On Tue, Feb 28, 2017 at 7:00 AM, Mika Penttilä
<[email protected]> wrote:
> Recent pulls for mainline pre 4.11 introduced pinctrl setup changes and moved pinctrl-imx to
> use generic helpers.
>
> Net effect was that hog group could not be resolved. I made it work for myself
> with a two stage setup with create and start separated, and dt probe in between them.
>
>
> Signed-off-by: Mika Penttilä <[email protected]>
Sorry for including the whole mail body, some people may have missed the
mail. Notably the i.MX maintainers.
Your patch reminds me of the pinctrl_register() vs pinctrl_register_and_init()
introduced by Tony Lindgren, can you look into this in commit
950b0d91dc108f54bccca5a2f75bb46f2df63d29
"pinctrl: core: Fix regression caused by delayed work for hogs"?
Does switching pinctrl_register_and_init() back to pinctrl_register()
solve your problem?
Gary: have you seen any problem like this?
Yours,
Linus Walleij
> ---
>
> diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
> index d690465..33659c5a 100644
> --- a/drivers/pinctrl/core.c
> +++ b/drivers/pinctrl/core.c
> @@ -2237,6 +2237,47 @@ int devm_pinctrl_register_and_init(struct device *dev,
> }
> EXPORT_SYMBOL_GPL(devm_pinctrl_register_and_init);
>
> +int devm_pinctrl_register_and_init_nostart(struct device *dev,
> + struct pinctrl_desc *pctldesc,
> + void *driver_data,
> + struct pinctrl_dev **pctldev)
> +{
> + struct pinctrl_dev **ptr;
> + struct pinctrl_dev *p;
> +
> + ptr = devres_alloc(devm_pinctrl_dev_release, sizeof(*ptr), GFP_KERNEL);
> + if (!ptr)
> + return -ENOMEM;
> +
> + p = pinctrl_init_controller(pctldesc, dev, driver_data);
> + if (IS_ERR(p)) {
> + devres_free(ptr);
> + return PTR_ERR(p);
> + }
> +
> + *ptr = p;
> + devres_add(dev, ptr);
> + *pctldev = p;
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(devm_pinctrl_register_and_init_nostart);
> +
> +int devm_pinctrl_start(struct device *dev,
> + struct pinctrl_dev *pctldev)
> +{
> + int error = 0;
> +
> + error = pinctrl_create_and_start(pctldev);
> + if (error) {
> + mutex_destroy(&pctldev->mutex);
> + return error;
> + }
> +
> + return error;
> +}
> +EXPORT_SYMBOL_GPL(devm_pinctrl_start);
> +
> /**
> * devm_pinctrl_unregister() - Resource managed version of pinctrl_unregister().
> * @dev: device for which which resource was allocated
> diff --git a/drivers/pinctrl/freescale/pinctrl-imx.c b/drivers/pinctrl/freescale/pinctrl-imx.c
> index a7ace9e..3644aed 100644
> --- a/drivers/pinctrl/freescale/pinctrl-imx.c
> +++ b/drivers/pinctrl/freescale/pinctrl-imx.c
> @@ -686,16 +686,6 @@ static int imx_pinctrl_probe_dt(struct platform_device *pdev,
> return 0;
> }
>
> -/*
> - * imx_free_resources() - free memory used by this driver
> - * @info: info driver instance
> - */
> -static void imx_free_resources(struct imx_pinctrl *ipctl)
> -{
> - if (ipctl->pctl)
> - pinctrl_unregister(ipctl->pctl);
> -}
> -
> int imx_pinctrl_probe(struct platform_device *pdev,
> struct imx_pinctrl_soc_info *info)
> {
> @@ -774,26 +764,30 @@ int imx_pinctrl_probe(struct platform_device *pdev,
> ipctl->info = info;
> ipctl->dev = info->dev;
> platform_set_drvdata(pdev, ipctl);
> - ret = devm_pinctrl_register_and_init(&pdev->dev,
> - imx_pinctrl_desc, ipctl,
> - &ipctl->pctl);
> +
> + ret = devm_pinctrl_register_and_init_nostart(&pdev->dev,
> + imx_pinctrl_desc, ipctl,
> + &ipctl->pctl);
> +
> if (ret) {
> dev_err(&pdev->dev, "could not register IMX pinctrl driver\n");
> - goto free;
> + return ret;
> }
>
> ret = imx_pinctrl_probe_dt(pdev, ipctl);
> if (ret) {
> dev_err(&pdev->dev, "fail to probe dt properties\n");
> - goto free;
> + return ret;
> + }
> +
> + ret = devm_pinctrl_start(&pdev->dev, ipctl->pctl);
