linux-kernel - Re: [alsa-devel] [PATCH v5 4/4] ASoC: codecs: add wsa881x amplifier support

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Date:   Thu, 29 Aug 2019 11:36:52 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        broonie@...nel.org, robh+dt@...nel.org, vkoul@...nel.org
Cc:     devicetree@...r.kernel.org, alsa-devel@...a-project.org,
        bgoswami@...eaurora.org, spapothi@...eaurora.org,
        lgirdwood@...il.com, linux-kernel@...r.kernel.org
Subject: Re: [alsa-devel] [PATCH v5 4/4] ASoC: codecs: add wsa881x amplifier
 support


> +static int wsa881x_ramp_pa_gain(struct snd_soc_component *comp,
> +				int min_gain, int max_gain, int udelay)
> +{
> +	int val;
> +
> +	for (val = min_gain; max_gain <= val; val--) {
> +		snd_soc_component_update_bits(comp, WSA881X_SPKR_DRV_GAIN,
> +					      0xF0, val << 4);
> +		/*
> +		 * 1ms delay is needed for every step change in gain as per
> +		 * HW requirement.
> +		 */
> +		usleep_range(udelay, udelay + 10);

nit-pick: it'd be nicer to have udelay explicitly set here instead of in 
the caller below for consistency with the comments.

> +			wsa881x_ramp_pa_gain(comp, min_gain, max_gain, 1000);

But apart from that I didn't see anything blatantly wrong, so

Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>