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

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Date:   Mon, 16 Mar 2020 09:28:11 +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 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 ?
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))