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spi: ar934x: fix transfer size

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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>
This commit is contained in:
Oskari Lemmela 2021-12-22 07:59:57 +02:00 committed by Mark Brown
parent 12baee68b2
commit ebe33e5a98
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 11 additions and 5 deletions
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16
drivers/spi/spi-ar934x.c
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@ -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;