commit 53d9577838de5cd5a2d29dceb1779c9d080e170d
author Stephen Warren <swarren@nvidia.com> Wed Aug 19 15:15:41 2015 -0600
committer Tom Warren <twarren@nvidia.com> Wed Sep 16 16:10:22 2015 -0700
tree 7ca7ad2530ef0ab2e51164021d00c25f050618a0
parent d0a258902762ac137a4a8bedcbb94dc78786b1e9

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

diff --git a/include/configs/e2220-1170.h b/include/configs/e2220-1170.h
index dff3f2a..3bc6063 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 */

include/configs/p2371-0000.h

diff --git a/include/configs/p2371-0000.h b/include/configs/p2371-0000.h
index 9d7b650..397a0ef 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 */

include/configs/p2371-2180.h

diff --git a/include/configs/p2371-2180.h b/include/configs/p2371-2180.h
index 378d5a9..f311ae9 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 */

include/configs/p2571.h

diff --git a/include/configs/p2571.h b/include/configs/p2571.h
index 356c941..3bf9888 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 */