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a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=62HsBMsR0K1XYhez3cyuww5t6C5JPcJi30pomEYqZJs=; b=opEWnhGUcCi3PJesv8co6f4w1GLY9LZedQYXFt47ZCP3ACzYzjwaQw7Q5Pl6uJuVjo 6sazBIwzxA8Wy4El852RYK7TDTIOmB9/01CyAz294IG4o2xIIsX4yX5frr4fETA0lMuK O5Tl7GmOyNhNi4Qm8DJpzUIBXeB1pmiSoWBQRy/4pUAd3v55Z42uU6wY4lPBxFqxVSAG nFjq0URdRTT2z//QZ0ojQiAdguVhFaFfdJWU59rtszVgr7bA5eEDvmKg6en4nkw/IADo xfyWGFTnlRYv2NFAhUbQsNPtd2qZUCsmeR2dRwUsk2UAKr30feZzLvxVDrYzDZRamCYL W7ZA== X-Gm-Message-State: APjAAAV5Cyzst4IhVjWn/wmDy0GngTZ1fBayXKaEqAjlP3EZR/+AuyOL x3H0ACUjardHeAIcLS+bdBMODAW8ImED X-Google-Smtp-Source: APXvYqzaUpQWNwgXMQ6tYQPALrnlWkyxLkiAxk+FyrtQ/cSKY2BTjDCKml1cEXoxis9xj67lVmijVdRMJ7Sp X-Received: by 2002:a63:201b:: with SMTP id g27mr14261230pgg.56.1574407890148; Thu, 21 Nov 2019 23:31:30 -0800 (PST) Date: Fri, 22 Nov 2019 15:31:12 +0800 In-Reply-To: <20191122073114.219945-1-tzungbi@google.com> Message-Id: <20191122073114.219945-2-tzungbi@google.com> Mime-Version: 1.0 References: <20191122073114.219945-1-tzungbi@google.com> X-Mailer: git-send-email 2.24.0.432.g9d3f5f5b63-goog From: Tzung-Bi Shih To: broonie@kernel.org, pierre-louis.bossart@linux.intel.com Cc: tzungbi@google.com, alsa-devel@alsa-project.org, dgreid@google.com, cychiang@google.com Subject: [alsa-devel] [PATCH v2 1/3] ASoC: max98090: remove msleep in PLL unlocked workaround X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" It was observed Baytrail-based chromebooks could cause continuous PLL unlocked when using playback stream and capture stream simultaneously. Specifically, starting a capture stream after started a playback stream. As a result, the audio data could corrupt or turn completely silent. As the datasheet suggested, the maximum PLL lock time should be 7 msec. The workaround resets the codec softly by toggling SHDN off and on if PLL failed to lock for 10 msec. Notably, there is no suggested hold time for SHDN off. On Baytrail-based chromebooks, it would easily happen continuous PLL unlocked if there is a 10 msec delay between SHDN off and on. Removes the msleep(). Signed-off-by: Tzung-Bi Shih --- sound/soc/codecs/max98090.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/sound/soc/codecs/max98090.c b/sound/soc/codecs/max98090.c index f6bf4cfbea23..12cb87c0d463 100644 --- a/sound/soc/codecs/max98090.c +++ b/sound/soc/codecs/max98090.c @@ -2114,10 +2114,16 @@ static void max98090_pll_work(struct work_struct *work) dev_info_ratelimited(component->dev, "PLL unlocked\n"); + /* + * As the datasheet suggested, the maximum PLL lock time should be + * 7 msec. The workaround resets the codec softly by toggling SHDN + * off and on if PLL failed to lock for 10 msec. Notably, there is + * no suggested hold time for SHDN off. + */ + /* Toggle shutdown OFF then ON */ snd_soc_component_update_bits(component, M98090_REG_DEVICE_SHUTDOWN, M98090_SHDNN_MASK, 0); - msleep(10); snd_soc_component_update_bits(component, M98090_REG_DEVICE_SHUTDOWN, M98090_SHDNN_MASK, M98090_SHDNN_MASK); -- 2.24.0.432.g9d3f5f5b63-goog _______________________________________________ Alsa-devel mailing list Alsa-devel@alsa-project.org https://mailman.alsa-project.org/mailman/listinfo/alsa-devel