linux-kernel - [PATCH] usb: pci-quirks: do not access OHCI

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Date:	Tue, 27 May 2014 08:56:42 +0400
From:	Nikita Yushchenko <nyushchenko@....rtsoft.ru>
To:	Mathias Nyman <mathias.nyman@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	lugovskoy@....rtsoft.ru,
	Nikita Yushchenko <nyushchenko@....rtsoft.ru>
Subject: [PATCH] usb: pci-quirks: do not access OHCI_FMINTERVAL register on ULI hw

This access causes hang on Freescale P2020DS board (that has OHCI
provided by ULI 1533 chip).

Since preserving OHCI_FMINTERVAL was originally done only for NVIDIA
hardware and only later (in c6187597) was turned unconditional, and
c6187597 commit message again mentions only NVIDIA, I think it should be
safe to disable preserving OHCI_FMINTERVAL if device vendor is ULI.

Signed-off-by: Nikita Yushchenko <nyushchenko@....rtsoft.ru>
---
 drivers/usb/host/pci-quirks.c |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/host/pci-quirks.c b/drivers/usb/host/pci-quirks.c
index 00661d3..5acbd5b 100644
--- a/drivers/usb/host/pci-quirks.c
+++ b/drivers/usb/host/pci-quirks.c
@@ -571,7 +571,7 @@ static void quirk_usb_handoff_ohci(struct pci_dev *pdev)
 {
 	void __iomem *base;
 	u32 control;
-	u32 fminterval;
+	u32 uninitialized_var(fminterval);
 	int cnt;
 
 	if (!mmio_resource_enabled(pdev, 0))
@@ -619,7 +619,8 @@ static void quirk_usb_handoff_ohci(struct pci_dev *pdev)
 	}
 
 	/* software reset of the controller, preserving HcFmInterval */
-	fminterval = readl(base + OHCI_FMINTERVAL);
+	if (pdev->vendor != PCI_VENDOR_ID_AL)
+		fminterval = readl(base + OHCI_FMINTERVAL);
 	writel(OHCI_HCR, base + OHCI_CMDSTATUS);
 
 	/* reset requires max 10 us delay */
@@ -628,7 +629,8 @@ static void quirk_usb_handoff_ohci(struct pci_dev *pdev)
 			break;
 		udelay(1);
 	}
-	writel(fminterval, base + OHCI_FMINTERVAL);
+	if (pdev->vendor != PCI_VENDOR_ID_AL)
+		writel(fminterval, base + OHCI_FMINTERVAL);
 
 	/* Now the controller is safely in SUSPEND and nothing can wake it up */
 	iounmap(base);
-- 
1.7.10.4

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