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authorKenji Chen <kenji.chen@intel.com>2014-09-12 02:10:53 +0800
committerPatrick Georgi <pgeorgi@google.com>2015-04-02 13:30:43 +0200
commite237f5ac95edb227106a888738771755194c82cd (patch)
tree0027705649a7718122b065d755576f66c4128371 /src/soc/intel/baytrail/pcie.c
parent6ecaf65bffde68d60a53aeeeb62db43c4fa6c5c9 (diff)
downloadcoreboot-e237f5ac95edb227106a888738771755194c82cd.tar.xz
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>
Diffstat (limited to 'src/soc/intel/baytrail/pcie.c')
-rw-r--r--src/soc/intel/baytrail/pcie.c39
1 files changed, 37 insertions, 2 deletions
diff --git a/src/soc/intel/baytrail/pcie.c b/src/soc/intel/baytrail/pcie.c
index 71b90ded47..f80a494a0b 100644
--- a/src/soc/intel/baytrail/pcie.c
+++ b/src/soc/intel/baytrail/pcie.c
@@ -155,6 +155,35 @@ static void check_port_enabled(device_t dev)
}
}
+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 @@ static void check_device_present(device_t dev)
/* 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,