diff options
| author | Duncan Laurie <dlaurie@google.com> | 2020-07-24 12:37:22 -0700 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2020-07-29 09:36:11 +0000 |
| commit | 3715785a49de6c0220f4c832130764fe9f72b570 (patch) | |
| tree | 96fb850f3b5855b6f379eb51e6035b8e37abe87c | |
| parent | 70b73cfc7869179cd1ddff1bd5b2c28db608fc6c (diff) | |
soc/intel/tigerlake: Set default USB3 de-emphasis to -3.5dB
The HSIO tuning guide recommendation for the default USB3 settings is to
have de-emphasis set to -3.5dB with the equation 20*log(X/64). 0x29 results
in a value close to -3.5dB and it is the value that was used for the default
on past platforms so I used it here as well.
BUG=b:160721468
TEST=Ensure WWAN device does not disconnect during use.
Change-Id: Ia594996cb55523dacce0d4bef98cc217321c62de
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43831
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
| -rw-r--r-- | src/soc/intel/tigerlake/include/soc/usb.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/soc/intel/tigerlake/include/soc/usb.h b/src/soc/intel/tigerlake/include/soc/usb.h index 247b0ba554..d4836c9144 100644 --- a/src/soc/intel/tigerlake/include/soc/usb.h +++ b/src/soc/intel/tigerlake/include/soc/usb.h @@ -132,7 +132,7 @@ struct usb3_port_config { #define USB3_PORT_DEFAULT(pin) { \ .enable = 1, \ .ocpin = (pin), \ - .tx_de_emp = 0x0, \ + .tx_de_emp = 0x29, \ .tx_downscale_amp = 0x00, \ } |