Commit e93650994a95 ("usb: phy: mxs: add usb charger type detection")
causes the following kernel hang on i.MX28:
[ 2.207973] usbcore: registered new interface driver usb-storage
[ 2.235659] Unable to handle kernel NULL pointer dereference at virtual
address 00000188
[ 2.244195] pgd = (ptrval)
[ 2.246994] [00000188] *pgd=00000000
[ 2.250676] Internal error: Oops: 5 [#1] ARM
[ 2.254979] Modules linked in:
[ 2.258089] CPU: 0 PID: 1 Comm: swapper Not tainted
4.15.0-rc8-next-20180117-00002-g75d5f21 #7
[ 2.266724] Hardware name: Freescale MXS (Device Tree)
[ 2.271921] PC is at regmap_read+0x0/0x5c
[ 2.275977] LR is at mxs_phy_charger_detect+0x34/0x1dc
The USB PHY present on i.MX23/28 does not support charger
detection so do not attempt to run it on these SoCs.
Fixes: e93650994a95 ("usb: phy: mxs: add usb charger type detection")
Signed-off-by: Fabio Estevam <fabio.este...@nxp.com>
---
drivers/usb/phy/phy-mxs-usb.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/phy/phy-mxs-usb.c b/drivers/usb/phy/phy-mxs-usb.c
index da031c4..54a887c 100644
--- a/drivers/usb/phy/phy-mxs-usb.c
+++ b/drivers/usb/phy/phy-mxs-usb.c
@@ -129,6 +129,9 @@
*/
#define MXS_PHY_NEED_IP_FIX BIT(3)
+/* MX23 and MX28 USB PHY does not support charger detecttion */
+#define MXS_PHY_NO_CHARGER BIT(4)
+
/* Minimum and maximum values for device tree entries */
#define MXS_PHY_TX_CAL45_MIN 30
#define MXS_PHY_TX_CAL45_MAX 55
@@ -140,7 +143,8 @@ struct mxs_phy_data {
};
static const struct mxs_phy_data imx23_phy_data = {
- .flags = MXS_PHY_ABNORMAL_IN_SUSPEND | MXS_PHY_SENDING_SOF_TOO_FAST,
+ .flags = MXS_PHY_ABNORMAL_IN_SUSPEND | MXS_PHY_SENDING_SOF_TOO_FAST |
+ MXS_PHY_NO_CHARGER,
};
static const struct mxs_phy_data imx6q_phy_data = {
@@ -602,6 +606,9 @@ static enum usb_charger_type mxs_phy_charger_detect(struct
usb_phy *phy)
void __iomem *base = phy->io_priv;
enum usb_charger_type chgr_type = UNKNOWN_TYPE;
+ if (mxs_phy->data->flags & MXS_PHY_NO_CHARGER)
+ return UNKNOWN_TYPE;
+
if (mxs_charger_data_contact_detect(mxs_phy))
return chgr_type;
--
2.7.4
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