Add comments for pcix_bus_speed[] and pcie_link_speed[] arrays.
Indicating the capabilities which the information from.
Signed-off-by: Yicong Yang <yangyicong@xxxxxxxxxxxxx>
---
drivers/pci/probe.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 6ce47d8..b97f969 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -640,6 +640,10 @@ void pci_free_host_bridge(struct pci_host_bridge *bridge)
}
EXPORT_SYMBOL(pci_free_host_bridge);
+/*
+ * these indices represent secondary bus mode and
+ * frequency from PCI_X_SSTATUS_FREQ
+ */
static const unsigned char pcix_bus_speed[] = {
PCI_SPEED_UNKNOWN, /* 0 */
PCI_SPEED_66MHz_PCIX, /* 1 */
@@ -659,6 +663,10 @@ static const unsigned char pcix_bus_speed[] = {
PCI_SPEED_133MHz_PCIX_533 /* F */
};
+/*
+ * these indices represent PCIe link speed from
+ * PCI_EXP_LNKCAP, PCI_EXP_LNKSTA, PCI_EXP_LNKCAP2
+ */
const unsigned char pcie_link_speed[] = {
PCI_SPEED_UNKNOWN, /* 0 */
PCIE_SPEED_2_5GT, /* 1 */
--
2.8.1
