Re: [PATCH] platform/x86: pmc_atom: use callback for all dmi quirk entries

From: Hans de Goede <hdegoede@redhat.com>
To: Henning Schild <henning.schild@siemens.com>
Cc: linux-kernel@vger.kernel.org, linux-leds@vger.kernel.org,
	platform-driver-x86@vger.kernel.org,
	linux-watchdog@vger.kernel.org,
	Srikanth Krishnakar <skrishnakar@gmail.com>,
	Jan Kiszka <jan.kiszka@siemens.com>,
	Gerd Haeussler <gerd.haeussler.ext@siemens.com>,
	Guenter Roeck <linux@roeck-us.net>,
	Wim Van Sebroeck <wim@linux-watchdog.org>,
	Mark Gross <mgross@linux.intel.com>, Pavel Machek <pavel@ucw.cz>,
	Andy Shevchenko <andy.shevchenko@gmail.com>
Subject: Re: [PATCH] platform/x86: pmc_atom: use callback for all dmi quirk entries
Date: Mon, 15 Mar 2021 19:01:13 +0100	[thread overview]
Message-ID: <43841119-4839-09d2-b606-7dd40cad4b89@redhat.com> (raw)
In-Reply-To: <20210315180011.6a3f60b0@md1za8fc.ad001.siemens.net>

Hi,

On 3/15/21 6:00 PM, Henning Schild wrote:
> Am Mon, 15 Mar 2021 17:31:49 +0100
> schrieb Hans de Goede <hdegoede@redhat.com>:
> 
>> Hi,
>>
>> On 3/15/21 3:58 PM, Henning Schild wrote:
>>> Introduce a global variable to remember the matching entry for later
>>> printing. Also having a callback allows to stop matching after the
>>> first hit.
>>>
>>> Signed-off-by: Henning Schild <henning.schild@siemens.com>
>>> ---
>>>  drivers/platform/x86/pmc_atom.c | 26 ++++++++++++++++++++------
>>>  1 file changed, 20 insertions(+), 6 deletions(-)
>>>
>>> diff --git a/drivers/platform/x86/pmc_atom.c
>>> b/drivers/platform/x86/pmc_atom.c index 38542d547f29..d0f74856cd8b
>>> 100644 --- a/drivers/platform/x86/pmc_atom.c
>>> +++ b/drivers/platform/x86/pmc_atom.c
>>> @@ -364,8 +364,16 @@ static void pmc_dbgfs_register(struct pmc_dev
>>> *pmc) #endif /* CONFIG_DEBUG_FS */
>>>  
>>>  static bool pmc_clk_is_critical = true;
>>> +static const struct dmi_system_id *dmi_critical;
>>>  
>>> -static int siemens_clk_is_critical(const struct dmi_system_id *d)
>>> +static int dmi_callback(const struct dmi_system_id *d)
>>> +{
>>> +	dmi_critical = d;  
>>
>> Don't introduce a global variable for this please. Instead just
>> directly print the ident of the matching dmi_system_id here.
> 
> Sorry, missed that part. Result looks nice and clean, thanks. I think i
> will squash it into 4/4 in v3 and not follow up here for now.

Ack, that sounds good to me.

