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| author | Timothy Pearson <tpearson@raptorengineeringinc.com> | 2016-04-04 14:24:23 -0500 |
|---|---|---|
| committer | Martin Roth <martinroth@google.com> | 2016-04-05 22:37:46 +0200 |
| commit | 9ef671769bc5be393f356c85359909a56145a912 (patch) | |
| tree | 892a10d2391b8df86a3841bb07891473b1a1046d /src/southbridge | |
| parent | 1000a5561d0c122e3800896b36767f09f3d96901 (diff) | |
| download | coreboot-9ef671769bc5be393f356c85359909a56145a912.tar.xz | |
sb/amd/sp5100: Add ehci_async_data_cache CMOS option
SP5100 devices are affected by an erratum that can lock up the
EHCI ports under certain conditions. Add an optional CMOS
option to enable a workaround at the expense of performance.
Change-Id: I305d23dfa50f10a3dcb5c731e8923305c8956dde
Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com>
Reviewed-on: https://review.coreboot.org/14241
Tested-by: build bot (Jenkins)
Tested-by: Raptor Engineering Automated Test Stand <noreply@raptorengineeringinc.com>
Reviewed-by: Martin Roth <martinroth@google.com>
Diffstat (limited to 'src/southbridge')
| -rw-r--r-- | src/southbridge/amd/sb700/usb.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/src/southbridge/amd/sb700/usb.c b/src/southbridge/amd/sb700/usb.c index cd7378e7b8..0fdff78f44 100644 --- a/src/southbridge/amd/sb700/usb.c +++ b/src/southbridge/amd/sb700/usb.c @@ -20,6 +20,7 @@ #include <device/pci_ops.h> #include <device/pci_ehci.h> #include <arch/io.h> +#include <option.h> #include "sb700.h" static struct pci_operations lops_pci = { @@ -76,10 +77,16 @@ static void usb_init(struct device *dev) static void usb_init2(struct device *dev) { - u32 dword; + uint32_t dword; void *usb2_bar0; device_t sm_dev; - u8 rev; + uint8_t rev; + uint8_t ehci_async_data_cache; + uint8_t nvram; + + ehci_async_data_cache = 1; + if (get_option(&nvram, "ehci_async_data_cache") == CB_SUCCESS) + ehci_async_data_cache = !!nvram; sm_dev = dev_find_slot(0, PCI_DEVFN(0x14, 0)); rev = get_sb700_revision(sm_dev); @@ -174,6 +181,12 @@ static void usb_init2(struct device *dev) dword |= 1 << 8; dword &= ~(1 << 27); /* 6.23 */ } +#if CONFIG_SOUTHBRIDGE_AMD_SUBTYPE_SP5100 + /* SP5100 Erratum 36 */ + dword &= ~(1 << 26); + if (!ehci_async_data_cache) + dword |= 1 << 26; +#endif pci_write_config32(dev, 0x50, dword); printk(BIOS_DEBUG, "rpr 6.23, final dword=%x\n", dword); } |