linux-kernel - Re: [PATCH AUTOSEL 5.4 08/35] ASoC: meson: g12a: add tohdmitx reset

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Date:   Sun, 22 Mar 2020 19:31:31 +0100
From:   Jerome Brunet <jbrunet@...libre.com>
To:     Sasha Levin <sashal@...nel.org>, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Cc:     Mark Brown <broonie@...nel.org>, alsa-devel@...a-project.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org,
        Kevin Hilman <khilman@...libre.com>
Subject: Re: [PATCH AUTOSEL 5.4 08/35] ASoC: meson: g12a: add tohdmitx reset


On Mon 16 Mar 2020 at 09:28, Jerome Brunet <jbrunet@...libre.com> wrote:

> On Mon 16 Mar 2020 at 03:33, Sasha Levin <sashal@...nel.org> wrote:
>
>> From: Jerome Brunet <jbrunet@...libre.com>
>>
>> [ Upstream commit 22946f37557e27697aabc8e4f62642bfe4a17fd8 ]
>>
>> Reset the g12a hdmi codec glue on probe. This ensure a sane startup state.
>>
>> Signed-off-by: Jerome Brunet <jbrunet@...libre.com>
>> Link: https://lore.kernel.org/r/20200221121146.1498427-1-jbrunet@baylibre.com
>> Signed-off-by: Mark Brown <broonie@...nel.org>
>> Signed-off-by: Sasha Levin <sashal@...nel.org>
>
> Hi Sasha,
>
> The tohdmitx reset property is not in the amlogic g12a DT in v5.4.
> Backporting this patch on v5.4 would break the hdmi sound, and probably
> the related sound card since the reset is not optional.
>
> Could you please drop this from v5.4 stable ?

Hi Sasha,

I just received a notification that this patch has been applied to 5.4
stable.

As explained above, it will cause a regression.
Could you please drop it from v5.4 stable ?

Thanks
Jerome

> It is ok to keep it for v5.5.
>
> Thanks
> Jerome
>
>> ---
>>  sound/soc/meson/g12a-tohdmitx.c | 6 ++++++
>>  1 file changed, 6 insertions(+)
>>
>> diff --git a/sound/soc/meson/g12a-tohdmitx.c b/sound/soc/meson/g12a-tohdmitx.c
>> index 9cfbd343a00c8..8a0db28a6a406 100644
>> --- a/sound/soc/meson/g12a-tohdmitx.c
>> +++ b/sound/soc/meson/g12a-tohdmitx.c
>> @@ -8,6 +8,7 @@
>>  #include <linux/module.h>
>>  #include <sound/pcm_params.h>
>>  #include <linux/regmap.h>
>> +#include <linux/reset.h>
>>  #include <sound/soc.h>
>>  #include <sound/soc-dai.h>
>>  
>> @@ -378,6 +379,11 @@ static int g12a_tohdmitx_probe(struct platform_device *pdev)
>>  	struct device *dev = &pdev->dev;
>>  	void __iomem *regs;
>>  	struct regmap *map;
>> +	int ret;
>> +
>> +	ret = device_reset(dev);
>> +	if (ret)
>> +		return ret;
>>  
>>  	regs = devm_platform_ioremap_resource(pdev, 0);
>>  	if (IS_ERR(regs))