Tegra: fixup CNTPS_TVAL_EL1 delay timer reads
The delay_timer driver for Tegra uses the CNTPS_TVAL_EL1 secure, physical,
decrementing timer as the source. The current logic incorrectly marks this
as an incrementing timer, by negating the timer value.
This patch fixes the anomaly and updates the driver to remove this logic.
Signed-off-by: anzhou <anzhou@nvidia.com>
Change-Id: I60490bdcaf0b66bf4553a6de3f4e4e32109017f4
diff --git a/plat/nvidia/tegra/common/tegra_delay_timer.c b/plat/nvidia/tegra/common/tegra_delay_timer.c
index cfd9a15..d9547c4 100644
--- a/plat/nvidia/tegra/common/tegra_delay_timer.c
+++ b/plat/nvidia/tegra/common/tegra_delay_timer.c
@@ -22,11 +22,9 @@
/*
* Generic delay timer implementation expects the timer to be a down
- * counter. We apply bitwise NOT operator to the tick values returned
- * by read_cntps_tval_el1() to simulate the down counter. The value is
- * clipped from 64 to 32 bits.
+ * counter. The value is clipped from 64 to 32 bits.
*/
- return (uint32_t)(~read_cntps_tval_el1());
+ return (uint32_t)(read_cntps_tval_el1());
}
/*