[PATCH 4/4] spi: amd: Check for idle bus before execute opcode

From: Lucas Tanure
Date: Thu Sep 09 2021 - 07:10:21 EST


Check if the bus is not in use before starting the
transfer

Signed-off-by: Lucas Tanure <tanureal@xxxxxxxxxxxxxxxxxxxxx>
---
drivers/spi/spi-amd.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-amd.c b/drivers/spi/spi-amd.c
index 97838b57871c..99b2b0ccff08 100644
--- a/drivers/spi/spi-amd.c
+++ b/drivers/spi/spi-amd.c
@@ -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)
--
2.33.0