this adds the possibility to enable/disable the backlight through
the PWMR register, as offered in mx3fb.
Signed-off-by: Eric Bénard <eric@xxxxxxxxxx>
---
arch/arm/plat-mxc/include/mach/imxfb.h | 1 +
drivers/video/imxfb.c | 14 ++++++++++++++
2 files changed, 15 insertions(+), 0 deletions(-)
diff --git a/arch/arm/plat-mxc/include/mach/imxfb.h b/arch/arm/plat-mxc/include/mach/imxfb.h
index 5263506..3c24778 100644
--- a/arch/arm/plat-mxc/include/mach/imxfb.h
+++ b/arch/arm/plat-mxc/include/mach/imxfb.h
@@ -67,6 +67,7 @@ struct imx_fb_platform_data {
u_int pwmr;
u_int lscr1;
u_int dmacr;
+ u_int backlight_level;
u_char * fixed_screen_cpu;
dma_addr_t fixed_screen_dma;
diff --git a/drivers/video/imxfb.c b/drivers/video/imxfb.c
index b4b6dec..9451200 100644
--- a/drivers/video/imxfb.c
+++ b/drivers/video/imxfb.c
@@ -169,6 +169,7 @@ struct imxfb_info {
u_int pwmr;
u_int lscr1;
u_int dmacr;
+ u_int backlight_level;
u_int cmap_inverse:1,
cmap_static:1,
unused:30;
@@ -302,6 +303,14 @@ static int imxfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
return ret;
}
+static void imx_fb_set_brightness(struct imxfb_info *fbi, uint8_t value)
+{
+ pr_debug("%s: value = %d\n", __func__, value);
+ /* This might be board-specific */
+ writel((fbi->pwmr & ~0xFF) | value, fbi->regs + LCDC_PWMR);
+ return;
+}
+
static const struct imx_fb_videomode *imxfb_find_mode(struct imxfb_info *fbi)
{
struct imx_fb_videomode *m;
@@ -470,12 +479,16 @@ static void imxfb_enable_controller(struct imxfb_info *fbi)
fbi->backlight_power(1);
if (fbi->lcd_power)
fbi->lcd_power(1);
+ if (fbi->backlight_level)
+ imx_fb_set_brightness(fbi, fbi->backlight_level);
}
static void imxfb_disable_controller(struct imxfb_info *fbi)
{
pr_debug("Disabling LCD controller\n");
+ if (fbi->backlight_level)
+ imx_fb_set_brightness(fbi, 0);
if (fbi->backlight_power)
fbi->backlight_power(0);
if (fbi->lcd_power)
@@ -660,6 +673,7 @@ static int __init imxfb_init_fbinfo(struct platform_device *pdev)
fbi->pwmr = pdata->pwmr;
fbi->lcd_power = pdata->lcd_power;
fbi->backlight_power = pdata->backlight_power;
+ fbi->backlight_level = pdata->backlight_level;
for (i = 0, m = &pdata->mode[0]; i < pdata->num_modes; i++, m++)
info->fix.smem_len = max_t(size_t, info->fix.smem_len,
--
1.6.3.3
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