Baytrail: Change PCIe root disable algorithm
Disable Root Port0 only when there is no PCIe device
present on any root port.
BUG=None
TEST=Boot Rambi with PCIe installed/non-installed on RP0 to
confirm the RP0 is correctly enabled/disabled. However, I still
need someone to help check if RP0(no device) is still enabled
if there is device on other RPs since since I have no devices
having slots from RP1/2/3.
Change-Id: Iae552975250ed6f309c423b847621b8994172891
Signed-off-by: Stefan Reinauer <reinauer@chromium.org>
Original-Commit-Id: c5cef0b7c2c146f0d46ed49b75fd2ec8369210ce
Original-Change-Id: I7147569e78b2d1ecea070bc933773cdcae59f9e7
Original-Signed-off-by: Kenji Chen <kenji.chen@intel.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/217791
Original-Tested-by: Ted Kuo <tedkuo@ami.com.tw>
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/9219
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
diff --git a/src/soc/intel/baytrail/pcie.c b/src/soc/intel/baytrail/pcie.c
index 71b90de..f80a494 100644
--- a/src/soc/intel/baytrail/pcie.c
+++ b/src/soc/intel/baytrail/pcie.c
@@ -155,6 +155,35 @@
}
}
+static u8 all_ports_no_dev_present(device_t dev)
+{
+ u8 func;
+ u8 temp = dev->path.pci.devfn;
+ u8 device_not_present = 1;
+ u8 data;
+
+ for (func = 1; func < PCIE_ROOT_PORT_COUNT; func++) {
+ dev->path.pci.devfn &= ~0x7;
+ dev->path.pci.devfn |= func;
+
+ /* is pcie device there */
+ if (pci_read_config32(dev, 0) == 0xFFFFFFFF)
+ continue;
+
+ data = pci_read_config8(dev, XCAP + 3) | (SI >> 24);
+ pci_write_config8(dev, XCAP + 3, data);
+
+ /* is any device present */
+ if ((pci_read_config32(dev, SLCTL_SLSTS) & PDS)) {
+ device_not_present = 0;
+ break;
+ }
+ }
+
+ dev->path.pci.devfn = temp;
+ return device_not_present;
+}
+
static void check_device_present(device_t dev)
{
/* Set slot implemented. */
@@ -163,8 +192,14 @@
/* No device present. */
if (!(pci_read_config32(dev, SLCTL_SLSTS) & PDS)) {
printk(BIOS_DEBUG, "No PCIe device present.\n");
- reg_script_run_on_dev(dev, no_dev_behind_port);
- dev->enabled = 0;
+ if (is_first_port(dev)) {
+ if (all_ports_no_dev_present(dev)) {
+ reg_script_run_on_dev(dev, no_dev_behind_port);
+ dev->enabled = 0;
+ }
+ } else {
+ dev->enabled = 0;
+ }
} else if(!dev->enabled) {
/* Port is disabled, but device present. Disable link. */
pci_write_config32(dev, LCTL,