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-rw-r--r--payloads/libpayload/drivers/timer/ipq806x.c22
1 files changed, 20 insertions, 2 deletions
diff --git a/payloads/libpayload/drivers/timer/ipq806x.c b/payloads/libpayload/drivers/timer/ipq806x.c
index 4edbf8eda0..0d70a86813 100644
--- a/payloads/libpayload/drivers/timer/ipq806x.c
+++ b/payloads/libpayload/drivers/timer/ipq806x.c
@@ -29,13 +29,31 @@
#include <libpayload.h>
+/*
+ * TODO(vbendeb): reverted this hack once proper timer code is in place (see
+ * http://crosbug.com/p/28880 for details.
+ */
+#define MIN_TIMER_FREQ 1000000
+
uint64_t timer_hz(void)
{
- return CONFIG_LP_IPQ806X_TIMER_FREQ;
+ return (CONFIG_LP_IPQ806X_TIMER_FREQ >= MIN_TIMER_FREQ) ?
+ CONFIG_LP_IPQ806X_TIMER_FREQ : MIN_TIMER_FREQ;
}
uint64_t timer_raw_value(void)
{
- return readl((void *)CONFIG_LP_IPQ806X_TIMER_REG);
+ uint64_t rawv = readl((void *)CONFIG_LP_IPQ806X_TIMER_REG);
+
+ /*
+ * This is extremely crude, but it kicks in only for the case when the
+ * timer clock frequency is below 1MHz, which should never be the case
+ * on a properly configured system. The compiler will eliminate the
+ * check as long as config value exceeds 1MHz.
+ */
+ if (CONFIG_LP_IPQ806X_TIMER_FREQ < MIN_TIMER_FREQ)
+ rawv *= (MIN_TIMER_FREQ / CONFIG_LP_IPQ806X_TIMER_FREQ);
+
+ return rawv;
}