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authorLu Baolu <baolu.lu@linux.intel.com>2016-01-26 17:50:05 +0200
committerSasha Levin <sasha.levin@oracle.com>2016-02-15 15:45:33 -0500
commit69b8883209004c05eac885e53f67f37d6b0f8e11 (patch)
tree0fd869314e7ab65f448b84b74e5c4141a0e87089 /drivers/usb
parent1c0232f6415b1c1c89f71fd3d98e2b497eaf988b (diff)
usb: xhci: handle both SSIC ports in PME stuck quirk
[ Upstream commit fa89537783cb442263fa5a14df6c7693eaf32f11 ] Commit abce329c27b3 ("xhci: Workaround to get D3 working in Intel xHCI") adds a workaround for a limitation of PME storm caused by SSIC port in some Intel SoCs. This commit only handled one SSIC port, while there are actually two SSIC ports in the chips. This patch handles both SSIC ports. Without this fix, users still see PME storm. Cc: stable@vger.kernel.org # v4.2+ Signed-off-by: Zhuang Jin Can <jin.can.zhuang@intel.com> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/host/xhci-pci.c48
1 files changed, 29 insertions, 19 deletions
diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index dd41053afd6f..0c59cf11d88d 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -28,7 +28,9 @@
#include "xhci.h"
#include "xhci-trace.h"
-#define PORT2_SSIC_CONFIG_REG2 0x883c
+#define SSIC_PORT_NUM 2
+#define SSIC_PORT_CFG2 0x880c
+#define SSIC_PORT_CFG2_OFFSET 0x30
#define PROG_DONE (1 << 30)
#define SSIC_PORT_UNUSED (1 << 31)
@@ -317,28 +319,36 @@ static void xhci_pme_quirk(struct usb_hcd *hcd, bool suspend)
struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
u32 val;
void __iomem *reg;
+ int i;
if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
pdev->device == PCI_DEVICE_ID_INTEL_CHERRYVIEW_XHCI) {
- reg = (void __iomem *) xhci->cap_regs + PORT2_SSIC_CONFIG_REG2;
-
- /* Notify SSIC that SSIC profile programming is not done */
- val = readl(reg) & ~PROG_DONE;
- writel(val, reg);
-
- /* Mark SSIC port as unused(suspend) or used(resume) */
- val = readl(reg);
- if (suspend)
- val |= SSIC_PORT_UNUSED;
- else
- val &= ~SSIC_PORT_UNUSED;
- writel(val, reg);
-
- /* Notify SSIC that SSIC profile programming is done */
- val = readl(reg) | PROG_DONE;
- writel(val, reg);
- readl(reg);
+ for (i = 0; i < SSIC_PORT_NUM; i++) {
+ reg = (void __iomem *) xhci->cap_regs +
+ SSIC_PORT_CFG2 +
+ i * SSIC_PORT_CFG2_OFFSET;
+
+ /*
+ * Notify SSIC that SSIC profile programming
+ * is not done.
+ */
+ val = readl(reg) & ~PROG_DONE;
+ writel(val, reg);
+
+ /* Mark SSIC port as unused(suspend) or used(resume) */
+ val = readl(reg);
+ if (suspend)
+ val |= SSIC_PORT_UNUSED;
+ else
+ val &= ~SSIC_PORT_UNUSED;
+ writel(val, reg);
+
+ /* Notify SSIC that SSIC profile programming is done */
+ val = readl(reg) | PROG_DONE;
+ writel(val, reg);
+ readl(reg);
+ }
}
reg = (void __iomem *) xhci->cap_regs + 0x80a4;