[U-Boot] [PATCH v3 05/20] spi: spi-mem: Claim SPI bus before spi mem access

[Vignesh R]

It is necessary to call spi_claim_bus() before starting any SPI
transactions and this restriction would also apply when calling spi-mem
operations. Therefore claim and release bus before requesting transfer
via exec_op.

Signed-off-by: Vignesh R <vigneshr at ti.com>
Tested-by: Simon Goldschmidt <simon.k.r.goldschmidt at gmail.com>
Tested-by: Stefan Roese <sr at denx.de>
Tested-by: Horatiu Vultur <horatiu.vultur at microchip.com>
---
 drivers/spi/spi-mem.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/spi/spi-mem.c b/drivers/spi/spi-mem.c
index 334af682dc65..1bb0987edb72 100644
--- a/drivers/spi/spi-mem.c
+++ b/drivers/spi/spi-mem.c
@@ -210,6 +210,10 @@ int spi_mem_exec_op(struct spi_slave *slave, const struct spi_mem_op *op)
 	if (!spi_mem_supports_op(slave, op))
 		return -ENOTSUPP;
 
+	ret = spi_claim_bus(slave);
+	if (ret < 0)
+		return ret;
+
 	if (ops->mem_ops) {
 #ifndef __UBOOT__
 		/*
@@ -232,6 +236,7 @@ int spi_mem_exec_op(struct spi_slave *slave, const struct spi_mem_op *op)
 		mutex_lock(&ctlr->io_mutex);
 #endif
 		ret = ops->mem_ops->exec_op(slave, op);
+
 #ifndef __UBOOT__
 		mutex_unlock(&ctlr->io_mutex);
 		mutex_unlock(&ctlr->bus_lock_mutex);
@@ -245,8 +250,10 @@ int spi_mem_exec_op(struct spi_slave *slave, const struct spi_mem_op *op)
 		 * read path) and expect the core to use the regular SPI
 		 * interface in other cases.
 		 */
-		if (!ret || ret != -ENOTSUPP)
+		if (!ret || ret != -ENOTSUPP) {
+			spi_release_bus(slave);
 			return ret;
+		}
 	}
 
 #ifndef __UBOOT__
@@ -333,10 +340,6 @@ int spi_mem_exec_op(struct spi_slave *slave, const struct spi_mem_op *op)
 	op_len = sizeof(op->cmd.opcode) + op->addr.nbytes + op->dummy.nbytes;
 	op_buf = calloc(1, op_len);
 
-	ret = spi_claim_bus(slave);
-	if (ret < 0)
-		return ret;
-
 	op_buf[pos++] = op->cmd.opcode;
 
 	if (op->addr.nbytes) {
-- 
2.20.1