diff options
| author | Mark Brown <broonie@kernel.org> | 2020-07-17 00:55:27 +0100 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2020-07-17 00:55:27 +0100 |
| commit | e752ec8e9216fd72bc2528297b7606071fb60d29 (patch) | |
| tree | a96120a327807620c6980523d607e1defb0fbee0 /drivers/spi | |
| parent | 499de01c5c0b813cc94dbfc722ec12487044ac4a (diff) | |
| parent | 5e94c3cdaa29e28f6739c91a74d9ddd96f4ba6b6 (diff) | |
| download | lwn-e752ec8e9216fd72bc2528297b7606071fb60d29.tar.gz lwn-e752ec8e9216fd72bc2528297b7606071fb60d29.zip | |
Merge series "spi: bcm2835/bcm2835aux: support effective_speed_hz" from Marc Kleine-Budde <mkl@pengutronix.de>:
Hello,
I've picked up and forward ported Martin Sperl's patches which add support for
effective_speed_hz to the SPI controllers found on all raspberry pi models.
See the following patch, which adds this feature to the SPI core, for more
information:
5d7e2b5ed585 spi: core: allow reporting the effectivly used speed_hz for a transfer
regards,
Marc
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Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/spi-bcm2835.c | 6 | ||||
| -rw-r--r-- | drivers/spi/spi-bcm2835aux.c | 6 |
2 files changed, 6 insertions, 6 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) diff --git a/drivers/spi/spi-bcm2835aux.c b/drivers/spi/spi-bcm2835aux.c index c331efd6e86b..2f717812c766 100644 --- a/drivers/spi/spi-bcm2835aux.c +++ b/drivers/spi/spi-bcm2835aux.c @@ -345,7 +345,7 @@ static int bcm2835aux_spi_transfer_one(struct spi_master *master, struct spi_transfer *tfr) { struct bcm2835aux_spi *bs = spi_master_get_devdata(master); - unsigned long spi_hz, clk_hz, speed, spi_used_hz; + unsigned long spi_hz, clk_hz, speed; unsigned long hz_per_byte, byte_limit; /* calculate the registers to handle @@ -374,7 +374,7 @@ static int bcm2835aux_spi_transfer_one(struct spi_master *master, /* set the new speed */ bs->cntl[0] |= speed << BCM2835_AUX_SPI_CNTL0_SPEED_SHIFT; - spi_used_hz = clk_hz / (2 * (speed + 1)); + tfr->effective_speed_hz = clk_hz / (2 * (speed + 1)); /* set transmit buffers and length */ bs->tx_buf = tfr->tx_buf; @@ -391,7 +391,7 @@ static int bcm2835aux_spi_transfer_one(struct spi_master *master, * 30 µs 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) |