linux-kernel - Re: [PATCH] i3c: dw: Disable IBI IRQ depends on hot-join and SIR enabling

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Date: Mon, 06 May 2024 14:58:06 +0800
From: Jeremy Kerr <jk@...econstruct.com.au>
To: Dylan Hung <dylan_hung@...eedtech.com>, "alexandre.belloni@...tlin.com"
 <alexandre.belloni@...tlin.com>, "joel@....id.au" <joel@....id.au>, 
 "u.kleine-koenig@...gutronix.de" <u.kleine-koenig@...gutronix.de>,
 "gustavoars@...nel.org" <gustavoars@...nel.org>,
 "krzysztof.kozlowski@...aro.org" <krzysztof.kozlowski@...aro.org>,
 "zenghuchen@...gle.com" <zenghuchen@...gle.com>,
 "matt@...econstruct.com.au" <matt@...econstruct.com.au>, 
 "linux-i3c@...ts.infradead.org" <linux-i3c@...ts.infradead.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc: BMC-SW <BMC-SW@...eedtech.com>
Subject: Re: [PATCH] i3c: dw: Disable IBI IRQ depends on hot-join and SIR
 enabling

Hi Dylan,

> > The initial state would be to have all SIRs masked.
> > 
> 
> Yes, indeed. The "global" variable is also true because "reg ==
> 0xffffffff" is true.
> Therefore, the INTR_IBI_THLD_STAT bit will be set in the following
> code.

That's mainly my point - none of this code is ever run unless the
->enable_ibi or ->disable_ibi controller callback is invoked.

So we'll end up with the HJ interrupt only being enabled if some i3c
device driver enables IBIs, which is a bit of a weird side-effect.

It probably makes more sense when the rest of the HJ code is added, but
not so much as a standalone patch.

Cheers,


Jeremy