linux-kernel - Re: [PATCH 0/4] Fix kcontrol put callback in Tegra drivers

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Message-ID: <8a00ea68-4859-fbcc-6292-909a66b0a188@perex.cz>
Date:   Wed, 3 Nov 2021 09:50:40 +0100
From:   Jaroslav Kysela <perex@...ex.cz>
To:     Sameer Pujar <spujar@...dia.com>, broonie@...nel.org,
        lgirdwood@...il.com, tiwai@...e.com
Cc:     thierry.reding@...il.com, jonathanh@...dia.com,
        alsa-devel@...a-project.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/4] Fix kcontrol put callback in Tegra drivers

On 03. 11. 21 6:04, Sameer Pujar wrote:
> This series fixes kcontrol put callback in some of the Tegra drivers
> which are used on platforms based on Tegra210 and later. The callback
> is expected to return 1 whenever the HW update is done.

The logic is a little bit another. The 1 means change, so you should compare 
the register / cached value and return 1 only when a different value is set. 
Your implementation invokes the change events for duplicate updates.

						Jaroslav

-- 
Jaroslav Kysela <perex@...ex.cz>
Linux Sound Maintainer; ALSA Project; Red Hat, Inc.