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Unknown charger detected after connecting to PC Host occasionally

Li Chen71282
Intellectual 380 points
Other Parts Discussed in Thread: TWL6032

Our software is based on 4AJ2.1 release and we are using omap4430 and PMIC twl6032. When I connect our device to PC host, most time it report PC type in omap4_charger_detect function at /arch/arm/mach-omap2/omap_phy_internal.c.

However, sometimes it reports "Unknown charger", the bit 23:21 in CONTROL_USB2PHYCORE indicate 0(Wait state). And I need to reconnect USB cable to let PC host recognize the device. First, I don't know how it ends up in Wait state. Second, is there any way to reset the USB port from OMAP when it faces such condition? Thanks!

  • 0
    TI__Genius 10965 points

    Hi Li Chen,

    First you can thinker with the jiffies value in: omap4_charger_detect(void)

    timeout = jiffies + msecs_to_jiffies(2000);

    and also see if this peace of code is implemented after it:

    1. <       omap4_ctrl_pad_writel(omap4_ctrl_pad_readl(CONTROL_USB2PHYCORE) & ~USB2PHY_DISCHGDET, CONTROL_USB2PHYCORE);
    2. <       do {
    3. <               msleep(10);
    4. <               usb2phycore = omap4_ctrl_pad_readl(CONTROL_USB2PHYCORE);
    5. <               chargertype = ((usb2phycore >> 21) & 0x7);
    6. <               if (chargertype)
    7. <               {
    8. <                       // Give things time to settle.
    9. <                       msleep(5);
    10. <                       usb2phycore = omap4_ctrl_pad_readl(CONTROL_USB2PHYCORE);
    11. <                       chargertype = ((usb2phycore >> 21) & 0x7);
    12. <                       break;
    13. <               }
    14. <       } while (!time_after(jiffies, timeout));

    Regards,

    Boyko