linux-kernel - Re: [PATCH 2/3] platform/x86: ISST : Check major minor version

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Message-ID: <9d9d1c7e-482b-8817-a09b-9ce364a74cf@linux.intel.com>
Date:   Fri, 29 Sep 2023 17:33:01 +0300 (EEST)
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
cc:     Hans de Goede <hdegoede@...hat.com>, markgross@...nel.org,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        platform-driver-x86@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] platform/x86: ISST : Check major minor version

Also the shortlog could be improved, IMO. E.g., Ignore minor version 
mismatch.

-- 
 i.

On Fri, 29 Sep 2023, Ilpo Järvinen wrote:

> On Mon, 25 Sep 2023, Srinivas Pandruvada wrote:
> 
> > Parse major and minor version number from the version field. If there
> > is a mismatch for major version, exit from further processing for that
> > domain.
> > 
> > If there is mismatch in minor version, driver continue to process with
> > an error message.
> 
> This sentence sounds odd.
> 
> > Minor version change doesn't change offsets and bit
> > structures of TPMI fields.
> > 
> > Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
> > ---
> >  .../x86/intel/speed_select_if/isst_tpmi_core.c   | 16 ++++++++++++----
> >  1 file changed, 12 insertions(+), 4 deletions(-)
> > 
> > diff --git a/drivers/platform/x86/intel/speed_select_if/isst_tpmi_core.c b/drivers/platform/x86/intel/speed_select_if/isst_tpmi_core.c
> > index 63faa2ea8327..37f17e229419 100644
> > --- a/drivers/platform/x86/intel/speed_select_if/isst_tpmi_core.c
> > +++ b/drivers/platform/x86/intel/speed_select_if/isst_tpmi_core.c
> > @@ -30,7 +30,8 @@
> >  #include "isst_if_common.h"
> >  
> >  /* Supported SST hardware version by this driver */
> > -#define ISST_HEADER_VERSION		1
> > +#define ISST_MAJOR_VERSION	0
> > +#define ISST_MINOR_VERSION	1
> >  
> >  /*
> >   * Used to indicate if value read from MMIO needs to get multiplied
> > @@ -352,12 +353,19 @@ static int sst_main(struct auxiliary_device *auxdev, struct tpmi_per_power_domai
> >  	pd_info->sst_header.cp_offset *= 8;
> >  	pd_info->sst_header.pp_offset *= 8;
> >  
> > -	if (pd_info->sst_header.interface_version != ISST_HEADER_VERSION) {
> > -		dev_err(&auxdev->dev, "SST: Unsupported version:%x\n",
> > -			pd_info->sst_header.interface_version);
> > +	if (pd_info->sst_header.interface_version == TPMI_VERSION_INVALID)
> > +		return -ENODEV;
> > +
> > +	if (TPMI_MAJOR_VERSION(pd_info->sst_header.interface_version) != ISST_MAJOR_VERSION) {
> > +		dev_err(&auxdev->dev, "SST: Unsupported major version:%lx\n",
> > +			TPMI_MAJOR_VERSION(pd_info->sst_header.interface_version));
> >  		return -ENODEV;
> >  	}
> >  
> > +	if (TPMI_MINOR_VERSION(pd_info->sst_header.interface_version) != ISST_MINOR_VERSION)
> > +		dev_err(&auxdev->dev, "SST: Ignore: Unsupported minor version:%lx\n",
> > +			TPMI_MINOR_VERSION(pd_info->sst_header.interface_version));
> 
> Why is this dev_err(), wouldn't dev_info() be more appropriate since 
> after this patch it's no longer an error?
> 
> > +
> >  	/* Read SST CP Header */
> >  	*((u64 *)&pd_info->cp_header) = readq(pd_info->sst_base + pd_info->sst_header.cp_offset);
> >  
> > 
> 
>