linux-kernel - Re: [PATCH v2] gpio: tegra186: Fix tegra186_gpio_is

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Date: Wed, 24 Apr 2024 10:31:10 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Prathamesh Shete <pshete@...dia.com>
Cc: linus.walleij@...aro.org, jonathanh@...dia.com, treding@...dia.com, 
	sfr@...b.auug.org.au, linux-gpio@...r.kernel.org, linux-tegra@...r.kernel.org, 
	linux-kernel@...r.kernel.org, mochs@...dia.com, csoto@...dia.com, 
	jamien@...dia.com, smangipudi@...dia.com
Subject: Re: [PATCH v2] gpio: tegra186: Fix tegra186_gpio_is_accessible() check

On Tue, Apr 23, 2024 at 2:00 PM Prathamesh Shete <pshete@...dia.com> wrote:
>
> The controller has several register bits describing access control
> information for a given GPIO pin. When SCR_SEC_[R|W]EN is unset, it
> means we have full read/write access to all the registers for given GPIO
> pin. When SCR_SEC[R|W]EN is set, it means we need to further check the
> accompanying SCR_SEC_G1[R|W] bit to determine read/write access to all
> the registers for given GPIO pin.
>
> This check was previously declaring that a GPIO pin was accessible
> only if either of the following conditions were met:
>
>   - SCR_SEC_REN + SCR_SEC_WEN both set
>
>     or
>
>   - SCR_SEC_REN + SCR_SEC_WEN both set and
>     SCR_SEC_G1R + SCR_SEC_G1W both set
>
> Update the check to properly handle cases where only one of
> SCR_SEC_REN or SCR_SEC_WEN is set.
>
> Fixes: b2b56a163230 ("gpio: tegra186: Check GPIO pin permission before access.")
> Signed-off-by: Prathamesh Shete <pshete@...dia.com>
> ---

No changelog since v1. No Thierry's tag. Please resend.

Bart