[PATCH v5 0/4] mailbox: imx: bug fix and add support for imx v1 mu

[PATCH v5 0/4] mailbox: imx: bug fix and add support for imx v1 mu

[Richard Zhu]

Change logs:
v4 --> v5:
  - Include Daniel's patch-set into this one.

v3 --> v4:
  - Change "version1.0" to "version 1.0" in the commit log.
  - Update the devicetree binding document to support the imx7ulp mu.
  - Rebase the patch refer to the following bug-fixs patch-set issued
  by Daniel Baluta <daniel.baluta@gmail.com>.
  "https://patchwork.kernel.org/patch/11069479/"

v2 --> v3:
  - Format the patch-set refer to Oleksij's guidance.
  - Init the register array by a simple way recommended by Oleksij.
  - Add Reviewed-by: Oleksij Rempel <o.rempel@pengutronix.de> tag.

v1 --> v2:
  - Use to have the register layout linked on probe, suggested by
  Oleksij Rempel <o.rempel@pengutronix.de>.
  - Add Reviewed-by: Dong Aisheng <aisheng.dong@nxp.com> tag.

Richard Zhu (4):
  mailbox: imx: Fix Tx doorbell shutdown path
  mailbox: imx: Clear the right interrupts at shutdown
  dt-bindings: mailbox: imx-mu: add imx7ulp MU support
  mailbox: imx: add support for imx v1 mu

 .../devicetree/bindings/mailbox/fsl,mu.txt         |  2 +
 drivers/mailbox/imx-mailbox.c                      | 74 ++++++++++++++++------
 2 files changed, 56 insertions(+), 20 deletions(-)

-- 
2.7.4

[PATCH v5 1/4] mailbox: imx: Fix Tx doorbell shutdown path

[Richard Zhu]

Tx doorbell is handled by txdb_tasklet and doesn't
have an associated IRQ.

Anyhow, imx_mu_shutdown ignores this and tries to
free an IRQ that wasn't requested for Tx DB resulting
in the following warning:

[    1.967644] Trying to free already-free IRQ 26
[    1.972108] WARNING: CPU: 2 PID: 157 at kernel/irq/manage.c:1708 __free_irq+0xc0/0x358
[    1.980024] Modules linked in:
[    1.983088] CPU: 2 PID: 157 Comm: kworker/2:1 Tainted: G
[    1.993524] Hardware name: Freescale i.MX8QXP MEK (DT)
[    1.998668] Workqueue: events deferred_probe_work_func
[    2.003812] pstate: 60000085 (nZCv daIf -PAN -UAO)
[    2.008607] pc : __free_irq+0xc0/0x358
[    2.012364] lr : __free_irq+0xc0/0x358
[    2.016111] sp : ffff00001179b7e0
[    2.019422] x29: ffff00001179b7e0 x28: 0000000000000018
[    2.024736] x27: ffff000011233000 x26: 0000000000000004
[    2.030053] x25: 000000000000001a x24: ffff80083bec74d4
[    2.035369] x23: 0000000000000000 x22: ffff80083bec7588
[    2.040686] x21: ffff80083b1fe8d8 x20: ffff80083bec7400
[    2.046003] x19: 0000000000000000 x18: ffffffffffffffff
[    2.051320] x17: 0000000000000000 x16: 0000000000000000
[    2.056637] x15: ffff0000111296c8 x14: ffff00009179b517
[    2.061953] x13: ffff00001179b525 x12: ffff000011142000
[    2.067270] x11: ffff000011129f20 x10: ffff0000105da970
[    2.072587] x9 : 00000000ffffffd0 x8 : 0000000000000194
[    2.077903] x7 : 612065657266206f x6 : ffff0000111e7b09
[    2.083220] x5 : 0000000000000003 x4 : 0000000000000000
[    2.088537] x3 : 0000000000000000 x2 : 00000000ffffffff
[    2.093854] x1 : 28b70f0a2b60a500 x0 : 0000000000000000
[    2.099173] Call trace:
[    2.101618]  __free_irq+0xc0/0x358
[    2.105021]  free_irq+0x38/0x98
[    2.108170]  imx_mu_shutdown+0x90/0xb0
[    2.111921]  mbox_free_channel.part.2+0x24/0xb8
[    2.116453]  mbox_free_channel+0x18/0x28

This bug is present from the beginning of times.

