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try to keep CS up when a next message is coming #16

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11 changes: 10 additions & 1 deletion ch341-spi.c
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Original file line number Diff line number Diff line change
Expand Up @@ -157,6 +157,8 @@ static int ch341_spi_transfer_one_message(struct spi_master *master,
unsigned int tx_len = 0;
unsigned int buf_idx = 0;
int status;
struct spi_transfer *last_xfer;
struct spi_message *next_msg;

if (spi->mode & SPI_NO_CS) {
cs = NULL;
Expand All @@ -176,7 +178,14 @@ static int ch341_spi_transfer_one_message(struct spi_master *master,
}

status = spi_transfer(dev, client->buf, buf_idx, buf_idx - tx_len);
if (cs) {

last_xfer = list_last_entry(&m->transfers,
struct spi_transfer, transfer_list);
next_msg = spi_get_next_queued_message(master);
if (next_msg && next_msg->spi != m->spi)
next_msg = NULL;

if (cs && !last_xfer->cs_change && next_msg) {
if (spi->mode & SPI_CS_HIGH)
gpiod_set_value_cansleep(cs, 0);
else
Expand Down