[RFC PATCH 3/4] usb: xhci: Set quirk for XHCI_CONSOLIDATE_TRBS

[Tejas Joglekar <Tejas.Joglekar@synopsys.com>]

This commit enables the quirk when the consolidate_trbs property is set
for the Synopsys xHC. TRB cache errata 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>
---
 drivers/usb/host/xhci-pci.c  | 3 +++
 drivers/usb/host/xhci-plat.c | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 2907fe4d78dd..74f82e67499a 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -260,6 +260,9 @@ static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
 	     pdev->device == 0x9026)
 		xhci->quirks |= XHCI_RESET_PLL_ON_DISCONNECT;
 
+	if (pdev->vendor == PCI_VENDOR_ID_SYNOPSYS)
+		xhci->quirks |= XHCI_CONSOLIDATE_TRBS;
+
 	if (xhci->quirks & XHCI_RESET_ON_RESUME)
 		xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
 				"QUIRK: Resetting on resume");
diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index d90cd5ec09cf..a6f0e7e3d660 100644
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -289,6 +289,9 @@ static int xhci_plat_probe(struct platform_device *pdev)
 		if (device_property_read_bool(tmpdev, "quirk-broken-port-ped"))
 			xhci->quirks |= XHCI_BROKEN_PORT_PED;
 
+		if (device_property_read_bool(tmpdev, "consolidate-trbs"))
+			xhci->quirks |= XHCI_CONSOLIDATE_TRBS;
+
 		device_property_read_u32(tmpdev, "imod-interval-ns",
 					 &xhci->imod_interval);
 	}
-- 
2.11.0