[PATCH] drm/drm_connector: add additional aspect ratio values

[Lin, Wayne]

________________________________
From: Ville Syrjälä <ville.syrjala at linux.intel.com>
Sent: Saturday, August 24, 2019 02:41
To: Lin, Wayne <Wayne.Lin at amd.com>
Cc: dri-devel at lists.freedesktop.org <dri-devel at lists.freedesktop.org>; amd-gfx at lists.freedesktop.org <amd-gfx at lists.freedesktop.org>; Li, Sun peng (Leo) <Sunpeng.Li at amd.com>; Kazlauskas, Nicholas <Nicholas.Kazlauskas at amd.com>
Subject: Re: [PATCH] drm/drm_connector: add additional aspect ratio values

On Thu, Aug 22, 2019 at 05:50:02PM -0400, Wayne Lin wrote:
> For HDMI2.0 CTS item - HF1-35, it verifies if the source generates
> video timing "64:27" video format correctly.
>
> eg: (vic-76) 1920x1080p at 60Hz,24bpp
>
> This patch add on "64:27" and "256:135" to drm_aspect_ratio_enum_list.
> Thereafter, one can specify the aspect ratio to "64:27" or "256:135"
> after creating aspect ratio property.
>
> Change-Id: Ifc9df54e8e8f78e70960fcd737a3a57e49c81152
> Signed-off-by: Wayne Lin <waynelin at amd.com>
> ---
>  drivers/gpu/drm/drm_connector.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
> index 3a0cacb71235..c0629a01d08e 100644
> --- a/drivers/gpu/drm/drm_connector.c
> +++ b/drivers/gpu/drm/drm_connector.c
> @@ -772,6 +772,8 @@ static const struct drm_prop_enum_list drm_aspect_ratio_enum_list[] = {
>        { DRM_MODE_PICTURE_ASPECT_NONE, "Automatic" },
>        { DRM_MODE_PICTURE_ASPECT_4_3, "4:3" },
>        { DRM_MODE_PICTURE_ASPECT_16_9, "16:9" },
> +     { DRM_MODE_PICTURE_ASPECT_64_27, "64:27" },
> +     { DRM_MODE_PICTURE_ASPECT_256_135, "256:135" },

> Not 100% sure we want to expose these via the property because the
> infoframe can't convey these independently from the VIC.

Agree with that it can't be independent from the VIC.
When building up hdmi avi infoframe by using "drm_hdmi_avi_infoframe_from_display_mode" in drm_edid,
it will refer to the VIC to set up the aspect ratio if the aspect ratio is not specified in mode.
However, if the aspect ratio is specified to a value other than none, current logic of code will use the specified value.

The main reason of this patch is for capable indicating the exact VIC wanted.
There are some modes defined in CTA-861 with same timing but different aspect ratio.
eg: VIC 103 & VIC 93
Without these new definitions, we cannot distinguish these different modes and might set a wrong VIC in AVI infoframe.

>  };
>
>  static const struct drm_prop_enum_list drm_content_type_enum_list[] = {
> --
> 2.17.1
>
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--
Ville Syrjälä
Intel
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