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From: Frank Li <Frank.li@oss.nxp.com>
To: Pengpeng Hou <pengpeng@iscas.ac.cn>
Cc: Miquel Raynal <miquel.raynal@bootlin.com>,
	Frank Li <Frank.Li@nxp.com>,
	Alexandre Belloni <alexandre.belloni@bootlin.com>,
	linux-i3c@lists.infradead.org, imx@lists.linux.dev,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] i3c: master: svc: report timeout waiting for STOP idle
Date: Tue, 23 Jun 2026 09:23:41 -0500	[thread overview]
Message-ID: <ajqW7U8cM0ybj2Jr@SMW015318> (raw)
In-Reply-To: <20260623060821.23238-1-pengpeng@iscas.ac.cn>

On Tue, Jun 23, 2026 at 02:08:21PM +0800, Pengpeng Hou wrote:
>
> svc_i3c_master_xfer() emits STOP or force-exit for the final transfer
> and then waits for the controller state to become idle, but ignores
> readl_poll_timeout(). The function can therefore return success while
> the controller is still not idle.
>
> Return the idle-wait error through the existing warning/FIFO cleanup
> path so the caller observes the failed transfer without emitting a
> second STOP after the final STOP or force-exit has already been sent.
>
> Signed-off-by: Pengpeng Hou <pengpeng@iscas.ac.cn>
> ---

Dose you really met timeout? if yes, what step to reproduce it. Suppose
only few FCLK to emit STOP or force-exit unconditional.

Any way not harmful to add check it.

Reviewed-by: Frank Li <Frank.Li@nxp.com>

>  drivers/i3c/master/svc-i3c-master.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i3c-master.c
> index 93805df8a940..93ae6eb1a355 100644
> --- a/drivers/i3c/master/svc-i3c-master.c
> +++ b/drivers/i3c/master/svc-i3c-master.c
> @@ -1488,8 +1488,11 @@ static int svc_i3c_master_xfer(struct svc_i3c_master *master,
>                         svc_i3c_master_emit_force_exit(master);
>
>                 /* Wait idle if stop is sent. */
> -               readl_poll_timeout(master->regs + SVC_I3C_MSTATUS, reg,
> -                                  SVC_I3C_MSTATUS_STATE_IDLE(reg), 0, 1000);
> +               ret = readl_poll_timeout(master->regs + SVC_I3C_MSTATUS, reg,
> +                                        SVC_I3C_MSTATUS_STATE_IDLE(reg),
> +                                        0, 1000);
> +               if (ret)
> +                       goto cleanup;
>         }
>
>         return 0;
> @@ -1502,6 +1505,7 @@ static int svc_i3c_master_xfer(struct svc_i3c_master *master,
>         else
>                 svc_i3c_master_emit_force_exit(master);
>
> +cleanup:
>         svc_i3c_master_clear_merrwarn(master);
>         svc_i3c_master_flush_fifo(master);
>
> --
> 2.50.1 (Apple Git-155)
>
>

-- 
linux-i3c mailing list
linux-i3c@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-i3c

WARNING: multiple messages have this Message-ID (diff)
From: Frank Li <Frank.li@oss.nxp.com>
To: Pengpeng Hou <pengpeng@iscas.ac.cn>
Cc: Miquel Raynal <miquel.raynal@bootlin.com>,
	Frank Li <Frank.Li@nxp.com>,
	Alexandre Belloni <alexandre.belloni@bootlin.com>,
	linux-i3c@lists.infradead.org, imx@lists.linux.dev,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] i3c: master: svc: report timeout waiting for STOP idle
Date: Tue, 23 Jun 2026 09:23:41 -0500	[thread overview]
Message-ID: <ajqW7U8cM0ybj2Jr@SMW015318> (raw)
In-Reply-To: <20260623060821.23238-1-pengpeng@iscas.ac.cn>

On Tue, Jun 23, 2026 at 02:08:21PM +0800, Pengpeng Hou wrote:
>
> svc_i3c_master_xfer() emits STOP or force-exit for the final transfer
> and then waits for the controller state to become idle, but ignores
> readl_poll_timeout(). The function can therefore return success while
> the controller is still not idle.
>
> Return the idle-wait error through the existing warning/FIFO cleanup
> path so the caller observes the failed transfer without emitting a
> second STOP after the final STOP or force-exit has already been sent.
>
> Signed-off-by: Pengpeng Hou <pengpeng@iscas.ac.cn>
> ---

Dose you really met timeout? if yes, what step to reproduce it. Suppose
only few FCLK to emit STOP or force-exit unconditional.

Any way not harmful to add check it.

Reviewed-by: Frank Li <Frank.Li@nxp.com>

>  drivers/i3c/master/svc-i3c-master.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i3c-master.c
> index 93805df8a940..93ae6eb1a355 100644
> --- a/drivers/i3c/master/svc-i3c-master.c
> +++ b/drivers/i3c/master/svc-i3c-master.c
> @@ -1488,8 +1488,11 @@ static int svc_i3c_master_xfer(struct svc_i3c_master *master,
>                         svc_i3c_master_emit_force_exit(master);
>
>                 /* Wait idle if stop is sent. */
> -               readl_poll_timeout(master->regs + SVC_I3C_MSTATUS, reg,
> -                                  SVC_I3C_MSTATUS_STATE_IDLE(reg), 0, 1000);
> +               ret = readl_poll_timeout(master->regs + SVC_I3C_MSTATUS, reg,
> +                                        SVC_I3C_MSTATUS_STATE_IDLE(reg),
> +                                        0, 1000);
> +               if (ret)
> +                       goto cleanup;
>         }
>
>         return 0;
> @@ -1502,6 +1505,7 @@ static int svc_i3c_master_xfer(struct svc_i3c_master *master,
>         else
>                 svc_i3c_master_emit_force_exit(master);
>
> +cleanup:
>         svc_i3c_master_clear_merrwarn(master);
>         svc_i3c_master_flush_fifo(master);
>
> --
> 2.50.1 (Apple Git-155)
>
>

  parent reply	other threads:[~2026-06-23 14:24 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-06-23  6:08 [PATCH] i3c: master: svc: report timeout waiting for STOP idle Pengpeng Hou
2026-06-23  6:08 ` Pengpeng Hou
2026-06-23  6:25 ` sashiko-bot
2026-06-23  6:25   ` sashiko-bot
2026-06-23  9:16 ` Miquel Raynal
2026-06-23  9:16   ` Miquel Raynal
2026-06-23 14:23 ` Frank Li [this message]
2026-06-23 14:23   ` Frank Li

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