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[3/6] PCI: Add comments for link speed info arrays

Message ID 1579079063-5668-4-git-send-email-yangyicong@hisilicon.com (mailing list archive)
State Superseded, archived
Delegated to: Bjorn Helgaas
Headers show
Series Improve link speed presentation process | expand

Commit Message

Yicong Yang Jan. 15, 2020, 9:04 a.m. UTC 
Add comments for pcix_bus_speed[] and pcie_link_speed[] arrays.
Indicating the capabilities which the information from.

Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
---
 drivers/pci/probe.c | 8 ++++++++
 1 file changed, 8 insertions(+)
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Patch

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 3c70b87..27e5e1e 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 */