linux-kernel - Re: [PATCH] gpu/drm: mediatek: hdmi: check for valid modes on MT8167

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Date:   Mon, 12 Apr 2021 10:26:34 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Chun-Kuang Hu <chunkuang.hu@...nel.org>
Cc:     Philipp Zabel <p.zabel@...gutronix.de>,
        Matthias Brugger <matthias.bgg@...il.com>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Fabien Parent <fparent@...libre.com>
Subject: Re: [PATCH] gpu/drm: mediatek: hdmi: check for valid modes on MT8167

On 10/04/2021 00:41, Chun-Kuang Hu wrote:
> Hi, Neil:
> 
> Neil Armstrong <narmstrong@...libre.com> 於 2021年4月9日 週五 下午4:43寫道：
>>
>> On MT8167, only CEA modes and anything using a clock below 148500 is
>> supported for HDMI. This change adds some checks to make sure the
>> video format is OK for MT8167.
> 
> I think this patch should be separated to 3 patches. check CEA mode,
> check clock, add mt8167 hdmi support.

Ok

> 
>>
>> Signed-off-by: Fabien Parent <fparent@...libre.com>
>> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
>> ---
>>  drivers/gpu/drm/mediatek/mtk_hdmi.c | 17 +++++++++++++++++
>>  1 file changed, 17 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
>> index 8ee55f9e2954..991e2e935b93 100644
>> --- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
>> +++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
>> @@ -148,6 +148,8 @@ struct hdmi_audio_param {
>>
>>  struct mtk_hdmi_conf {
>>         bool tz_disabled;
>> +       unsigned long max_mode_clock;
>> +       bool cea_modes_only;
>>  };
>>
>>  struct mtk_hdmi {
>> @@ -1259,6 +1261,13 @@ static int mtk_hdmi_conn_mode_valid(struct drm_connector *conn,
>>                         return MODE_BAD;
>>         }
>>
>> +       if (hdmi->conf->cea_modes_only && !drm_match_cea_mode(mode))
>> +               return MODE_BAD;
>> +
>> +       if (hdmi->conf->max_mode_clock &&
>> +           mode->clock > hdmi->conf->max_mode_clock)
>> +               return MODE_CLOCK_HIGH;
>> +
>>         if (mode->clock < 27000)
>>                 return MODE_CLOCK_LOW;
>>         if (mode->clock > 297000)
>> @@ -1810,10 +1819,18 @@ static const struct mtk_hdmi_conf mtk_hdmi_conf_mt2701 = {
>>         .tz_disabled = true,
>>  };
>>
>> +static const struct mtk_hdmi_conf mtk_hdmi_conf_mt8167 = {
>> +       .max_mode_clock = 148500,
>> +       .cea_modes_only = true,
>> +};
>> +
>>  static const struct of_device_id mtk_drm_hdmi_of_ids[] = {
>>         { .compatible = "mediatek,mt2701-hdmi",
>>           .data = &mtk_hdmi_conf_mt2701,
>>         },
>> +       { .compatible = "mediatek,mt8167-hdmi",
> 
> "mediatek,mt8167-hdmi" does not exist in binding document, so add this
> to binding document first.
> In addition, could you also transfer mediatek,hdmi.txt to yaml format?

Sure

Thanks,
Neil

> 
> Regards,
> Chun-Kuang.
> 
>> +         .data = &mtk_hdmi_conf_mt8167,
>> +       },
>>         { .compatible = "mediatek,mt8173-hdmi",
>>         },
>>         {}
>> --
>> 2.25.1
>>