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Commit f3872ee3 authored by Linyu Yuan's avatar Linyu Yuan Committed by Gerrit - the friendly Code Review server
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usb: misc: nb7vpq904m: fix issue when connect USB hub 



when redriver connect to a USB hub, and do adb root operation,
due to redriver rx termination detection issue,
hub will not detct device logical removal.
workaround to temp disable/enable redriver when usb pullup operation.

Change-Id: Ia3b0c99a28dd7d0601e7c5bcc612c4c48447c165
Signed-off-by: default avatarLinyu Yuan <linyyuan@codeaurora.org>
parent e915fc59

drivers/usb/misc/ssusb-redriver-nb7vpq904m.c

+39 −0
Original line number Diff line number Diff line
@@ -98,6 +98,8 @@ struct ssusb_redriver { 
	u8	loss_match[CHAN_MODE_NUM][CHANNEL_NUM];

	u8	flat_gain[CHAN_MODE_NUM][CHANNEL_NUM];



	u8	gen_dev_val;



	struct dentry	*debug_root;

};
@@ -188,6 +190,8 @@ static void ssusb_redriver_gen_dev_set(struct ssusb_redriver *redriver) 
		break;

	}



	redriver->gen_dev_val = val;



	redriver_i2c_reg_set(redriver, GEN_DEV_SET_REG, val);

}
@@ -530,6 +534,41 @@ int redriver_release_usb_lanes(struct device_node *node) 
}

EXPORT_SYMBOL(redriver_release_usb_lanes);



/* NOTE: DO NOT change mode in this funciton */

int redriver_gadget_pullup(struct device_node *node, int is_on)

{

	struct ssusb_redriver *redriver;

	struct i2c_client *client;

	u8 val;



	if (!node)

		return -EINVAL;



	client = of_find_i2c_device_by_node(node);

	if (!client)

		return -EINVAL;



	redriver = i2c_get_clientdata(client);



	/*

	 * when redriver connect to a USB hub, and do adb root operation,

	 * due to redriver rx termination detection issue,

	 * hub will not detct device logical removal.

	 * workaround to temp disable/enable redriver when usb pullup operation.

	 */

	if (redriver->op_mode != OP_MODE_USB)

		return 0;



	val = redriver->gen_dev_val;

	if (!is_on)

		val &= ~CHIP_EN;



	redriver_i2c_reg_set(redriver, GEN_DEV_SET_REG, val);



	return 0;

}

EXPORT_SYMBOL(redriver_gadget_pullup);



static void ssusb_redriver_orientation_gpio_init(

		struct ssusb_redriver *redriver)

{

include/linux/usb/redriver.h

+6 −0
Original line number Diff line number Diff line
@@ -9,6 +9,7 @@ 
#ifdef CONFIG_USB_REDRIVER



int redriver_release_usb_lanes(struct device_node *node);

int redriver_gadget_pullup(struct device_node *node, int is_on);



#else
@@ -17,6 +18,11 @@ static inline int redriver_release_usb_lanes(struct device_node *node) 
	return 0;

}



static inline int redriver_gadget_pullup(struct device_node *node, int is_on)

{

	return 0;

}



#endif



#endif /*__LINUX_USB_REDRIVER_H */