diff options
| author | David Lechner <dlechner@baylibre.com> | 2023-11-17 14:13:04 -0600 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2023-11-20 13:29:14 +0000 |
| commit | 145bb2aedb9f78f290c2b5503b553894a6ec53fe (patch) | |
| tree | 47b6807cb4aab6f03326dd5851b723306fc4bfcc /drivers/spi | |
| parent | 4e991445478c6404a6846928093837249c52694a (diff) | |
| download | linux-145bb2aedb9f78f290c2b5503b553894a6ec53fe.tar.gz | |
spi: axi-spi-engine: add support for cs_off
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>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/spi-axi-spi-engine.c | 31 |
1 files changed, 21 insertions, 10 deletions
diff --git a/drivers/spi/spi-axi-spi-engine.c b/drivers/spi/spi-axi-spi-engine.c index c39f478f34a71..1c60e6486ee24 100644 --- a/drivers/spi/spi-axi-spi-engine.c +++ b/drivers/spi/spi-axi-spi-engine.c @@ -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 (cs_change) - spi_engine_gen_cs(p, dry, spi, false); + 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 (!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; } |