linux-kernel - Re: [PATCH 2/6] ASoC: amd: yc: Add a module parameter to influence pdm

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Date:   Fri, 27 Jan 2023 17:23:12 +0100
From:   Jaroslav Kysela <perex@...ex.cz>
To:     Mario Limonciello <mario.limonciello@....com>,
        Mukunda Vijendar <Vijendar.Mukunda@....com>,
        Saba Kareem Syed <Syed.SabaKareem@....com>,
        linux-kernel@...r.kernel.org
Cc:     Pananchikkal Renjith <Renjith.Pananchikkal@....com>,
        Mark Pearson <mpearson@...ovo.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>, Takashi Iwai <tiwai@...e.com>,
        alsa-devel@...a-project.org
Subject: Re: [PATCH 2/6] ASoC: amd: yc: Add a module parameter to influence
 pdm_gain

On 27. 01. 23 17:01, Mario Limonciello wrote:
> In case of regressions for any users that the new pdm_gain value is
> too high and for additional debugging, introduce a module parameter
> that would let them configure it.
> 
> Signed-off-by: Mario Limonciello <mario.limonciello@....com>
> ---
>   sound/soc/amd/yc/acp6x-pdm-dma.c | 7 ++++++-
>   sound/soc/amd/yc/acp6x.h         | 2 +-
>   2 files changed, 7 insertions(+), 2 deletions(-)

...

>   	pdm_ctrl = acp6x_readl(acp_base + ACP_WOV_MISC_CTRL);
> -	pdm_ctrl |= ACP_WOV_MISC_CTRL_MASK;
> +	pdm_ctrl |= FIELD_PREP(ACP_WOV_GAIN_CONTROL, pdm_gain);

The bits should be zeroed (AND - &) before OR to make sure that the correct 
value is written to the register. More related patches are affected.

>   	acp6x_writel(pdm_ctrl, acp_base + ACP_WOV_MISC_CTRL);

					Jaroslav

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