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spi: axi-spi-engine: add support for cs_off

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This adds support for the spi_transfer::cs_off flag to the AXI SPI
Engine driver.

The logic is copied from the generic spi_transfer_one_message() in
spi.c.

Signed-off-by: David Lechner <dlechner@baylibre.com>
Link: https://lore.kernel.org/r/20231117-axi-spi-engine-series-1-v1-13-cc59db999b87@baylibre.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
David Lechner 2023-11-17 14:13:04 -06:00 committed by Mark Brown
parent 4e99144547
commit 145bb2aedb
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 20 additions and 9 deletions
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29
drivers/spi/spi-axi-spi-engine.c
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@ -216,7 +216,7 @@ static int spi_engine_compile_message(struct spi_engine *spi_engine,
struct spi_device *spi = msg->spi;
struct spi_transfer *xfer;
int clk_div, new_clk_div;
bool cs_change = true;
bool keep_cs = false;
clk_div = -1;
@ -224,6 +224,9 @@ static int spi_engine_compile_message(struct spi_engine *spi_engine,
SPI_ENGINE_CMD_WRITE(SPI_ENGINE_CMD_REG_CONFIG,
spi_engine_get_config(spi)));
xfer = list_first_entry(&msg->transfers, struct spi_transfer, transfer_list);
spi_engine_gen_cs(p, dry, spi, !xfer->cs_off);
list_for_each_entry(xfer, &msg->transfers, transfer_list) {
new_clk_div = spi_engine_get_clk_div(spi_engine, spi, xfer);
if (new_clk_div != clk_div) {
@ -233,20 +236,28 @@ static int spi_engine_compile_message(struct spi_engine *spi_engine,
clk_div));
}
if (cs_change)
spi_engine_gen_cs(p, dry, spi, true);
spi_engine_gen_xfer(p, dry, xfer);
spi_engine_gen_sleep(p, dry, spi_engine, clk_div, xfer);
cs_change = xfer->cs_change;
if (list_is_last(&xfer->transfer_list, &msg->transfers))
cs_change = !cs_change;
if (xfer->cs_change) {
if (list_is_last(&xfer->transfer_list, &msg->transfers)) {
keep_cs = true;
} else {
if (!xfer->cs_off)
spi_engine_gen_cs(p, dry, spi, false);
if (cs_change)
spi_engine_gen_cs(p, dry, spi, false);
if (!list_next_entry(xfer, transfer_list)->cs_off)
spi_engine_gen_cs(p, dry, spi, true);
}
} else if (!list_is_last(&xfer->transfer_list, &msg->transfers) &&
xfer->cs_off != list_next_entry(xfer, transfer_list)->cs_off) {
spi_engine_gen_cs(p, dry, spi, xfer->cs_off);
}
}
if (!keep_cs)
spi_engine_gen_cs(p, dry, spi, false);
return 0;
}