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Message-ID: <55EF11E6.7030307@arm.com>
Date: Tue, 8 Sep 2015 17:50:46 +0100
From: Sudeep Holla <sudeep.holla@....com>
To: maoguang meng <maoguang.meng@...iatek.com>
Cc: Daniel Kurtz <djkurtz@...omium.org>,
Sudeep Holla <Sudeep.Holla@....com>,
Linus Walleij <linus.walleij@...aro.org>,
Hongzhou Yang <hongzhou.yang@...iatek.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
"linux-mediatek@...ts.infradead.org"
<linux-mediatek@...ts.infradead.org>,
Matthias Brugger <matthias.bgg@...il.com>,
Yingjoe Chen <yingjoe.chen@...iatek.com>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v4] pinctrl: mediatek: Implement wake handler and suspend
resume
On 08/09/15 10:28, Sudeep Holla wrote:
>
>
> On 06/09/15 11:39, maoguang meng wrote:
>> On Wed, 2015-09-02 at 14:02 +0800, Daniel Kurtz wrote:
>>> Hi maoguang,
>>>
>>> On Tue, Aug 25, 2015 at 12:27 AM, Sudeep Holla <sudeep.holla@....com> wrote:
>>>>
>>>>
>>>> On 14/08/15 09:38, maoguang.meng@...iatek.com wrote:
>>>>>
>>>>> From: Maoguang Meng <maoguang.meng@...iatek.com>
>>>>>
>>>>> This patch implement irq_set_wake to get who is wakeup source and
>>>>> setup on suspend resume.
>>>>>
>>>>> Signed-off-by: Maoguang Meng <maoguang.meng@...iatek.com>
>>>>>
>>> [snip]
>>>
>>> Can you please respond to Sudeep's questions:
>>>
>>>> Does this pinmux controller:
>>>>
>>>> 1. Support wake-up configuration ? If not, you need to use
>>>> IRQCHIP_SKIP_SET_WAKE. I don't see any value in writing the
>>>> mask_{set,clear} if the same registers are used for {en,dis}able
>>
>> YES.
>> we can call enable_irq_wake(irq) to config this irq as a wake-up
>> source.
>>
>
> No that doesn't answer my question. Yes you can always call
> enable_irq_wake(irq) as along as you have irq_set_wake implemented.
> But my question was does this pinmux controller support wake-up
> configuration.
>
> IMHO, by looking at the implementation I can confirm *NO*, it doesn't.
> So please stop copy-pasting the implementation from other drivers.
> The reason is you operate on the same mask_{set,clear} which you use
> to {en,dis}able the interrupts which means you don't have to do anything
> to configure an interrupt as a wakeup source other than just keeping
> them enabled. Hopefully this clarifies.
>
>>>>
>>>> 2. Is in always on domain ? If not, you need save/restore only to
>>>> resume back the functionality. Generally we can set
>>>> IRQCHIP_MASK_ON_SUSPEND to ensure non-wake-up interrupts are
>>>> disabled during suspend and re-enabled in resume path. You just
>>>> save/restore raw values without tracking the wake-up source.
>>
>> YES.
>>
>
> Again *YES* for what part of my question. If it's always-on, then you
> don't need this suspend/resume callbacks at all, so I assume the answer
> is *NO*.
>
IIUC this pinmux controller, something like below should work.
---->8
From 7c26992bce047efb66a6ba8d2ffec2b272499df7 Mon Sep 17 00:00:00 2001
From: Sudeep Holla <sudeep.holla@....com>
Date: Tue, 8 Sep 2015 17:35:38 +0100
Subject: [PATCH] pinctrl: mediatek: Enable SKIP_SET_WAKE and MASK_ON_SUSPEND
The mediatek pinmux controller doesn't provides any facility to configure
the wakeup sources. So instead of providing redundant irq_set_wake
functionality, SKIP_SET_WAKE could be set to it. Also there's no need to
maintain 2 sets of masks.
