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authorGregory Herrero <gregory.herrero@intel.com>2015-11-05 09:41:42 +0100
committerFelipe Balbi <balbi@ti.com>2015-12-15 09:12:41 -0600
commitb9392d9920fdce50abbe4af758cd1a24b922c81c (patch)
treefc4157601ccc25c186d192e0d040862860ea9bbc /drivers/usb/dwc2/hcd.h
parent2b046bc5aaefd4aba7195e6a73afe14f7f786692 (diff)
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usb: dwc2: host: add function to compare frame index
This function allow comparing frame index used for descriptor list which has 64 entries. Acked-by: John Youn <johnyoun@synopsys.com> Signed-off-by: Gregory Herrero <gregory.herrero@intel.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
Diffstat (limited to 'drivers/usb/dwc2/hcd.h')
-rw-r--r--drivers/usb/dwc2/hcd.h13
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/usb/dwc2/hcd.h b/drivers/usb/dwc2/hcd.h
index f105bada2fd1..a19837f655c9 100644
--- a/drivers/usb/dwc2/hcd.h
+++ b/drivers/usb/dwc2/hcd.h
@@ -535,6 +535,19 @@ static inline bool dbg_perio(void) { return false; }
#define dwc2_max_packet(wmaxpacketsize) ((wmaxpacketsize) & 0x07ff)
/*
+ * Returns true if frame1 index is greater than frame2 index. The comparison
+ * is done modulo FRLISTEN_64_SIZE. This accounts for the rollover of the
+ * frame number when the max index frame number is reached.
+ */
+static inline bool dwc2_frame_idx_num_gt(u16 fr_idx1, u16 fr_idx2)
+{
+ u16 diff = fr_idx1 - fr_idx2;
+ u16 sign = diff & (FRLISTEN_64_SIZE >> 1);
+
+ return diff && !sign;
+}
+
+/*
* Returns true if frame1 is less than or equal to frame2. The comparison is
* done modulo HFNUM_MAX_FRNUM. This accounts for the rollover of the
* frame number when the max frame number is reached.