void)
__tcu_mask_full_match_irq(BACKLIGHT_PWM); __tcu_mask_full_match_irq(BACKLIGHT_PWM);
old_val = MAX_BRIGHTNESS_SETTING; old_val = MAX_BRIGHTNESS_SETTING;
set_backlight_on();
return true; return true;
} }