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usb: dwc3: Check USB LPM status before accessing registers

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USB controller registers can be accessed when USB session
is not active or USB is in low power mode. This results
in unclocked register access. Prevent this by checking
the USB LPM status before accessing the registers.

Change-Id: I5a31bda1d88ac65b28afc2b545a44b4574b8548a
Signed-off-by: Elson Roy Serrao <eserrao@codeaurora.org>
Signed-off-by: Jack Pham <jackp@codeaurora.org>
This commit is contained in:
Elson Roy Serrao 2019-08-20 13:52:24 -07:00 • committed by Jack Pham
commit 04add1acdf
1 changed files with 27 additions and 1 deletions
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28
drivers/usb/dwc3/debugfs.c
View file

@ -393,6 +393,32 @@ static const struct file_operations dwc3_lsp_fops = {
.release = single_release,
};
static int dwc3_regdump_show(struct seq_file *s, void *unused)
{
struct dwc3 *dwc = s->private;
if (atomic_read(&dwc->in_lpm)) {
seq_puts(s, "USB device is powered off\n");
return 0;
}
debugfs_print_regs32(s, dwc->regset->regs, dwc->regset->nregs,
dwc->regset->base, "");
return 0;
}
static int dwc3_regdump_open(struct inode *inode, struct file *file)
{
return single_open(file, dwc3_regdump_show, inode->i_private);
}
static const struct file_operations dwc3_regdump_fops = {
.open = dwc3_regdump_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int dwc3_mode_show(struct seq_file *s, void *unused)
{
struct dwc3 *dwc = s->private;
@ -1168,7 +1194,7 @@ void dwc3_debugfs_init(struct dwc3 *dwc)
dwc->root = root;
debugfs_create_regset32("regdump", S_IRUGO, root, dwc->regset);
debugfs_create_file("regdump", 0444, root, dwc, &dwc3_regdump_fops);
debugfs_create_file("lsp_dump", S_IRUGO | S_IWUSR, root, dwc,
&dwc3_lsp_fops);