linux-kernel - Re: [PATCH] mfd: kempld-core: Check for DMI definition before ACPI

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Message-ID: <b9a01e2c8b54fbadfaff8d3a5888802ce4859ed4.camel@kontron.com>
Date:   Tue, 10 Nov 2020 15:41:47 +0000
From:   Michael Brunner <Michael.Brunner@...tron.com>
To:     "linux@...ck-us.net" <linux@...ck-us.net>,
        "lee.jones@...aro.org" <lee.jones@...aro.org>
CC:     "sameo@...ux.intel.com" <sameo@...ux.intel.com>,
        "mibru@....de" <mibru@....de>,
        "vkrasnov@....rtsoft.ru" <vkrasnov@....rtsoft.ru>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "mvanyulin@....rtsoft.ru" <mvanyulin@....rtsoft.ru>
Subject: Re: [PATCH] mfd: kempld-core: Check for DMI definition before ACPI

Hi Guenter,

thank you for the feedback! checkpatch didn't catch this.
I sent v2 of the patch.

Best regards,
  Michael

On Tue, 2020-11-10 at 06:39 -0800, Guenter Roeck wrote:
> On 11/9/20 11:46 PM, Michael Brunner wrote:
> > Change the detection order to priorize DMI table entries over
> > available
> > ACPI entries.
> > 
> > This makes it more easy for product developers to patch product
> > specific
> > handling into the driver.
> > Furthermore it allows to simplify the implementation a bit and
> > especially to remove the need to force synchronous probing.
> > 
> > Based on the following commit introduced with v5.10-rc1:
> > commit e8299c7313af ("mfd: Add ACPI support to Kontron PLD driver")
> > 
> > Signed-off-by: Michael Brunner <michael.brunner@...tron.com>
> > ---
> >  drivers/mfd/kempld-core.c | 23 ++---------------------
> >  1 file changed, 2 insertions(+), 21 deletions(-)
> > 
> > diff --git a/drivers/mfd/kempld-core.c b/drivers/mfd/kempld-core.c
> > index 2c9295953c11..aa7f386646a1 100644
> > --- a/drivers/mfd/kempld-core.c
> > +++ b/drivers/mfd/kempld-core.c
> > @@ -125,7 +125,6 @@ static const struct kempld_platform_data
> > kempld_platform_data_generic = {
> >  };
> >  
> >  static struct platform_device *kempld_pdev;
> > -static bool kempld_acpi_mode;
> >  
> >  static int kempld_create_platform_device(const struct
> > dmi_system_id *id)
> >  {
> > @@ -501,8 +500,6 @@ static int kempld_probe(struct platform_device
> > *pdev)
> >  		ret = kempld_get_acpi_data(pdev);
> >  		if (ret)
> >  			return ret;
> > -
> > -		kempld_acpi_mode = true;
> >  	} else if (kempld_pdev != pdev) {
> >  		/*
> >  		 * The platform device we are probing is not the one we
> > @@ -565,7 +562,6 @@ static struct platform_driver kempld_driver = {
> >  	.driver		= {
> >  		.name	= "kempld",
> >  		.acpi_match_table = ACPI_PTR(kempld_acpi_table),
> > -		.probe_type = PROBE_FORCE_SYNCHRONOUS,
> >  	},
> >  	.probe		= kempld_probe,
> >  	.remove		= kempld_remove,
> > @@ -884,7 +880,6 @@ MODULE_DEVICE_TABLE(dmi, kempld_dmi_table);
> >  static int __init kempld_init(void)
> >  {
> >  	const struct dmi_system_id *id;
> > -	int ret;
> >  
> >  	if (force_device_id[0]) {
> >  		for (id = kempld_dmi_table;
> > @@ -894,24 +889,10 @@ static int __init kempld_init(void)
> >  					break;
> >  		if (id->matches[0].slot == DMI_NONE)
> >  			return -ENODEV;
> > -	}
> > -
> > -	ret = platform_driver_register(&kempld_driver);
> > -	if (ret)
> > -		return ret;
> > -
> > -	/*
> > -	 * With synchronous probing the device should already be probed
> > now.
> > -	 * If no device id is forced and also no ACPI definition for
> > the
> > -	 * device was found, scan DMI table as fallback.
> > -	 *
> > -	 * If drivers_autoprobing is disabled and the device is found
> > here,
> > -	 * only that device can be bound manually later.
> > -	 */
> > -	if (!kempld_pdev && !kempld_acpi_mode)
> > +	} else
> 
> 	} else {
> >  		dmi_check_system(kempld_dmi_table);
> 	}
> 
> Guenter
> 
> >  
> > -	return 0;
> > +	return platform_driver_register(&kempld_driver);
> >  }
> >  
> >  static void __exit kempld_exit(void)
> >