linux-kernel - Re: [PATCH v14 06/10] drm/mediatek: Add MT8195 External DisplayPort support

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Date:   Mon, 25 Jul 2022 17:51:11 +0800
From:   CK Hu <ck.hu@...iatek.com>
To:     Bo-Chen Chen <rex-bc.chen@...iatek.com>, <chunkuang.hu@...nel.org>,
        <p.zabel@...gutronix.de>, <daniel@...ll.ch>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <mripard@...nel.org>,
        <tzimmermann@...e.de>, <matthias.bgg@...il.com>, <deller@....de>,
        <airlied@...ux.ie>
CC:     <msp@...libre.com>, <granquet@...libre.com>,
        <jitao.shi@...iatek.com>, <wenst@...omium.org>,
        <angelogioacchino.delregno@...labora.com>,
        <liangxu.xu@...iatek.com>, <dri-devel@...ts.freedesktop.org>,
        <linux-mediatek@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-fbdev@...r.kernel.org>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: Re: [PATCH v14 06/10] drm/mediatek: Add MT8195 External DisplayPort
 support

Hi, Bo-Chen:

On Tue, 2022-07-12 at 19:12 +0800, Bo-Chen Chen wrote:
> From: Guillaume Ranquet <granquet@...libre.com>
> 
> This patch adds External DisplayPort support to the mt8195 eDP
> driver.
> 
> Signed-off-by: Guillaume Ranquet <granquet@...libre.com>
> Signed-off-by: Bo-Chen Chen <rex-bc.chen@...iatek.com>
> ---

[snip]

> @@ -1489,13 +1543,34 @@ static int mtk_dp_init_port(struct mtk_dp
> *mtk_dp)
>  static irqreturn_t mtk_dp_hpd_event_thread(int hpd, void *dev)
>  {
>  	struct mtk_dp *mtk_dp = dev;
> +	int event;
> +
> +	event = mtk_dp_plug_state(mtk_dp) ?
> +		connector_status_connected :
> connector_status_disconnected;
> +
> +	if (event < 0)
> +		return IRQ_HANDLED;

event is useless, so drop it.

Regards,
CK

> +
> +	dev_dbg(mtk_dp->dev, "drm_helper_hpd_irq_event\n");
> +	drm_helper_hpd_irq_event(mtk_dp->bridge.dev);
>  
>  	if (mtk_dp->train_info.cable_state_change) {
>  		mtk_dp->train_info.cable_state_change = false;
>  
> -		mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
> -				   DP_PWR_STATE_BANDGAP_TPLL_LANE,
> -				   DP_PWR_STATE_MASK);
> +		if (!mtk_dp->train_info.cable_plugged_in) {
> +			mtk_dp_video_mute(mtk_dp, true);
> +
> +			mtk_dp_initialize_priv_data(mtk_dp);
> +			mtk_dp_set_idle_pattern(mtk_dp, true);
> +
> +			mtk_dp_update_bits(mtk_dp,
> MTK_DP_TOP_PWR_STATE,
> +					   DP_PWR_STATE_BANDGAP_TPLL,
> +					   DP_PWR_STATE_MASK);
> +		} else {
> +			mtk_dp_update_bits(mtk_dp,
> MTK_DP_TOP_PWR_STATE,
> +					   DP_PWR_STATE_BANDGAP_TPLL_LA
> NE,
> +					   DP_PWR_STATE_MASK);
> +		}
>  	}
>  
>  	if (mtk_dp->train_info.irq_sta.hpd_inerrupt) {
> @@ -1597,6 +1672,24 @@ static int mtk_dp_dt_parse(struct mtk_dp
> *mtk_dp,
>  	return 0;
>  }
>