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drivers: usb_c: tcpc: stm32: Explicitly set the unconnected CC line to OPEN

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Explicitly set the unconnected CC line to OPEN, so that it can be
used for VCONN.

Signed-off-by: Sam Hurst <sbh1187@gmail.com>
This commit is contained in:
Sam Hurst 2022-12-14 12:03:29 -08:00 • committed by Carles Cufí
commit a19cf99aa3
1 changed files with 38 additions and 23 deletions
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61
drivers/usb_c/tcpc/ucpd_stm32.c
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@ -144,6 +144,28 @@ static void stm32_ucpd_state_init(const struct device *dev)
data->ucpd_vconn_enable = false;
}
/**
* @brief Get the CC enable mask. The mask indicates which CC line
* is enabled.
*
* @retval CC Enable mask (bit 0: CC1, bit 1: CC2)
*/
static uint32_t ucpd_get_cc_enable_mask(const struct device *dev)
{
struct tcpc_data *data = dev->data;
const struct tcpc_config *const config = dev->config;
uint32_t mask = UCPD_CR_CCENABLE_Msk;
if (data->ucpd_vconn_enable) {
uint32_t cr = LL_UCPD_ReadReg(config->ucpd_port, CR);
int pol = (cr & UCPD_CR_PHYCCSEL);
mask &= ~BIT(UCPD_CR_CCENABLE_Pos + !pol);
}
return mask;
}
/**
* @brief Get the state of the CC1 and CC2 lines
*
@ -159,6 +181,7 @@ static int ucpd_get_cc(const struct device *dev,
int vstate_cc2;
int anamode;
uint32_t sr;
uint32_t cc_msk;
/*
* cc_voltage_state is determined from vstate_cc bit field in the
@ -206,32 +229,24 @@ static int ucpd_get_cc(const struct device *dev,
}
}
*cc1 = vstate_cc1;
*cc2 = vstate_cc2;
/* CC connection detection */
cc_msk = ucpd_get_cc_enable_mask(dev);
return 0;
}
/**
* @brief Get the CC enable mask. The mask indicates which CC line
* is enabled.
*
* @retval CC Enable mask (bit 0: CC1, bit 1: CC2)
*/
static uint32_t ucpd_get_cc_enable_mask(const struct device *dev)
{
struct tcpc_data *data = dev->data;
const struct tcpc_config *const config = dev->config;
uint32_t mask = UCPD_CR_CCENABLE_Msk;
if (data->ucpd_vconn_enable) {
uint32_t cr = LL_UCPD_ReadReg(config->ucpd_port, CR);
int pol = (cr & UCPD_CR_PHYCCSEL);
mask &= ~BIT(UCPD_CR_CCENABLE_Pos + !pol);
/* CC1 connection detection */
if (cc_msk & UCPD_CR_CCENABLE_0) {
*cc1 = vstate_cc1;
} else {
*cc1 = TC_CC_VOLT_OPEN;
}
return mask;
/* CC2 connection detection */
if (cc_msk & UCPD_CR_CCENABLE_1) {
*cc2 = vstate_cc2;
} else {
*cc2 = TC_CC_VOLT_OPEN;
}
return 0;
}
/**