[PATCH 5.15.y 2/2] mfd: wcd934x: set DMA mask on parent to silence "DMA mask not set"

[Sasha Levin <sashal@kernel.org>]

From: David Heidelberg <david@ixit.cz>

[ Upstream commit b296be1dc008fe3a536341afae01f66bb302e67f ]

The wcd934x MFD parent (a slim_device) never initializes its
dma_mask/coherent_dma_mask. When the DT-aware children pass through
of_dma_configure() this triggers the "DMA mask not set" warning for
each child.

Cc: stable@vger.kernel.org
Fixes: f959dcd6ddfd ("dma-direct: Fix potential NULL pointer dereference")
Assisted-by: tencent:hy3
Signed-off-by: David Heidelberg <david@ixit.cz>
Link: https://patch.msgid.link/20260903-wcd-dma-v2-1-189cff560a28@ixit.cz
Signed-off-by: Lee Jones <lee@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/mfd/wcd934x.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/mfd/wcd934x.c b/drivers/mfd/wcd934x.c
index ac84d45a31ef9..8b83d600b365f 100644
--- a/drivers/mfd/wcd934x.c
+++ b/drivers/mfd/wcd934x.c
@@ -2,6 +2,7 @@
 // Copyright (c) 2019, Linaro Limited
 
 #include <linux/clk.h>
+#include <linux/dma-mapping.h>
 #include <linux/gpio/consumer.h>
 #include <linux/interrupt.h>
 #include <linux/kernel.h>
@@ -212,6 +213,11 @@ static int wcd934x_slim_probe(struct slim_device *sdev)
 	struct gpio_desc *reset_gpio;
 	int ret;
 
+	ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
+	if (ret)
+		return dev_err_probe(dev, ret,
+				     "Failed to set DMA mask\n");
+
 	ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
 	if (!ddata)
 		return	-ENOMEM;
-- 
2.53.0