linux-kernel - Re: [PATCH v10 18/21] drm/mediatek: Add mt8195 Embedded DisplayPort driver

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Date:   Tue, 7 Jun 2022 16:01:25 +0800
From:   CK Hu <ck.hu@...iatek.com>
To:     Rex-BC Chen <rex-bc.chen@...iatek.com>,
        Guillaume Ranquet <granquet@...libre.com>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        "Philipp Zabel" <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        "Daniel Vetter" <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        "Krzysztof Kozlowski" <krzysztof.kozlowski+dt@...aro.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        "Kishon Vijay Abraham I" <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>, "Helge Deller" <deller@....de>,
        Jitao shi <jitao.shi@...iatek.com>
CC:     Markus Schneider-Pargmann <msp@...libre.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-phy@...ts.infradead.org>, <linux-fbdev@...r.kernel.org>
Subject: Re: [PATCH v10 18/21] drm/mediatek: Add mt8195 Embedded DisplayPort
 driver

Hi, Rex:

On Mon, 2022-05-23 at 12:47 +0200, Guillaume Ranquet wrote:
> From: Markus Schneider-Pargmann <msp@...libre.com>
> 
> This patch adds a DisplayPort driver for the Mediatek mt8195 SoC.
> 
> It supports the mt8195, the embedded DisplayPort units. It offers
> DisplayPort 1.4 with up to 4 lanes.
> 
> The driver creates a child device for the phy. The child device will
> never exist without the parent being active. As they are sharing a
> register range, the parent passes a regmap pointer to the child so
> that
> both can work with the same register range. The phy driver sets
> device
> data that is read by the parent to get the phy device that can be
> used
> to control the phy properties.
> 
> This driver is based on an initial version by
> Jason-JH.Lin <jason-jh.lin@...iatek.com>.
> 
> Signed-off-by: Markus Schneider-Pargmann <msp@...libre.com>
> Signed-off-by: Guillaume Ranquet <granquet@...libre.com>
> ---

[snip]

> +
> +static void mtk_dp_state_handler(struct mtk_dp *mtk_dp)
> +{
> +	switch (mtk_dp->state) {

Does mtk_dp->state has any relation with mtk_dp->train_state. If yes,
mix mtk_dp->state and mtk_dp->train_state into one state. If no, move
calling mtk_dp_state_handler() out of mtk_dp_train_handler().

Regards,
CK

> +	case MTK_DP_STATE_INITIAL:
> +		mtk_dp_video_mute(mtk_dp, true);
> +		mtk_dp->state = MTK_DP_STATE_IDLE;
> +		break;
> +
> +	case MTK_DP_STATE_IDLE:
> +		if (mtk_dp->train_state == MTK_DP_TRAIN_STATE_NORMAL)
> +			mtk_dp->state = MTK_DP_STATE_PREPARE;
> +		break;
> +
> +	case MTK_DP_STATE_PREPARE:
> +		mtk_dp_video_config(mtk_dp);
> +		mtk_dp_video_enable(mtk_dp, true);
> +
> +		mtk_dp->state = MTK_DP_STATE_NORMAL;
> +		break;
> +
> +	case MTK_DP_STATE_NORMAL:
> +		if (mtk_dp->train_state != MTK_DP_TRAIN_STATE_NORMAL) {
> +			mtk_dp_video_mute(mtk_dp, true);
> +			mtk_dp->state = MTK_DP_STATE_IDLE;
> +		}
> +		break;
> +
> +	default:
> +		break;
> +	}
> +}