linux-kernel - Re: [PATCH v5 5/5] drm: rockchip: add fixed screen size DVI-D support for rk3066 hdmi

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Date:   Sun, 31 Mar 2019 18:19:45 +0200
From:   Heiko Stuebner <heiko@...ech.de>
To:     Johan Jonker <jbx6244@...il.com>
Cc:     hjc@...k-chips.com, airlied@...ux.ie, daniel@...ll.ch,
        robh+dt@...nel.org, mark.rutland@....com,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 5/5] drm: rockchip: add fixed screen size DVI-D support for rk3066 hdmi

Hi Johan,

Am Donnerstag, 21. März 2019, 01:14:40 CEST schrieb Johan Jonker:
> Add fixed screen size DVI-D support
> for rk3066 hdmi with an extra patch.
> 
> Signed-off-by: Johan Jonker <jbx6244@...il.com>

> +static const struct drm_display_mode edid_cea_modes[] = {
> +	/* 4 - 1280x720@...z 16:9 */
> +	{ DRM_MODE("1280x720", DRM_MODE_TYPE_DRIVER, 74250, 1280, 1390,
> +		   1430, 1650, 0, 720, 725, 730, 750, 0,
> +		   DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC),
> +	  .vrefresh = 60, .picture_aspect_ratio = HDMI_PICTURE_ASPECT_16_9, },
> +};

you already dropped this patch from v6, but just for completeness sake,
I don't think there should be a static mode for dvi displays.

Similar to hdmi, dvi also can use ddc to read the monitor edid and some
sort of static mode might behave badly if for example a display with less
than this 720p is connected.

I think I remember reading in the Rockchip tree that they added that for
the case reading the edid fails, but if that happens the reading should
be fixed and not worked around a failure :-)


Heiko