[PATCH v9 02/14] PCI: Export PCIe link retrain timeout

[Maciej W. Rozycki]

Convert LINK_RETRAIN_TIMEOUT from jiffies to milliseconds, accordingly 
rename to PCIE_LINK_RETRAIN_TIMEOUT_MS, and make available via "pci.h" 
for PCI drivers to use.  Use in `pcie_wait_for_link_delay'.

Signed-off-by: Maciej W. Rozycki <ma...@orcam.me.uk>
---
Changes from v8:

- Convert LINK_RETRAIN_TIMEOUT from jiffies to milliseconds, rename it to
  PCIE_LINK_RETRAIN_TIMEOUT_MS rather than PCIE_LINK_RETRAIN_TIMEOUT, and 
  adjust its use accordingly.

- Also replace hardcoded 1000 in `pcie_wait_for_link_delay'.

- Correct the change heading, s/PCI/PCIe/ for the link reference.

Changes from v7:

- Reorder from 1/7.

No change from v6.

No change from v5.

New change in v5.
---
 drivers/pci/pci.c       |    2 +-
 drivers/pci/pci.h       |    2 ++
 drivers/pci/pcie/aspm.c |    4 +---
 3 files changed, 4 insertions(+), 4 deletions(-)

linux-pcie-link-retrain-timeout.diff
Index: linux-macro/drivers/pci/pci.c
===================================================================
--- linux-macro.orig/drivers/pci/pci.c
+++ linux-macro/drivers/pci/pci.c
@@ -4860,7 +4860,7 @@ static int pci_pm_reset(struct pci_dev *
 static bool pcie_wait_for_link_delay(struct pci_dev *pdev, bool active,
                                     int delay)
 {
-       int timeout = 1000;
+       int timeout = PCIE_LINK_RETRAIN_TIMEOUT_MS;
        bool ret;
        u16 lnk_status;
 
Index: linux-macro/drivers/pci/pci.h
===================================================================
--- linux-macro.orig/drivers/pci/pci.h
+++ linux-macro/drivers/pci/pci.h
@@ -11,6 +11,8 @@
 
 #define PCI_VSEC_ID_INTEL_TBT  0x1234  /* Thunderbolt */
 
+#define PCIE_LINK_RETRAIN_TIMEOUT_MS   1000
+
 extern const unsigned char pcie_link_speed[];
 extern bool pci_early_dump;
 
Index: linux-macro/drivers/pci/pcie/aspm.c
===================================================================
--- linux-macro.orig/drivers/pci/pcie/aspm.c
+++ linux-macro/drivers/pci/pcie/aspm.c
@@ -90,8 +90,6 @@ static const char *policy_str[] = {
        [POLICY_POWER_SUPERSAVE] = "powersupersave"
 };
 
-#define LINK_RETRAIN_TIMEOUT HZ
-
 /*
  * The L1 PM substate capability is only implemented in function 0 in a
  * multi function device.
@@ -213,7 +211,7 @@ static bool pcie_retrain_link(struct pci
        }
 
        /* Wait for link training end. Break out after waiting for timeout */
-       end_jiffies = jiffies + LINK_RETRAIN_TIMEOUT;
+       end_jiffies = jiffies + msecs_to_jiffies(PCIE_LINK_RETRAIN_TIMEOUT_MS);
        do {
                pcie_capability_read_word(parent, PCI_EXP_LNKSTA, &reg16);
                if (!(reg16 & PCI_EXP_LNKSTA_LT))