[PATCH 5.10 10/16] usb: xhci: Set quirk for XHCI_SG_TRB_CACHE_SIZE_QUIRK

From: Greg Kroah-Hartman
Date: Sat Dec 19 2020 - 07:57:36 EST


From: Tejas Joglekar <Tejas.Joglekar@xxxxxxxxxxxx>

commit bac1ec551434697ca3c5bb5d258811ba5446866a upstream.

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@xxxxxxxxxxxx>
Signed-off-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20201208092912.1773650-2-mathias.nyman@xxxxxxxxxxxxxxx
Cc: stable <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/usb/host/xhci-plat.c | 3 +++
drivers/usb/host/xhci.h | 1 +
2 files changed, 4 insertions(+)

--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -333,6 +333,9 @@ static int xhci_plat_probe(struct platfo
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;
--- 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;