This function allow comparing frame index used for
descriptor list which has 64 entries.
Signed-off-by: Gregory Herrero <gregory.herrero@xxxxxxxxx>
---
drivers/usb/dwc2/hcd.h | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/drivers/usb/dwc2/hcd.h b/drivers/usb/dwc2/hcd.h
index f105bad..a19837f 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.
--
2.6.1
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