Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-22 12:11:40 +00:00
Code Issues Packages Projects Releases Wiki Activity

spi: axi-spi-engine: populate xfer->effective_speed_hz

Browse Source 
This adds a new spi_engine_precompile_message() function to the ADI AXI
SPI Engine driver to populate the xfer->effective_speed_hz field since
the SPI core doesn't/can't do this for us.

This driver is already using spi_delay_to_ns() which depends on
effective_speed_hz to get an accurate value in some cases.
Having an effective_speed_hz value can also be used in future changes
to simplify other code.

Signed-off-by: David Lechner <dlechner@baylibre.com>
Acked-by: Michael Hennerich <michael.hennerich@analog.com>
Acked-by: Nuno Sa <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20231204-axi-spi-engine-series-2-v1-2-063672323fce@baylibre.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
David Lechner 2023-12-04 11:33:28 -06:00 committed by Mark Brown
parent 2e0d75f8dd
commit 9d023ecc31
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 23 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
drivers/spi/spi-axi-spi-engine.c
View File

@ -218,6 +218,27 @@ static void spi_engine_gen_cs(struct spi_engine_program *p, bool dry,
spi_engine_program_add_cmd(p, dry, SPI_ENGINE_CMD_ASSERT(1, mask));
}
/*
* Performs precompile steps on the message.
*
* The SPI core does most of the message/transfer validation and filling in
* fields for us via __spi_validate(). This fixes up anything remaining not
* done there.
*
* NB: This is separate from spi_engine_compile_message() because the latter
* is called twice and would otherwise result in double-evaluation.
*/
static void spi_engine_precompile_message(struct spi_message *msg)
{
unsigned int clk_div, max_hz = msg->spi->controller->max_speed_hz;
struct spi_transfer *xfer;
list_for_each_entry(xfer, &msg->transfers, transfer_list) {
clk_div = DIV_ROUND_UP(max_hz, xfer->speed_hz);
xfer->effective_speed_hz = max_hz / min(clk_div, 256U);
}
}
static void spi_engine_compile_message(struct spi_engine *spi_engine,
struct spi_message *msg, bool dry, struct spi_engine_program *p)
{
@ -504,6 +525,8 @@ static int spi_engine_prepare_message(struct spi_controller *host,
if (!st)
return -ENOMEM;
spi_engine_precompile_message(msg);
p_dry.length = 0;
spi_engine_compile_message(spi_engine, msg, true, &p_dry);