static int msmfb_ioctl(struct fb_info *p, unsigned int cmd, unsigned long arg)
{
    void __user *argp = (void __user *)arg;
        struct fb_cursor cursor;
    int ret;
#if PRINT_BLIT_TIME
    ktime_t t1, t2;
#endif
    struct msmfb_info *msmfb = container_of(p, struct msmfb_info,fb);
    struct msm_panel_data *panel = msmfb->panel;

    switch (cmd) {
    case MSMFB_GRP_DISP:
        mdp->set_grp_disp(mdp, arg);
        break;
    case MSMFB_BLIT:
#if PRINT_BLIT_TIME
        t1 = ktime_get();
#endif
        ret = msmfb_blit(p, argp);
        if (ret)
            return ret;
#if PRINT_BLIT_TIME
        t2 = ktime_get();
        DLOG(BLIT_TIME, "total %lld\n",
               ktime_to_ns(t2) - ktime_to_ns(t1));
#endif
        break;

    case MSMFB_SUSPEND_SW_REFRESHER:
        wait_for_completion_killable(msmfb_refresh_thread);
        break;

    case MSMFB_RESUME_SW_REFRESHER:
        kernel_thread(msmfb_refresh_thread, NULL, CLONE_KERNEL);
        break;

    case MSMFB_CURSOR:
        ret = copy_from_user(&cursor, argp, sizeof(cursor));
        if (ret)
            return ret;
        break;

    case MSMFB_SET_LUT:
        printk("MSMFB_SET_LUT\n");
        break;

    case MSMFB_HISTOGRAM:
        printk("MSMFB_HISTOGRAM\n");
        break;

    case FBIOBLANK:
        if (arg == FB_BLANK_UNBLANK){
            if ( panel->unblank(panel) )
                printk(KERN_INFO "msmfb: panel unblank failed\n");
        }else if (arg == FB_BLANK_POWERDOWN){
            if( panel->blank(panel) )
                printk(KERN_INFO "msmfb: panel blank failed\n");
        }
        break;

    default:
            printk(KERN_INFO "msmfb unknown ioctl: %d\n", cmd);
            return -EINVAL;
    }
    return 0;
}