diff options
Diffstat (limited to 'src/mainboard/google')
| -rw-r--r-- | src/mainboard/google/gru/mainboard.c | 39 |
1 files changed, 30 insertions, 9 deletions
diff --git a/src/mainboard/google/gru/mainboard.c b/src/mainboard/google/gru/mainboard.c index dd986c4348..d1ce1649ca 100644 --- a/src/mainboard/google/gru/mainboard.c +++ b/src/mainboard/google/gru/mainboard.c @@ -245,39 +245,60 @@ static void usb_power_cycle(int port) static void setup_usb(void) { - /* A few magic PHY tuning values that improve eye diagram amplitude - * and make it extra sure we get reliable communication in firmware. */ - /* Set max ODT compensation voltage and current tuning reference. */ + /* + * A few magic PHY tuning values that improve eye diagram amplitude + * and make it extra sure we get reliable communication in firmware + * Set max ODT compensation voltage and current tuning reference. + */ write32(&rk3399_grf->usbphy0_ctrl[3], RK_CLRSETBITS(0xfff, 0x2e3)); write32(&rk3399_grf->usbphy1_ctrl[3], RK_CLRSETBITS(0xfff, 0x2e3)); if (IS_ENABLED(CONFIG_BOARD_GOOGLE_KEVIN)) { - /* Set max pre-emphasis level, only on Kevin PHY0 and PHY1 */ + /* Set max pre-emphasis level, only on Kevin PHY0 and PHY1. */ write32(&rk3399_grf->usbphy0_ctrl[12], RK_CLRSETBITS(0xffff, 0xa7)); write32(&rk3399_grf->usbphy1_ctrl[12], RK_CLRSETBITS(0xffff, 0xa7)); - /* Disable the pre-emphasize in eop state and chirp + /* + * Disable the pre-emphasize in eop state and chirp * state to avoid mis-trigger the disconnect detection - * and also avoid high-speed handshake fail */ + * and also avoid high-speed handshake fail for PHY0 + * and PHY1 consist of otg-port and host-port. + */ write32(&rk3399_grf->usbphy0_ctrl[0], RK_CLRBITS(0x3)); write32(&rk3399_grf->usbphy1_ctrl[0], RK_CLRBITS(0x3)); write32(&rk3399_grf->usbphy0_ctrl[13], RK_CLRBITS(0x3)); write32(&rk3399_grf->usbphy1_ctrl[13], RK_CLRBITS(0x3)); - /* ODT auto compensation bypass, set max driver strength */ + /* + * ODT auto compensation bypass, and set max driver + * strength only for PHY0 and PHY1 otg-port. + */ write32(&rk3399_grf->usbphy0_ctrl[2], RK_CLRSETBITS(0x7e << 4, 0x60 << 4)); write32(&rk3399_grf->usbphy1_ctrl[2], RK_CLRSETBITS(0x7e << 4, 0x60 << 4)); - /* ODT auto refresh bypass, and set the max - * bias current tuning reference */ + /* + * ODT auto refresh bypass, and set the max bias current + * tuning reference only for PHY0 and PHY1 otg-port. + */ write32(&rk3399_grf->usbphy0_ctrl[3], RK_CLRSETBITS(0x21c, 1 << 4)); write32(&rk3399_grf->usbphy1_ctrl[3], RK_CLRSETBITS(0x21c, 1 << 4)); + + /* + * ODT auto compensation bypass, and set default driver + * strength only for PHY0 and PHY1 host-port. + */ + write32(&rk3399_grf->usbphy0_ctrl[15], RK_SETBITS(1 << 10)); + write32(&rk3399_grf->usbphy1_ctrl[15], RK_SETBITS(1 << 10)); + + /* ODT auto refresh bypass only for PHY0 and PHY1 host-port. */ + write32(&rk3399_grf->usbphy0_ctrl[16], RK_CLRBITS(1 << 9)); + write32(&rk3399_grf->usbphy1_ctrl[16], RK_CLRBITS(1 << 9)); } setup_usb_otg0(); |