Cc: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>
Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
---
 drivers/mailbox/imx-mailbox.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/mailbox/imx-mailbox.c b/drivers/mailbox/imx-mailbox.c
index 25be8bb..1eeabc5 100644
--- a/drivers/mailbox/imx-mailbox.c
+++ b/drivers/mailbox/imx-mailbox.c
@@ -214,8 +214,10 @@ static void imx_mu_shutdown(struct mbox_chan *chan)
 	struct imx_mu_priv *priv = to_imx_mu_priv(chan->mbox);
 	struct imx_mu_con_priv *cp = chan->con_priv;
 
-	if (cp->type == IMX_MU_TYPE_TXDB)
+	if (cp->type == IMX_MU_TYPE_TXDB) {
 		tasklet_kill(&cp->txdb_tasklet);
+		return;
+	}
 
 	imx_mu_xcr_rmw(priv, 0,
 		   IMX_MU_xCR_TIEn(cp->idx) | IMX_MU_xCR_RIEn(cp->idx));
-- 
2.7.4

[PATCH v5 2/4] mailbox: imx: Clear the right interrupts at shutdown

[Richard Zhu]

Make sure to only clear enabled interrupts keeping count
of the connection type.

Suggested-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>
Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
---
 drivers/mailbox/imx-mailbox.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/mailbox/imx-mailbox.c b/drivers/mailbox/imx-mailbox.c
index 1eeabc5..afe625e 100644
--- a/drivers/mailbox/imx-mailbox.c
+++ b/drivers/mailbox/imx-mailbox.c
@@ -219,8 +219,19 @@ static void imx_mu_shutdown(struct mbox_chan *chan)
 		return;
 	}
 
-	imx_mu_xcr_rmw(priv, 0,
-		   IMX_MU_xCR_TIEn(cp->idx) | IMX_MU_xCR_RIEn(cp->idx));
+	switch (cp->type) {
+	case IMX_MU_TYPE_TX:
+		imx_mu_xcr_rmw(priv, 0, IMX_MU_xCR_TIEn(cp->idx));
+		break;
+	case IMX_MU_TYPE_RX:
+		imx_mu_xcr_rmw(priv, 0, IMX_MU_xCR_RIEn(cp->idx));
+		break;
+	case IMX_MU_TYPE_RXDB:
+		imx_mu_xcr_rmw(priv, 0, IMX_MU_xCR_GIEn(cp->idx));
+		break;
+	default:
+		break;
+	}
 
 	free_irq(priv->irq, chan);
 }
-- 
2.7.4

[PATCH v5 3/4] dt-bindings: mailbox: imx-mu: add imx7ulp MU support

[Richard Zhu]

There is a version 1.0 MU on imx7ulp, use "fsl,imx7ulp-mu" compatible
to support it.

Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
---
 Documentation/devicetree/bindings/mailbox/fsl,mu.txt | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/mailbox/fsl,mu.txt b/Documentation/devicetree/bindings/mailbox/fsl,mu.txt
index f3cf77e..9c43357 100644
--- a/Documentation/devicetree/bindings/mailbox/fsl,mu.txt
+++ b/Documentation/devicetree/bindings/mailbox/fsl,mu.txt
@@ -21,6 +21,8 @@ Required properties:
 		imx6sx, imx7s, imx8qxp, imx8qm.
 		The "fsl,imx6sx-mu" compatible is seen as generic and should
 		be included together with SoC specific compatible.
+		There is a version 1.0 MU on imx7ulp, use "fsl,imx7ulp-mu"
+		compatible to support it.
 - reg :		Should contain the registers location and length
 - interrupts :	Interrupt number. The interrupt specifier format depends
 		on the interrupt controller parent.
-- 
2.7.4

[PATCH v5 4/4] mailbox: imx: add support for imx v1 mu

[Richard Zhu]

There is a version 1.0 MU on i.MX7ULP platform.
One new version ID register is added, and it's offset is 0.
TRn registers are defined at the offset 0x20 ~ 0x2C.
RRn registers are defined at the offset 0x40 ~ 0x4C.
SR/CR registers are defined at 0x60/0x64.
Extend this driver to support it.

Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
Suggested-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Dong Aisheng <aisheng.dong@nxp.com>
Reviewed-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
 drivers/mailbox/imx-mailbox.c | 55 ++++++++++++++++++++++++++++++-------------
 1 file changed, 38 insertions(+), 17 deletions(-)

diff --git a/drivers/mailbox/imx-mailbox.c b/drivers/mailbox/imx-mailbox.c
index afe625e..2cdcdc5 100644
--- a/drivers/mailbox/imx-mailbox.c
+++ b/drivers/mailbox/imx-mailbox.c
@@ -12,19 +12,11 @@
 #include <linux/of_device.h>
 #include <linux/slab.h>
 
-/* Transmit Register */
-#define IMX_MU_xTRn(x)		(0x00 + 4 * (x))
-/* Receive Register */
-#define IMX_MU_xRRn(x)		(0x10 + 4 * (x))
-/* Status Register */
-#define IMX_MU_xSR		0x20
 #define IMX_MU_xSR_GIPn(x)	BIT(28 + (3 - (x)))
 #define IMX_MU_xSR_RFn(x)	BIT(24 + (3 - (x)))
 #define IMX_MU_xSR_TEn(x)	BIT(20 + (3 - (x)))
 #define IMX_MU_xSR_BRDIP	BIT(9)
 
-/* Control Register */
-#define IMX_MU_xCR		0x24
 /* General Purpose Interrupt Enable */
 #define IMX_MU_xCR_GIEn(x)	BIT(28 + (3 - (x)))
 /* Receive Interrupt Enable */
@@ -44,6 +36,13 @@ enum imx_mu_chan_type {
 	IMX_MU_TYPE_RXDB,	/* Rx doorbell */
 };
 
+struct imx_mu_dcfg {
+	u32	xTR[4];		/* Transmit Registers */
+	u32	xRR[4];		/* Receive Registers */
+	u32	xSR;		/* Status Register */
+	u32	xCR;		/* Control Register */
+};
+
 struct imx_mu_con_priv {
 	unsigned int		idx;
 	char			irq_desc[IMX_MU_CHAN_NAME_SIZE];
@@ -61,12 +60,27 @@ struct imx_mu_priv {
 	struct mbox_chan	mbox_chans[IMX_MU_CHANS];
 
 	struct imx_mu_con_priv  con_priv[IMX_MU_CHANS];
+	const struct imx_mu_dcfg	*dcfg;
 	struct clk		*clk;
 	int			irq;
 
 	bool			side_b;
 };
 
+static const struct imx_mu_dcfg imx_mu_cfg_imx6sx = {
+	.xTR	= {0x0, 0x4, 0x8, 0xc},
+	.xRR	= {0x10, 0x14, 0x18, 0x1c},
+	.xSR	= 0x20,
+	.xCR	= 0x24,
+};
+
+static const struct imx_mu_dcfg imx_mu_cfg_imx7ulp = {
+	.xTR	= {0x20, 0x24, 0x28, 0x2c},
+	.xRR	= {0x40, 0x44, 0x48, 0x4c},
+	.xSR	= 0x60,
+	.xCR	= 0x64,
+};
+
 static struct imx_mu_priv *to_imx_mu_priv(struct mbox_controller *mbox)
 {
 	return container_of(mbox, struct imx_mu_priv, mbox);
@@ -88,10 +102,10 @@ static u32 imx_mu_xcr_rmw(struct imx_mu_priv *priv, u32 set, u32 clr)
 	u32 val;
 
 	spin_lock_irqsave(&priv->xcr_lock, flags);
-	val = imx_mu_read(priv, IMX_MU_xCR);
+	val = imx_mu_read(priv, priv->dcfg->xCR);
 	val &= ~clr;
 	val |= set;
-	imx_mu_write(priv, val, IMX_MU_xCR);
+	imx_mu_write(priv, val, priv->dcfg->xCR);
 	spin_unlock_irqrestore(&priv->xcr_lock, flags);
 
 	return val;
@@ -111,8 +125,8 @@ static irqreturn_t imx_mu_isr(int irq, void *p)
 	struct imx_mu_con_priv *cp = chan->con_priv;
 	u32 val, ctrl, dat;
 
