linux-kernel - Re: [PATCH v3 08/12] drm/mediatek: hdmi: v2: add audio support

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Message-ID: <5895f15f-44ae-6164-77dd-c9bae5436a47@collabora.com>
Date:   Mon, 7 Nov 2022 12:09:33 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Guillaume Ranquet <granquet@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Jitao shi <jitao.shi@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Vinod Koul <vkoul@...nel.org>, CK Hu <ck.hu@...iatek.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Kishon Vijay Abraham I <kishon@...com>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, stuart.lee@...iatek.com,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org, devicetree@...r.kernel.org,
        mac.shen@...iatek.com, linux-phy@...ts.infradead.org
Subject: Re: [PATCH v3 08/12] drm/mediatek: hdmi: v2: add audio support

Il 04/11/22 15:09, Guillaume Ranquet ha scritto:
> Add HDMI audio support for v2
> 
> Signed-off-by: Guillaume Ranquet <granquet@...libre.com>
> ---
>   drivers/gpu/drm/mediatek/mtk_hdmi_common.c |   1 +
>   drivers/gpu/drm/mediatek/mtk_hdmi_ddc_v2.c |   2 +-
>   drivers/gpu/drm/mediatek/mtk_hdmi_v2.c     | 213 +++++++++++++++++++++++++++++
>   drivers/gpu/drm/mediatek/mtk_hdmi_v2.h     |   2 +
>   4 files changed, 217 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi_common.c b/drivers/gpu/drm/mediatek/mtk_hdmi_common.c
> index e43c938a9aa5..1ea91f8bb6c7 100644
> --- a/drivers/gpu/drm/mediatek/mtk_hdmi_common.c
> +++ b/drivers/gpu/drm/mediatek/mtk_hdmi_common.c
> @@ -386,6 +386,7 @@ static const struct mtk_hdmi_conf mtk_hdmi_conf_v2 = {
>   	.mtk_hdmi_output_init = mtk_hdmi_output_init_v2,
>   	.mtk_hdmi_clk_disable = mtk_hdmi_clk_disable_v2,
>   	.mtk_hdmi_clk_enable = mtk_hdmi_clk_enable_v2,
> +	.set_hdmi_codec_pdata = set_hdmi_codec_pdata_v2,

Keep naming consistent please:

	.mtk_hdmi_set_codec_pdata = mtk_hdmi_set_codec_pdata_v2,

>   	.mtk_hdmi_clock_names = mtk_hdmi_clk_names_v2,
>   	.num_clocks = MTK_HDMIV2_CLK_COUNT,
>   };
> diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi_ddc_v2.c b/drivers/gpu/drm/mediatek/mtk_hdmi_ddc_v2.c
> index 61696d255e51..26456802a5c4 100644
> --- a/drivers/gpu/drm/mediatek/mtk_hdmi_ddc_v2.c
> +++ b/drivers/gpu/drm/mediatek/mtk_hdmi_ddc_v2.c
> @@ -309,7 +309,7 @@ static int mtk_hdmi_ddc_probe(struct platform_device *pdev)
>   	ddc->regs = device_node_to_regmap(hdmi);
>   	of_node_put(hdmi);
>   	if (IS_ERR(ddc->regs))
> -		return dev_err_probe(dev, PTR_ERR(ddc->regs), "Unable to get mt8195-hdmi syscon");
> +		return dev_err_probe(dev, PTR_ERR(ddc->regs), "Unable to get hdmi syscon");

You might as well do the rename in the commit that actually introduces this file,
since you're doing that in the same series.

Please do so.

