linux-kernel - Re: [PATCH 5.5 01/65] gpiolib: Add support for the irqdomain which doesnt use irq

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Date:   Thu, 19 Mar 2020 22:47:53 +0800
From:   Kevin Hao <haokexin@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Linus Walleij <linus.walleij@...aro.org>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 5.5 01/65] gpiolib: Add support for the irqdomain which
 doesnt use irq_fwspec as arg

On Thu, Mar 19, 2020 at 02:47:10PM +0100, Greg Kroah-Hartman wrote:
> On Thu, Mar 19, 2020 at 09:33:55PM +0800, Kevin Hao wrote:
> > On Thu, Mar 19, 2020 at 02:03:43PM +0100, Greg Kroah-Hartman wrote:
> > > From: Kevin Hao <haokexin@...il.com>
> > > 
> > > [ Upstream commit 242587616710576808dc8d7cdf18cfe0d7bf9831 ]
> > > 
> > > Some gpio's parent irqdomain may not use the struct irq_fwspec as
> > > argument, such as msi irqdomain. So rename the callback
> > > populate_parent_fwspec() to populate_parent_alloc_arg() and make it
> > > allocate and populate the specific struct which is needed by the
> > > parent irqdomain.
> > 
> > Hi Greg,
> > 
> > This commit shouldn't go to stable because it is not a bug fix. It is just a
> > prerequisite of switching to general GPIOLIB_IRQCHIP for thunderx gpio driver
> > (commit 7a9f4460f74d "gpio: thunderx: Switch to GPIOLIB_IRQCHIP").
> 
> This seems to be a prerequisite for f98371476f36 ("pinctrl: qcom:
> ssbi-gpio: Fix fwspec parsing bug") to apply properly.  With that
> information, is it ok to keep?

Yes, this commit does change the context of commit f98371476f36 ("pinctrl: qcom:
ssbi-gpio: Fix fwspec parsing bug"). So I am fine to keep this in order to apply
f98371476f36 cleanly. But there is no really logical dependency between these two
commits, so another option is that we can adjust the commit f98371476f36 a bit in order
to apply to v5.5.x cleanly without this commit, something like below. IMHO, it is more
suitable for the stable kernel.

From 2678327511f77edd8692634e81ef04cd9ca4b249 Mon Sep 17 00:00:00 2001
From: Linus Walleij <linus.walleij@...aro.org>
Date: Fri, 6 Mar 2020 15:34:15 +0100
Subject: [PATCH] pinctrl: qcom: ssbi-gpio: Fix fwspec parsing bug

[ Upstream commit f98371476f36359da2285d1807b43e5b17fd18de ]

We are parsing SSBI gpios as fourcell fwspecs but they are
twocell. Probably a simple copy-and-paste bug.

Tested on the APQ8060 DragonBoard and after this ethernet
and MMC card detection works again.

Cc: Bjorn Andersson <bjorn.andersson@...aro.org>
Cc: stable@...r.kernel.org
Reviewed-by: Brian Masney <masneyb@...tation.org>
Fixes: ae436fe81053 ("pinctrl: ssbi-gpio: convert to hierarchical IRQ helpers in gpio core")
Link: https://lore.kernel.org/r/20200306143416.1476250-1-linus.walleij@linaro.org
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
[Kevin: Replace .populate_parent_alloc_arg with .populate_parent_fwspec]
Signed-off-by: Kevin Hao <haokexin@...il.com>
---
 drivers/pinctrl/qcom/pinctrl-ssbi-gpio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pinctrl/qcom/pinctrl-ssbi-gpio.c b/drivers/pinctrl/qcom/pinctrl-ssbi-gpio.c
index dca86886b1f9..6b7f0d56a532 100644
--- a/drivers/pinctrl/qcom/pinctrl-ssbi-gpio.c
+++ b/drivers/pinctrl/qcom/pinctrl-ssbi-gpio.c
@@ -794,7 +794,7 @@ static int pm8xxx_gpio_probe(struct platform_device *pdev)
 	girq->fwnode = of_node_to_fwnode(pctrl->dev->of_node);
 	girq->parent_domain = parent_domain;
 	girq->child_to_parent_hwirq = pm8xxx_child_to_parent_hwirq;
-	girq->populate_parent_fwspec = gpiochip_populate_parent_fwspec_fourcell;
+	girq->populate_parent_fwspec = gpiochip_populate_parent_fwspec_twocell;
 	girq->child_offset_to_irq = pm8xxx_child_offset_to_irq;
 	girq->child_irq_domain_ops.translate = pm8xxx_domain_translate;
 
-- 
2.25.1.377.g2d2118b814c1

Thanks,
Kevin


> 
> thanks,
> 
> greg k-h

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