linux-kernel - Re: [PATCH v3, 2/3] drm/mediatek: dp: Add the audio packet flag to mtk_dp

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Message-ID: <bddb1a1a445ead85056202c355627698051f12c9.camel@mediatek.com>
Date:   Wed, 26 Jul 2023 03:14:26 +0000
From:   CK Hu (胡俊光) <ck.hu@...iatek.com>
To:     Shuijing Li (李水静) 
        <Shuijing.Li@...iatek.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "chunkuang.hu@...nel.org" <chunkuang.hu@...nel.org>,
        Jitao Shi (石记涛) <jitao.shi@...iatek.com>,
        "daniel@...ll.ch" <daniel@...ll.ch>,
        "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
        "conor+dt@...nel.org" <conor+dt@...nel.org>,
        "airlied@...il.com" <airlied@...il.com>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "angelogioacchino.delregno@...labora.com" 
        <angelogioacchino.delregno@...labora.com>
CC:     "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Project_Global_Chrome_Upstream_Group 
        <Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: Re: [PATCH v3, 2/3] drm/mediatek: dp: Add the audio packet flag to
 mtk_dp_data struct

Hi, Shuijing:

On Thu, 2023-07-20 at 16:26 +0800, Shuijing Li wrote:
> The audio packet arrangement function is to only arrange audio.
> packets into the Hblanking area. In order to align with the HW
> default setting of mt8195, this function needs to be turned off.
> 
> Signed-off-by: Shuijing Li <shuijing.li@...iatek.com>
> Signed-off-by: Jitao Shi <jitao.shi@...iatek.com>
> ---
> Changes in v3:
> Separate these two things into two different patches.
> per suggestion from the previous thread:
> 
https://lore.kernel.org/lkml/e2ad22bcba31797f38a12a488d4246a01bf0cb2e.camel@mediatek.com/
> Changes in v2:
> - change the variables' name to be more descriptive
> - add a comment that describes the function of
> mtk_dp_audio_sample_arrange
> - reduce indentation by doing the inverse check
> - add a definition of some bits
> - add support for mediatek, mt8188-edp-tx
> per suggestion from the previous thread:
> 
https://lore.kernel.org/lkml/ac0fcec9-a2fe-06cc-c727-189ef7babe9c@collabora.com/
> ---
>  drivers/gpu/drm/mediatek/mtk_dp.c     | 40
> +++++++++++++++++++++++++++
>  drivers/gpu/drm/mediatek/mtk_dp_reg.h |  5 ++++
>  2 files changed, 45 insertions(+)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_dp.c
> b/drivers/gpu/drm/mediatek/mtk_dp.c
> index 64eee77452c0..d8cda83d6fef 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dp.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dp.c
> @@ -139,6 +139,7 @@ struct mtk_dp_data {
>  	unsigned int smc_cmd;
>  	const struct mtk_dp_efuse_fmt *efuse_fmt;
>  	bool audio_supported;
> +	bool audio_pkt_in_hblank_area;
>  };
>  
>  static const struct mtk_dp_efuse_fmt
> mt8195_edp_efuse_fmt[MTK_DP_CAL_MAX] = {
> @@ -1362,6 +1363,18 @@ static void
> mtk_dp_sdp_set_down_cnt_init_in_hblank(struct mtk_dp *mtk_dp)
>  			   SDP_DOWN_CNT_INIT_IN_HBLANK_DP_ENC1_P0_MASK)
> ;
>  }
>  
> +static void mtk_dp_audio_sample_arrange(struct mtk_dp *mtk_dp)
> +{
> +	/* arrange audio packets into the Hblanking and Vblanking area
> */
> +	if (!mtk_dp->data->audio_pkt_in_hblank_area)
> +		return;
> +
> +	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC1_P0_3374, 0,
> +			   SDP_ASP_INSERT_IN_HBLANK_DP_ENC1_P0_MASK);
> +	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC1_P0_3374, 0,
> +			   SDP_DOWN_ASP_CNT_INIT_DP_ENC1_P0_MASK);
> +}
> +
>  static void mtk_dp_setup_tu(struct mtk_dp *mtk_dp)
>  {
>  	u32 sram_read_start = min_t(u32,
> MTK_DP_TBC_BUF_READ_START_ADDR,
> @@ -1371,6 +1384,7 @@ static void mtk_dp_setup_tu(struct mtk_dp
> *mtk_dp)
>  				    MTK_DP_PIX_PER_ADDR);
>  	mtk_dp_set_sram_read_start(mtk_dp, sram_read_start);
>  	mtk_dp_setup_encoder(mtk_dp);
> +	mtk_dp_audio_sample_arrange(mtk_dp);
>  	mtk_dp_sdp_set_down_cnt_init_in_hblank(mtk_dp);
>  	mtk_dp_sdp_set_down_cnt_init(mtk_dp, sram_read_start);
>  }
> @@ -2616,11 +2630,28 @@ static int mtk_dp_resume(struct device *dev)
>  
>  static SIMPLE_DEV_PM_OPS(mtk_dp_pm_ops, mtk_dp_suspend,
> mtk_dp_resume);
>  
> +static const struct mtk_dp_data mt8188_edp_data = {
> +	.bridge_type = DRM_MODE_CONNECTOR_eDP,
> +	.smc_cmd = MTK_DP_SIP_ATF_EDP_VIDEO_UNMUTE,
> +	.efuse_fmt = mt8195_edp_efuse_fmt,
> +	.audio_supported = false,
> +	.audio_pkt_in_hblank_area = false,
> +};
> +
> +static const struct mtk_dp_data mt8188_dp_data = {
> +	.bridge_type = DRM_MODE_CONNECTOR_DisplayPort,
> +	.smc_cmd = MTK_DP_SIP_ATF_VIDEO_UNMUTE,
> +	.efuse_fmt = mt8195_dp_efuse_fmt,
> +	.audio_supported = true,
> +	.audio_pkt_in_hblank_area = true,
> +};
> +
>  static const struct mtk_dp_data mt8195_edp_data = {
>  	.bridge_type = DRM_MODE_CONNECTOR_eDP,
>  	.smc_cmd = MTK_DP_SIP_ATF_EDP_VIDEO_UNMUTE,
>  	.efuse_fmt = mt8195_edp_efuse_fmt,
>  	.audio_supported = false,
> +	.audio_pkt_in_hblank_area = false,