-	ctrl = imx_mu_read(priv, IMX_MU_xCR);
-	val = imx_mu_read(priv, IMX_MU_xSR);
+	ctrl = imx_mu_read(priv, priv->dcfg->xCR);
+	val = imx_mu_read(priv, priv->dcfg->xSR);
 
 	switch (cp->type) {
 	case IMX_MU_TYPE_TX:
@@ -138,10 +152,10 @@ static irqreturn_t imx_mu_isr(int irq, void *p)
 		imx_mu_xcr_rmw(priv, 0, IMX_MU_xCR_TIEn(cp->idx));
 		mbox_chan_txdone(chan, 0);
 	} else if (val == IMX_MU_xSR_RFn(cp->idx)) {
-		dat = imx_mu_read(priv, IMX_MU_xRRn(cp->idx));
+		dat = imx_mu_read(priv, priv->dcfg->xRR[cp->idx]);
 		mbox_chan_received_data(chan, (void *)&dat);
 	} else if (val == IMX_MU_xSR_GIPn(cp->idx)) {
-		imx_mu_write(priv, IMX_MU_xSR_GIPn(cp->idx), IMX_MU_xSR);
+		imx_mu_write(priv, IMX_MU_xSR_GIPn(cp->idx), priv->dcfg->xSR);
 		mbox_chan_received_data(chan, NULL);
 	} else {
 		dev_warn_ratelimited(priv->dev, "Not handled interrupt\n");
@@ -159,7 +173,7 @@ static int imx_mu_send_data(struct mbox_chan *chan, void *data)
 
 	switch (cp->type) {
 	case IMX_MU_TYPE_TX:
-		imx_mu_write(priv, *arg, IMX_MU_xTRn(cp->idx));
+		imx_mu_write(priv, *arg, priv->dcfg->xTR[cp->idx]);
 		imx_mu_xcr_rmw(priv, IMX_MU_xCR_TIEn(cp->idx), 0);
 		break;
 	case IMX_MU_TYPE_TXDB:
@@ -270,7 +284,7 @@ static void imx_mu_init_generic(struct imx_mu_priv *priv)
 		return;
 
 	/* Set default MU configuration */
-	imx_mu_write(priv, 0, IMX_MU_xCR);
+	imx_mu_write(priv, 0, priv->dcfg->xCR);
 }
 
 static int imx_mu_probe(struct platform_device *pdev)
@@ -278,6 +292,7 @@ static int imx_mu_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct device_node *np = dev->of_node;
 	struct imx_mu_priv *priv;
+	const struct imx_mu_dcfg *dcfg;
 	unsigned int i;
 	int ret;
 
@@ -295,6 +310,11 @@ static int imx_mu_probe(struct platform_device *pdev)
 	if (priv->irq < 0)
 		return priv->irq;
 
+	dcfg = of_device_get_match_data(dev);
+	if (!dcfg)
+		return -EINVAL;
+	priv->dcfg = dcfg;
+
 	priv->clk = devm_clk_get(dev, NULL);
 	if (IS_ERR(priv->clk)) {
 		if (PTR_ERR(priv->clk) != -ENOENT)
@@ -348,7 +368,8 @@ static int imx_mu_remove(struct platform_device *pdev)
 }
 
 static const struct of_device_id imx_mu_dt_ids[] = {
-	{ .compatible = "fsl,imx6sx-mu" },
+	{ .compatible = "fsl,imx7ulp-mu", .data = &imx_mu_cfg_imx7ulp },
+	{ .compatible = "fsl,imx6sx-mu", .data = &imx_mu_cfg_imx6sx },
 	{ },
 };
 MODULE_DEVICE_TABLE(of, imx_mu_dt_ids);
-- 
2.7.4

RE: [PATCH v5 1/4] mailbox: imx: Fix Tx doorbell shutdown path

[Aisheng Dong]

