mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-09-27 12:57:53 +00:00
Code Issues Releases Wiki Activity

spi: bcm63xx-hsspi: Fix multi-bit mode setting

Browse source 
[ Upstream commit 811ff802aa ]

Currently the driver always sets the controller to dual data bit mode
for both tx and rx data in the profile mode control register even for
single data bit transfer. Luckily the opcode is set correctly according
to SPI transfer data bit width so it does not actually cause issues.

This change fixes the problem by setting tx and rx data bit mode field
correctly according to the actual SPI transfer tx and rx data bit width.

Fixes: 142168eba9 ("spi: bcm63xx-hsspi: add bcm63xx HSSPI driver")
Signed-off-by: William Zhang <william.zhang@broadcom.com>
Link: https://lore.kernel.org/r/20230209200246.141520-11-william.zhang@broadcom.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
William Zhang 2023-02-09 12:02:41 -08:00 committed by Greg Kroah-Hartman
parent caed289f95
commit 5281816466
1 changed files with 9 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

12
drivers/spi/spi-bcm63xx-hsspi.c
View file

@ -163,6 +163,7 @@ static int bcm63xx_hsspi_do_txrx(struct spi_device *spi, struct spi_transfer *t)
int step_size = HSSPI_BUFFER_LEN;
const u8 *tx = t->tx_buf;
u8 *rx = t->rx_buf;
u32 val = 0;
bcm63xx_hsspi_set_clk(bs, spi, t->speed_hz);
bcm63xx_hsspi_set_cs(bs, spi->chip_select, true);
@ -178,11 +179,16 @@ static int bcm63xx_hsspi_do_txrx(struct spi_device *spi, struct spi_transfer *t)
step_size -= HSSPI_OPCODE_LEN;
if ((opcode == HSSPI_OP_READ && t->rx_nbits == SPI_NBITS_DUAL) ||
(opcode == HSSPI_OP_WRITE && t->tx_nbits == SPI_NBITS_DUAL))
(opcode == HSSPI_OP_WRITE && t->tx_nbits == SPI_NBITS_DUAL)) {
opcode |= HSSPI_OP_MULTIBIT;
__raw_writel(1 << MODE_CTRL_MULTIDATA_WR_SIZE_SHIFT |
1 << MODE_CTRL_MULTIDATA_RD_SIZE_SHIFT | 0xff,
if (t->rx_nbits == SPI_NBITS_DUAL)
val |= 1 << MODE_CTRL_MULTIDATA_RD_SIZE_SHIFT;
if (t->tx_nbits == SPI_NBITS_DUAL)
val |= 1 << MODE_CTRL_MULTIDATA_WR_SIZE_SHIFT;
}
__raw_writel(val | 0xff,
bs->regs + HSSPI_PROFILE_MODE_CTRL_REG(chip_select));
while (pending > 0) {