Global variable is default zero, so this modification is not necessary.

>  };
>  
>  static const struct mtk_dp_data mt8195_dp_data = {
> @@ -2628,9 +2659,18 @@ static const struct mtk_dp_data mt8195_dp_data
> = {
>  	.smc_cmd = MTK_DP_SIP_ATF_VIDEO_UNMUTE,
>  	.efuse_fmt = mt8195_dp_efuse_fmt,
>  	.audio_supported = true,
> +	.audio_pkt_in_hblank_area = false,
>  };
>  
>  static const struct of_device_id mtk_dp_of_match[] = {
> +	{
> +		.compatible = "mediatek,mt8188-edp-tx",
> +		.data = &mt8188_edp_data,

mt8188_edp_data is identical to mt8195_edp_data, so drop
mt8188_edp_data and use mt8188_edp_data here.

Regards,
CK

> +	},
> +	{
> +		.compatible = "mediatek,mt8188-dp-tx",
> +		.data = &mt8188_dp_data,
> +	},
>  	{
>  		.compatible = "mediatek,mt8195-edp-tx",
>  		.data = &mt8195_edp_data,
> diff --git a/drivers/gpu/drm/mediatek/mtk_dp_reg.h
> b/drivers/gpu/drm/mediatek/mtk_dp_reg.h
> index 84e38cef03c2..f38d6ff12afe 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dp_reg.h
> +++ b/drivers/gpu/drm/mediatek/mtk_dp_reg.h
> @@ -228,6 +228,11 @@
>  							 VIDEO_STABLE_C
> NT_THRD_DP_ENC1_P0 | \
>  							 SDP_DP13_EN_DP
> _ENC1_P0 | \
>  							 BS2BS_MODE_DP_
> ENC1_P0)
> +
> +#define MTK_DP_ENC1_P0_3374			0x3374
> +#define SDP_ASP_INSERT_IN_HBLANK_DP_ENC1_P0_MASK	BIT(12)
> +#define SDP_DOWN_ASP_CNT_INIT_DP_ENC1_P0_MASK		GENMASK
> (11, 0)
> +
>  #define MTK_DP_ENC1_P0_33F4			0x33f4
>  #define DP_ENC_DUMMY_RW_1_AUDIO_RST_EN			BIT(0)
>  #define DP_ENC_DUMMY_RW_1				BIT(9)