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| author | Nicolas Boichat <drinkcat@google.com> | 2016-07-29 11:25:09 +0800 |
|---|---|---|
| committer | chrome-bot <chrome-bot@chromium.org> | 2016-08-21 22:03:34 -0700 |
| commit | e3297d725517de90a657e157f3ceafe53b2b13f2 (patch) | |
| tree | f642d92bf18b7f3407327b1e4bfc21cb256def47 | |
| parent | b387bdf40ec8e1929cd5a8b96464bec8e9ee5d94 (diff) | |
| download | chrome-ec-e3297d725517de90a657e157f3ceafe53b2b13f2.tar.gz | |
anx7688: Add custom vbus function
On ANX7688, POWER_STATUS.VBusPresent is averaged 16 times, so its
value may not be set to 1 quickly enough during power role swap.
Therefore, we use a proprietary register to read the unfiltered VBus
value.
BRANCH=oak
BUG=chrome-os-partner:55221
TEST=LG monitor works over type-C, power role swap looks good
Change-Id: I68572c34440be65882f431bb892ed032da05bd0a
Reviewed-on: https://chromium-review.googlesource.com/364351
Commit-Ready: Nicolas Boichat <drinkcat@chromium.org>
Tested-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
| -rw-r--r-- | driver/tcpm/anx7688.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/driver/tcpm/anx7688.c b/driver/tcpm/anx7688.c index 7e499629a8..ae1dd32124 100644 --- a/driver/tcpm/anx7688.c +++ b/driver/tcpm/anx7688.c @@ -160,12 +160,27 @@ static int anx7688_mux_set(int i2c_addr, mux_state_t mux_state) return tcpc_write(port, TCPC_REG_CONFIG_STD_OUTPUT, reg); } +#ifdef CONFIG_USB_PD_VBUS_DETECT_TCPC +static int anx7688_tcpm_get_vbus_level(int port) +{ + int reg = 0; + + /* On ANX7688, POWER_STATUS.VBusPresent (bit 2) is averaged 16 times, so + * its value may not be set to 1 quickly enough during power role swap. + * Therefore, we use a proprietary register to read the unfiltered VBus + * value. See crosbug.com/p/55221 . + */ + i2c_read8(I2C_PORT_TCPC, 0x50, 0x40, ®); + return ((reg & 0x10) ? 1 : 0); +} +#endif + /* ANX7688 is a TCPCI compatible port controller */ const struct tcpm_drv anx7688_tcpm_drv = { .init = &anx7688_init, .get_cc = &tcpci_tcpm_get_cc, #ifdef CONFIG_USB_PD_VBUS_DETECT_TCPC - .get_vbus_level = &tcpci_tcpm_get_vbus_level, + .get_vbus_level = &anx7688_tcpm_get_vbus_level, #endif .set_cc = &tcpci_tcpm_set_cc, .set_polarity = &tcpci_tcpm_set_polarity, |