dsi_display: do not set hbm_mode if in autohbm

If user turns off HBM manually when in autohbm it will turn screen completely off
Unsure of proper fix

Signed-off-by: onettboots <blackcocopet@gmail.com>

Author: pwnrazr

drivers/gpu/drm/msm/dsi-staging/dsi_display.c

@@ -5128,6 +5128,9 @@ static ssize_t sysfs_hbm_write(struct device *dev,
 	if (!display->panel)
 		return -EINVAL;
 
+        if (display->panel->bl_config.bl_level > 2047)
+                return count;
+
 	ret = kstrtoint(buf, 10, &hbm_mode);
 	if (ret) {
 		pr_err("kstrtoint failed. ret=%d\n", ret);