Revert "mb/google/poppy/variant/atlas: I2C: run trackpad at 1MHz"
This reverts commit 7696290004b6490c7ef8027d7ddf67b163e7dad8.
We're seeing trackpad problems on some units with the I2C bus running
at 1MHz but not at 400KHz. So, revert back to 400KHz until we
understand how to make 1MHz operation more robust.
BUG=b:123650686
Change-Id: Ifb06afece9eee0c153240d35e6c3001f5b74f310
Signed-off-by: Caveh Jalali <caveh@chromium.org>
Reviewed-on: https://review.coreboot.org/c/31212
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
diff --git a/src/mainboard/google/poppy/variants/atlas/devicetree.cb b/src/mainboard/google/poppy/variants/atlas/devicetree.cb
index f8a6e6d..275b27d 100644
--- a/src/mainboard/google/poppy/variants/atlas/devicetree.cb
+++ b/src/mainboard/google/poppy/variants/atlas/devicetree.cb
@@ -207,15 +207,14 @@
.fall_time_ns = 38,
},
.i2c[2] = {
- .speed = I2C_SPEED_FAST_PLUS,
+ .speed = I2C_SPEED_FAST,
.speed_config[0] = {
- .speed = I2C_SPEED_FAST_PLUS,
- .scl_lcnt = 69,
- .scl_hcnt = 33,
- .sda_hold = 20,
- }
+ .speed = I2C_SPEED_FAST,
+ .scl_lcnt = 186,
+ .scl_hcnt = 93,
+ .sda_hold = 36,
+ },
},
-
.i2c[3] = {
.speed = I2C_SPEED_FAST,
.rise_time_ns = 98,
@@ -296,7 +295,6 @@
register "generic.hid" = ""ACPI0C50""
register "generic.desc" = ""ELAN Touchpad""
register "generic.irq" = "ACPI_IRQ_EDGE_LOW(GPP_A19_IRQ)"
- register "generic.speed" = "I2C_SPEED_FAST_PLUS"
register "generic.wake" = "GPE0_DW0_23" # GPP_A23
register "hid_desc_reg_offset" = "0x01"
device i2c 0x15 on end