linux-kernel - Re: [PATCH 6/6] i2c: designware: Use PCI PSP driver for communication

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Message-ID: <703033aa-1293-307d-42a2-9734a51c7190@linux.intel.com>
Date:   Thu, 16 Feb 2023 15:27:23 +0200
From:   Jarkko Nikula <jarkko.nikula@...ux.intel.com>
To:     Mario Limonciello <mario.limonciello@....com>,
        Jan Dąbroś <jsd@...ihalf.com>,
        Grzegorz Bernacki <gjb@...ihalf.com>,
        Thomas Rijo-john <Rijo-john.Thomas@....com>,
        Lendacky Thomas <Thomas.Lendacky@....com>,
        herbert@...dor.apana.org.au,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:     linux-i2c@...r.kernel.org, linux-crypto@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/6] i2c: designware: Use PCI PSP driver for communication

On 2/10/23 00:38, Mario Limonciello wrote:
> Currently the PSP semaphore communication base address is discovered
> by using an MSR that is not architecturally guaranteed for future
> platforms.  Also the mailbox that is utilized for communication with
> the PSP may have other consumers in the kernel, so it's better to
> make all communication go through a single driver.
> 
> Signed-off-by: Mario Limonciello <mario.limonciello@....com>
> ---
>   drivers/i2c/busses/Kconfig                  |   2 +-
>   drivers/i2c/busses/i2c-designware-amdpsp.c  | 141 +-------------------
>   drivers/i2c/busses/i2c-designware-core.h    |   1 -
>   drivers/i2c/busses/i2c-designware-platdrv.c |   1 -
>   include/linux/psp-platform-access.h         |   1 +
>   5 files changed, 9 insertions(+), 137 deletions(-)
> 
> diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
> index a7bfddf08fa7b..9e2202ca73ec7 100644
> --- a/drivers/i2c/busses/Kconfig
> +++ b/drivers/i2c/busses/Kconfig
> @@ -566,9 +566,9 @@ config I2C_DESIGNWARE_PLATFORM
>   
>   config I2C_DESIGNWARE_AMDPSP
>   	bool "AMD PSP I2C semaphore support"
> -	depends on X86_MSR
>   	depends on ACPI
>   	depends on I2C_DESIGNWARE_PLATFORM
> +	depends on CRYPTO_DEV_SP_PSP && !(I2C_DESIGNWARE_PLATFORM=y && CRYPTO_DEV_CCP_DD=m)
>   	help

Would this look better if split? I.e.

	depends on CRYPTO_DEV_SP_PSP
	depends on !(I2C_DESIGNWARE_PLATFORM=y && CRYPTO_DEV_CCP_DD=m)