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

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Date:   Mon, 09 Sep 2019 11:23:57 +0930
From:   "Andrew Jeffery" <andrew@...id.au>
To:     linux-gpio@...r.kernel.org,
        "Linus Walleij" <linus.walleij@...aro.org>
Cc:     "Joel Stanley" <joel@....id.au>, linux-aspeed@...ts.ozlabs.org,
        openbmc@...ts.ozlabs.org, linux-arm-kernel@...ts.infradead.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, 29 Aug 2019, at 16:47, Andrew Jeffery 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>
> 
> ---
> Hi Linus,
> 
> The timing of merging the AST2600 (g6) driver and 674fa8daa8c9 ("pinctrl:
> aspeed-g5: Delay acquisition of regmaps") caused a bit of a rough spot a
> few weeks back. This fix doesn't cause any such disruption - I've
> developed it on top of pinctrl/fixes and back-merged the result into
> pinctrl/devel to test for build breakage (via CONFIG_COMPILE_TEST to
> enable all of the g4, g5 and g6 drivers). All three ASPEED pinctrl
> drivers built successfully, so it should be enough to simply take this
> patch through pinctrl/fixes and leave pinctrl/devel as is for the 5.4
> merge window.
> ---

Ping? Was hoping to get this merged before 5.3 is tagged.

Andrew