This patch enables IRQCHIP_SKIP_SET_WAKE and IRQCHIP_MASK_ON_SUSPEND and
also removes wake_mask.
Cc: Linus Walleij <linus.walleij@...aro.org>
Cc: Matthias Brugger <matthias.bgg@...il.com>
Cc: Hongzhou Yang <hongzhou.yang@...iatek.com>
Cc: Yingjoe Chen <yingjoe.chen@...iatek.com>
Cc: Maoguang Meng <maoguang.meng@...iatek.com>
Cc: Chaotian Jing <chaotian.jing@...iatek.com>
Cc: linux-gpio@...r.kernel.org
Cc: linux-mediatek@...ts.infradead.org
Signed-off-by: Sudeep Holla <sudeep.holla@....com>
---
drivers/pinctrl/mediatek/pinctrl-mtk-common.c | 24
+-----------------------
drivers/pinctrl/mediatek/pinctrl-mtk-common.h | 1 -
2 files changed, 1 insertion(+), 24 deletions(-)
diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
b/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
index 7726c6caaf83..d8e194a5bb31 100644
--- a/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
+++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
@@ -1063,20 +1063,6 @@ static int mtk_eint_set_type(struct irq_data *d,
return 0;
}
-static int mtk_eint_irq_set_wake(struct irq_data *d, unsigned int on)
-{
- struct mtk_pinctrl *pctl = irq_data_get_irq_chip_data(d);
- int shift = d->hwirq & 0x1f;
- int reg = d->hwirq >> 5;
-
- if (on)
- pctl->wake_mask[reg] |= BIT(shift);
- else
- pctl->wake_mask[reg] &= ~BIT(shift);
-
- return 0;
-}
-
static void mtk_eint_chip_write_mask(const struct mtk_eint_offsets *chip,
void __iomem *eint_reg_base, u32 *buf)
{
@@ -1112,7 +1098,6 @@ static int mtk_eint_suspend(struct device *device)
reg = pctl->eint_reg_base;
mtk_eint_chip_read_mask(eint_offsets, reg, pctl->cur_mask);
- mtk_eint_chip_write_mask(eint_offsets, reg, pctl->wake_mask);
return 0;
}
@@ -1153,9 +1138,9 @@ static struct irq_chip mtk_pinctrl_irq_chip = {
.irq_unmask = mtk_eint_unmask,
.irq_ack = mtk_eint_ack,
.irq_set_type = mtk_eint_set_type,
- .irq_set_wake = mtk_eint_irq_set_wake,
.irq_request_resources = mtk_pinctrl_irq_request_resources,
.irq_release_resources = mtk_pinctrl_irq_release_resources,
+ .flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_MASK_ON_SUSPEND,
};
static unsigned int mtk_eint_init(struct mtk_pinctrl *pctl)
@@ -1393,13 +1378,6 @@ int mtk_pctrl_init(struct platform_device *pdev,
}
ports_buf = pctl->devdata->eint_offsets.ports;
- pctl->wake_mask = devm_kcalloc(&pdev->dev, ports_buf,
- sizeof(*pctl->wake_mask), GFP_KERNEL);
- if (!pctl->wake_mask) {
- ret = -ENOMEM;
- goto chip_error;
- }
-
pctl->cur_mask = devm_kcalloc(&pdev->dev, ports_buf,
sizeof(*pctl->cur_mask), GFP_KERNEL);
if (!pctl->cur_mask) {
diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common.h
b/drivers/pinctrl/mediatek/pinctrl-mtk-common.h
index 55a534338931..acd804a945d8 100644
--- a/drivers/pinctrl/mediatek/pinctrl-mtk-common.h
+++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common.h
@@ -267,7 +267,6 @@ struct mtk_pinctrl {
void __iomem *eint_reg_base;
struct irq_domain *domain;
int *eint_dual_edges;
- u32 *wake_mask;
u32 *cur_mask;
};
--
1.9.1
--
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