[PATCH] shpchp: cleanup bus speed handling
The code related to handling bus speed in SHPCHP driver is
unnecessarily complex. This patch cleans up and simplify that.
Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/pci/hotplug/shpchp_ctrl.c b/drivers/pci/hotplug/shpchp_ctrl.c
index 10f3257..4e63814 100644
--- a/drivers/pci/hotplug/shpchp_ctrl.c
+++ b/drivers/pci/hotplug/shpchp_ctrl.c
@@ -198,7 +198,8 @@
dbg("%s: change to speed %d\n", __FUNCTION__, speed);
if ((rc = p_slot->hpc_ops->set_bus_speed_mode(p_slot, speed))) {
- err("%s: Issue of set bus speed mode command failed\n", __FUNCTION__);
+ err("%s: Issue of set bus speed mode command failed\n",
+ __FUNCTION__);
return WRONG_BUS_FREQUENCY;
}
return rc;
@@ -209,33 +210,26 @@
enum pci_bus_speed msp)
{
int rc = 0;
-
- if (flag != 0) { /* Other slots on the same bus are occupied */
- if ( asp < bsp ) {
- err("%s: speed of bus %x and adapter %x mismatch\n", __FUNCTION__, bsp, asp);
- return WRONG_BUS_FREQUENCY;
+
+ /*
+ * If other slots on the same bus are occupied, we cannot
+ * change the bus speed.
+ */
+ if (flag) {
+ if (asp < bsp) {
+ err("%s: speed of bus %x and adapter %x mismatch\n",
+ __FUNCTION__, bsp, asp);
+ rc = WRONG_BUS_FREQUENCY;
}
+ return rc;
+ }
+
+ if (asp < msp) {
+ if (bsp != asp)
+ rc = change_bus_speed(ctrl, pslot, asp);
} else {
- /* Other slots on the same bus are empty */
- if (msp == bsp) {
- /* if adapter_speed >= bus_speed, do nothing */
- if (asp < bsp) {
- /*
- * Try to lower bus speed to accommodate the adapter if other slots
- * on the same controller are empty
- */
- if ((rc = change_bus_speed(ctrl, pslot, asp)))
- return rc;
- }
- } else {
- if (asp < msp) {
- if ((rc = change_bus_speed(ctrl, pslot, asp)))
- return rc;
- } else {
- if ((rc = change_bus_speed(ctrl, pslot, msp)))
- return rc;
- }
- }
+ if (bsp != msp)
+ rc = change_bus_speed(ctrl, pslot, msp);
}
return rc;
}
@@ -252,8 +246,7 @@
u8 hp_slot;
u8 slots_not_empty = 0;
int rc = 0;
- enum pci_bus_speed adapter_speed, bus_speed, max_bus_speed;
- u8 pi, mode;
+ enum pci_bus_speed asp, bsp, msp;
struct controller *ctrl = p_slot->ctrl;
hp_slot = p_slot->device - ctrl->slot_device_offset;
@@ -285,109 +278,36 @@
}
}
- rc = p_slot->hpc_ops->get_adapter_speed(p_slot, &adapter_speed);
- /* 0 = PCI 33Mhz, 1 = PCI 66 Mhz, 2 = PCI-X 66 PA, 4 = PCI-X 66 ECC, */
- /* 5 = PCI-X 133 PA, 7 = PCI-X 133 ECC, 0xa = PCI-X 133 Mhz 266, */
- /* 0xd = PCI-X 133 Mhz 533 */
- /* This encoding is different from the one used in cur_bus_speed & */
- /* max_bus_speed */
-
- if (rc || adapter_speed == PCI_SPEED_UNKNOWN) {
- err("%s: Can't get adapter speed or bus mode mismatch\n", __FUNCTION__);
+ rc = p_slot->hpc_ops->get_adapter_speed(p_slot, &asp);
+ if (rc) {
+ err("%s: Can't get adapter speed or bus mode mismatch\n",
+ __FUNCTION__);
return WRONG_BUS_FREQUENCY;
}
- rc = p_slot->hpc_ops->get_cur_bus_speed(p_slot, &bus_speed);
- if (rc || bus_speed == PCI_SPEED_UNKNOWN) {
+ rc = p_slot->hpc_ops->get_cur_bus_speed(p_slot, &bsp);
+ if (rc) {
err("%s: Can't get bus operation speed\n", __FUNCTION__);
return WRONG_BUS_FREQUENCY;
}
- rc = p_slot->hpc_ops->get_max_bus_speed(p_slot, &max_bus_speed);
