linux-kernel - Re: [RESEND PATCH] acpi: Add NHLT table signature

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Date:   Sat, 21 Mar 2020 11:35:59 +0100
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Cezary Rojewski <cezary.rojewski@...el.com>
Cc:     linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        erik.schmauss@...el.com, lenb@...nel.org, rafael@...nel.org,
        Erik Kaneda <erik.kaneda@...el.com>,
        Robert Moore <robert.moore@...el.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>
Subject: Re: [RESEND PATCH] acpi: Add NHLT table signature

On Friday, March 20, 2020 8:27:27 PM CET Cezary Rojewski wrote:
> NHLT (Non-HDAudio Link Table) provides configuration of audio
> endpoints for Intel SST (Smart Sound Technology) DSP products. Similarly
> to other ACPI tables, data provided by BIOS may not describe it
> correctly, thus overriding is required.
> 
> ACPI override mechanism checks for unknown signature before proceeding.
> Update known signatures array to support NHLT.
> 
> Cc: Erik Kaneda <erik.kaneda@...el.com>
> Cc: Robert Moore <robert.moore@...el.com>
> Cc: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> Signed-off-by: Cezary Rojewski <cezary.rojewski@...el.com>
> ---
>  drivers/acpi/tables.c | 2 +-
>  include/acpi/actbl2.h | 1 +
>  2 files changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c
> index 180ac4329763..0e905c3d1645 100644
> --- a/drivers/acpi/tables.c
> +++ b/drivers/acpi/tables.c
> @@ -501,7 +501,7 @@ static const char * const table_sigs[] = {
>  	ACPI_SIG_WDDT, ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT,
>  	ACPI_SIG_PSDT, ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT,
>  	ACPI_SIG_IORT, ACPI_SIG_NFIT, ACPI_SIG_HMAT, ACPI_SIG_PPTT,
> -	NULL };
> +	ACPI_SIG_NHLT, NULL };
>  
>  #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
>  
> diff --git a/include/acpi/actbl2.h b/include/acpi/actbl2.h
> index e45ced27f4c3..876ccf50ec36 100644
> --- a/include/acpi/actbl2.h
> +++ b/include/acpi/actbl2.h
> @@ -43,6 +43,7 @@
>  #define ACPI_SIG_SBST           "SBST"	/* Smart Battery Specification Table */
>  #define ACPI_SIG_SDEI           "SDEI"	/* Software Delegated Exception Interface Table */
>  #define ACPI_SIG_SDEV           "SDEV"	/* Secure Devices table */
> +#define ACPI_SIG_NHLT           "NHLT"	/* Non-HDAudio Link Table */
>  
>  /*
>   * All tables must be byte-packed to match the ACPI specification, since
> 

This should go in through the ACPICA upstream IMO.