nyan: tpm: Increase the TPM frequency to 400 KHz.
The TPM now works correctly with the I2C bus running at 400 KHz. Running it at
that frequency saves some boot time.
CQ-DEPEND=CL:191634
CQ-DEPEND=CL:191793
BUG=chrome-os-partner:27220
TEST=Built and booted on nyan with and without EFS.
BRANCH=None
Change-Id: I157308c2745342dc1ada4499433004c7ce1c6435
Signed-off-by: Gabe Black <gabeblack@google.com>
Reviewed-on: https://chromium-review.googlesource.com/191813
Reviewed-by: Tom Warren <twarren@nvidia.com>
Reviewed-by: Jimmy Zhang <jimmzhang@nvidia.com>
Reviewed-by: Gabe Black <gabeblack@chromium.org>
Tested-by: Gabe Black <gabeblack@chromium.org>
diff --git a/src/mainboard/google/nyan/romstage.c b/src/mainboard/google/nyan/romstage.c
index ee54a50..eeec9bd 100644
--- a/src/mainboard/google/nyan/romstage.c
+++ b/src/mainboard/google/nyan/romstage.c
@@ -134,12 +134,7 @@
static void configure_tpm_i2c_bus(void)
{
- /*
- * The TPM is on I2C3 and can theoretically run at 400 KHz but doesn't
- * seem to work above around 40 KHz. It's set to run at 100 KHz in the
- * kernel.
- */
- clock_configure_i2c_scl_freq(i2c3, PLLP, 40);
+ clock_configure_i2c_scl_freq(i2c3, PLLP, 400);
i2c_init(2);
}
diff --git a/src/mainboard/google/nyan_big/romstage.c b/src/mainboard/google/nyan_big/romstage.c
index e1597c8..6327c97 100644
--- a/src/mainboard/google/nyan_big/romstage.c
+++ b/src/mainboard/google/nyan_big/romstage.c
@@ -134,12 +134,7 @@
static void configure_tpm_i2c_bus(void)
{
- /*
- * The TPM is on I2C3 and can theoretically run at 400 KHz but doesn't
- * seem to work above around 40 KHz. It's set to run at 100 KHz in the
- * kernel.
- */
- clock_configure_i2c_scl_freq(i2c3, PLLP, 40);
+ clock_configure_i2c_scl_freq(i2c3, PLLP, 400);
i2c_init(2);
}
diff --git a/src/mainboard/google/nyan_blaze/romstage.c b/src/mainboard/google/nyan_blaze/romstage.c
index e1597c8..6327c97 100644
--- a/src/mainboard/google/nyan_blaze/romstage.c
+++ b/src/mainboard/google/nyan_blaze/romstage.c
@@ -134,12 +134,7 @@
static void configure_tpm_i2c_bus(void)
{
- /*
- * The TPM is on I2C3 and can theoretically run at 400 KHz but doesn't
- * seem to work above around 40 KHz. It's set to run at 100 KHz in the
- * kernel.
- */
- clock_configure_i2c_scl_freq(i2c3, PLLP, 40);
+ clock_configure_i2c_scl_freq(i2c3, PLLP, 400);
i2c_init(2);
}
