linux-kernel - [PATCH 2/2] spi: spi-mem: fallback to using transfers when CS gpios are used

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Date:   Thu,  7 Nov 2019 17:42:35 +1300
From:   Chris Packham <chris.packham@...iedtelesis.co.nz>
To:     broonie@...nel.org, kdasu.kdev@...il.com,
        bcm-kernel-feedback-list@...adcom.com
Cc:     linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Chris Packham <chris.packham@...iedtelesis.co.nz>
Subject: [PATCH 2/2] spi: spi-mem: fallback to using transfers when CS gpios are used

Devices with chip selects driven via GPIO are not compatible with the
spi-mem operations. Fallback to using standard spi transfers when the
device is connected with a gpio CS.

Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
---
 drivers/spi/spi-mem.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/spi/spi-mem.c b/drivers/spi/spi-mem.c
index 9f0fa9f3116d..e5a46f0eb93b 100644
--- a/drivers/spi/spi-mem.c
+++ b/drivers/spi/spi-mem.c
@@ -286,7 +286,7 @@ int spi_mem_exec_op(struct spi_mem *mem, const struct spi_mem_op *op)
 	if (!spi_mem_internal_supports_op(mem, op))
 		return -ENOTSUPP;
 
-	if (ctlr->mem_ops) {
+	if (ctlr->mem_ops && !mem->spi->cs_gpiod) {
 		ret = spi_mem_access_start(mem);
 		if (ret)
 			return ret;
-- 
2.24.0