> From: Richard Zhu <hongxing.zhu@nxp.com>
> Sent: Monday, August 5, 2019 10:51 AM
> 
> Tx doorbell is handled by txdb_tasklet and doesn't have an associated IRQ.
> 
> Anyhow, imx_mu_shutdown ignores this and tries to free an IRQ that wasn't
> requested for Tx DB resulting in the following warning:
> 
> [    1.967644] Trying to free already-free IRQ 26
> [    1.972108] WARNING: CPU: 2 PID: 157 at kernel/irq/manage.c:1708
> __free_irq+0xc0/0x358
> [    1.980024] Modules linked in:
> [    1.983088] CPU: 2 PID: 157 Comm: kworker/2:1 Tainted: G
> [    1.993524] Hardware name: Freescale i.MX8QXP MEK (DT)
> [    1.998668] Workqueue: events deferred_probe_work_func
> [    2.003812] pstate: 60000085 (nZCv daIf -PAN -UAO)
> [    2.008607] pc : __free_irq+0xc0/0x358
> [    2.012364] lr : __free_irq+0xc0/0x358
> [    2.016111] sp : ffff00001179b7e0
> [    2.019422] x29: ffff00001179b7e0 x28: 0000000000000018
> [    2.024736] x27: ffff000011233000 x26: 0000000000000004
> [    2.030053] x25: 000000000000001a x24: ffff80083bec74d4
> [    2.035369] x23: 0000000000000000 x22: ffff80083bec7588
> [    2.040686] x21: ffff80083b1fe8d8 x20: ffff80083bec7400
> [    2.046003] x19: 0000000000000000 x18: ffffffffffffffff
> [    2.051320] x17: 0000000000000000 x16: 0000000000000000
> [    2.056637] x15: ffff0000111296c8 x14: ffff00009179b517
> [    2.061953] x13: ffff00001179b525 x12: ffff000011142000
> [    2.067270] x11: ffff000011129f20 x10: ffff0000105da970
> [    2.072587] x9 : 00000000ffffffd0 x8 : 0000000000000194
> [    2.077903] x7 : 612065657266206f x6 : ffff0000111e7b09
> [    2.083220] x5 : 0000000000000003 x4 : 0000000000000000
> [    2.088537] x3 : 0000000000000000 x2 : 00000000ffffffff
> [    2.093854] x1 : 28b70f0a2b60a500 x0 : 0000000000000000
> [    2.099173] Call trace:
> [    2.101618]  __free_irq+0xc0/0x358
> [    2.105021]  free_irq+0x38/0x98
> [    2.108170]  imx_mu_shutdown+0x90/0xb0
> [    2.111921]  mbox_free_channel.part.2+0x24/0xb8
> [    2.116453]  mbox_free_channel+0x18/0x28
> 
> This bug is present from the beginning of times.
> 
> Cc: Oleksij Rempel <o.rempel@pengutronix.de>
> Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>
> Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>

I think you should keep the original author and Fixes tag.
Otherwise:
Reviewed-by: Dong Aisheng <aisheng.dong@nxp.com>

Regards
Aisheng

RE: [PATCH v5 2/4] mailbox: imx: Clear the right interrupts at shutdown

[Aisheng Dong]

> From: Richard Zhu <hongxing.zhu@nxp.com>
> Sent: Monday, August 5, 2019 10:51 AM
> 
> Make sure to only clear enabled interrupts keeping count of the connection
> type.
> 
> Suggested-by: Oleksij Rempel <o.rempel@pengutronix.de>
> Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>
> Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>

Keep original author if any.
Otherwise:
Reviewed-by: Dong Aisheng <aisheng.dong@nxp.com>

Regards
Aisheng

> ---
>  drivers/mailbox/imx-mailbox.c | 15 +++++++++++++--
>  1 file changed, 13 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mailbox/imx-mailbox.c b/drivers/mailbox/imx-mailbox.c
> index 1eeabc5..afe625e 100644
> --- a/drivers/mailbox/imx-mailbox.c
> +++ b/drivers/mailbox/imx-mailbox.c
> @@ -219,8 +219,19 @@ static void imx_mu_shutdown(struct mbox_chan
> *chan)
>  		return;
>  	}
> 
> -	imx_mu_xcr_rmw(priv, 0,
> -		   IMX_MU_xCR_TIEn(cp->idx) | IMX_MU_xCR_RIEn(cp->idx));
> +	switch (cp->type) {
> +	case IMX_MU_TYPE_TX:
> +		imx_mu_xcr_rmw(priv, 0, IMX_MU_xCR_TIEn(cp->idx));
> +		break;
> +	case IMX_MU_TYPE_RX:
> +		imx_mu_xcr_rmw(priv, 0, IMX_MU_xCR_RIEn(cp->idx));
> +		break;
> +	case IMX_MU_TYPE_RXDB:
> +		imx_mu_xcr_rmw(priv, 0, IMX_MU_xCR_GIEn(cp->idx));
> +		break;
> +	default:
> +		break;
> +	}
> 
>  	free_irq(priv->irq, chan);
>  }
> --
> 2.7.4

RE: [PATCH v5 3/4] dt-bindings: mailbox: imx-mu: add imx7ulp MU support

[Aisheng Dong]

