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authorKrystian Hebel <krystian.hebel@3mdeb.com>2018-12-21 18:19:14 +0100
committerFelix Held <felix-coreboot@felixheld.de>2018-12-28 22:39:40 +0000
commitfba03208428fd11acc69e0b3b00bf358cc83f7de (patch)
treeade76a3921133b3283f1c4be7c71c0ca3d268788 /src/mainboard
parent69b6c56909653f5fd438fbd5d5ffb44d6de7a974 (diff)
mb/pcengines/apu2/romstage.c: disable SVI2 wait completion
On some platforms SVI command completion is not reported by voltage regulator. Because of that CPU got stuck in invalid P-State, which resulted in lower frequency and inability to reboot platform without performing cold reset. Change-Id: I260c997f3a0f4547041785a3b9de78e34d22812a Signed-off-by: Krystian Hebel <krystian.hebel@3mdeb.com> Reviewed-on: https://review.coreboot.org/c/30367 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Michał Żygowski <michal.zygowski@3mdeb.com> Reviewed-by: Piotr Król <piotr.krol@3mdeb.com> Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Diffstat (limited to 'src/mainboard')
-rw-r--r--src/mainboard/pcengines/apu2/romstage.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/src/mainboard/pcengines/apu2/romstage.c b/src/mainboard/pcengines/apu2/romstage.c
index a4bd816506..a1720d2ab4 100644
--- a/src/mainboard/pcengines/apu2/romstage.c
+++ b/src/mainboard/pcengines/apu2/romstage.c
@@ -105,6 +105,16 @@ void cache_as_ram_main(unsigned long bist, unsigned long cpu_init_detectedx)
post_code(0x39);
AGESAWRAPPER(amdinitearly);
+ /* Disable SVI2 controller to wait for command completion */
+ val = pci_read_config32(PCI_DEV(0, 0x18, 5), 0x12C);
+ if (val & (1 << 30)) {
+ printk(BIOS_DEBUG, "SVI2 Wait completion disabled\n");
+ } else {
+ printk(BIOS_DEBUG, "Disabling SVI2 Wait completion\n");
+ val |= (1 << 30);
+ pci_write_config32(PCI_DEV(0, 0x18, 5), 0x12C, val);
+ }
+
timestamp_add_now(TS_BEFORE_INITRAM);
post_code(0x40);