linux-kernel - Re: [PATCH v6 2/6] i3c: mipi-i3c-hci: Read HC_CONTROL_PIO

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Message-ID: <17e2bf2a-0c9d-4668-8f01-23651ce1970f@linux.intel.com>
Date: Mon, 2 Sep 2024 09:15:33 +0300
From: Jarkko Nikula <jarkko.nikula@...ux.intel.com>
To: Shyam Sundar S K <Shyam-sundar.S-k@....com>,
 Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc: Guruvendra Punugupati <Guruvendra.Punugupati@....com>,
 Krishnamoorthi M <krishnamoorthi.m@....com>, linux-i3c@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 2/6] i3c: mipi-i3c-hci: Read HC_CONTROL_PIO_MODE only
 after i3c hci v1.1

On 8/29/24 12:17 PM, Shyam Sundar S K wrote:
> The HC_CONTROL_PIO_MODE bit was introduced in the HC_CONTROL register
> starting from version 1.1. Therefore, checking the HC_CONTROL_PIO_MODE bit
> on hardware that adheres to older specification revisions (i.e., versions
> earlier than 1.1) is incorrect. To address this, add an additional check
> to read the HCI version before attempting to read the HC_CONTROL_PIO_MODE
> status.
> 
> Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@....com>
> ---
>   drivers/i3c/master/mipi-i3c-hci/core.c | 9 ++++++---
>   1 file changed, 6 insertions(+), 3 deletions(-)
> 
Reviewed-by: Jarkko Nikula <jarkko.nikula@...ux.intel.com>