linux-kernel - Re: [PATCH pinctrl/fixes] pinctrl: aspeed: Fix spurious mux failures on the AST2500

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Date:   Thu, 12 Sep 2019 09:23:55 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Andrew Jeffery <andrew@...id.au>
Cc:     "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Joel Stanley <joel@....id.au>,
        linux-aspeed <linux-aspeed@...ts.ozlabs.org>,
        OpenBMC Maillist <openbmc@...ts.ozlabs.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        John Wang <wangzqbj@...pur.com>
Subject: Re: [PATCH pinctrl/fixes] pinctrl: aspeed: Fix spurious mux failures
 on the AST2500

On Thu, Aug 29, 2019 at 8:17 AM Andrew Jeffery <andrew@...id.au> wrote:

> Commit 674fa8daa8c9 ("pinctrl: aspeed-g5: Delay acquisition of regmaps")
> was determined to be a partial fix to the problem of acquiring the LPC
> Host Controller and GFX regmaps: The AST2500 pin controller may need to
> fetch syscon regmaps during expression evaluation as well as when
> setting mux state. For example, this case is hit by attempting to export
> pins exposing the LPC Host Controller as GPIOs.
>
> An optional eval() hook is added to the Aspeed pinmux operation struct
> and called from aspeed_sig_expr_eval() if the pointer is set by the
> SoC-specific driver. This enables the AST2500 to perform the custom
> action of acquiring its regmap dependencies as required.
>
> John Wang tested the fix on an Inspur FP5280G2 machine (AST2500-based)
> where the issue was found, and I've booted the fix on Witherspoon
> (AST2500) and Palmetto (AST2400) machines, and poked at relevant pins
> under QEMU by forcing mux configurations via devmem before exporting
> GPIOs to exercise the driver.
>
> Fixes: 7d29ed88acbb ("pinctrl: aspeed: Read and write bits in LPC and GFX controllers")
> Fixes: 674fa8daa8c9 ("pinctrl: aspeed-g5: Delay acquisition of regmaps")
> Reported-by: John Wang <wangzqbj@...pur.com>
> Tested-by: John Wang <wangzqbj@...pur.com>
> Signed-off-by: Andrew Jeffery <andrew@...id.au>

Applied for fixes already yesterday!

Yours,
Linus Walleij