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Commit 7c3e4505 authored by Ronak Vijay Raheja's avatar Ronak Vijay Raheja
Browse files

usb: dwc3: Add debugfs entry to toggle compliance pattern 



USB 3.x transmitter electrical compliance testing requires measurements of
different compliance patterns that the PHY is able to output. Changing to
different patterns normally requires triggering an external signal to the
receiver to cause the controller to advance to the next pattern. It is
often useful to be able to toggle the patterns from the DUT itself. This
patch adds a debugfs entry to invoke the dwc3 controller to change
patterns when it is in compliance mode.

Change-Id: If5f7ac793b0c3f0c8ab1775cf7cbe7b48176c325
Signed-off-by: default avatarRonak Vijay Raheja <rraheja@codeaurora.org>
parent 0a38c437

drivers/usb/dwc3/core.h

+1 −0
Original line number Diff line number Diff line
@@ -321,6 +321,7 @@ 


/* Global USB3 PIPE Control Register */

#define DWC3_GUSB3PIPECTL_PHYSOFTRST	BIT(31)

#define DWC3_GUSB3PIPECTL_HSTPRTCMPL	BIT(30)

#define DWC3_GUSB3PIPECTL_U2SSINP3OK	BIT(29)

#define DWC3_GUSB3PIPECTL_DISRXDETINP3	BIT(28)

#define DWC3_GUSB3PIPECTL_UX_EXIT_PX	BIT(27)

drivers/usb/dwc3/debugfs.c

+45 −0
Original line number Diff line number Diff line
@@ -689,6 +689,49 @@ static const struct file_operations dwc3_link_state_fops = { 
	.release		= single_release,

};



static int dwc3_cp_toggle_open(struct inode *inode, struct file *file)

{

	int (*show)(struct seq_file *, void *) = inode->i_private;



	return single_open(file, show, inode->i_private);

}



static ssize_t dwc3_cp_toggle_write(struct file *file,

		const char __user *ubuf, size_t count, loff_t *ppos)

{

	struct seq_file		*s = file->private_data;

	struct dwc3		*dwc = s->private;

	u32			reg;



	if (atomic_read(&dwc->in_lpm)) {

		pr_err("%s: USB device is powered off\n", __func__);

		return 0;

	}



	if (dwc3_gadget_get_link_state(dwc) != DWC3_LINK_STATE_CMPLY) {

		pr_err("%s: USB Device is not in compliance mode\n", __func__);

		return -EINVAL;

	}



	reg = dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(0));

	reg |= DWC3_GUSB3PIPECTL_HSTPRTCMPL;

	dwc3_writel(dwc->regs, DWC3_GUSB3PIPECTL(0), reg);

	msleep(200);

	reg &= ~DWC3_GUSB3PIPECTL_HSTPRTCMPL;

	dwc3_writel(dwc->regs, DWC3_GUSB3PIPECTL(0), reg);

	msleep(200);



	return count;

}



static const struct file_operations dwc3_cp_toggle_fops = {

	.write			= dwc3_cp_toggle_write,

	.open			= dwc3_cp_toggle_open,

	.read			= NULL,

	.llseek			= seq_lseek,

	.release		= single_release,

};



struct dwc3_ep_file_map {

	const char name[25];

	const struct file_operations *const fops;
@@ -1224,6 +1267,8 @@ void dwc3_debugfs_init(struct dwc3 *dwc) 
				    &dwc3_testmode_fops);

		debugfs_create_file("link_state", S_IRUGO | S_IWUSR, root, dwc,

				    &dwc3_link_state_fops);

		debugfs_create_file("cp_toggle", 0200, root, dwc,

				    &dwc3_cp_toggle_fops);

		dwc3_debugfs_create_endpoint_dirs(dwc, root);



		file = debugfs_create_file("int_events", 0644, root, dwc,