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Message-ID: <4552aaf531b0619a2d7a7cc4bcf2d049c44b4b74.camel@kernel.org>
Subject: Re: [PATCH v2 06/12] drm/vc4: hdmi: Set HD_CTL_WHOLSMP and
 HD_CTL_CHALIGN_SET
From:   nicolas saenz julienne <nsaenz@kernel.org>
To:     Maxime Ripard <maxime@cerno.tech>,
        Jaroslav Kysela <perex@perex.cz>,
        Mark Brown <broonie@kernel.org>,
        dri-devel@lists.freedesktop.org,
        Daniel Vetter <daniel.vetter@intel.com>,
        David Airlie <airlied@linux.ie>,
        Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
        Thomas Zimmermann <tzimmermann@suse.de>,
        Liam Girdwood <lgirdwood@gmail.com>,
        Takashi Iwai <tiwai@suse.com>
Cc:     devicetree@vger.kernel.org,
        Dave Stevenson <dave.stevenson@raspberrypi.com>,
        Phil Elwell <phil@raspberrypi.com>,
        Tim Gover <tim.gover@raspberrypi.com>,
        Dom Cobley <dom@raspberrypi.com>, linux-doc@vger.kernel.org,
        Eric Anholt <eric@anholt.net>,
        Nicolas Saenz Julienne <nsaenzjulienne@suse.de>,
        linux-kernel@vger.kernel.org, alsa-devel@alsa-project.org,
        Maxime Ripard <mripard@kernel.org>,
        bcm-kernel-feedback-list@broadcom.com,
        linux-arm-kernel@lists.infradead.org,
        Daniel Vetter <daniel@ffwll.ch>,
        linux-rpi-kernel@lists.infradead.org,
        Jonathan Corbet <corbet@lwn.net>,
        Rob Herring <robh+dt@kernel.org>,
        Dom Cobley <popcornmix@gmail.com>
Date:   Tue, 01 Jun 2021 10:45:49 +0200
In-Reply-To: <20210525132354.297468-7-maxime@cerno.tech>
References: <20210525132354.297468-1-maxime@cerno.tech>
         <20210525132354.297468-7-maxime@cerno.tech>
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On Tue, 2021-05-25 at 15:23 +0200, Maxime Ripard wrote:
> From: Dom Cobley <popcornmix@gmail.com>
> 
> Symptom is random switching of speakers when using multichannel.
> 
> Repeatedly running speakertest -c8 occasionally starts with
> channels jumbled. This is fixed with HD_CTL_WHOLSMP.
> 
> The other bit looks beneficial and apears harmless in testing so
> I'd suggest adding it too.
> 
> Documentation says: HD_CTL_WHILSMP_SET
> Wait for whole sample. When this bit is set MAI transmit will start
> only when there is at least one whole sample available in the fifo.
> 
> Documentation says: HD_CTL_CHALIGN_SET
> Channel Align When Overflow. This bit is used to realign the audio
> channels in case of an overflow.
> If this bit is set, after the detection of an overflow, equal
> amount of dummy words to the missing words will be written to fifo,
> filling up the broken sample and maintaining alignment.
> 
> Signed-off-by: Dom Cobley <popcornmix@gmail.com>
> Signed-off-by: Maxime Ripard <maxime@cerno.tech>
> ---

Reviewed-by: Nicolas Saenz Julienne <nsaenz@kernel.org>

Regards,
Nicolas