linux-kernel - Re: [PATCH v3 3/6] platform/x86:intel/pmc: Improve function to show substate header

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Message-ID: <6690bc98-a396-0d8a-dae6-b141a8667585@linux.intel.com>
Date: Thu, 28 Aug 2025 16:09:11 +0300 (EEST)
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: Xi Pardee <xi.pardee@...ux.intel.com>
cc: irenic.rajneesh@...il.com, david.e.box@...ux.intel.com, 
    hdegoede@...hat.com, ilpo.jarvinen@...ux.intel.com, 
    platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org, 
    linux-pm@...r.kernel.org
Subject: Re: [PATCH v3 3/6] platform/x86:intel/pmc: Improve function to show
 substate header

On Fri, 15 Aug 2025, Xi Pardee wrote:

> Refactor pmc_core_substate_req_header_show() to accept a new argument.
> This is a preparation patch to introduce a new way to show Low Power
> Mode substate requirement data for platforms starting from Panther
> Lake. Increased the size for the name column as the Low Power Mode
> requirement register name is longer in newer platforms.
> 
> Signed-off-by: Xi Pardee <xi.pardee@...ux.intel.com>
> ---
>  drivers/platform/x86/intel/pmc/core.c | 22 ++++++++++++++++------
>  1 file changed, 16 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/platform/x86/intel/pmc/core.c b/drivers/platform/x86/intel/pmc/core.c
> index a1dd80bdbd413..cbfdcdc50ad21 100644
> --- a/drivers/platform/x86/intel/pmc/core.c
> +++ b/drivers/platform/x86/intel/pmc/core.c
> @@ -11,6 +11,11 @@
>  
>  #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
>  
> +enum header_type {
> +	HEADER_STATUS,
> +	HEADER_VALUE

Please have the comma in any non-terminating entry.

> +};
> +
>  #include <linux/bitfield.h>
>  #include <linux/debugfs.h>
>  #include <linux/delay.h>
> @@ -828,17 +833,22 @@ static int pmc_core_substate_l_sts_regs_show(struct seq_file *s, void *unused)
>  }
>  DEFINE_SHOW_ATTRIBUTE(pmc_core_substate_l_sts_regs);
>  
> -static void pmc_core_substate_req_header_show(struct seq_file *s, int pmc_index)
> +static void pmc_core_substate_req_header_show(struct seq_file *s, int pmc_index,
> +					      enum header_type type)
>  {
>  	struct pmc_dev *pmcdev = s->private;
>  	int mode;
>  
> -	seq_printf(s, "%30s |", "Element");
> +	seq_printf(s, "%40s |", "Element");
>  	pmc_for_each_mode(mode, pmcdev)
>  		seq_printf(s, " %9s |", pmc_lpm_modes[mode]);
>  
> -	seq_printf(s, " %9s |", "Status");
> -	seq_printf(s, " %11s |\n", "Live Status");
> +	if (type == HEADER_STATUS) {
> +		seq_printf(s, " %9s |", "Status");
> +		seq_printf(s, " %11s |\n", "Live Status");
> +	} else {
> +		seq_printf(s, " %9s |\n", "Value");
> +	}
>  }
>  
>  static int pmc_core_substate_req_regs_show(struct seq_file *s, void *unused)
> @@ -872,7 +882,7 @@ static int pmc_core_substate_req_regs_show(struct seq_file *s, void *unused)
>  			continue;
>  
>  		/* Display the header */
> -		pmc_core_substate_req_header_show(s, pmc_index);
> +		pmc_core_substate_req_header_show(s, pmc_index, HEADER_STATUS);
>  
>  		/* Loop over maps */
>  		for (mp = 0; mp < num_maps; mp++) {
> @@ -910,7 +920,7 @@ static int pmc_core_substate_req_regs_show(struct seq_file *s, void *unused)
>  				}
>  
>  				/* Display the element name in the first column */
> -				seq_printf(s, "pmc%d: %26s |", pmc_index, map[i].name);
> +				seq_printf(s, "pmc%d: %34s |", pmc_index, map[i].name);
>  
>  				/* Loop over the enabled states and display if required */
>  				pmc_for_each_mode(mode, pmcdev) {
> 

-- 
 i.