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xhci: debugfs: add debugfs interface to enable compliance mode for a port 

Enable compliance transition for a port by writing "compliance" to the
ports portsc file in debugfs.
port must be "Not-connected" and Link must be in RxDetect state to enable
compliance mode.

Only needed for host that have CTC flag set.
Allows state transitioning to compliance at 1st LFPS timeout.

Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mathias Nyman 2018-05-21 16:40:06 +03:00 committed by Greg Kroah-Hartman
parent 6547502392
commit 87a0380218
1 changed files with 38 additions and 1 deletions
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39
drivers/usb/host/xhci-debugfs.c
View File

@ -8,6 +8,7 @@
*/
#include <linux/slab.h>
#include <linux/uaccess.h>
#include "xhci.h"
#include "xhci-debugfs.h"
@ -351,8 +352,44 @@ static int xhci_port_open(struct inode *inode, struct file *file)
return single_open(file, xhci_portsc_show, inode->i_private);
}
static ssize_t xhci_port_write(struct file *file, const char __user *ubuf,
size_t count, loff_t *ppos)
{
struct seq_file *s = file->private_data;
struct xhci_port *port = s->private;
struct xhci_hcd *xhci = hcd_to_xhci(port->rhub->hcd);
char buf[32];
u32 portsc;
unsigned long flags;
if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
return -EFAULT;
if (!strncmp(buf, "compliance", 10)) {
/* If CTC is clear, compliance is enabled by default */
if (!HCC2_CTC(xhci->hcc_params2))
return count;
spin_lock_irqsave(&xhci->lock, flags);
/* compliance mode can only be enabled on ports in RxDetect */
portsc = readl(port->addr);
if ((portsc & PORT_PLS_MASK) != XDEV_RXDETECT) {
spin_unlock_irqrestore(&xhci->lock, flags);
return -EPERM;
}
portsc = xhci_port_state_to_neutral(portsc);
portsc &= ~PORT_PLS_MASK;
portsc |= PORT_LINK_STROBE | XDEV_COMP_MODE;
writel(portsc, port->addr);
spin_unlock_irqrestore(&xhci->lock, flags);
} else {
return -EINVAL;
}
return count;
}
static const struct file_operations port_fops = {
.open = xhci_port_open,
.write = xhci_port_write,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
@ -491,7 +528,7 @@ static void xhci_debugfs_create_ports(struct xhci_hcd *xhci,
num_ports + 1);
dir = debugfs_create_dir(port_name, parent);
port = &xhci->hw_ports[num_ports];
debugfs_create_file("portsc", 0444, dir, port, &port_fops);
debugfs_create_file("portsc", 0644, dir, port, &port_fops);
}
}