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spi: amd: Don't wait for a write-only transfer to finish

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Return from a write-only transfer without waiting for
it to finish
But wait before a new transfer as the previous may
still happening and also wait before reading the data
from the FIFO

Signed-off-by: Lucas Tanure <tanureal@opensource.cirrus.com>
Reviewed-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20210910111529.12539-4-tanureal@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Lucas Tanure 2021-09-10 12:15:29 +01:00 committed by Mark Brown
parent 3b02d2890b
commit 777a2cbbaf
No known key found for this signature in database
GPG key ID: 24D68B725D5487D0
1 changed files with 10 additions and 2 deletions
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12
drivers/spi/spi-amd.c
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@ -115,11 +115,18 @@ static int amd_spi_busy_wait(struct amd_spi *amd_spi)
return 0;
}
static void amd_spi_execute_opcode(struct amd_spi *amd_spi)
static int amd_spi_execute_opcode(struct amd_spi *amd_spi)
{
int ret;
ret = amd_spi_busy_wait(amd_spi);
if (ret)
return ret;
/* Set ExecuteOpCode bit in the CTRL0 register */
amd_spi_setclear_reg32(amd_spi, AMD_SPI_CTRL0_REG, AMD_SPI_EXEC_CMD, AMD_SPI_EXEC_CMD);
amd_spi_busy_wait(amd_spi);
return 0;
}
static int amd_spi_master_setup(struct spi_device *spi)
@ -178,6 +185,7 @@ static inline int amd_spi_fifo_xfer(struct amd_spi *amd_spi,
amd_spi_clear_fifo_ptr(amd_spi);
/* Execute command */
amd_spi_execute_opcode(amd_spi);
amd_spi_busy_wait(amd_spi);
/* Read data from FIFO to receive buffer */
for (i = 0; i < rx_len; i++)
buf[i] = amd_spi_readreg8(amd_spi, AMD_SPI_FIFO_BASE + tx_len + i);