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authorRyan Lin <ryan.lin@intel.com>2014-09-22 23:29:16 -0700
committerPatrick Georgi <pgeorgi@google.com>2015-03-21 08:44:28 +0100
commitbd978851b0988d32d2c7e85e493c32a5245e892c (patch)
treeb9e0cab9ce1e4df4caaf4d7cd8aa68d323471c7b /src/superio/ite/it8772f
parentde77e6a99f37651aefe0abe3015dc7abc5562f54 (diff)
superio: ite8772f: Exit extemp busy state
It causes fan top speed due to this bug + our board-specific workaround, and causes invalid temperature sensor readings. Therefore, re-configure the register "External Temperature Sensor Host Control Register" to terminate processes when this issue happens. BUG=chromium:402204 TEST=ran suspend_stress_test 500 times Change-Id: I439d5de798fbe999e4eec5497e6969b7b453121b Signed-off-by: Patrick Georgi <pgeorgi@chromium.org> Original-Commit-Id: b82f2922c7fce3ca6b2797a8d9775e9db2817fe9 Original-Change-Id: I6e71b6a46a31b00e541c304f1ed58c1678c1d42e Original-Signed-off-by: Ryan Lin <ryan.lin@intel.com> Original-Reviewed-on: https://chromium-review.googlesource.com/219445 Original-Reviewed-by: Shawn Nematbakhsh <shawnn@chromium.org> Reviewed-on: http://review.coreboot.org/8820 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Diffstat (limited to 'src/superio/ite/it8772f')
-rw-r--r--src/superio/ite/it8772f/it8772f.h1
-rw-r--r--src/superio/ite/it8772f/superio.c36
2 files changed, 37 insertions, 0 deletions
diff --git a/src/superio/ite/it8772f/it8772f.h b/src/superio/ite/it8772f/it8772f.h
index 43e7d4cf43..d1d898aea6 100644
--- a/src/superio/ite/it8772f/it8772f.h
+++ b/src/superio/ite/it8772f/it8772f.h
@@ -70,6 +70,7 @@
#define IT8772F_FAN_CTL_AUTO_SMOOTHING_DIS (0 << 7)
#define IT8772F_FAN_CTL_AUTO_SMOOTHING_EN (1 << 7)
#define IT8772F_EXTEMP_STATUS 0x88
+#define IT8772F_EXTEMP_STATUS_HOST_BUSY (1 << 0)
#define IT8772F_EXTEMP_ADDRESS 0x89
#define IT8772F_EXTEMP_WRITE_LENGTH 0x8a
#define IT8772F_EXTEMP_READ_LENGTH 0x8b
diff --git a/src/superio/ite/it8772f/superio.c b/src/superio/ite/it8772f/superio.c
index ca103518a4..4d83280241 100644
--- a/src/superio/ite/it8772f/superio.c
+++ b/src/superio/ite/it8772f/superio.c
@@ -22,6 +22,7 @@
#include <device/pnp.h>
#include <pc80/keyboard.h>
#include <arch/io.h>
+#include <delay.h>
#include <stdlib.h>
#include <superio/conf_mode.h>
@@ -40,6 +41,34 @@ static inline void it8772f_envc_write(struct resource *res, u8 addr, u8 value)
outb(value, res->base + 6);
}
+static void it8772f_extemp_force_idle_status(struct resource *res)
+{
+ u8 reg;
+ int retries = 10;
+
+ /* Wait up to 10ms for non-busy state. */
+ while (retries > 0) {
+ reg = it8772f_envc_read(res, IT8772F_EXTEMP_STATUS);
+
+ if ((reg & IT8772F_EXTEMP_STATUS_HOST_BUSY) == 0x0)
+ break;
+
+ retries--;
+
+ mdelay(1);
+ }
+
+ if (retries == 0 && (reg & IT8772F_EXTEMP_STATUS_HOST_BUSY) == 0x1) {
+ /*
+ * SIO is busy due to unfinished peci transaction.
+ * Re-configure Register 0x8E to terminate processes.
+ */
+ it8772f_envc_write(res, IT8772F_EXTEMP_CONTROL,
+ IT8772F_EXTEMP_CONTROL_AUTO_4HZ |
+ IT8772F_EXTEMP_CONTROL_AUTO_START);
+ }
+}
+
/*
* Setup External Temperature to read via PECI into TMPINx register
*/
@@ -142,6 +171,13 @@ static void it8772f_init(struct device *dev)
it8772f_enable_fan(res, 2);
if (conf->fan3_enable)
it8772f_enable_fan(res, 3);
+
+ /*
+ * System may get wrong temperature data when SIO is in
+ * busy state. Therefore, check the status and terminate
+ * processes if needed.
+ */
+ it8772f_extemp_force_idle_status(res);
break;
case IT8772F_GPIO:
/* Set GPIO output levels */