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| author | Oskari Lemmela <oskari@lemmela.net> | 2021-12-22 07:59:57 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2022-01-04 14:59:40 +0000 |
| commit | ebe33e5a98dcf14a9630845f3f10c193584ac054 (patch) | |
| tree | 690957be405863d94bc34f33514a3c932355ebd0 /drivers/spi | |
| parent | 12baee68b2df6847f9a26ee82f30aa5f52c6d0d2 (diff) | |
| download | linux-ebe33e5a98dcf14a9630845f3f10c193584ac054.tar.gz linux-ebe33e5a98dcf14a9630845f3f10c193584ac054.tar.bz2 linux-ebe33e5a98dcf14a9630845f3f10c193584ac054.zip | |
spi: ar934x: fix transfer size
If bits_per_word is configured, transfer only word amount
of data per iteration.
Signed-off-by: Oskari Lemmela <oskari@lemmela.net>
Link: https://lore.kernel.org/r/20211222055958.1383233-2-oskari@lemmela.net
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/spi-ar934x.c | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/drivers/spi/spi-ar934x.c b/drivers/spi/spi-ar934x.c index e1b64e35900c..ec7250c4c810 100644 --- a/drivers/spi/spi-ar934x.c +++ b/drivers/spi/spi-ar934x.c @@ -82,7 +82,7 @@ static int ar934x_spi_transfer_one_message(struct spi_controller *master, struct spi_device *spi = m->spi; unsigned long trx_done, trx_cur; int stat = 0; - u8 term = 0; + u8 bpw, term = 0; int div, i; u32 reg; const u8 *tx_buf; @@ -90,6 +90,11 @@ static int ar934x_spi_transfer_one_message(struct spi_controller *master, m->actual_length = 0; list_for_each_entry(t, &m->transfers, transfer_list) { + if (t->bits_per_word >= 8 && t->bits_per_word < 32) + bpw = t->bits_per_word >> 3; + else + bpw = 4; + if (t->speed_hz) div = ar934x_spi_clk_div(sp, t->speed_hz); else @@ -105,10 +110,10 @@ static int ar934x_spi_transfer_one_message(struct spi_controller *master, iowrite32(reg, sp->base + AR934X_SPI_REG_CTRL); iowrite32(0, sp->base + AR934X_SPI_DATAOUT); - for (trx_done = 0; trx_done < t->len; trx_done += 4) { + for (trx_done = 0; trx_done < t->len; trx_done += bpw) { trx_cur = t->len - trx_done; - if (trx_cur > 4) - trx_cur = 4; + if (trx_cur > bpw) + trx_cur = bpw; else if (list_is_last(&t->transfer_list, &m->transfers)) term = 1; @@ -193,7 +198,8 @@ static int ar934x_spi_probe(struct platform_device *pdev) ctlr->mode_bits = SPI_LSB_FIRST; ctlr->setup = ar934x_spi_setup; ctlr->transfer_one_message = ar934x_spi_transfer_one_message; - ctlr->bits_per_word_mask = SPI_BPW_MASK(8); + ctlr->bits_per_word_mask = SPI_BPW_MASK(32) | SPI_BPW_MASK(24) | + SPI_BPW_MASK(16) | SPI_BPW_MASK(8); ctlr->dev.of_node = pdev->dev.of_node; ctlr->num_chipselect = 3; |