linux-kernel - Re: [PATCH v2 15/15] drm/mediatek: Introduce HDMI/DDC v2 for MT8195/MT8188

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Message-ID: <ae0a17c93131c22c18f0722c43d4770a652e2923.camel@mediatek.com>
Date: Tue, 10 Dec 2024 08:09:16 +0000
From: CK Hu (胡俊光) <ck.hu@...iatek.com>
To: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	"chunkuang.hu@...nel.org" <chunkuang.hu@...nel.org>
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	<mripard@...nel.org>, Jitao Shi (石记涛)
	<jitao.shi@...iatek.com>, "linux-mediatek@...ts.infradead.org"
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	<junzhi.zhao@...iatek.com>
Subject: Re: [PATCH v2 15/15] drm/mediatek: Introduce HDMI/DDC v2 for
 MT8195/MT8188

Hi, Angelo:

On Thu, 2024-12-05 at 12:45 +0100, AngeloGioacchino Del Regno wrote:
> External email : Please do not click links or open attachments until you have verified the sender or the content.
> 
> 
> Add support for the newer HDMI-TX (Encoder) v2 and DDC v2 IPs
> found in MediaTek's MT8195, MT8188 SoC and their variants, and
> including support for display modes up to 4k60 and for HDMI
> Audio, as per the HDMI 2.0 spec.
> 
> HDCP and CEC functionalities are also supported by this hardware,
> but are not included in this commit and that also poses a slight
> difference between the V2 and V1 controllers in how they handle
> Hotplug Detection (HPD).
> 
> While the v1 controller was using the CEC controller to check
> HDMI cable connection and disconnection, in this driver the v2
> one does not.
> 
> This is due to the fact that on parts with v2 designs, like the
> MT8195 SoC, there is one CEC controller shared between the HDMI
> Transmitter (HDMI-TX) and Receiver (HDMI-RX): before eventually
> adding support to use the CEC HW to wake up the HDMI controllers
> it is necessary to have support for one TX, one RX *and* for both
> at the same time.
> 
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> ---

[snip]

> +static u8 mtk_hdmi_v2_get_i2s_ch_mapping(struct mtk_hdmi *hdmi, u8 channel_type)

parameter hdmi is redundant, so drop it.

Regards,
CK

> +{
> +       switch (channel_type) {
> +       case HDMI_AUD_CHAN_TYPE_1_1:
> +       case HDMI_AUD_CHAN_TYPE_2_1:
> +               return 0x01;
> +       case HDMI_AUD_CHAN_TYPE_3_0:
> +               return 0x02;
> +       case HDMI_AUD_CHAN_TYPE_3_1:
> +               return 0x03;
> +       case HDMI_AUD_CHAN_TYPE_3_0_LRS:
> +       case HDMI_AUD_CHAN_TYPE_4_0:
> +               return 0x08;
> +       case HDMI_AUD_CHAN_TYPE_5_1:
> +               return 0x0b;
> +       case HDMI_AUD_CHAN_TYPE_4_1_CLRS:
> +       case HDMI_AUD_CHAN_TYPE_6_0:
> +       case HDMI_AUD_CHAN_TYPE_6_0_CS:
> +       case HDMI_AUD_CHAN_TYPE_6_0_CH:
> +       case HDMI_AUD_CHAN_TYPE_6_0_OH:
> +       case HDMI_AUD_CHAN_TYPE_6_0_CHR:
> +               return 0x0e;
> +       case HDMI_AUD_CHAN_TYPE_1_0:
> +       case HDMI_AUD_CHAN_TYPE_2_0:
> +       case HDMI_AUD_CHAN_TYPE_3_1_LRS:
> +       case HDMI_AUD_CHAN_TYPE_4_1:
> +       case HDMI_AUD_CHAN_TYPE_5_0:
> +       case HDMI_AUD_CHAN_TYPE_4_0_CLRS:
> +       case HDMI_AUD_CHAN_TYPE_6_1:
> +       case HDMI_AUD_CHAN_TYPE_6_1_CS:
> +       case HDMI_AUD_CHAN_TYPE_6_1_CH:
> +       case HDMI_AUD_CHAN_TYPE_6_1_OH:
> +       case HDMI_AUD_CHAN_TYPE_6_1_CHR:
> +       case HDMI_AUD_CHAN_TYPE_7_0:
> +       case HDMI_AUD_CHAN_TYPE_7_0_LH_RH:
> +       case HDMI_AUD_CHAN_TYPE_7_0_LSR_RSR:
> +       case HDMI_AUD_CHAN_TYPE_7_0_LC_RC:
> +       case HDMI_AUD_CHAN_TYPE_7_0_LW_RW:
> +       case HDMI_AUD_CHAN_TYPE_7_0_LSD_RSD:
> +       case HDMI_AUD_CHAN_TYPE_7_0_LSS_RSS:
> +       case HDMI_AUD_CHAN_TYPE_7_0_LHS_RHS:
> +       case HDMI_AUD_CHAN_TYPE_7_0_CS_CH:
> +       case HDMI_AUD_CHAN_TYPE_7_0_CS_OH:
> +       case HDMI_AUD_CHAN_TYPE_7_0_CS_CHR:
> +       case HDMI_AUD_CHAN_TYPE_7_0_CH_OH:
> +       case HDMI_AUD_CHAN_TYPE_7_0_CH_CHR:
> +       case HDMI_AUD_CHAN_TYPE_7_0_OH_CHR:
> +       case HDMI_AUD_CHAN_TYPE_7_0_LSS_RSS_LSR_RSR:
> +       case HDMI_AUD_CHAN_TYPE_8_0_LH_RH_CS:
> +       case HDMI_AUD_CHAN_TYPE_7_1:
> +       case HDMI_AUD_CHAN_TYPE_7_1_LH_RH:
> +       case HDMI_AUD_CHAN_TYPE_7_1_LSR_RSR:
> +       case HDMI_AUD_CHAN_TYPE_7_1_LC_RC:
> +       case HDMI_AUD_CHAN_TYPE_7_1_LW_RW:
> +       case HDMI_AUD_CHAN_TYPE_7_1_LSD_RSD:
> +       case HDMI_AUD_CHAN_TYPE_7_1_LSS_RSS:
> +       case HDMI_AUD_CHAN_TYPE_7_1_LHS_RHS:
> +       case HDMI_AUD_CHAN_TYPE_7_1_CS_CH:
> +       case HDMI_AUD_CHAN_TYPE_7_1_CS_OH:
> +       case HDMI_AUD_CHAN_TYPE_7_1_CS_CHR:
> +       case HDMI_AUD_CHAN_TYPE_7_1_CH_OH:
> +       case HDMI_AUD_CHAN_TYPE_7_1_CH_CHR:
> +       case HDMI_AUD_CHAN_TYPE_7_1_OH_CHR:
> +       case HDMI_AUD_CHAN_TYPE_7_1_LSS_RSS_LSR_RSR:
> +       default:
> +               return 0;
> +       }
> +
> +       return 0;
> +}
> +