> + if (ret) {
> + dev_err(&pdev->dev, "could not start IMX pinctrl driver\n");
> + return ret;
> }
>
> dev_info(&pdev->dev, "initialized IMX pinctrl driver\n");
>
> return 0;
>
> -free:
> - imx_free_resources(ipctl);
> -
> - return ret;
> }
> diff --git a/include/linux/pinctrl/pinctrl.h b/include/linux/pinctrl/pinctrl.h
> index 8ce2d87..e7020f0 100644
> --- a/include/linux/pinctrl/pinctrl.h
> +++ b/include/linux/pinctrl/pinctrl.h
> @@ -153,9 +153,17 @@ extern struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc,
> extern void pinctrl_unregister(struct pinctrl_dev *pctldev);
>
> extern int devm_pinctrl_register_and_init(struct device *dev,
> - struct pinctrl_desc *pctldesc,
> - void *driver_data,
> - struct pinctrl_dev **pctldev);
> + struct pinctrl_desc *pctldesc,
> + void *driver_data,
> + struct pinctrl_dev **pctldev);
> +
> +extern int devm_pinctrl_register_and_init_nostart(struct device *dev,
> + struct pinctrl_desc *pctldesc,
> + void *driver_data,
> + struct pinctrl_dev **pctldev);
> +
> +extern int devm_pinctrl_start(struct device *dev,
> + struct pinctrl_dev *pctldev);
>
> /* Please use devm_pinctrl_register_and_init() instead */
> extern struct pinctrl_dev *devm_pinctrl_register(struct device *dev,
Hi Linus,
On Tue, Mar 14, 2017 at 03:47:58PM +0100, Linus Walleij wrote:
> On Tue, Feb 28, 2017 at 7:00 AM, Mika Penttil?
> <[email protected]> wrote:
>
> > Recent pulls for mainline pre 4.11 introduced pinctrl setup changes and moved pinctrl-imx to
> > use generic helpers.
> >
> > Net effect was that hog group could not be resolved. I made it work for myself
> > with a two stage setup with create and start separated, and dt probe in between them.
> >
> >
> > Signed-off-by: Mika Penttil? <[email protected]>
>
> Sorry for including the whole mail body, some people may have missed the
> mail. Notably the i.MX maintainers.
>
> Your patch reminds me of the pinctrl_register() vs pinctrl_register_and_init()
> introduced by Tony Lindgren, can you look into this in commit
> 950b0d91dc108f54bccca5a2f75bb46f2df63d29
> "pinctrl: core: Fix regression caused by delayed work for hogs"?
>
> Does switching pinctrl_register_and_init() back to pinctrl_register()
> solve your problem?
>
> Gary: have you seen any problem like this?
Yes, Mika brought it up as soon as the first 4.11-rc appeared and indeed
this issue can be reproduced on any i.MX6 platform.
Then Tony offered a patch but you haven't replied to him yet:
https://lkml.org/lkml/2017/2/28/140
Regards,
Gary
* Linus Walleij <[email protected]> [170314 07:50]:
> On Tue, Feb 28, 2017 at 7:00 AM, Mika Penttilä
> <[email protected]> wrote:
>
> > Recent pulls for mainline pre 4.11 introduced pinctrl setup changes and moved pinctrl-imx to
> > use generic helpers.
> >
> > Net effect was that hog group could not be resolved. I made it work for myself
> > with a two stage setup with create and start separated, and dt probe in between them.
> >
> >
> > Signed-off-by: Mika Penttilä <[email protected]>
>
> Sorry for including the whole mail body, some people may have missed the
> mail. Notably the i.MX maintainers.
>
> Your patch reminds me of the pinctrl_register() vs pinctrl_register_and_init()
> introduced by Tony Lindgren, can you look into this in commit
> 950b0d91dc108f54bccca5a2f75bb46f2df63d29
> "pinctrl: core: Fix regression caused by delayed work for hogs"?
>
> Does switching pinctrl_register_and_init() back to pinctrl_register()
> solve your problem?
Hmm well I posted a suggested fix several days ago waiting for your
comments. Seems you're missing some emails you're being Cc:ed on?
Please check thread "[REGRESSION] pinctrl, of, unable to find hogs"
if you have it.
