linux-kernel - Re: [PATCH v2 2/5] drm/mediatek: fix boot up for 720 and 480 but 1080

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Message-ID: <CAAOTY__7wCeTm0OY0P1VKZp-r7+d7yj=LLb79Nzr1pVVkOjy2g@mail.gmail.com>
Date:   Sun, 2 Aug 2020 08:08:44 +0800
From:   Chun-Kuang Hu <chunkuang.hu@...nel.org>
To:     Frank Wunderlich <frank-w@...lic-files.de>
Cc:     "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Matthias Brugger <matthias.bgg@...il.com>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        chunhui dai <chunhui.dai@...iatek.com>
Subject: Re: [PATCH v2 2/5] drm/mediatek: fix boot up for 720 and 480 but 1080

Hi, Frank:

Frank Wunderlich <frank-w@...lic-files.de> 於 2020年7月28日 週二 下午7:19寫道：
>
> From: chunhui dai <chunhui.dai@...iatek.com>
>
> - disable tmds on phy on mt2701
> - support other resolutions like 1280x1024

If this patch does two things, it should be broken into two patches.

>
> without this Patch i see flickering on my TFT (1280x1024),
> so i guess clock is wrong.
>
> Signed-off-by: chunhui dai <chunhui.dai@...iatek.com>
> Signed-off-by: Frank Wunderlich <frank-w@...lic-files.de>
> Tested-by: Frank Wunderlich <frank-w@...lic-files.de>
> ---
>  drivers/gpu/drm/mediatek/mtk_hdmi_phy.c        | 3 +++
>  drivers/gpu/drm/mediatek/mtk_hdmi_phy.h        | 1 +
>  drivers/gpu/drm/mediatek/mtk_mt2701_hdmi_phy.c | 1 +
>  3 files changed, 5 insertions(+)
>
> 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);

I think every pll is default off, so you should turn on pll rather
than disable tmds.

Regards,
Chun-Kuang.

> +
>         return of_clk_add_provider(dev->of_node, of_clk_src_simple_get,
>                                    hdmi_phy->pll);
>  }
> diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi_phy.h b/drivers/gpu/drm/mediatek/mtk_hdmi_phy.h
> index 2d8b3182470d..f472fdeb63dc 100644
> --- a/drivers/gpu/drm/mediatek/mtk_hdmi_phy.h
> +++ b/drivers/gpu/drm/mediatek/mtk_hdmi_phy.h
> @@ -22,6 +22,7 @@ struct mtk_hdmi_phy;
>  struct mtk_hdmi_phy_conf {
>         bool tz_disabled;
>         unsigned long flags;
> +       bool pll_default_off;
>         const struct clk_ops *hdmi_phy_clk_ops;
>         void (*hdmi_phy_enable_tmds)(struct mtk_hdmi_phy *hdmi_phy);
>         void (*hdmi_phy_disable_tmds)(struct mtk_hdmi_phy *hdmi_phy);
> diff --git a/drivers/gpu/drm/mediatek/mtk_mt2701_hdmi_phy.c b/drivers/gpu/drm/mediatek/mtk_mt2701_hdmi_phy.c
> index d3cc4022e988..6fbedacfc1e8 100644
> --- a/drivers/gpu/drm/mediatek/mtk_mt2701_hdmi_phy.c
> +++ b/drivers/gpu/drm/mediatek/mtk_mt2701_hdmi_phy.c
> @@ -239,6 +239,7 @@ static void mtk_hdmi_phy_disable_tmds(struct mtk_hdmi_phy *hdmi_phy)
>  struct mtk_hdmi_phy_conf mtk_hdmi_phy_2701_conf = {
>         .tz_disabled = true,
>         .flags = CLK_SET_RATE_GATE,
> +       .pll_default_off = true,
>         .hdmi_phy_clk_ops = &mtk_hdmi_phy_pll_ops,
>         .hdmi_phy_enable_tmds = mtk_hdmi_phy_enable_tmds,
>         .hdmi_phy_disable_tmds = mtk_hdmi_phy_disable_tmds,
> --
> 2.25.1
>