Initial commit

target/linux/apm821xx/patches-5.4/802-usb-xhci-force-msi-renesas-xhci.patch

@@ -0,0 +1,53 @@
+From a0dc613140bab907a3d5787a7ae7b0638bf674d0 Mon Sep 17 00:00:00 2001
+From: Christian Lamparter <chunkeey@gmail.com>
+Date: Thu, 23 Jun 2016 20:28:20 +0200
+Subject: [PATCH] usb: xhci: force MSI for uPD720201 and
+ uPD720202
+
+The APM82181 does not support MSI-X. When probed, it will
+produce a noisy warning.
+
+---
+ drivers/usb/host/pci-quirks.c | 362 ++++++++++++++++++++++++++++++++++++++++++
+ 1 file changed, 362 insertions(+)
+
+--- a/drivers/usb/host/xhci-pci.c
++++ b/drivers/usb/host/xhci-pci.c
+@@ -288,6 +288,7 @@ static void xhci_pci_quirks(struct devic
+ 	    pdev->device == 0x0015) {
+ 		xhci->quirks |= XHCI_RESET_ON_RESUME;
+ 		xhci->quirks |= XHCI_ZERO_64B_REGS;
++		xhci->quirks |= XHCI_FORCE_MSI;
+ 	}
+ 	if (pdev->vendor == PCI_VENDOR_ID_VIA)
+ 		xhci->quirks |= XHCI_RESET_ON_RESUME;
+--- a/drivers/usb/host/xhci.c
++++ b/drivers/usb/host/xhci.c
+@@ -427,10 +427,14 @@ static int xhci_try_enable_msi(struct us
+ 		free_irq(hcd->irq, hcd);
+ 	hcd->irq = 0;
+ 
+-	ret = xhci_setup_msix(xhci);
+-	if (ret)
+-		/* fall back to msi*/
++	if (xhci->quirks & XHCI_FORCE_MSI) {
+ 		ret = xhci_setup_msi(xhci);
++	} else {
++		ret = xhci_setup_msix(xhci);
++		if (ret)
++			/* fall back to msi*/
++			ret = xhci_setup_msi(xhci);
++	}
+ 
+ 	if (!ret) {
+ 		hcd->msi_enabled = 1;
+--- a/drivers/usb/host/xhci.h
++++ b/drivers/usb/host/xhci.h
+@@ -1887,6 +1887,7 @@ struct xhci_hcd {
+ 	struct xhci_hub		usb2_rhub;
+ 	struct xhci_hub		usb3_rhub;
+ 	/* support xHCI 1.0 spec USB2 hardware LPM */
++#define XHCI_FORCE_MSI		(1 << 24)
+ 	unsigned		hw_lpm_support:1;
+ 	/* Broken Suspend flag for SNPS Suspend resume issue */
+ 	unsigned		broken_suspend:1;