I basically split the functions further and was wondering if we
should bail out on pinctrl_register_and_init() type helpers in
favor of calling them separately because that still has this
issue.
Mika's devm_pinctrl_register_and_init_nostart() + start seems fine
with me too. We may still want to get rid of pinctrl_register_and_init()
though and replace it with devm_pinctrl_register_and_init_nostart() +
start.
Regards,
Tony
> Gary: have you seen any problem like this?
>
> Yours,
> Linus Walleij
>
>
> > ---
> >
> > diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
> > index d690465..33659c5a 100644
> > --- a/drivers/pinctrl/core.c
> > +++ b/drivers/pinctrl/core.c
> > @@ -2237,6 +2237,47 @@ int devm_pinctrl_register_and_init(struct device *dev,
> > }
> > EXPORT_SYMBOL_GPL(devm_pinctrl_register_and_init);
> >
> > +int devm_pinctrl_register_and_init_nostart(struct device *dev,
> > + struct pinctrl_desc *pctldesc,
> > + void *driver_data,
> > + struct pinctrl_dev **pctldev)
> > +{
> > + struct pinctrl_dev **ptr;
> > + struct pinctrl_dev *p;
> > +
> > + ptr = devres_alloc(devm_pinctrl_dev_release, sizeof(*ptr), GFP_KERNEL);
> > + if (!ptr)
> > + return -ENOMEM;
> > +
> > + p = pinctrl_init_controller(pctldesc, dev, driver_data);
> > + if (IS_ERR(p)) {
> > + devres_free(ptr);
> > + return PTR_ERR(p);
> > + }
> > +
> > + *ptr = p;
> > + devres_add(dev, ptr);
> > + *pctldev = p;
> > +
> > + return 0;
> > +}
> > +EXPORT_SYMBOL_GPL(devm_pinctrl_register_and_init_nostart);
> > +
> > +int devm_pinctrl_start(struct device *dev,
> > + struct pinctrl_dev *pctldev)
> > +{
> > + int error = 0;
> > +
> > + error = pinctrl_create_and_start(pctldev);
> > + if (error) {
> > + mutex_destroy(&pctldev->mutex);
> > + return error;
> > + }
> > +
> > + return error;
> > +}
> > +EXPORT_SYMBOL_GPL(devm_pinctrl_start);
> > +
> > /**
> > * devm_pinctrl_unregister() - Resource managed version of pinctrl_unregister().
> > * @dev: device for which which resource was allocated
> > diff --git a/drivers/pinctrl/freescale/pinctrl-imx.c b/drivers/pinctrl/freescale/pinctrl-imx.c
> > index a7ace9e..3644aed 100644
> > --- a/drivers/pinctrl/freescale/pinctrl-imx.c
> > +++ b/drivers/pinctrl/freescale/pinctrl-imx.c
> > @@ -686,16 +686,6 @@ static int imx_pinctrl_probe_dt(struct platform_device *pdev,
> > return 0;
> > }
> >
> > -/*
> > - * imx_free_resources() - free memory used by this driver
> > - * @info: info driver instance
> > - */
> > -static void imx_free_resources(struct imx_pinctrl *ipctl)
> > -{
> > - if (ipctl->pctl)
> > - pinctrl_unregister(ipctl->pctl);
> > -}
> > -
> > int imx_pinctrl_probe(struct platform_device *pdev,
> > struct imx_pinctrl_soc_info *info)
> > {
> > @@ -774,26 +764,30 @@ int imx_pinctrl_probe(struct platform_device *pdev,
> > ipctl->info = info;
> > ipctl->dev = info->dev;
> > platform_set_drvdata(pdev, ipctl);
> > - ret = devm_pinctrl_register_and_init(&pdev->dev,
> > - imx_pinctrl_desc, ipctl,
> > - &ipctl->pctl);
> > +
> > + ret = devm_pinctrl_register_and_init_nostart(&pdev->dev,
> > + imx_pinctrl_desc, ipctl,
> > + &ipctl->pctl);
> > +
> > if (ret) {
> > dev_err(&pdev->dev, "could not register IMX pinctrl driver\n");
> > - goto free;
> > + return ret;
> > }
> >
> > ret = imx_pinctrl_probe_dt(pdev, ipctl);
> > if (ret) {
> > dev_err(&pdev->dev, "fail to probe dt properties\n");
> > - goto free;
> > + return ret;
> > + }
> > +
> > + ret = devm_pinctrl_start(&pdev->dev, ipctl->pctl);
> > + if (ret) {
> > + dev_err(&pdev->dev, "could not start IMX pinctrl driver\n");
> > + return ret;
> > }
> >
> > dev_info(&pdev->dev, "initialized IMX pinctrl driver\n");
> >
> > return 0;
> >
> > -free:
> > - imx_free_resources(ipctl);
> > -
> > - return ret;
> > }
> > diff --git a/include/linux/pinctrl/pinctrl.h b/include/linux/pinctrl/pinctrl.h
