1 files changed, 79 insertions, 0 deletions

diff --git a/drivers/usb/host/ehci-sched.c b/drivers/usb/host/ehci-sched.c
index d9f78eb26572..aa46f57f9ec8 100644
--- a/drivers/usb/host/ehci-sched.c
+++ b/drivers/usb/host/ehci-sched.c
@@ -1590,6 +1590,63 @@ itd_link (struct ehci_hcd *ehci, unsigned frame, struct ehci_itd *itd)
         *hw_p = cpu_to_hc32(ehci, itd->itd_dma | Q_TYPE_ITD);
 }
 
+#define AB_REG_BAR_LOW 0xe0
+#define AB_REG_BAR_HIGH 0xe1
+#define AB_INDX(addr) ((addr) + 0x00)
+#define AB_DATA(addr) ((addr) + 0x04)
+#define NB_PCIE_INDX_ADDR 0xe0
+#define NB_PCIE_INDX_DATA 0xe4
+#define NB_PIF0_PWRDOWN_0 0x01100012
+#define NB_PIF0_PWRDOWN_1 0x01100013
+
+static void ehci_quirk_amd_L1(struct ehci_hcd *ehci, int disable)
+{
+        u32 addr, addr_low, addr_high, val;
+
+        outb_p(AB_REG_BAR_LOW, 0xcd6);
+        addr_low = inb_p(0xcd7);
+        outb_p(AB_REG_BAR_HIGH, 0xcd6);
+        addr_high = inb_p(0xcd7);
+        addr = addr_high << 8 | addr_low;
+        outl_p(0x30, AB_INDX(addr));
+        outl_p(0x40, AB_DATA(addr));
+        outl_p(0x34, AB_INDX(addr));
+        val = inl_p(AB_DATA(addr));
+
+        if (disable) {
+                val &= ~0x8;
+                val |= (1 << 4) | (1 << 9);
+        } else {
+                val |= 0x8;
+                val &= ~((1 << 4) | (1 << 9));
+        }
+        outl_p(val, AB_DATA(addr));
+
+        if (amd_nb_dev) {
+                addr = NB_PIF0_PWRDOWN_0;
+                pci_write_config_dword(amd_nb_dev, NB_PCIE_INDX_ADDR, addr);
+                pci_read_config_dword(amd_nb_dev, NB_PCIE_INDX_DATA, &val);
+                if (disable)
+                        val &= ~(0x3f << 7);
+                else
+                        val |= 0x3f << 7;
+
+                pci_write_config_dword(amd_nb_dev, NB_PCIE_INDX_DATA, val);
+
+                addr = NB_PIF0_PWRDOWN_1;
+                pci_write_config_dword(amd_nb_dev, NB_PCIE_INDX_ADDR, addr);
+                pci_read_config_dword(amd_nb_dev, NB_PCIE_INDX_DATA, &val);
+                if (disable)
+                        val &= ~(0x3f << 7);
+                else
+                        val |= 0x3f << 7;
+
+                pci_write_config_dword(amd_nb_dev, NB_PCIE_INDX_DATA, val);
+        }
+
+        return;
+}
+
 /* fit urb's itds into the selected schedule slot; activate as needed */
 static int
 itd_link_urb (
@@ -1616,6 +1673,12 @@ itd_link_urb (
                         urb->interval,
                         next_uframe >> 3, next_uframe & 0x7);
         }
+
+        if (ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs == 0) {
+                if (ehci->amd_l1_fix == 1)
+                        ehci_quirk_amd_L1(ehci, 1);
+        }
+
         ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs++;
 
         /* fill iTDs uframe by uframe */
@@ -1740,6 +1803,11 @@ itd_complete (
         (void) disable_periodic(ehci);
         ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs--;
 
+        if (ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs == 0) {
+                if (ehci->amd_l1_fix == 1)
+                        ehci_quirk_amd_L1(ehci, 0);
+        }
+
         if (unlikely(list_is_singular(&stream->td_list))) {
                 ehci_to_hcd(ehci)->self.bandwidth_allocated
                                 -= stream->bandwidth;
@@ -2025,6 +2093,12 @@ sitd_link_urb (
                         (next_uframe >> 3) & (ehci->periodic_size - 1),
                         stream->interval, hc32_to_cpu(ehci, stream->splits));
         }
+
+        if (ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs == 0) {
+                if (ehci->amd_l1_fix == 1)
+                        ehci_quirk_amd_L1(ehci, 1);
+        }
+
         ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs++;
 
         /* fill sITDs frame by frame */
@@ -2125,6 +2199,11 @@ sitd_complete (
         (void) disable_periodic(ehci);
         ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs--;
 
+        if (ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs == 0) {
+                if (ehci->amd_l1_fix == 1)
+                        ehci_quirk_amd_L1(ehci, 0);
+        }
+
         if (list_is_singular(&stream->td_list)) {
                 ehci_to_hcd(ehci)->self.bandwidth_allocated
                                 -= stream->bandwidth;