The patch below does not apply to the 4.14-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 1f743c8749eacd906dd3ce402b7cd540bb69ad3e Mon Sep 17 00:00:00 2001
From: Chunfeng Yun chunfeng.yun@mediatek.com Date: Wed, 31 Mar 2021 17:05:52 +0800 Subject: [PATCH] usb: xhci-mtk: fix broken streams issue on 0.96 xHCI
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/1617181553-3503-3-git-send-email-chunfeng.yun@medi... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
diff --git a/drivers/usb/host/xhci-mtk.c b/drivers/usb/host/xhci-mtk.c index c1bc40289833..4e3d53cc24f4 100644 --- a/drivers/usb/host/xhci-mtk.c +++ b/drivers/usb/host/xhci-mtk.c @@ -411,6 +411,13 @@ static void xhci_mtk_quirks(struct device *dev, struct xhci_hcd *xhci) 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 */ @@ -572,7 +579,8 @@ static int xhci_mtk_probe(struct platform_device *pdev) 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);