>   
>   	ddc->clk = devm_clk_get_enabled(dev, "ddc");
>   	if (IS_ERR(ddc->clk))
> diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi_v2.c b/drivers/gpu/drm/mediatek/mtk_hdmi_v2.c
> index e8457429964d..b391b22fa9f5 100644
> --- a/drivers/gpu/drm/mediatek/mtk_hdmi_v2.c
> +++ b/drivers/gpu/drm/mediatek/mtk_hdmi_v2.c
> @@ -211,6 +211,26 @@ static void mtk_hdmi_hw_vid_black(struct mtk_hdmi *hdmi, bool black)
>   		mtk_hdmi_mask(hdmi, TOP_VMUTE_CFG1, 0, REG_VMUTE_EN);
>   }
>   
> +static void mtk_hdmi_hw_aud_mute(struct mtk_hdmi *hdmi)
> +{
> +	u32 val;
> +
> +	val = mtk_hdmi_read(hdmi, AIP_CTRL, &val);
> +
> +	if (val & DSD_EN)
> +		mtk_hdmi_mask(hdmi, AIP_TXCTRL,
> +			      DSD_MUTE_DATA | AUD_MUTE_FIFO_EN,

I think I already gave you some advice to shorten this in an earlier
series version.

Besides, you can also use the FIELD_PREP() macro here, and please use it.

P.S.:
val = FIELD_PREP(... something AUD_MUTE_FIFO_EN);
if (val & DSD_EN)
	val |= FIELD_PREP( ... something DSD_MUTE_DATA)

mtk_hdmi_mask(hdmi, AIP_TXCTRL, val, val);

> +			      DSD_MUTE_DATA | AUD_MUTE_FIFO_EN);
> +	else
> +		mtk_hdmi_mask(hdmi, AIP_TXCTRL, AUD_MUTE_FIFO_EN,
> +			      AUD_MUTE_FIFO_EN);
> +}
> +
> +static void mtk_hdmi_hw_aud_unmute(struct mtk_hdmi *hdmi)
> +{
> +	mtk_hdmi_mask(hdmi, AIP_TXCTRL, AUD_MUTE_DIS, AUD_MUTE_FIFO_EN);
> +}
> +
>   static void mtk_hdmi_hw_reset(struct mtk_hdmi *hdmi)
>   {
>   	mtk_hdmi_mask(hdmi, HDMITX_CONFIG, 0x0, HDMITX_SW_RSTB);
> @@ -889,6 +909,7 @@ static void mtk_hdmi_audio_reset(struct mtk_hdmi *hdmi, bool rst)

..snip..

> @@ -935,6 +957,28 @@ static void mtk_hdmi_reset_colorspace_setting(struct mtk_hdmi *hdmi)
>   	hdmi->ycc_quantization_range = HDMI_YCC_QUANTIZATION_RANGE_LIMITED;
>   }
>   
> +static void mtk_hdmi_audio_enable(struct mtk_hdmi *hdmi)

These two functions are used only in one function (each)... so you don't
need them. Just move the two lines in mtk_hdmi_audio_startup() ...

> +{
> +	mtk_hdmi_aud_enable_packet(hdmi, true);
> +	hdmi->audio_enable = true;
> +}
> +
> +static void mtk_hdmi_audio_disable(struct mtk_hdmi *hdmi)
> +{

... and in mtk_hdmi_audio_shutdown().

> +	mtk_hdmi_aud_enable_packet(hdmi, false);
> +	hdmi->audio_enable = false;
> +}
> +
> +static void mtk_hdmi_audio_set_param(struct mtk_hdmi *hdmi,
> +				     struct hdmi_audio_param *param)
> +{
> +	if (!hdmi->audio_enable)
> +		return;
> +
> +	memcpy(&hdmi->aud_param, param, sizeof(*param));
> +	mtk_hdmi_aud_output_config(hdmi, &hdmi->mode);
> +}
> +
>   static void mtk_hdmi_change_video_resolution(struct mtk_hdmi *hdmi)
>   {
>   	bool is_over_340M = false;

..snip..


> +
> +static int mtk_hdmi_audio_mute(struct device *dev, void *data, bool enable,
> +			       int direction)
> +{
> +	struct mtk_hdmi *hdmi = dev_get_drvdata(dev);
> +
> +	if (direction != SNDRV_PCM_STREAM_PLAYBACK)

Why aren't you returning an error here?

If this is really supposed to be like that, please add a comment in the code
explaining the reason, so that the next person reading this won't mistakenly
change that.

> +		return 0;
> +
> +	if (enable)
> +		mtk_hdmi_hw_aud_mute(hdmi);
> +	else
> +		mtk_hdmi_hw_aud_unmute(hdmi);
> +
> +	return 0;
> +}
> +

Regards,
Angelo