Re: Wrong piix4_smbus address / slow trackpoint on Thinkpad P14s gen 2 (AMD)

From: Wolfram Sang <wsa@kernel.org>
To: "Miroslav Bendík" <miroslav.bendik@gmail.com>
Cc: linux-i2c@vger.kernel.org, linux-input@vger.kernel.org
Subject: Re: Wrong piix4_smbus address / slow trackpoint on Thinkpad P14s gen 2 (AMD)
Date: Thu, 6 Jan 2022 13:57:38 +0100	[thread overview]
Message-ID: <YdbnQjxBINyFIRsQ@ninjato> (raw)
In-Reply-To: <f8c13907-d296-baa6-7637-c5f8aa96b7ff@gmail.com>

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Hi again,

> Address detection does not work because cd6h/cd7h port io can be
> disabled, but it's accessible using mmio. This patch:
> https://lore.kernel.org/all/20210715221828.244536-1-Terry.Bowman@amd.com/
> with modified AMD_PCI_SMBUS_REVISION_MMIO fixed base address
> detection.

Okay, this patch is stalled because Terry is waiting for review
comments. I'll mention the high priority.

> Problem with RMI4 touchpad / trackpoint remains, because rmi4-smbus
> needs host notify feature. I have tried implement this feature,
> without success. Interrupts on IRQ 7 (SMBus) are generated only for
> block data transfers, but not for trackpoint / touchpad move actions.
> I have looked at pinctrl_amd and it looks, that activity is signaled
> using GPIO. This looks promising:

Isn't the interrupt described in the ACPI tables?

All the best,

   Wolfram

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