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authorMarek Vasut <marek.vasut@gmail.com>2017-09-12 23:02:08 +0200
committerMarek Vasut <marek.vasut+renesas@gmail.com>2017-09-27 12:12:21 +0200
commit7489d22a3c73b527c21c147f3547e8cc02484e47 (patch)
tree334c5057b7e3c32a0f5aeea386f91ff8fa9a3679 /drivers/usb
parent9241265f29f3670e380a9859a343ddc14873c46f (diff)
usb: xhci: Set number of event segments and entries to 1
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+renesas@gmail.com> Cc: Bin Meng <bmeng.cn@gmail.com>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/host/xhci.h4
1 files 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 */