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| author | Lu Zhang <lu.zhang@bitland.corp-partner.google.com> | 2019-09-28 17:07:25 +0800 |
|---|---|---|
| committer | Commit Bot <commit-bot@chromium.org> | 2019-10-15 07:56:41 +0000 |
| commit | c469aa1bcbef30ee57f12e4f99799ca8b95d576c (patch) | |
| tree | 7bb593df3883a16ebaf1297bf0ae1eb138e66447 | |
| parent | 77e67bc317ebef9be9acc91e42c4a558a7ff3564 (diff) | |
| download | chrome-ec-c469aa1bcbef30ee57f12e4f99799ca8b95d576c.tar.gz | |
treeya: apply USB EQ setting to PS8751 USB mux
The default USB TYPE C connector facing receiver equalization
setting is 0x90, compensate for channel loss up to 15.4dB
It's high for some dongles. Apply lower USB EQ to 8.7dB
BUG=b:140472120
BRANCH=none
TEST=build and boot on, read back registers to verify
> ectool i2cread 8 2 0x16 0xe7
0x40
Signed-off-by: Lu Zhang <lu.zhang@bitland.corp-partner.google.com>
Change-Id: I1fce255d0dbe8c5a12cf8c8ff5b3c506e8d19475
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/1830538
Reviewed-by: Edward Hill <ecgh@chromium.org>
Reviewed-by: Paul Ma <magf@bitland.corp-partner.google.com>
Tested-by: Paul Ma <magf@bitland.corp-partner.google.com>
| -rw-r--r-- | baseboard/grunt/baseboard.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/baseboard/grunt/baseboard.c b/baseboard/grunt/baseboard.c index fe25dec5c9..02641f9e66 100644 --- a/baseboard/grunt/baseboard.c +++ b/baseboard/grunt/baseboard.c @@ -277,6 +277,17 @@ void board_reset_pd_mcu(void) #endif } +static uint32_t sku_id; + +static int ps8751_tune_mux(int port) +{ + /* Tune USB mux registers for treeya's port 1 Rx measurement */ + if ((sku_id >= 0xa0) && (sku_id <= 0xaf)) + mux_write(port, PS8XXX_REG_MUX_USB_C2SS_EQ, 0x40); + + return EC_SUCCESS; +} + struct usb_mux usb_muxes[CONFIG_USB_PD_PORT_COUNT] = { #ifdef VARIANT_GRUNT_TCPC_0_ANX3429 [USB_PD_PORT_ANX74XX] = { @@ -292,6 +303,7 @@ struct usb_mux usb_muxes[CONFIG_USB_PD_PORT_COUNT] = { [USB_PD_PORT_PS8751] = { .driver = &tcpci_tcpm_usb_mux_driver, .hpd_update = &ps8xxx_tcpc_update_hpd_status, + .board_init = &ps8751_tune_mux, } }; @@ -700,7 +712,6 @@ static int board_get_gpio_board_version(void) } static int board_version; -static uint32_t sku_id; static void cbi_init(void) { |