linux-kernel - Re: [PATCH v13 06/10] drm/mediatek: Add MT8195 External DisplayPort support

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Date:   Fri, 1 Jul 2022 10:14:02 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.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, ck.hu@...iatek.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 v13 06/10] drm/mediatek: Add MT8195 External DisplayPort
 support

Il 01/07/22 08:28, Bo-Chen Chen ha scritto:
> 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>
> ---
>   drivers/gpu/drm/mediatek/mtk_dp.c     | 197 +++++++++++++++++++++-----
>   drivers/gpu/drm/mediatek/mtk_dp_reg.h |   1 +
>   2 files changed, 161 insertions(+), 37 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_dp.c b/drivers/gpu/drm/mediatek/mtk_dp.c
> index b672d5a6f5bd..c3be97dd055c 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dp.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dp.c
> @@ -105,6 +105,7 @@ struct mtk_dp {
>   	struct regmap *regs;
>   
>   	bool enabled;
> +	bool has_fec;

You're introducing this has_fec variable here....

>   
>   	struct drm_connector *conn;
>   };


> @@ -1018,6 +1074,8 @@ static void mtk_dp_initialize_priv_data(struct mtk_dp *mtk_dp)
>   	mtk_dp->info.depth = DP_MSA_MISC_8_BPC;
>   	memset(&mtk_dp->info.timings, 0, sizeof(struct mtk_dp_timings));
>   	mtk_dp->info.timings.frame_rate = 60;
> +
> +	mtk_dp->has_fec = false;

.... setting it as false here ....

>   }
>   
>   static void mtk_dp_setup_tu(struct mtk_dp *mtk_dp)

> @@ -1498,15 +1562,38 @@ 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;
>   	u8 buf[DP_RECEIVER_CAP_SIZE] = {};
>   
> +	event = mtk_dp_plug_state(mtk_dp) ?
> +		connector_status_connected : connector_status_disconnected;
> +
> +	if (event < 0)
> +		return IRQ_HANDLED;
> +
> +	dev_info(mtk_dp->dev, "drm_helper_hpd_irq_event\n");

P.S.: This should be a dev_dbg().

> +	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);
> -		drm_dp_read_dpcd_caps(&mtk_dp->aux, buf);
> +		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);
> +			if (mtk_dp->has_fec)

...and you're checking it here, but there's nothing ever setting that as true!

Is there anything you forgot? :-)

Cheers,
Angelo