> From: Richard Zhu <hongxing.zhu@nxp.com>
> Sent: Monday, August 5, 2019 10:52 AM
> 
> There is a version 1.0 MU on imx7ulp, use "fsl,imx7ulp-mu" compatible to
> support it.
> 
> Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>

Reviewed-by: Dong Aisheng <aisheng.dong@nxp.com>

Regards
Aisheng

RE: [PATCH v5 1/4] mailbox: imx: Fix Tx doorbell shutdown path

[Richard Zhu]

> -----Original Message-----
> From: Aisheng Dong
> Sent: 2019年8月5日 12:38
> To: Richard Zhu <hongxing.zhu@nxp.com>; jassisinghbrar@gmail.com;
> o.rempel@pengutronix.de; Daniel Baluta <daniel.baluta@nxp.com>
> Cc: dl-linux-imx <linux-imx@nxp.com>; linux-kernel@vger.kernel.org;
> linux-arm-kernel@lists.infradead.org; Richard Zhu <hongxing.zhu@nxp.com>
> Subject: RE: [PATCH v5 1/4] mailbox: imx: Fix Tx doorbell shutdown path
> 
> > From: Richard Zhu <hongxing.zhu@nxp.com>
> > Sent: Monday, August 5, 2019 10:51 AM
> >
> > Tx doorbell is handled by txdb_tasklet and doesn't have an associated IRQ.
> >
> > Anyhow, imx_mu_shutdown ignores this and tries to free an IRQ that
> > wasn't requested for Tx DB resulting in the following warning:
> >
> > [    1.967644] Trying to free already-free IRQ 26
> > [    1.972108] WARNING: CPU: 2 PID: 157 at kernel/irq/manage.c:1708
> > __free_irq+0xc0/0x358
> > [    1.980024] Modules linked in:
> > [    1.983088] CPU: 2 PID: 157 Comm: kworker/2:1 Tainted: G
> > [    1.993524] Hardware name: Freescale i.MX8QXP MEK (DT)
> > [    1.998668] Workqueue: events deferred_probe_work_func
> > [    2.003812] pstate: 60000085 (nZCv daIf -PAN -UAO)
> > [    2.008607] pc : __free_irq+0xc0/0x358
> > [    2.012364] lr : __free_irq+0xc0/0x358
> > [    2.016111] sp : ffff00001179b7e0
> > [    2.019422] x29: ffff00001179b7e0 x28: 0000000000000018
> > [    2.024736] x27: ffff000011233000 x26: 0000000000000004
> > [    2.030053] x25: 000000000000001a x24: ffff80083bec74d4
> > [    2.035369] x23: 0000000000000000 x22: ffff80083bec7588
> > [    2.040686] x21: ffff80083b1fe8d8 x20: ffff80083bec7400
> > [    2.046003] x19: 0000000000000000 x18: ffffffffffffffff
> > [    2.051320] x17: 0000000000000000 x16: 0000000000000000
> > [    2.056637] x15: ffff0000111296c8 x14: ffff00009179b517
> > [    2.061953] x13: ffff00001179b525 x12: ffff000011142000
> > [    2.067270] x11: ffff000011129f20 x10: ffff0000105da970
> > [    2.072587] x9 : 00000000ffffffd0 x8 : 0000000000000194
> > [    2.077903] x7 : 612065657266206f x6 : ffff0000111e7b09
> > [    2.083220] x5 : 0000000000000003 x4 : 0000000000000000
> > [    2.088537] x3 : 0000000000000000 x2 : 00000000ffffffff
> > [    2.093854] x1 : 28b70f0a2b60a500 x0 : 0000000000000000
> > [    2.099173] Call trace:
> > [    2.101618]  __free_irq+0xc0/0x358
> > [    2.105021]  free_irq+0x38/0x98
> > [    2.108170]  imx_mu_shutdown+0x90/0xb0
> > [    2.111921]  mbox_free_channel.part.2+0x24/0xb8
> > [    2.116453]  mbox_free_channel+0x18/0x28
> >
> > This bug is present from the beginning of times.
> >
> > Cc: Oleksij Rempel <o.rempel@pengutronix.de>
> > Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>
> > Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
> 
> I think you should keep the original author and Fixes tag.
> Otherwise:
> Reviewed-by: Dong Aisheng <aisheng.dong@nxp.com>
> 
[Richard Zhu] Sorry about the author changes, because there are confliction
 when I use "git am" to merge this patch.
Would change the author back, and re-send the v5 patch-set.
> Regards
> Aisheng