diff options
| author | Gabe Black <gabeblack@google.com> | 2014-04-07 01:19:27 -0700 |
|---|---|---|
| committer | Marc Jones <marc.jones@se-eng.com> | 2014-12-15 19:58:43 +0100 |
| commit | 92dfa9c5814e7f0bb7830166a2fd7f2f04e336cb (patch) | |
| tree | a4eea9b193b3dcd46d086920868048e7ca32e55d /src/mainboard/google | |
| parent | 9d32739baaf86e845436aec6c43580c5626d3499 (diff) | |
| download | coreboot-92dfa9c5814e7f0bb7830166a2fd7f2f04e336cb.tar.xz | |
nyan*: Reduce the EC SPI bus frequency to 3 MHz.
The EC doesn't seem to be able to handle its bus running at 4 MHz or higher.
To avoid it not being able to keep up, we reduce the frequency of that bus on
all nyan derivatives to 3 MHz. Because PLLP can't be divided that low, we
switch the clock source to CLKM.
BUG=chrome-os-partner:22849
TEST=Built and booted on nyan.
BRANCH=None
Original-Change-Id: I8f31b41098d64634427b4686f5333012f643fada
Original-Signed-off-by: Gabe Black <gabeblack@google.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/193349
Original-Commit-Queue: Gabe Black <gabeblack@chromium.org>
Original-Tested-by: Gabe Black <gabeblack@chromium.org>
Original-Reviewed-by: Gabe Black <gabeblack@chromium.org>
(cherry picked from commit c215c50a5bb982b0e671c951e2fe8df06db85db2)
Signed-off-by: Marc Jones <marc.jones@se-eng.com>
Change-Id: Ia60513d118aed8881927e9d52f170e27655ea8e7
Reviewed-on: http://review.coreboot.org/7739
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Diffstat (limited to 'src/mainboard/google')
| -rw-r--r-- | src/mainboard/google/nyan/romstage.c | 2 | ||||
| -rw-r--r-- | src/mainboard/google/nyan_big/romstage.c | 2 | ||||
| -rw-r--r-- | src/mainboard/google/nyan_blaze/romstage.c | 2 |
3 files changed, 3 insertions, 3 deletions
diff --git a/src/mainboard/google/nyan/romstage.c b/src/mainboard/google/nyan/romstage.c index eeec9bdb56..7310cc873a 100644 --- a/src/mainboard/google/nyan/romstage.c +++ b/src/mainboard/google/nyan/romstage.c @@ -129,7 +129,7 @@ static void setup_pinmux(void) static void configure_ec_spi_bus(void) { - clock_configure_source(sbc1, PLLP, 5000); + clock_configure_source(sbc1, CLK_M, 3000); } static void configure_tpm_i2c_bus(void) diff --git a/src/mainboard/google/nyan_big/romstage.c b/src/mainboard/google/nyan_big/romstage.c index 6327c97ba3..d7cc1bf3a3 100644 --- a/src/mainboard/google/nyan_big/romstage.c +++ b/src/mainboard/google/nyan_big/romstage.c @@ -129,7 +129,7 @@ static void setup_pinmux(void) static void configure_ec_spi_bus(void) { - clock_configure_source(sbc1, PLLP, 5000); + clock_configure_source(sbc1, CLK_M, 3000); } static void configure_tpm_i2c_bus(void) diff --git a/src/mainboard/google/nyan_blaze/romstage.c b/src/mainboard/google/nyan_blaze/romstage.c index 6327c97ba3..d7cc1bf3a3 100644 --- a/src/mainboard/google/nyan_blaze/romstage.c +++ b/src/mainboard/google/nyan_blaze/romstage.c @@ -129,7 +129,7 @@ static void setup_pinmux(void) static void configure_ec_spi_bus(void) { - clock_configure_source(sbc1, PLLP, 5000); + clock_configure_source(sbc1, CLK_M, 3000); } static void configure_tpm_i2c_bus(void) |