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path: root/drivers/pci/pci.c
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Diffstat (limited to 'drivers/pci/pci.c')
-rw-r--r--drivers/pci/pci.c40
1 files changed, 25 insertions, 15 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index f89db3af0..25e0327d4 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -25,7 +25,6 @@
#include <linux/device.h>
#include <linux/pm_runtime.h>
#include <linux/pci_hotplug.h>
-#include <asm-generic/pci-bridge.h>
#include <asm/setup.h>
#include <linux/aer.h>
#include "pci.h"
@@ -3386,18 +3385,6 @@ bool pci_check_and_unmask_intx(struct pci_dev *dev)
}
EXPORT_SYMBOL_GPL(pci_check_and_unmask_intx);
-int pci_set_dma_max_seg_size(struct pci_dev *dev, unsigned int size)
-{
- return dma_set_max_seg_size(&dev->dev, size);
-}
-EXPORT_SYMBOL(pci_set_dma_max_seg_size);
-
-int pci_set_dma_seg_boundary(struct pci_dev *dev, unsigned long mask)
-{
- return dma_set_seg_boundary(&dev->dev, mask);
-}
-EXPORT_SYMBOL(pci_set_dma_seg_boundary);
-
/**
* pci_wait_for_pending_transaction - waits for pending transaction
* @dev: the PCI device to operate on
@@ -3414,6 +3401,29 @@ int pci_wait_for_pending_transaction(struct pci_dev *dev)
}
EXPORT_SYMBOL(pci_wait_for_pending_transaction);
+/*
+ * We should only need to wait 100ms after FLR, but some devices take longer.
+ * Wait for up to 1000ms for config space to return something other than -1.
+ * Intel IGD requires this when an LCD panel is attached. We read the 2nd
+ * dword because VFs don't implement the 1st dword.
+ */
+static void pci_flr_wait(struct pci_dev *dev)
+{
+ int i = 0;
+ u32 id;
+
+ do {
+ msleep(100);
+ pci_read_config_dword(dev, PCI_COMMAND, &id);
+ } while (i++ < 10 && id == ~0);
+
+ if (id == ~0)
+ dev_warn(&dev->dev, "Failed to return from FLR\n");
+ else if (i > 1)
+ dev_info(&dev->dev, "Required additional %dms to return from FLR\n",
+ (i - 1) * 100);
+}
+
static int pcie_flr(struct pci_dev *dev, int probe)
{
u32 cap;
@@ -3429,7 +3439,7 @@ static int pcie_flr(struct pci_dev *dev, int probe)
dev_err(&dev->dev, "timed out waiting for pending transaction; performing function level reset anyway\n");
pcie_capability_set_word(dev, PCI_EXP_DEVCTL, PCI_EXP_DEVCTL_BCR_FLR);
- msleep(100);
+ pci_flr_wait(dev);
return 0;
}
@@ -3459,7 +3469,7 @@ static int pci_af_flr(struct pci_dev *dev, int probe)
dev_err(&dev->dev, "timed out waiting for pending transaction; performing AF function level reset anyway\n");
pci_write_config_byte(dev, pos + PCI_AF_CTRL, PCI_AF_CTRL_FLR);
- msleep(100);
+ pci_flr_wait(dev);
return 0;
}