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| author | Martin Sperl <kernel@martin.sperl.org> | 2020-07-09 09:41:19 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2020-07-17 01:30:44 +0200 |
| commit | 9df2003df79a0f763dbf76891fcc7d4a5141861d (patch) | |
| tree | 034d975a4e0d1aaccd077065b482db4d46bab409 /drivers/spi/spi-bcm2835.c | |
| parent | spi: omap-uwire: Use clk_prepare_enable and clk_disable_unprepare (diff) | |
| download | linux-9df2003df79a0f763dbf76891fcc7d4a5141861d.tar.xz linux-9df2003df79a0f763dbf76891fcc7d4a5141861d.zip | |
spi: bcm2835: support effective_speed_hz
Setting spi_transfer->effective_speed_hz in transfer_one so that
it can get used in cs_change_delay configured with delay as a muliple
of SPI clock cycles.
Signed-off-by: Martin Sperl <kernel@martin.sperl.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Link: https://lore.kernel.org/r/20200709074120.110069-2-mkl@pengutronix.de
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi-bcm2835.c')
| -rw-r--r-- | drivers/spi/spi-bcm2835.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/spi/spi-bcm2835.c b/drivers/spi/spi-bcm2835.c index e9a91adf03eb..c45d76c848c8 100644 --- a/drivers/spi/spi-bcm2835.c +++ b/drivers/spi/spi-bcm2835.c @@ -1082,7 +1082,7 @@ static int bcm2835_spi_transfer_one(struct spi_controller *ctlr, struct spi_transfer *tfr) { struct bcm2835_spi *bs = spi_controller_get_devdata(ctlr); - unsigned long spi_hz, clk_hz, cdiv, spi_used_hz; + unsigned long spi_hz, clk_hz, cdiv; unsigned long hz_per_byte, byte_limit; u32 cs = bs->prepare_cs[spi->chip_select]; @@ -1102,7 +1102,7 @@ static int bcm2835_spi_transfer_one(struct spi_controller *ctlr, } else { cdiv = 0; /* 0 is the slowest we can go */ } - spi_used_hz = cdiv ? (clk_hz / cdiv) : (clk_hz / 65536); + tfr->effective_speed_hz = cdiv ? (clk_hz / cdiv) : (clk_hz / 65536); bcm2835_wr(bs, BCM2835_SPI_CLK, cdiv); /* handle all the 3-wire mode */ @@ -1122,7 +1122,7 @@ static int bcm2835_spi_transfer_one(struct spi_controller *ctlr, * per 300,000 Hz of bus clock. */ hz_per_byte = polling_limit_us ? (9 * 1000000) / polling_limit_us : 0; - byte_limit = hz_per_byte ? spi_used_hz / hz_per_byte : 1; + byte_limit = hz_per_byte ? tfr->effective_speed_hz / hz_per_byte : 1; /* run in polling mode for short transfers */ if (tfr->len < byte_limit) |