[PATCH 5.11 133/152] usb: xhci-mtk: fix broken streams issue on 0.96 xHCI

Greg Kroah-Hartman
2021-04-05T09:22:34Z

From: Chunfeng Yun <chunfeng.yun@mediatek.com>

commit 6f978a30c9bb12dab1302d0f06951ee290f5e600 upstream.

The MediaTek 0.96 xHCI controller on some platforms does not
support bulk stream even HCCPARAMS says supporting, due to MaxPSASize
is set a default value 1 by mistake, here use XHCI_BROKEN_STREAMS
quirk to fix it.

Fixes: 94a631d91ad3 ("usb: xhci-mtk: check hcc_params after adding primary hcd")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Link: https://lore.kernel.org/r/1616482975-17841-4-git-send-email-chunfeng.yun@mediatek.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/usb/host/xhci-mtk.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)

--- a/drivers/usb/host/xhci-mtk.c
+++ b/drivers/usb/host/xhci-mtk.c
@@ -397,6 +397,13 @@ static void xhci_mtk_quirks(struct devic
xhci->quirks |= XHCI_SPURIOUS_SUCCESS;
if (mtk->lpm_support)
xhci->quirks |= XHCI_LPM_SUPPORT;
+
+ /*
+ * MTK xHCI 0.96: PSA is 1 by default even if doesn't support stream,
+ * and it's 3 when support it.
+ */
+ if (xhci->hci_version < 0x100 && HCC_MAX_PSA(xhci->hcc_params) == 4)
+ xhci->quirks |= XHCI_BROKEN_STREAMS;
}

/* called during probe() after chip reset completes */
@@ -548,7 +555,8 @@ static int xhci_mtk_probe(struct platfor
if (ret)
goto put_usb3_hcd;

- if (HCC_MAX_PSA(xhci->hcc_params) >= 4)
+ if (HCC_MAX_PSA(xhci->hcc_params) >= 4 &&
+ !(xhci->quirks & XHCI_BROKEN_STREAMS))
xhci->shared_hcd->can_do_streams = 1;

ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);