- if (rc || max_bus_speed == PCI_SPEED_UNKNOWN) {
+ rc = p_slot->hpc_ops->get_max_bus_speed(p_slot, &msp);
+ if (rc) {
err("%s: Can't get max bus operation speed\n", __FUNCTION__);
- max_bus_speed = bus_speed;
- }
-
- if ((rc = p_slot->hpc_ops->get_prog_int(p_slot, &pi))) {
- err("%s: Can't get controller programming interface, set it to 1\n", __FUNCTION__);
- pi = 1;
+ msp = bsp;
}
/* Check if there are other slots or devices on the same bus */
if (!list_empty(&ctrl->pci_dev->subordinate->devices))
slots_not_empty = 1;
- dbg("%s: slots_not_empty %d, pi %d\n", __FUNCTION__,
- slots_not_empty, pi);
- dbg("adapter_speed %d, bus_speed %d, max_bus_speed %d\n",
- adapter_speed, bus_speed, max_bus_speed);
+ dbg("%s: slots_not_empty %d, adapter_speed %d, bus_speed %d, "
+ "max_bus_speed %d\n", __FUNCTION__, slots_not_empty, asp,
+ bsp, msp);
- if (pi == 2) {
- dbg("%s: In PI = %d\n", __FUNCTION__, pi);
- if ((rc = p_slot->hpc_ops->get_mode1_ECC_cap(p_slot, &mode))) {
- err("%s: Can't get Mode1_ECC, set mode to 0\n", __FUNCTION__);
- mode = 0;
- }
-
- switch (adapter_speed) {
- case PCI_SPEED_133MHz_PCIX_533:
- case PCI_SPEED_133MHz_PCIX_266:
- if ((bus_speed != adapter_speed) &&
- ((rc = fix_bus_speed(ctrl, p_slot, slots_not_empty, adapter_speed, bus_speed, max_bus_speed))))
- return rc;
- break;
- case PCI_SPEED_133MHz_PCIX_ECC:
- case PCI_SPEED_133MHz_PCIX:
- if (mode) { /* Bus - Mode 1 ECC */
- if ((bus_speed != 0x7) &&
- ((rc = fix_bus_speed(ctrl, p_slot, slots_not_empty, adapter_speed, bus_speed, max_bus_speed))))
- return rc;
- } else {
- if ((bus_speed != 0x4) &&
- ((rc = fix_bus_speed(ctrl, p_slot, slots_not_empty, adapter_speed, bus_speed, max_bus_speed))))
- return rc;
- }
- break;
- case PCI_SPEED_66MHz_PCIX_ECC:
- case PCI_SPEED_66MHz_PCIX:
- if (mode) { /* Bus - Mode 1 ECC */
- if ((bus_speed != 0x5) &&
- ((rc = fix_bus_speed(ctrl, p_slot, slots_not_empty, adapter_speed, bus_speed, max_bus_speed))))
- return rc;
- } else {
- if ((bus_speed != 0x2) &&
- ((rc = fix_bus_speed(ctrl, p_slot, slots_not_empty, adapter_speed, bus_speed, max_bus_speed))))
- return rc;
- }
- break;
- case PCI_SPEED_66MHz:
- if ((bus_speed != 0x1) &&
- ((rc = fix_bus_speed(ctrl, p_slot, slots_not_empty, adapter_speed, bus_speed, max_bus_speed))))
- return rc;
- break;
- case PCI_SPEED_33MHz:
- if (bus_speed > 0x0) {
- if (slots_not_empty == 0) {
- if ((rc = change_bus_speed(ctrl, p_slot, adapter_speed)))
- return rc;
- } else {
- err("%s: speed of bus %x and adapter %x mismatch\n", __FUNCTION__, bus_speed, adapter_speed);
- return WRONG_BUS_FREQUENCY;
- }
- }
- break;
- default:
- err("%s: speed of bus %x and adapter %x mismatch\n", __FUNCTION__, bus_speed, adapter_speed);
- return WRONG_BUS_FREQUENCY;
- }
- } else {
- /* If adpater_speed == bus_speed, nothing to do here */
- dbg("%s: In PI = %d\n", __FUNCTION__, pi);
- if ((adapter_speed != bus_speed) &&
- ((rc = fix_bus_speed(ctrl, p_slot, slots_not_empty, adapter_speed, bus_speed, max_bus_speed))))
- return rc;
- }
+ rc = fix_bus_speed(ctrl, p_slot, slots_not_empty, asp, bsp, msp);
+ if (rc)
+ return rc;
/* turn on board, blink green LED, turn off Amber LED */
if ((rc = p_slot->hpc_ops->slot_enable(p_slot))) {