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spi: dw: send cmd and addr to start the spi transfer

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In enhanced spi mode, read or write will start by sending the cmd
and address (if present).

Signed-off-by: Sudip Mukherjee <sudip.mukherjee@sifive.com>
Co-developed-by: Changhuang Liang <changhuang.liang@starfivetech.com>
Signed-off-by: Changhuang Liang <changhuang.liang@starfivetech.com>
Link: https://patch.msgid.link/20260803124044.156998-8-changhuang.liang@starfivetech.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Sudip Mukherjee 2026-08-03 05:40:40 -07:00 committed by Mark Brown
parent 4cd882e1da
commit 51119176c2
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GPG Key ID: 24D68B725D5487D0
1 changed files with 15 additions and 0 deletions
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15
drivers/spi/spi-dw-core.c
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@ -849,6 +849,19 @@ static void dw_spi_init_enh_mem_buf(struct dw_spi *dws, const struct spi_mem_op
}
}
static void dw_spi_enh_write_cmd_addr(struct dw_spi *dws, const struct spi_mem_op *op)
{
/* Send cmd as 32 bit value */
dw_write_io_reg(dws, DW_SPI_DR, op->cmd.opcode);
if (op->addr.nbytes) {
dw_write_io_reg(dws, DW_SPI_DR, lower_32_bits(op->addr.val));
if (op->addr.nbytes > 4) {
/* address more than 32bit */
dw_write_io_reg(dws, DW_SPI_DR, upper_32_bits(op->addr.val));
}
}
}
static int dw_spi_exec_enh_mem_op(struct spi_mem *mem, const struct spi_mem_op *op)
{
struct spi_controller *ctlr = mem->spi->controller;
@ -909,6 +922,8 @@ static int dw_spi_exec_enh_mem_op(struct spi_mem *mem, const struct spi_mem_op *
dw_spi_enable_chip(dws, 1);
dw_spi_enh_write_cmd_addr(dws, op);
return 0;
}