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-rw-r--r--src/soc/nvidia/tegra124/display.c16
1 files changed, 11 insertions, 5 deletions
diff --git a/src/soc/nvidia/tegra124/display.c b/src/soc/nvidia/tegra124/display.c
index 2fbec50cf8..8c4e8232dd 100644
--- a/src/soc/nvidia/tegra124/display.c
+++ b/src/soc/nvidia/tegra124/display.c
@@ -33,6 +33,7 @@
#include <edid.h>
#include <soc/clock.h>
#include <soc/nvidia/tegra/dc.h>
+#include <soc/nvidia/tegra/pwm.h>
#include <soc/nvidia/tegra124/sdram.h>
#include "chip.h"
#include <soc/display.h>
@@ -240,6 +241,7 @@ void display_startup(device_t dev)
int i;
struct soc_nvidia_tegra124_config *config = dev->chip_info;
struct display_controller *dc = (void *)config->display_controller;
+ struct pwm_controller *pwm = (void *)TEGRA_PWM_BASE;
struct disp_ctl_win window;
/* should probably just make it all MiB ... in future */
@@ -270,11 +272,15 @@ void display_startup(device_t dev)
__func__, config->backlight_en_gpio, 1);
}
- if (config->pwm){
- gpio_output(config->pwm, 1);
- printk(BIOS_SPEW,"%s: pwm setting gpio %08x to %d\n",
- __func__, config->pwm, 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);
+
printk(BIOS_SPEW,
"%s: xres %d yres %d framebuffer_bits_per_pixel %d\n",
__func__,