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

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Date:   Thu, 16 Feb 2023 07:29:53 -0600
From:   Mario Limonciello <mario.limonciello@....com>
To:     Jarkko Nikula <jarkko.nikula@...ux.intel.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 2/16/23 07:27, Jarkko Nikula wrote:
> 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)
Yes, thanks I'll change that for next version.