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@xxxxxxxxxxxxxxx>
---
drivers/usb/host/xhci-debugfs.c | 39 ++++++++++++++++++++++++++++++++++++++-
1 file changed, 38 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/host/xhci-debugfs.c b/drivers/usb/host/xhci-debugfs.c
index 76e446a..cadc013 100644
--- a/drivers/usb/host/xhci-debugfs.c
+++ b/drivers/usb/host/xhci-debugfs.c
@@ -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);
}
}
--
2.7.4
--
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