> > index 8ce2d87..e7020f0 100644
> > --- a/include/linux/pinctrl/pinctrl.h
> > +++ b/include/linux/pinctrl/pinctrl.h
> > @@ -153,9 +153,17 @@ extern struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc,
> > extern void pinctrl_unregister(struct pinctrl_dev *pctldev);
> >
> > extern int devm_pinctrl_register_and_init(struct device *dev,
> > - struct pinctrl_desc *pctldesc,
> > - void *driver_data,
> > - struct pinctrl_dev **pctldev);
> > + struct pinctrl_desc *pctldesc,
> > + void *driver_data,
> > + struct pinctrl_dev **pctldev);
> > +
> > +extern int devm_pinctrl_register_and_init_nostart(struct device *dev,
> > + struct pinctrl_desc *pctldesc,
> > + void *driver_data,
> > + struct pinctrl_dev **pctldev);
> > +
> > +extern int devm_pinctrl_start(struct device *dev,
> > + struct pinctrl_dev *pctldev);
> >
> > /* Please use devm_pinctrl_register_and_init() instead */
> > extern struct pinctrl_dev *devm_pinctrl_register(struct device *dev,
* Gary Bisson <[email protected]> [170314 07:57]:
> Hi Linus,
>
> On Tue, Mar 14, 2017 at 03:47:58PM +0100, Linus Walleij wrote:
> > On Tue, Feb 28, 2017 at 7:00 AM, Mika Penttilä
> > <[email protected]> wrote:
> >
> > > Recent pulls for mainline pre 4.11 introduced pinctrl setup changes and moved pinctrl-imx to
> > > use generic helpers.
> > >
> > > Net effect was that hog group could not be resolved. I made it work for myself
> > > with a two stage setup with create and start separated, and dt probe in between them.
> > >
> > >
> > > Signed-off-by: Mika Penttilä <[email protected]>
> >
> > Sorry for including the whole mail body, some people may have missed the
> > mail. Notably the i.MX maintainers.
> >
> > Your patch reminds me of the pinctrl_register() vs pinctrl_register_and_init()
> > introduced by Tony Lindgren, can you look into this in commit
> > 950b0d91dc108f54bccca5a2f75bb46f2df63d29
> > "pinctrl: core: Fix regression caused by delayed work for hogs"?
> >
> > Does switching pinctrl_register_and_init() back to pinctrl_register()
> > solve your problem?
> >
> > Gary: have you seen any problem like this?
>
> Yes, Mika brought it up as soon as the first 4.11-rc appeared and indeed
> this issue can be reproduced on any i.MX6 platform.
>
> Then Tony offered a patch but you haven't replied to him yet:
> https://lkml.org/lkml/2017/2/28/140
I think as a regression fix for the -rc series, we should use Mika's
patch with the following tweaks:
1. Instead of adding yet another devm_pinctrl_register_and_init(),
let's just make devm_pinctrl_register_and_init() not call start
automatically. If people prefer to use Mika's naming for it
with nostart, I have no problem with that. But let's then rename
the current devm_pinctrl_register_and_init() so we are not stuck
with another interface with issues.
2. Update the four drivers using devm_pinctrl_register_and_init()
to also call start separately.
Mika, care to update your patch for that?
Regards,
Tony
On Wed, Mar 15, 2017 at 5:26 PM, Tony Lindgren <[email protected]> wrote:
> I think as a regression fix for the -rc series, we should use Mika's
> patch with the following tweaks:
>
> 1. Instead of adding yet another devm_pinctrl_register_and_init(),
> let's just make devm_pinctrl_register_and_init() not call start
> automatically. If people prefer to use Mika's naming for it
> with nostart, I have no problem with that. But let's then rename
> the current devm_pinctrl_register_and_init() so we are not stuck
> with another interface with issues.
>
> 2. Update the four drivers using devm_pinctrl_register_and_init()
> to also call start separately.
>
> Mika, care to update your patch for that?
OK sounds reasonable waiting for a revised patch from Mika.
Yours,
Linus Walleij