diff options
| author | Marek Vasut <marek.vasut@gmail.com> | 2017-09-12 23:02:08 +0200 |
|---|---|---|
| committer | Marek Vasut <marek.vasut+renesas@gmail.com> | 2017-09-27 12:12:21 +0200 |
| commit | 7489d22a3c73b527c21c147f3547e8cc02484e47 (patch) | |
| tree | 334c5057b7e3c32a0f5aeea386f91ff8fa9a3679 | |
| parent | 9241265f29f3670e380a9859a343ddc14873c46f (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>
| -rw-r--r-- | drivers/usb/host/xhci.h | 4 |
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 */ |