linux-kernel - Re: [PATCH AUTOSEL 5.15 12/28] ASoC: rockchip: i2s: switch BCLK to GPIO

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Message-ID: <YtSVYq/47XmF6V0b@sashalap>
Date:   Sun, 17 Jul 2022 19:04:02 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     Chen-Yu Tsai <wenst@...omium.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Judy Hsiao <judyhsiao@...omium.org>,
        Mark Brown <broonie@...nel.org>, lgirdwood@...il.com,
        perex@...ex.cz, tiwai@...e.com, heiko@...ech.de,
        alsa-devel@...a-project.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH AUTOSEL 5.15 12/28] ASoC: rockchip: i2s: switch BCLK to
 GPIO

On Thu, Jul 14, 2022 at 12:29:27PM +0800, Chen-Yu Tsai wrote:
>Hi,
>
>On Thu, Jul 14, 2022 at 12:25 PM Sasha Levin <sashal@...nel.org> wrote:
>>
>> From: Judy Hsiao <judyhsiao@...omium.org>
>>
>> [ Upstream commit a5450aba737dae3ee1a64b282e609d8375d6700c ]
>>
>> We discoverd that the state of BCLK on, LRCLK off and SD_MODE on
>> may cause the speaker melting issue. Removing LRCLK while BCLK
>> is present can cause unexpected output behavior including a large
>> DC output voltage as described in the Max98357a datasheet.
>>
>> In order to:
>>   1. prevent BCLK from turning on by other component.
>>   2. keep BCLK and LRCLK being present at the same time
>>
>> This patch switches BCLK to GPIO func before LRCLK output, and
>> configures BCLK func back during LRCLK is output.
>>
>> Without this fix, BCLK is turned on 11 ms earlier than LRCK by the
>> da7219.
>> With this fix, BCLK is turned on only 0.4 ms earlier than LRCK by
>> the rockchip codec.
>>
>> Signed-off-by: Judy Hsiao <judyhsiao@...omium.org>
>> Link: https://lore.kernel.org/r/20220615045643.3137287-1-judyhsiao@chromium.org
>> Signed-off-by: Mark Brown <broonie@...nel.org>
>> Signed-off-by: Sasha Levin <sashal@...nel.org>
>
>Please drop this one from all stable branches. It caused more problems
>than it fixed and will be reverted for 5.19 [1]. The same patch, along
>with a proper follow-up fix, are queued up for 5.20.

Now dropped, thanks!

-- 
Thanks,
Sasha