Merge "video: msm: Add backlight scaling for MDSS"
diff --git a/drivers/video/msm/mdss/mdss_fb.c b/drivers/video/msm/mdss/mdss_fb.c
index ca5f890..6cd57ce 100644
--- a/drivers/video/msm/mdss/mdss_fb.c
+++ b/drivers/video/msm/mdss/mdss_fb.c
@@ -101,7 +101,9 @@
if (!bl_lvl && value)
bl_lvl = 1;
+ mutex_lock(&mfd->lock);
mdss_fb_set_backlight(mfd, bl_lvl);
+ mutex_unlock(&mfd->lock);
}
static struct led_classdev backlight_led = {
@@ -209,6 +211,8 @@
mfd->mdp_fb_page_protection = MDP_FB_PAGE_PROTECTION_WRITECOMBINE;
mfd->panel_info.frame_count = 0;
mfd->bl_level = 0;
+ mfd->bl_scale = 1024;
+ mfd->bl_min_lvl = 30;
mfd->fb_imgType = MDP_RGBA_8888;
mfd->pdev = pdev;
@@ -416,9 +420,46 @@
static int unset_bl_level, bl_updated;
static int bl_level_old;
+static int mdss_bl_scale_config(struct msm_fb_data_type *mfd,
+ struct mdp_bl_scale_data *data)
+{
+ int ret = 0;
+ int curr_bl;
+ mutex_lock(&mfd->lock);
+ curr_bl = mfd->bl_level;
+ mfd->bl_scale = data->scale;
+ mfd->bl_min_lvl = data->min_lvl;
+ pr_debug("update scale = %d, min_lvl = %d\n", mfd->bl_scale,
+ mfd->bl_min_lvl);
+
+ /* update current backlight to use new scaling*/
+ mdss_fb_set_backlight(mfd, curr_bl);
+ mutex_unlock(&mfd->lock);
+ return ret;
+}
+
+static void mdss_fb_scale_bl(struct msm_fb_data_type *mfd, u32 *bl_lvl)
+{
+ u32 temp = *bl_lvl;
+ pr_debug("input = %d, scale = %d", temp, mfd->bl_scale);
+ if (temp >= mfd->bl_min_lvl) {
+ /* bl_scale is the numerator of scaling fraction (x/1024)*/
+ temp = (temp * mfd->bl_scale) / 1024;
+
+ /*if less than minimum level, use min level*/
+ if (temp < mfd->bl_min_lvl)
+ temp = mfd->bl_min_lvl;
+ }
+ pr_debug("output = %d", temp);
+
+ (*bl_lvl) = temp;
+}
+
+/* must call this function from within mfd->lock */
void mdss_fb_set_backlight(struct msm_fb_data_type *mfd, u32 bkl_lvl)
{
struct mdss_panel_data *pdata;
+ u32 temp = bkl_lvl;
if (!mfd->panel_power_on || !bl_updated) {
unset_bl_level = bkl_lvl;
@@ -430,15 +471,22 @@
pdata = dev_get_platdata(&mfd->pdev->dev);
if ((pdata) && (pdata->set_backlight)) {
- mutex_lock(&mfd->lock);
- if (bl_level_old == bkl_lvl) {
- mutex_unlock(&mfd->lock);
+ mdss_fb_scale_bl(mfd, &temp);
+ /*
+ * Even though backlight has been scaled, want to show that
+ * backlight has been set to bkl_lvl to those that read from
+ * sysfs node. Thus, need to set bl_level even if it appears
+ * the backlight has already been set to the level it is at,
+ * as well as setting bl_level to bkl_lvl even though the
+ * backlight has been set to the scaled value.
+ */
+ if (bl_level_old == temp) {
+ mfd->bl_level = bkl_lvl;
return;
}
+ pdata->set_backlight(pdata, temp);
mfd->bl_level = bkl_lvl;
- pdata->set_backlight(pdata, mfd->bl_level);
- bl_level_old = mfd->bl_level;
- mutex_unlock(&mfd->lock);
+ bl_level_old = temp;
}
}
@@ -1124,7 +1172,8 @@
return 0;
}
-static int mdss_fb_handle_pp_ioctl(void __user *argp)
+static int mdss_fb_handle_pp_ioctl(struct msm_fb_data_type *mfd,
+ void __user *argp)
{
int ret;
struct msmfb_mdp_pp mdp_pp;
@@ -1179,6 +1228,10 @@
ret = mdss_mdp_gamut_config(&mdp_pp.data.gamut_cfg_data,
©back);
break;
+ case mdp_bl_scale_cfg:
+ ret = mdss_bl_scale_config(mfd, (struct mdp_bl_scale_data *)
+ &mdp_pp.data.bl_scale_data);
+ break;
default:
pr_err("Unsupported request to MDP_PP IOCTL.\n");
ret = -EINVAL;
@@ -1256,7 +1309,7 @@
break;
case MSMFB_MDP_PP:
- ret = mdss_fb_handle_pp_ioctl(argp);
+ ret = mdss_fb_handle_pp_ioctl(mfd, argp);
break;
default:
diff --git a/drivers/video/msm/mdss/mdss_fb.h b/drivers/video/msm/mdss/mdss_fb.h
index 25c39f6..46722b2 100644
--- a/drivers/video/msm/mdss/mdss_fb.h
+++ b/drivers/video/msm/mdss/mdss_fb.h
@@ -83,6 +83,8 @@
unsigned long cursor_buf_iova;
u32 bl_level;
+ u32 bl_scale;
+ u32 bl_min_lvl;
struct mutex lock;
struct platform_device *pdev;