[PATCH 7/9] spi: amd: Check for idle bus before execute opcode

[Lucas Tanure <tanureal@opensource.cirrus.com>]

Check if the bus is not in use before starting the transfer
Also wait after so the READ bytes in the FIFO are ready to
be copied

Signed-off-by: Lucas Tanure <tanureal@opensource.cirrus.com>
---
 drivers/spi/spi-amd.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-amd.c b/drivers/spi/spi-amd.c
index ebbc64a9fa7b..75390fcb0481 100644
--- a/drivers/spi/spi-amd.c
+++ b/drivers/spi/spi-amd.c
@@ -110,11 +110,17 @@ static int amd_spi_busy_wait(struct amd_spi *amd_spi)
 				 !(val & AMD_SPI_BUSY), 10, 100000);
 }
 
-static void amd_spi_execute_opcode(struct amd_spi *amd_spi)
+static int amd_spi_execute_opcode(struct amd_spi *amd_spi)
 {
+	int 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 amd_spi_busy_wait(amd_spi);
 }
 
 static int amd_spi_master_setup(struct spi_device *spi)
-- 
2.33.0