linux-kernel - Re: [PATCH 1/1] i3c: master: svc: Modify enabled_events bit 7:0 to act as IBI enable counter

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Message-ID: <202410312305108f8c61cf@mail.local>
Date: Fri, 1 Nov 2024 00:05:10 +0100
From: Alexandre Belloni <alexandre.belloni@...tlin.com>
To: Frank Li <Frank.Li@....com>
Cc: Miquel Raynal <miquel.raynal@...tlin.com>,
	Conor Culhane <conor.culhane@...vaco.com>,
	Clark Wang <xiaoning.wang@....com>,
	"moderated list:SILVACO I3C DUAL-ROLE MASTER" <linux-i3c@...ts.infradead.org>,
	open list <linux-kernel@...r.kernel.org>, imx@...ts.linux.dev
Subject: Re: [PATCH 1/1] i3c: master: svc: Modify enabled_events bit 7:0 to
 act as IBI enable counter

Hello,

On 24/10/2024 16:38:55-0400, Frank Li wrote:
> Fix issue where disabling IBI on one device disables the entire IBI
> interrupt. Modify bit 7:0 of enabled_events to serve as an IBI enable
> counter, ensuring that the system IBI interrupt is disabled only when all
> I3C devices have IBI disabled.
> 
> Cc: stable@...nel.org
> Fixes: 7ff730ca458e ("i3c: master: svc: enable the interrupt in the enable ibi function")
> Signed-off-by: Frank Li <Frank.Li@....com>

This doesn't apply on i3c/next after applying your patches, can you
rebase?

> ---
>  drivers/i3c/master/svc-i3c-master.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i3c-master.c
> index d1ebfba3739c1..66fe0fc12c897 100644
> --- a/drivers/i3c/master/svc-i3c-master.c
> +++ b/drivers/i3c/master/svc-i3c-master.c
> @@ -130,8 +130,8 @@
>  /* This parameter depends on the implementation and may be tuned */
>  #define SVC_I3C_FIFO_SIZE 16
>  
> -#define SVC_I3C_EVENT_IBI	BIT(0)
> -#define SVC_I3C_EVENT_HOTJOIN	BIT(1)
> +#define SVC_I3C_EVENT_IBI	GENMASK(7, 0)
> +#define SVC_I3C_EVENT_HOTJOIN	BIT(31)
>  
>  struct svc_i3c_cmd {
>  	u8 addr;
> @@ -214,7 +214,7 @@ struct svc_i3c_master {
>  		spinlock_t lock;
>  	} ibi;
>  	struct mutex lock;
> -	int enabled_events;
> +	u32 enabled_events;
>  };
>  
>  /**
> @@ -1532,7 +1532,7 @@ static int svc_i3c_master_enable_ibi(struct i3c_dev_desc *dev)
>  		return ret;
>  	}
>  
> -	master->enabled_events |= SVC_I3C_EVENT_IBI;
> +	master->enabled_events++;
>  	svc_i3c_master_enable_interrupts(master, SVC_I3C_MINT_SLVSTART);
>  
>  	return i3c_master_enec_locked(m, dev->info.dyn_addr, I3C_CCC_EVENT_SIR);
> @@ -1544,7 +1544,7 @@ static int svc_i3c_master_disable_ibi(struct i3c_dev_desc *dev)
>  	struct svc_i3c_master *master = to_svc_i3c_master(m);
>  	int ret;
>  
> -	master->enabled_events &= ~SVC_I3C_EVENT_IBI;
> +	master->enabled_events--;
>  	if (!master->enabled_events)
>  		svc_i3c_master_disable_interrupts(master);
>  
> -- 
> 2.34.1
> 

-- 
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com