summaryrefslogtreecommitdiff
path: root/drivers/usb
diff options
context:
space:
mode:
authorMathias Nyman <mathias.nyman@linux.intel.com>2018-03-20 15:57:08 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-03-22 15:40:10 +0300
commitd0a0fa9d74b9ba3b24b43fd50c318c27dc34c06f (patch)
tree477447040c6549af9579f9f545064a34395ac049 /drivers/usb
parent2000016c94b4f724cb5851486b9f9a94e8da32fc (diff)
downloadlinux-d0a0fa9d74b9ba3b24b43fd50c318c27dc34c06f.tar.xz
xhci: Add option to get next extended capability in list by passing id = 0
Modify xhci_find_next_ext_cap(base, offset, id) to return the next capability offset if 0 is passed for id. Otherwise it will behave as previously and return the offset of the next capability with matching id capability id 0 is not used by xHCI (reserved) This is useful when we want to loop through all capabilities. Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/host/xhci-ext-caps.h5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/usb/host/xhci-ext-caps.h b/drivers/usb/host/xhci-ext-caps.h
index bf7316e130d3..631e7cc62604 100644
--- a/drivers/usb/host/xhci-ext-caps.h
+++ b/drivers/usb/host/xhci-ext-caps.h
@@ -84,7 +84,8 @@
* @base PCI MMIO registers base address.
* @start address at which to start looking, (0 or HCC_PARAMS to start at
* beginning of list)
- * @id Extended capability ID to search for.
+ * @id Extended capability ID to search for, or 0 for the next
+ * capability
*
* Returns the offset of the next matching extended capability structure.
* Some capabilities can occur several times, e.g., the XHCI_EXT_CAPS_PROTOCOL,
@@ -110,7 +111,7 @@ static inline int xhci_find_next_ext_cap(void __iomem *base, u32 start, int id)
val = readl(base + offset);
if (val == ~0)
return 0;
- if (XHCI_EXT_CAPS_ID(val) == id && offset != start)
+ if (offset != start && (id == 0 || XHCI_EXT_CAPS_ID(val) == id))
return offset;
next = XHCI_EXT_CAPS_NEXT(val);