FAILED: patch "[PATCH] mfd: wcd934x: set DMA mask on parent to silence "DMA mask not set"" failed to apply to 5.15-stable tree

FAILED: patch "[PATCH] mfd: wcd934x: set DMA mask on parent to silence "DMA mask not set"" failed to apply to 5.15-stable tree

[Sasha Levin]

The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x b296be1dc008fe3a536341afae01f66bb302e67f
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '20261107060004-failed-5.15-b296be1dc008@kernel.org' --subject-prefix 'PATCH 5.15.y' 'HEAD^..'

Thanks,
Sasha

------------------ original commit in Linus's tree ------------------

From b296be1dc008fe3a536341afae01f66bb302e67f Mon Sep 17 00:00:00 2001
From: David Heidelberg <david@ixit.cz>
Date: Thu, 3 Sep 2026 16:42:05 +0200
Subject: [PATCH] mfd: wcd934x: set DMA mask on parent to silence "DMA mask not
 set"

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>
---
 drivers/mfd/wcd934x.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/mfd/wcd934x.c b/drivers/mfd/wcd934x.c
index 3c3080e8c8cf7..7bea64fc09562 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>
@@ -217,6 +218,11 @@ 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

[PATCH 5.15.y 1/2] mfd: wcd934x: Replace legacy gpio interface for gpiod

[Sasha Levin]

From: Maíra Canal <maira.canal@usp.br>

[ Upstream commit 6a0ee2a61a31cae2ea0a86a4401d6a70a0be3be4 ]

Considering the current transition of the GPIO subsystem, remove all
dependencies of the legacy GPIO interface (linux/gpio.h and linux
/of_gpio.h) and replace it with the descriptor-based GPIO approach.

Signed-off-by: Maíra Canal <maira.canal@usp.br>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/YXDEBCiSnXYRQPXt@fedora
Stable-dep-of: b296be1dc008 ("mfd: wcd934x: set DMA mask on parent to silence "DMA mask not set"")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/mfd/wcd934x.c | 21 +++++++++------------
 1 file changed, 9 insertions(+), 12 deletions(-)

diff --git a/drivers/mfd/wcd934x.c b/drivers/mfd/wcd934x.c
index 91584d408c7a1..ac84d45a31ef9 100644
--- a/drivers/mfd/wcd934x.c
+++ b/drivers/mfd/wcd934x.c
@@ -2,14 +2,13 @@
 // Copyright (c) 2019, Linaro Limited
 
 #include <linux/clk.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/interrupt.h>
 #include <linux/kernel.h>
 #include <linux/mfd/core.h>
 #include <linux/mfd/wcd934x/registers.h>
 #include <linux/mfd/wcd934x/wcd934x.h>
 #include <linux/module.h>
-#include <linux/of_gpio.h>
 #include <linux/of.h>
 #include <linux/of_irq.h>
 #include <linux/platform_device.h>
@@ -210,7 +209,8 @@ static int wcd934x_slim_probe(struct slim_device *sdev)
 	struct device *dev = &sdev->dev;
 	struct device_node *np = dev->of_node;
 	struct wcd934x_ddata *ddata;
-	int reset_gpio, ret;
+	struct gpio_desc *reset_gpio;
+	int ret;
 
 	ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
 	if (!ddata)
@@ -221,13 +221,6 @@ static int wcd934x_slim_probe(struct slim_device *sdev)
 		return dev_err_probe(dev, ddata->irq,
 				     "Failed to get IRQ\n");
 
-	reset_gpio = of_get_named_gpio(np, "reset-gpios", 0);
-	if (reset_gpio < 0) {
-		dev_err(dev, "Failed to get reset gpio: err = %d\n",
-			reset_gpio);
-		return reset_gpio;
-	}
-
 	ddata->extclk = devm_clk_get(dev, "extclk");
 	if (IS_ERR(ddata->extclk)) {
 		dev_err(dev, "Failed to get extclk");
@@ -258,9 +251,13 @@ static int wcd934x_slim_probe(struct slim_device *sdev)
 	 * SYS_RST_N shouldn't be pulled high during this time
 	 */
 	usleep_range(600, 650);
-	gpio_direction_output(reset_gpio, 0);
+	reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
+	if (IS_ERR(reset_gpio)) {
+		return dev_err_probe(dev, PTR_ERR(reset_gpio),
+				"Failed to get reset gpio: err = %ld\n", PTR_ERR(reset_gpio));
+	}
 	msleep(20);
-	gpio_set_value(reset_gpio, 1);
+	gpiod_set_value(reset_gpio, 1);
 	msleep(20);
 
 	ddata->dev = dev;
-- 
2.53.0

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

[Sasha Levin]

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