linux-kernel - Aw: [PATCH v5 3/7] drm/mediatek: disable tmds on mt2701

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Date:   Fri, 21 Aug 2020 09:17:15 +0200
From:   Frank Wunderlich <frank-w@...lic-files.de>
To:     Frank Wunderlich <linux@...web.de>,
        chunkuang Hu <chunkuang.hu@...nel.org>
Cc:     linux-mediatek@...ts.infradead.org,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, Daniel Vetter <daniel@...ll.ch>,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Aw: [PATCH v5 3/7] drm/mediatek: disable tmds on mt2701

> diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi_phy.c b/drivers/gpu/drm/mediatek/mtk_hdmi_phy.c
> index 5223498502c4..edadb7a700f1 100644
> --- a/drivers/gpu/drm/mediatek/mtk_hdmi_phy.c
> +++ b/drivers/gpu/drm/mediatek/mtk_hdmi_phy.c
> @@ -184,6 +184,9 @@ static int mtk_hdmi_phy_probe(struct platform_device *pdev)
>  		return PTR_ERR(phy_provider);
>  	}
>
> +	if (hdmi_phy->conf->pll_default_off)
> +		hdmi_phy->conf->hdmi_phy_disable_tmds(hdmi_phy);
> +
>  	return of_clk_add_provider(dev->of_node, of_clk_src_simple_get,
>  				   hdmi_phy->pll);
>  }

tried modifying mtk_hdmi_phy_power_on using the new flag to not enable tmds instead of enabling and later disabling it, but this does not work...

--- a/drivers/gpu/drm/mediatek/mtk_hdmi_phy.c
+++ b/drivers/gpu/drm/mediatek/mtk_hdmi_phy.c
@@ -62,7 +62,8 @@ static int mtk_hdmi_phy_power_on(struct phy *phy)
        if (ret < 0)
                return ret;

-       hdmi_phy->conf->hdmi_phy_enable_tmds(hdmi_phy);
+       if (!hdmi_phy->conf->pll_default_off)
+               hdmi_phy->conf->hdmi_phy_enable_tmds(hdmi_phy);
        return 0;
 }

@@ -184,8 +185,8 @@ static int mtk_hdmi_phy_probe(struct platform_device *pdev)
                return PTR_ERR(phy_provider);
        }

-       if (hdmi_phy->conf->pll_default_off)
-               hdmi_phy->conf->hdmi_phy_disable_tmds(hdmi_phy);
+       //if (hdmi_phy->conf->pll_default_off)
+       //      hdmi_phy->conf->hdmi_phy_disable_tmds(hdmi_phy);

        return of_clk_add_provider(dev->of_node, of_clk_src_simple_get,
                                   hdmi_phy->pll);


same problem as without this Patch (horizontally distorted image flickering on 1280x1024)

any idea CK Hu?

regards Frank