Re: [PATCH libdrm 07/11] xf86drmMode.h: Add DisplayPort MST encoder type

[Laurent Pinchart <laurent.pinchart@ideasonboard.com>]

Hi Thierry,

Thank you for the patch.

On Friday 23 January 2015 17:08:20 Thierry Reding wrote:
> From: Thierry Reding <treding@nvidia.com>
> 
> This brings xf86drmMode.h in sync with include/drm/drm_mode.h.
> Eventually we really should only have a single set of definitions rather
> than duplicating this in two files.

The purpose of these duplicate definitions is to avoid application build 
breakages when compiled against an old drm.h header that doesn't include 
drm_modes.h. Given that drm_modes.h has been introduced in 2.6.39 more than 6 
years ago, wouldn't it be time to drop this ?

If we need to support old distributions (such as RHEL 5 for instance) shipping 
kernel headers older than 2.6.39, do we still need to keep the definitions in 
sync with newer kernel headers ? Build breakages would only occur when 
compiling an application that makes use of the new definitions against old 
kernel headers. If the distribution is stuck on <2.6.39 I doubt it will ship 
applications using recent DRM features.

> Signed-off-by: Thierry Reding <treding@nvidia.com>
> ---
>  xf86drmMode.h | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/xf86drmMode.h b/xf86drmMode.h
> index e70c16d437f4..70f14a1ae506 100644
> --- a/xf86drmMode.h
> +++ b/xf86drmMode.h
> @@ -130,6 +130,7 @@ extern "C" {
>  #define DRM_MODE_ENCODER_TVDAC   4
>  #define DRM_MODE_ENCODER_VIRTUAL 5
>  #define DRM_MODE_ENCODER_DSI     6
> +#define DRM_MODE_ENCODER_DPMST   7
> 
>  #define DRM_MODE_SUBCONNECTOR_Automatic 0
>  #define DRM_MODE_SUBCONNECTOR_Unknown   0

-- 
Regards,

Laurent Pinchart

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