southbridge/amd/sr5650: Add optional delay after link training
Certain devices (such as the LSI SAS 2008 controller) do not
respond to PCI probes immediately after link training. If it
is known that such a device is likely to be installed allow the
mainboard to insert an appropriate delay.
Change-Id: Ibcd9426628cacd6f88e6e3fcbc2b3eb7e3a92081
Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com>
Reviewed-on: http://review.coreboot.org/11991
Reviewed-by: Edward O'Callaghan <edward.ocallaghan@koparo.com>
Tested-by: build bot (Jenkins)
diff --git a/src/southbridge/amd/sr5650/chip.h b/src/southbridge/amd/sr5650/chip.h
index 8a68998..d23c614 100644
--- a/src/southbridge/amd/sr5650/chip.h
+++ b/src/southbridge/amd/sr5650/chip.h
@@ -2,6 +2,7 @@
* This file is part of the coreboot project.
*
* Copyright (C) 2010 Advanced Micro Devices, Inc.
+ * Copyright (C) 2015 Timothy Pearson <tpearson@raptorengineeringinc.com>, Raptor Engineering
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@@ -27,6 +28,9 @@
u8 gpp2_configuration; /* The configuration of General Purpose Port. */
u8 gpp3a_configuration; /* The configuration of General Purpose Port. */
u16 port_enable; /* Which port is enabled? GPP(2,3,4,5,6,7,9,10,11,12,13) */
+ uint32_t pcie_settling_time; /* How long to wait after link training for PCI-e devices to
+ * initialize before probing PCI-e busses (in microseconds).
+ */
};
#endif /* SR5650_CHIP_H */
diff --git a/src/southbridge/amd/sr5650/sr5650.c b/src/southbridge/amd/sr5650/sr5650.c
index 441be66..07d5e20 100644
--- a/src/southbridge/amd/sr5650/sr5650.c
+++ b/src/southbridge/amd/sr5650/sr5650.c
@@ -346,6 +346,7 @@
{
device_t nb_dev = 0, sb_dev = 0;
int dev_ind;
+ struct southbridge_amd_sr5650_config *cfg;
printk(BIOS_INFO, "sr5650_enable: dev=%p, VID_DID=0x%x\n", dev, get_vid_did(dev));
nb_dev = dev_find_slot(0, PCI_DEVFN(0, 0));
@@ -353,6 +354,7 @@
die("sr5650_enable: CAN NOT FIND SR5650 DEVICE, HALT!\n");
/* NOT REACHED */
}
+ cfg = (struct southbridge_amd_sr5650_config *)nb_dev->chip_info;
/* sb_dev (dev 8) is a bridge that links to southbridge. */
sb_dev = dev_find_slot(0, PCI_DEVFN(8, 0));
@@ -433,6 +435,7 @@
/* Lock HWInit Register after the last device was done */
if (dev_ind == 13) {
sr56x0_lock_hwinitreg();
+ udelay(cfg->pcie_settling_time);
}
}