The Linux kernel driver sets the number of event segments and entries
to 1 , while the initial import of the xhci code set that values to 3
for reasons unknown. While most controllers are fine with more event
segments with more entries, there are standard-conformant controllers
(ie. Renesas RCar xHCI) which only support 1 event segment.
Set the number of event segments and event entries back to 1 to allow
such controllers to work with U-Boot xHCI stack. Note that the Renesas
controller correctly indicates ERST Max = 1 in HCSPARAMS2[7:4] .
Signed-off-by: Marek Vasut <marek.vasut+rene...@gmail.com>
Cc: Bin Meng <bmeng...@gmail.com>
---
drivers/usb/host/xhci.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index a497d9d830..3377450fca 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1045,9 +1045,9 @@ struct xhci_scratchpad {
* (1K bytes * 8bytes/bit) / (4*32 bits) = 64 segment entries in the table,
* meaning 64 ring segments.
* Initial allocated size of the ERST, in number of entries */
-#define ERST_NUM_SEGS 3
+#define ERST_NUM_SEGS 1
/* Initial number of event segment rings allocated */
-#define ERST_ENTRIES 3
+#define ERST_ENTRIES 1
/* Initial allocated size of the ERST, in number of entries */
#define ERST_SIZE 64
/* Poll every 60 seconds */
--
2.11.0
_______________________________________________
U-Boot mailing list
U-Boot@lists.denx.de
https://lists.denx.de/listinfo/u-boot
