linux-kernel - Re: [PATCH] usb: typec: tcpci: Add FAULT

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Message-ID: <2024102343-onset-entangled-1047@gregkh>
Date: Wed, 23 Oct 2024 07:08:47 +0200
From: "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
To: Yanik Fuchs <Yanik.fuchs@....ch>
Cc: "heikki.krogerus@...ux.intel.com" <heikki.krogerus@...ux.intel.com>,
	"m.felsch@...gutronix.de" <m.felsch@...gutronix.de>,
	"rdbabiera@...gle.com" <rdbabiera@...gle.com>,
	"u.kleine-koenig@...libre.com" <u.kleine-koenig@...libre.com>,
	Emanuele Ghidoli <emanuele.ghidoli@...adex.com>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] usb: typec: tcpci: Add FAULT_ALERT handling

On Tue, Oct 22, 2024 at 05:06:46PM +0000, Yanik Fuchs wrote:
> Good Evening
> 
> This is my first Pull request for the Linux Kernel, I hope, I have formatted it correctly.
> The info about the Patch should be clear from the message I added, I hope.
> 
> 
> Freundliche Grüsse
> 
> Best regards
> 
> 
> Yanik Fuchs
> [cid:239faadc-5aa5-4417-b69c-5afc0ce01589]<https://www.mbv.ch/en/>
> MBV AG
> Microbiology and Bioanalytic
> Industriestrasse 9, CH-8712 Stäfa
> [cid:a21e1738-fbcb-44ca-b6ba-611f60800d18]<https://www.linkedin.com/company/25071130/>  [cid:9c47fbef-89db-4406-89ee-a2b4487eeaf2] <https://www.youtube.com/channel/UC3vLuuteeanNc1wX9OTARDQ>     Legal disclaimer<https://www.mbv.ch/en/about-us/imprint/>
> 
> [cid:bc59151f-ea88-4e9b-ac75-03cfb28b780f]<https://www.mbv.ch/en/about-mbv/events/>
> 
> >From 133cda1dff7e87f999506164533bbb1cfaf8fe7e Mon Sep 17 00:00:00 2001
> From: yfu <yanikfuchs@...com>
> Date: Tue, 22 Oct 2024 18:27:49 +0200
> Subject: [PATCH] usb: typec: tcpci: Add FAULT_ALERT handling
>  message
> 
> I encountered an issue, where I was not able to communicate with other
> i2c devices, if ptn5110 was initiated while it was seeing Vbus.
> 
> i2c analysis did show, that ALERT_FAULT pin is asserted and
> reasserts on try to acknowledge it, because there is still an asserted
> pin in FAULT_STATUS. This results in Alert GPIO being always low.
> 
> With this Commit, I add a function to the IRQ handler, which acknowledges
> all asserted Pins in FAULT_STATUS register. With this patch, ALERT_STATUS can be acknowledged without issues.
> ---
>  drivers/usb/typec/tcpm/tcpci.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/usb/typec/tcpm/tcpci.c b/drivers/usb/typec/tcpm/tcpci.c
> index ed32583829be..eb885aa4171c 100644
> --- a/drivers/usb/typec/tcpm/tcpci.c
> +++ b/drivers/usb/typec/tcpm/tcpci.c
> @@ -714,6 +714,13 @@ irqreturn_t tcpci_irq(struct tcpci *tcpci)
>     irq_ret = status & tcpci->alert_mask;
> 
>  process_status:
> +   /*
> +   * some chips asert fault alert, even if it is masked.
> +   * The FAULT_STATUS is read and
> +   */
> +   if (status & TCPC_ALERT_FAULT)
> +       regmap_read(tcpci->regmap, TCPC_FAULT_STATUS, &raw);
> +       regmap_write(tcpci->regmap, TCPC_FAULT_STATUS, raw);
>     /*
>      * Clear alert status for everything except RX_STATUS, which shouldn't
>      * be cleared until we have successfully retrieved message.
> --
> 2.34.1
> 
> 
> 



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