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drivers: bluetooth: hci_ambiq: add necessary SPI CS control

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Before sending packet to controller the host needs to poll the status of
controller to know it's ready, or before reading packets from controller
the host needs to get the payload size of coming packets by sending
specific command and putting the status or size to the rx buffer, the CS
should be held at this moment to continue to send or receive packets.
This change is needed for the based SPI driver update.

Signed-off-by: Aaron Ye <aye@ambiq.com>
This commit is contained in:
Aaron Ye 2024-05-30 17:40:18 +08:00 • committed by Henrik Brix Andersen
commit 30c41e9559
1 changed files with 12 additions and 0 deletions
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12
drivers/bluetooth/hci/hci_ambiq.c
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@ -85,6 +85,18 @@ static inline int bt_spi_transceive(void *tx, uint32_t tx_len, void *rx, uint32_
spi_tx_buf.len = (size_t)tx_len;
spi_rx_buf.buf = rx;
spi_rx_buf.len = (size_t)rx_len;
/* Before sending packet to controller the host needs to poll the status of
* controller to know it's ready, or before reading packets from controller
* the host needs to get the payload size of coming packets by sending specific
* command and putting the status or size to the rx buffer, the CS should be
* held at this moment to continue to send or receive packets.
*/
if (tx_len && rx_len) {
spi_cfg.operation |= SPI_HOLD_ON_CS;
} else {
spi_cfg.operation &= ~SPI_HOLD_ON_CS;
}
return spi_transceive(spi_dev, &spi_cfg, &spi_tx, &spi_rx);
}