This is a note to let you know that I've just added the patch titled

usb: xhci: Set quirk for XHCI_SG_TRB_CACHE_SIZE_QUIRK

to my usb git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git in the usb-testing branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will be merged to the usb-next branch sometime soon, after it passes testing, and the merge window is open.

If you have any questions about this process, please let me know.

From bac1ec551434697ca3c5bb5d258811ba5446866a Mon Sep 17 00:00:00 2001

From: Tejas Joglekar Tejas.Joglekar@synopsys.com Date: Tue, 8 Dec 2020 11:29:08 +0200 Subject: usb: xhci: Set quirk for XHCI_SG_TRB_CACHE_SIZE_QUIRK

This commit uses the private data passed by parent device to set the quirk for Synopsys xHC. This patch fixes the SNPS xHC hang issue when the data is scattered across small buffers which does not make atleast MPS size for given TRB cache size of SNPS xHC.

Signed-off-by: Tejas Joglekar joglekar@synopsys.com Signed-off-by: Mathias Nyman mathias.nyman@linux.intel.com Link: https://lore.kernel.org/r/20201208092912.1773650-2-mathias.nyman@linux.intel... Cc: stable stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/host/xhci-plat.c | 3 +++ drivers/usb/host/xhci.h | 1 + 2 files changed, 4 insertions(+)

diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c index aa2d35f98200..4d34f6005381 100644 --- a/drivers/usb/host/xhci-plat.c +++ b/drivers/usb/host/xhci-plat.c @@ -333,6 +333,9 @@ static int xhci_plat_probe(struct platform_device *pdev) if (priv && (priv->quirks & XHCI_SKIP_PHY_INIT)) hcd->skip_phy_initialization = 1;

+ if (priv && (priv->quirks & XHCI_SG_TRB_CACHE_SIZE_QUIRK)) + xhci->quirks |= XHCI_SG_TRB_CACHE_SIZE_QUIRK; + ret = usb_add_hcd(hcd, irq, IRQF_SHARED); if (ret) goto disable_usb_phy; diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h index ebb359ebb261..d90c0d5df3b3 100644 --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -1878,6 +1878,7 @@ struct xhci_hcd { #define XHCI_RENESAS_FW_QUIRK BIT_ULL(36) #define XHCI_SKIP_PHY_INIT BIT_ULL(37) #define XHCI_DISABLE_SPARSE BIT_ULL(38) +#define XHCI_SG_TRB_CACHE_SIZE_QUIRK BIT_ULL(39)

unsigned int num_active_eps; unsigned int limit_active_eps;