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-rw-r--r--src/soc/nvidia/tegra124/chip.h3
-rw-r--r--src/soc/nvidia/tegra124/display.c30
2 files changed, 19 insertions, 14 deletions
diff --git a/src/soc/nvidia/tegra124/chip.h b/src/soc/nvidia/tegra124/chip.h
index 89a8d977aa..08e96ab809 100644
--- a/src/soc/nvidia/tegra124/chip.h
+++ b/src/soc/nvidia/tegra124/chip.h
@@ -72,6 +72,9 @@ struct soc_nvidia_tegra124_config {
/* Delay before from power on asserting vdd */
int vdd_delay_ms;
+ /* Delay beween pwm and backlight_en_gpio is asserted */
+ int pwm_to_bl_delay_ms;
+
/* Delay before HPD high */
int vdd_to_hpd_delay_ms;
diff --git a/src/soc/nvidia/tegra124/display.c b/src/soc/nvidia/tegra124/display.c
index 87472efd09..898e9b375b 100644
--- a/src/soc/nvidia/tegra124/display.c
+++ b/src/soc/nvidia/tegra124/display.c
@@ -252,20 +252,6 @@ void display_startup(device_t dev)
printk(BIOS_SPEW,"%s: lvds shutdown setting gpio %08x to %d\n",
__func__, config->lvds_shutdown_gpio, 0);
}
- if (config->backlight_en_gpio){
- gpio_output(config->backlight_en_gpio, 1);
- printk(BIOS_SPEW,"%s: backlight enable setting gpio %08x to %d\n",
- __func__, config->backlight_en_gpio, 1);
- }
-
- /* Set up Tegra PWM n (where n is specified in config->pwm) to drive the
- * panel backlight.
- */
- printk(BIOS_SPEW, "%s: enable panel backlight pwm\n", __func__);
- WRITEL(((1 << NV_PWM_CSR_ENABLE_SHIFT) |
- (220 << NV_PWM_CSR_PULSE_WIDTH_SHIFT) | /* 220/256 */
- 0x02e), /* frequency divider */
- &pwm->pwm[config->pwm].csr);
if (framebuffer_size_mb == 0){
framebuffer_size_mb = ALIGN_UP(config->xres * config->yres *
@@ -313,6 +299,22 @@ void display_startup(device_t dev)
update_window(disp_ctrl, config);
+ /* Set up Tegra PWM n (where n is specified in config->pwm) to drive the
+ * panel backlight.
+ */
+ printk(BIOS_SPEW, "%s: enable panel backlight pwm\n", __func__);
+ WRITEL(((1 << NV_PWM_CSR_ENABLE_SHIFT) |
+ (220 << NV_PWM_CSR_PULSE_WIDTH_SHIFT) | /* 220/256 */
+ 0x02e), /* frequency divider */
+ &pwm->pwm[config->pwm].csr);
+
+ udelay(config->pwm_to_bl_delay_ms * 1000);
+ if (config->backlight_en_gpio){
+ gpio_output(config->backlight_en_gpio, 1);
+ printk(BIOS_SPEW,"%s: backlight enable setting gpio %08x to %d\n",
+ __func__, config->backlight_en_gpio, 1);
+ }
+
printk(BIOS_INFO, "%s: display init done.\n", __func__);
/* tell depthcharge ...