[PATCH v3 01/10] mailbox: imx: Forward the timeout/ error in imx_mu_generic_tx()

[Peng Fan]

On Wed, Jun 17, 2026 at 08:55:26AM +0200, Sebastian Andrzej Siewior wrote:
>imx_mu_generic_tx() for the IMX_MU_TYPE_TXDB_V2 type polls on a register
>which may timeout and is recognized as an error. This error is siltently
>dropped and not dropped to the caller.
>
>Forward the error to the caller.
>
>Fixes: b5ef17917f3a7 ("mailbox: imx: fix TXDB_V2 channel race condition")
>Signed-off-by: Sebastian Andrzej Siewior <bigeasy at linutronix.de>
>---
> drivers/mailbox/imx-mailbox.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
>diff --git a/drivers/mailbox/imx-mailbox.c b/drivers/mailbox/imx-mailbox.c
>index 246a9a9e39520..0028073be4a71 100644
>--- a/drivers/mailbox/imx-mailbox.c
>+++ b/drivers/mailbox/imx-mailbox.c
>@@ -227,6 +227,7 @@ static int imx_mu_generic_tx(struct imx_mu_priv *priv,
> 	u32 val;
> 	int ret, count;
> 
>+	ret = 0;
> 	switch (cp->type) {
> 	case IMX_MU_TYPE_TX:
> 		imx_mu_write(priv, *arg, priv->dcfg->xTR + cp->idx * 4);
>@@ -259,7 +260,7 @@ static int imx_mu_generic_tx(struct imx_mu_priv *priv,
> 		return -EINVAL;
> 	}
> 
>-	return 0;
>+	return ret;

We may need to use atomic API for TXDB_V2. For the patchset itself, it
looks good to me.

Reviewed-by: Peng Fan <peng.fan at nxp.com>

> }
> 
> static int imx_mu_generic_rx(struct imx_mu_priv *priv,
>
>-- 
>2.53.0
>