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authorTom Warren <twarren@nvidia.com>2014-04-30 14:51:38 -0700
committerMarc Jones <marc.jones@se-eng.com>2014-12-26 19:39:16 +0100
commitbb932c56f0ba7890697fe2666cc63d2a215d95f1 (patch)
treed5cbde42d3efadf3417d6b4a1073f925f8f62e1d /src/mainboard/google/nyan/reset.c
parentfa95a6fb60ccb0a94a041fbad5a2b6fd8cf809fa (diff)
downloadcoreboot-bb932c56f0ba7890697fe2666cc63d2a215d95f1.tar.xz
nyan*: I2C: Implement bus clear when 'ARB_LOST' error occurs
This is a fix for the 'Lost arb' we're seeing on Nyan* during reboot stress testing. It occurs when we are slamming the default PMIC registers with pmic_write_reg(). Currently, I've only captured this a few times, and the bus clear seemed to work, as the PMIC writes continued (where they'd hang the system before bus clear) for a couple of regs, then it hangs hard, no messages, no 2nd lost arb, etc. So I've added code to the PMIC write function that will reset the SoC if any I2C error occurs. That seems to recover OK, i.e. on the next reboot the PMIC writes all go thru, boot is OK, kernel loads, etc. BUG=chrome-os-partner:28323 BRANCH=nyan TEST=Tested on nyan. Built for nyan and nyan_big. Original-Change-Id: I1ac5e3023ae22c015105b7f0fb7849663b4aa982 Original-Signed-off-by: Tom Warren <twarren@nvidia.com> Original-Reviewed-on: https://chromium-review.googlesource.com/197732 Original-Reviewed-by: Julius Werner <jwerner@chromium.org> Original-Reviewed-by: Jimmy Zhang <jimmzhang@nvidia.com> (cherry picked from commit f445127e2d9e223a5ef9117008a7ac7631a7980c) Signed-off-by: Marc Jones <marc.jones@se-eng.com> Change-Id: I584d55b99d65f1e278961db6bdde1845cb01f3bc Reviewed-on: http://review.coreboot.org/7897 Tested-by: build bot (Jenkins) Reviewed-by: David Hendricks <dhendrix@chromium.org>
Diffstat (limited to 'src/mainboard/google/nyan/reset.c')
-rw-r--r--src/mainboard/google/nyan/reset.c29
1 files changed, 29 insertions, 0 deletions
diff --git a/src/mainboard/google/nyan/reset.c b/src/mainboard/google/nyan/reset.c
new file mode 100644
index 0000000000..7f1fff922a
--- /dev/null
+++ b/src/mainboard/google/nyan/reset.c
@@ -0,0 +1,29 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2014 Google Inc.
+ *
+ * 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
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <arch/io.h>
+#include <soc/nvidia/tegra124/gpio.h>
+
+#include "reset.h"
+
+void cpu_reset(void)
+{
+ gpio_output(GPIO(I5), 0);
+ while(1);
+}