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

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Date:   Tue, 16 Mar 2021 06:47:43 +0100
From:   Henning Schild <henning.schild@...mens.com>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-leds@...r.kernel.org,
        platform-driver-x86@...r.kernel.org,
        linux-watchdog@...r.kernel.org,
        Srikanth Krishnakar <skrishnakar@...il.com>,
        Jan Kiszka <jan.kiszka@...mens.com>,
        Gerd Haeussler <gerd.haeussler.ext@...mens.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Mark Gross <mgross@...ux.intel.com>,
        Pavel Machek <pavel@....cz>,
        Andy Shevchenko <andy.shevchenko@...il.com>
Subject: Re: [PATCH] platform/x86: pmc_atom: use callback for all dmi quirk
 entries

Hoi Hans,

on a slighly different but also related topic. Did you ever come across
SMSC SCH5347? Seems to be pretty similar to 56xx, only with spec non
public ... and probably less often in use
Maybe you happen to have code, or know the differences. We already have
it working with a modified copy of sch56xx but that is still rough and
i thought i ask before we potentially duplicate work.

groetjes,
Henning

Am Mon, 15 Mar 2021 19:01:13 +0100
schrieb Hans de Goede <hdegoede@...hat.com>:

> 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@...hat.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@...mens.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);
> >>>  		}
> >>>  	}
> >>>  
> >>>     
> >>  
> >   
>