Changeset bdd8842c in mainline for uspace/drv/bus/usb/xhci/transfers.c

Timestamp:

2018-01-08T19:26:41Z (6 years ago)

Author:

Ondřej Hlavatý <aearsis@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

17c5e62

Parents:

1102eca

Message:

xhci: revised handling of max_burst, mult and max_streams

File:

• uspace/drv/bus/usb/xhci/transfers.c (modified) (1 diff)

uspace/drv/bus/usb/xhci/transfers.c

@@ -263 +263 @@
         // see 4.14.1 and 4.11.2.3 for the explanation, how to calculate those
         size_t tdpc = len / 1024 + ((len % 1024) ? 1 : 0);
-        size_t tbc = tdpc / (ep->max_burst + 1);
-        if (!tdpc % (ep->max_burst + 1)) --tbc;
-        size_t bsp = tdpc % (ep->max_burst + 1);
-        size_t tlbpc = (bsp ? bsp - 1 : ep->max_burst);
+        size_t tbc = tdpc / ep->max_burst;
+        if (!tdpc % ep->max_burst) --tbc;
+        size_t bsp = tdpc % ep->max_burst;
+        size_t tlbpc = (bsp ? bsp : ep->max_burst) - 1;
 
         TRB_CTRL_SET_TBC(*trb, tbc);