linux-kernel - Re: [PATCH 3/3] Input: applespi: Add trace

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Message-ID: <YC176rlGQeyKuOpn@google.com>
Date:   Wed, 17 Feb 2021 12:26:18 -0800
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Ronald Tschalär <ronald@...ovation.ch>
Cc:     "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Sergiu Cuciurean <sergiu.cuciurean@...log.com>,
        Lee Jones <lee.jones@...aro.org>, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] Input: applespi: Add trace_event module param for
 early tracing.

Hi Ronald,

On Wed, Feb 17, 2021 at 11:07:18AM -0800, Ronald Tschalär wrote:
> The problem is that tracing can't be set via sysfs until the module is
> loaded, at which point the keyboard and trackpad initialization commands
> have already been run and hence tracing can't be used to debug problems
> here.
> 
> Adding this param allows tracing to be enabled for messages sent and
> received during module probing. It takes comma-separated list of events,
> e.g.
> 
>   trace_event=applespi_tp_ini_cmd,applespi_bad_crc

You can unbind and rebind a device to a driver via sysfs as many times
as needed (see bind and unbind driver sysfs attributes), so I believe

Thanks.

-- 
Dmitry