[PATCH 07/10] spi: amd: Check for idle bus before execute opcode

From: Lucas Tanure <tanureal@opensource.cirrus.com>
To: Mark Brown <broonie@kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	"Rafael J . Wysocki" <rafael@kernel.org>,
	Sanjay R Mehta <sanju.mehta@amd.com>,
	Nehal Bakulchandra Shah <Nehal-Bakulchandra.shah@amd.com>
Cc: <linux-kernel@vger.kernel.org>, <linux-spi@vger.kernel.org>,
	<patches@opensource.cirrus.com>,
	Lucas Tanure <tanureal@opensource.cirrus.com>
Subject: [PATCH 07/10] spi: amd: Check for idle bus before execute opcode
Date: Wed, 8 Sep 2021 12:34:48 +0100	[thread overview]
Message-ID: <20210908113450.788452-8-tanureal@opensource.cirrus.com> (raw)
In-Reply-To: <20210908113450.788452-1-tanureal@opensource.cirrus.com>

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

Signed-off-by: Lucas Tanure <tanureal@opensource.cirrus.com>
---
 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

