linux-kernel - Re: [PATCH v3 10/11] i3c: master: svc: wait for Manual ACK/NACK Done before next step

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Message-ID: <20240823182240.4096619b@xps-13>
Date: Fri, 23 Aug 2024 18:22:40 +0200
From: Miquel Raynal <miquel.raynal@...tlin.com>
To: Frank Li <Frank.Li@....com>
Cc: Alexandre Belloni <alexandre.belloni@...tlin.com>, Boris Brezillon
 <boris.brezillon@...labora.com>, Parshuram Thombare <pthombar@...ence.com>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Boris Brezillon
 <bbrezillon@...nel.org>, Arnd Bergmann <arnd@...db.de>, Conor Culhane
 <conor.culhane@...vaco.com>, linux-i3c@...ts.infradead.org,
 linux-kernel@...r.kernel.org, imx@...ts.linux.dev
Subject: Re: [PATCH v3 10/11] i3c: master: svc: wait for Manual ACK/NACK
 Done before next step

Hi Frank,

Frank.Li@....com wrote on Mon, 19 Aug 2024 12:02:04 -0400:

> Wait for the controller to complete emitting ACK/NACK, otherwise the next
> command may be omitted by the hardware.
> 
> Add command done check at svc_i3c_master_nack(ack)_ibi() and change return

	a "command done" check in

the reutnr type

> type to int to indicate wait done timeout.

		flag possible timeouts.

> 
> Signed-off-by: Frank Li <Frank.Li@....com>
> ---
>  drivers/i3c/master/svc-i3c-master.c | 31 +++++++++++++++++++++++++------
>  1 file changed, 25 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i3c-master.c
> index fbb6cef405577..2010495906eb3 100644
> --- a/drivers/i3c/master/svc-i3c-master.c
> +++ b/drivers/i3c/master/svc-i3c-master.c
> @@ -384,10 +384,12 @@ static int svc_i3c_master_handle_ibi(struct svc_i3c_master *master,
>  	return 0;
>  }
>  
> -static void svc_i3c_master_ack_ibi(struct svc_i3c_master *master,
> +static int svc_i3c_master_ack_ibi(struct svc_i3c_master *master,
>  				   bool mandatory_byte)
>  {
>  	unsigned int ibi_ack_nack;
> +	int ret;
> +	u32 reg;
>  
>  	ibi_ack_nack = SVC_I3C_MCTRL_REQUEST_IBI_ACKNACK;
>  	if (mandatory_byte)
> @@ -396,18 +398,31 @@ static void svc_i3c_master_ack_ibi(struct svc_i3c_master *master,
>  		ibi_ack_nack |= SVC_I3C_MCTRL_IBIRESP_ACK_WITHOUT_BYTE;
>  
>  	writel(ibi_ack_nack, master->regs + SVC_I3C_MCTRL);
> +
> +	ret = readl_poll_timeout_atomic(master->regs + SVC_I3C_MSTATUS, reg,
> +					SVC_I3C_MSTATUS_MCTRLDONE(reg), 1, 1000);

Still concerned about the _atomic.

> +	return ret;

	return readl...

> +
>  }

Otherwise LGTM

Reviewed-by: Miquel Raynal <miquel.raynal@...tlin.com>

Thanks,
Miquèl