linux-kernel - Re: [PATCH] firmware: arm_scmi: Avoid to call mbox_client_txdone on txdone

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Date: Thu, 1 Feb 2024 09:44:48 +0100
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Pin-Chuan Liu <flash.liu@...iatek.com>,
 Sudeep Holla <sudeep.holla@....com>,
 Cristian Marussi <cristian.marussi@....com>,
 Matthias Brugger <matthias.bgg@...il.com>
Cc: wsd_upstream@...iatek.com, cylen.yao@...iatek.com,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH] firmware: arm_scmi: Avoid to call mbox_client_txdone on
 txdone_irq mode

Il 01/02/24 05:52, Pin-Chuan Liu ha scritto:
> On txdone_irq mode, tx_tick is done from mbox_chan_txdone.
> Calling to mbox_client_txdone could get error message
> and return directly, add a check to avoid this.
> 
> Signed-off-by: Pin-Chuan Liu <flash.liu@...iatek.com>
> Change-Id: Iacbe0d36ef9cc16974c013c3e94c47dc79eae52b

Change-Id is something internal to you and has no meaning upstream.
Please remove it.

> ---
>   drivers/firmware/arm_scmi/mailbox.c | 8 +++++++-
>   1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/firmware/arm_scmi/mailbox.c b/drivers/firmware/arm_scmi/mailbox.c
> index b8d470417e8f..f6fe801c2e34 100644
> --- a/drivers/firmware/arm_scmi/mailbox.c
> +++ b/drivers/firmware/arm_scmi/mailbox.c
> @@ -8,6 +8,7 @@
>   
>   #include <linux/err.h>
>   #include <linux/device.h>
> +#include <linux/mailbox_controller.h>
>   #include <linux/mailbox_client.h>
>   #include <linux/of.h>
>   #include <linux/of_address.h>
> @@ -275,7 +276,12 @@ static void mailbox_mark_txdone(struct scmi_chan_info *cinfo, int ret,
>   	 * Unfortunately, we have to kick the mailbox framework after we have
>   	 * received our message.
>   	 */
> -	mbox_client_txdone(smbox->chan, ret);
> +
> +	/*
> +	 * With txdone_irq mode, kick can be done by mbox_chan_txdone.
> +	 */

Besides, you need one single line for this comment

Regards,
Angelo

> +	if (!(smbox->chan->mbox->txdone_irq))
> +		mbox_client_txdone(smbox->chan, ret);
>   }
>   
>   static void mailbox_fetch_response(struct scmi_chan_info *cinfo,