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drivers: espi: Obtain correct Rx lenght during OOB transaction.

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MEC15xx eSPI OOB RX length register holds received message length
and receive buffer length, need to extract rcvd msg length.

Signed-off-by: Jose Alberto Meza <jose.a.meza.arellano@intel.com>
This commit is contained in:
Jose Alberto Meza 2020-03-10 15:04:28 -07:00 • committed by Andrew Boie
commit b803b32541
1 changed files with 10 additions and 9 deletions
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19
drivers/espi/espi_mchp_xec.c
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@ -417,16 +417,17 @@ static int espi_xec_send_oob(struct device *dev, struct espi_oob_packet pckt)
LOG_DBG("%s\n", __func__);
if (!(ESPI_OOB_REGS->TX_STS & MCHP_ESPI_OOB_TX_STS_CHEN)) {
LOG_WRN("OOB channel is disabled\n");
LOG_ERR("OOB channel is disabled");
return -EIO;
}
if (ESPI_OOB_REGS->TX_STS & MCHP_ESPI_OOB_TX_STS_BUSY) {
LOG_WRN("OOB channel is busy\n");
LOG_ERR("OOB channel is busy");
return -EBUSY;
}
if (pckt.len > MAX_OOB_BUFFER_SIZE) {
LOG_ERR("insufficient space");
return -EINVAL;
}
@ -434,7 +435,7 @@ static int espi_xec_send_oob(struct device *dev, struct espi_oob_packet pckt)
ESPI_OOB_REGS->TX_LEN = pckt.len;
ESPI_OOB_REGS->TX_CTRL = MCHP_ESPI_OOB_TX_CTRL_START;
LOG_DBG("%s %d\n", __func__, ESPI_OOB_REGS->TX_LEN);
LOG_DBG("%s %d", __func__, ESPI_OOB_REGS->TX_LEN);
/* Wait until ISR or timeout */
ret = k_sem_take(&data->tx_lock, MAX_OOB_TIMEOUT);
@ -457,9 +458,6 @@ static int espi_xec_receive_oob(struct device *dev,
MCHP_ESPI_OOB_RX_STS_OVRUN;
struct espi_xec_data *data = (struct espi_xec_data *)(dev->driver_data);
LOG_DBG("%s\n", __func__);
if (ESPI_OOB_REGS->TX_STS & err_mask) {
return -EIO;
}
@ -470,12 +468,15 @@ static int espi_xec_receive_oob(struct device *dev,
return -ETIMEDOUT;
}
/* Check if buffer passed to driver can fit the received packet */
if (ESPI_OOB_REGS->RX_LEN > pckt.len) {
/* Check if buffer passed to driver can fit the received buffer */
u32_t rcvd_len = ESPI_OOB_REGS->RX_LEN & ESPI_XEC_OOB_RX_LEN_MASK;
if (rcvd_len > pckt.len) {
LOG_ERR("space rcvd %d vs %d", rcvd_len, pckt.len);
return -EIO;
}
pckt.len = ESPI_OOB_REGS->RX_LEN;
pckt.len = rcvd_len;
memcpy(pckt.buf, slave_rx_mem, pckt.len);
return 0;