Regards,

Hans

>>> +
>>> +	return 1;
>>> +}
>>> +
>>> +static int dmi_callback_siemens(const struct dmi_system_id *d)
>>>  {
>>>  	u32 st_id;
>>>  
>>> @@ -373,7 +381,7 @@ static int siemens_clk_is_critical(const struct
>>> dmi_system_id *d) goto out;
>>>  
>>>  	if (st_id == SIMATIC_IPC_IPC227E || st_id ==
>>> SIMATIC_IPC_IPC277E)
>>> -		return 1;
>>> +		return dmi_callback(d);
>>>  
>>>  out:
>>>  	pmc_clk_is_critical = false;
>>> @@ -388,6 +396,7 @@ static const struct dmi_system_id
>>> critclk_systems[] = { {
>>>  		/* pmc_plt_clk0 is used for an external HSIC USB
>>> HUB */ .ident = "MPL CEC1x",
>>> +		.callback = dmi_callback,
>>>  		.matches = {
>>>  			DMI_MATCH(DMI_SYS_VENDOR, "MPL AG"),
>>>  			DMI_MATCH(DMI_PRODUCT_NAME, "CEC10
>>> Family"), @@ -396,6 +405,7 @@ static const struct dmi_system_id
>>> critclk_systems[] = { {
>>>  		/* pmc_plt_clk0 - 3 are used for the 4 ethernet
>>> controllers */ .ident = "Lex 3I380D",
>>> +		.callback = dmi_callback,
>>>  		.matches = {
>>>  			DMI_MATCH(DMI_SYS_VENDOR, "Lex BayTrail"),
>>>  			DMI_MATCH(DMI_PRODUCT_NAME, "3I380D"),
>>> @@ -404,6 +414,7 @@ static const struct dmi_system_id
>>> critclk_systems[] = { {
>>>  		/* pmc_plt_clk* - are used for ethernet
>>> controllers */ .ident = "Lex 2I385SW",
>>> +		.callback = dmi_callback,
>>>  		.matches = {
>>>  			DMI_MATCH(DMI_SYS_VENDOR, "Lex BayTrail"),
>>>  			DMI_MATCH(DMI_PRODUCT_NAME, "2I385SW"),
>>> @@ -412,6 +423,7 @@ static const struct dmi_system_id
>>> critclk_systems[] = { {
>>>  		/* pmc_plt_clk* - are used for ethernet
>>> controllers */ .ident = "Beckhoff CB3163",
>>> +		.callback = dmi_callback,
>>>  		.matches = {
>>>  			DMI_MATCH(DMI_SYS_VENDOR, "Beckhoff
>>> Automation"), DMI_MATCH(DMI_BOARD_NAME, "CB3163"),
>>> @@ -420,6 +432,7 @@ static const struct dmi_system_id
>>> critclk_systems[] = { {
>>>  		/* pmc_plt_clk* - are used for ethernet
>>> controllers */ .ident = "Beckhoff CB4063",
>>> +		.callback = dmi_callback,
>>>  		.matches = {
>>>  			DMI_MATCH(DMI_SYS_VENDOR, "Beckhoff
>>> Automation"), DMI_MATCH(DMI_BOARD_NAME, "CB4063"),
>>> @@ -428,6 +441,7 @@ static const struct dmi_system_id
>>> critclk_systems[] = { {
>>>  		/* pmc_plt_clk* - are used for ethernet
>>> controllers */ .ident = "Beckhoff CB6263",
>>> +		.callback = dmi_callback,
>>>  		.matches = {
>>>  			DMI_MATCH(DMI_SYS_VENDOR, "Beckhoff
>>> Automation"), DMI_MATCH(DMI_BOARD_NAME, "CB6263"),
>>> @@ -436,13 +450,14 @@ static const struct dmi_system_id
>>> critclk_systems[] = { {
>>>  		/* pmc_plt_clk* - are used for ethernet
>>> controllers */ .ident = "Beckhoff CB6363",
>>> +		.callback = dmi_callback,
>>>  		.matches = {
>>>  			DMI_MATCH(DMI_SYS_VENDOR, "Beckhoff
>>> Automation"), DMI_MATCH(DMI_BOARD_NAME, "CB6363"),
>>>  		},
>>>  	},
>>>  	{
>>> -		.callback = siemens_clk_is_critical,
>>> +		.callback = dmi_callback_siemens,
>>>  		.ident = "SIEMENS AG",
>>>  		.matches = {
>>>  			DMI_MATCH(DMI_SYS_VENDOR, "SIEMENS AG"),
>>> @@ -457,7 +472,6 @@ static int pmc_setup_clks(struct pci_dev *pdev,
>>> void __iomem *pmc_regmap, {
>>>  	struct platform_device *clkdev;
>>>  	struct pmc_clk_data *clk_data;
>>> -	const struct dmi_system_id *d;
>>>  
>>>  	clk_data = kzalloc(sizeof(*clk_data), GFP_KERNEL);
>>>  	if (!clk_data)
>>> @@ -468,8 +482,8 @@ static int pmc_setup_clks(struct pci_dev *pdev,
>>> void __iomem *pmc_regmap, if (dmi_check_system(critclk_systems)) {
>>>  		clk_data->critical = pmc_clk_is_critical;
>>>  		if (clk_data->critical) {
>>> -			d = dmi_first_match(critclk_systems);
>>> -			pr_info("%s critclks quirk enabled\n",
>>> d->ident);
>>> +			pr_info("%s critclks quirk enabled\n",
>>> +				dmi_critical->ident);
>>>  		}
>>>  	}
>>>  
>>>   
>>
> 