linux-kernel - [PATCH AUTOSEL 5.4 1/3] spi: imx: Don't expect DMA for i.MX{25,35,50,51,53} cspi devices

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Message-ID: <20240716183459.2814875-1-sashal@kernel.org>
Date: Tue, 16 Jul 2024 14:34:53 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
	Mark Brown <broonie@...nel.org>,
	Sasha Levin <sashal@...nel.org>,
	shawnguo@...nel.org,
	linux-spi@...r.kernel.org,
	imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org
Subject: [PATCH AUTOSEL 5.4 1/3] spi: imx: Don't expect DMA for i.MX{25,35,50,51,53} cspi devices

From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>

[ Upstream commit ce1dac560a74220f2e53845ec0723b562288aed4 ]

While in commit 2dd33f9cec90 ("spi: imx: support DMA for imx35") it was
claimed that DMA works on i.MX25, i.MX31 and i.MX35 the respective
device trees don't add DMA channels. The Reference manuals of i.MX31 and
i.MX25 also don't mention the CSPI core being DMA capable. (I didn't
check the others.)

Since commit e267a5b3ec59 ("spi: spi-imx: Use dev_err_probe for failed
DMA channel requests") this results in an error message

	spi_imx 43fa4000.spi: error -ENODEV: can't get the TX DMA channel!

during boot. However that isn't fatal and the driver gets loaded just
fine, just without using DMA.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Link: https://patch.msgid.link/20240508095610.2146640-2-u.kleine-koenig@pengutronix.de
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/spi/spi-imx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
index 67f31183c1180..8c9bafee58f9f 100644
--- a/drivers/spi/spi-imx.c
+++ b/drivers/spi/spi-imx.c
@@ -993,7 +993,7 @@ static struct spi_imx_devtype_data imx35_cspi_devtype_data = {
 	.rx_available = mx31_rx_available,
 	.reset = mx31_reset,
 	.fifo_size = 8,
-	.has_dmamode = true,
+	.has_dmamode = false,
 	.dynamic_burst = false,
 	.has_slavemode = false,
 	.devtype = IMX35_CSPI,
-- 
2.43.0