diff options
| author | Daolong Zhu <jg_daolongzhu@mediatek.corp-partner.google.com> | 2021-09-15 13:01:55 +0800 |
|---|---|---|
| committer | Felix Held <felix-coreboot@felixheld.de> | 2021-10-02 11:48:34 +0000 |
| commit | f4b71734b266b5cf276e7bd3b0de45553a0728bd (patch) | |
| tree | 85e45203fb6a32dc86f527c74ef9c9f4ae9d369e /src/mainboard/google/cherry/mainboard.c | |
| parent | 38abbdab71e6bf275c9c49748f1830576ddb2f22 (diff) | |
soc/mediatek: Fix I2C failures by adjusting AC timing and bus speed
1. The original algorithm for I2C speed cannot always make the
timing meet I2C specification so a new algorithm is introduced
to calculate the timing parameters more correctly.
2. Some I2C buses should be initialized in a different speed while
the original implementation was fixed at fast mode (400Khz).
So the mtk_i2c_bus_init is now also taking an extra speed
parameter.
There is an equivalent change in kernel side:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/i2c/busses/i2c-mt65xx.c?h=v5.15-rc3&id=be5ce0e97cc7a5c0d2da45d617b7bc567c3d3fa1
BUG=b:189899864
TEST=Test on Tomato, boot pass and timing pass
at 100/300/400/500/800/1000Khz.
Signed-off-by: Daolong Zhu <jg_daolongzhu@mediatek.corp-partner.google.com>
Change-Id: Id25b7bb3a76908a7943b940eb5bee799e80626a0
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58053
Reviewed-by: Rex-BC Chen <rex-bc.chen@mediatek.corp-partner.google.com>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src/mainboard/google/cherry/mainboard.c')
| -rw-r--r-- | src/mainboard/google/cherry/mainboard.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/src/mainboard/google/cherry/mainboard.c b/src/mainboard/google/cherry/mainboard.c index 7b9ba658d1..a09705019e 100644 --- a/src/mainboard/google/cherry/mainboard.c +++ b/src/mainboard/google/cherry/mainboard.c @@ -131,7 +131,7 @@ static void configure_sdcard(void) MSDC1_GPIO_MODE1_2, MSDC1_GPIO_MODE1_VALUE, MSDC1_GPIO_MODE1_3, MSDC1_GPIO_MODE1_VALUE); - mtk_i2c_bus_init(I2C7); + mtk_i2c_bus_init(I2C7, I2C_SPEED_FAST); if (CONFIG(BOARD_GOOGLE_CHERRY)) mt6360_init(I2C7); @@ -205,7 +205,7 @@ static void mainboard_init(struct device *dev) /* for audio usage */ if (CONFIG(CHERRY_USE_RT1011)) - mtk_i2c_bus_init(I2C2); + mtk_i2c_bus_init(I2C2, I2C_SPEED_FAST); if (dpm_init()) printk(BIOS_ERR, "dpm init failed, DVFS may not work\n"); |