From bfac08472371d4d6d4fa56972b0e1166f780633a Mon Sep 17 00:00:00 2001 From: Stephen Warren <swarren@nvidia.com> Date: Wed, 19 Aug 2015 15:15:41 -0600 Subject: [PATCH] ARM: tegra: fix COUNTER_FREQUENCY for T210 While T210 boards all have 38.4MHz crystals, per the TRM, the only supported configuration is to divide the crystal frequency by 2 to generate clk_m, which is what feeds the ARM generic timers amongst other things. Fix the value of COUNTER_FREQUENCY to reflect this divide-by-2. When I queried the 19.2 value in Tom's original T210 patches, I wasn't aware of this extra divide-by-2, and didn't notice any effect from the incorrect value, since its only used if U-Boot is booted in EL3, whereas I'm booting it in EL2. Reported-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Tom Warren <twarren@nvidia.com> --- include/configs/e2220-1170.h | 3 ++- include/configs/p2371-0000.h | 3 ++- include/configs/p2371-2180.h | 3 ++- include/configs/p2571.h | 3 ++- 4 files changed, 8 insertions(+), 4 deletions(-) diff --git a/include/configs/e2220-1170.h b/include/configs/e2220-1170.h index dff3f2a357..3bc60637ed 100644 --- a/include/configs/e2220-1170.h +++ b/include/configs/e2220-1170.h @@ -60,6 +60,7 @@ #include "tegra-common-usb-gadget.h" #include "tegra-common-post.h" -#define COUNTER_FREQUENCY 38400000 +/* Crystal is 38.4MHz. clk_m runs at half that rate */ +#define COUNTER_FREQUENCY 19200000 #endif /* _E2220_1170_H */ diff --git a/include/configs/p2371-0000.h b/include/configs/p2371-0000.h index 9d7b650d98..397a0ef8ae 100644 --- a/include/configs/p2371-0000.h +++ b/include/configs/p2371-0000.h @@ -60,6 +60,7 @@ #include "tegra-common-usb-gadget.h" #include "tegra-common-post.h" -#define COUNTER_FREQUENCY 38400000 +/* Crystal is 38.4MHz. clk_m runs at half that rate */ +#define COUNTER_FREQUENCY 19200000 #endif /* _P2371_0000_H */ diff --git a/include/configs/p2371-2180.h b/include/configs/p2371-2180.h index 378d5a905e..f311ae9e7d 100644 --- a/include/configs/p2371-2180.h +++ b/include/configs/p2371-2180.h @@ -60,6 +60,7 @@ #include "tegra-common-usb-gadget.h" #include "tegra-common-post.h" -#define COUNTER_FREQUENCY 38400000 +/* Crystal is 38.4MHz. clk_m runs at half that rate */ +#define COUNTER_FREQUENCY 19200000 #endif /* _P2371_2180_H */ diff --git a/include/configs/p2571.h b/include/configs/p2571.h index 356c941a77..3bf9888472 100644 --- a/include/configs/p2571.h +++ b/include/configs/p2571.h @@ -61,7 +61,8 @@ #include "tegra-common-usb-gadget.h" #include "tegra-common-post.h" -#define COUNTER_FREQUENCY 38400000 +/* Crystal is 38.4MHz. clk_m runs at half that rate */ +#define COUNTER_FREQUENCY 19200000 #define CONFIG_OF_BOARD_SETUP #endif /* _P2571_H */ -- 2.39.5