To enable aspect-ratio support in DRM, blindly exposing the aspect ratio information along with mode, can break things in existing non-atomic user-spaces which have no intention or support to use this aspect ratio information. To avoid this, a new drm client cap is required to enable a non-atomic user-space to advertise if it supports modes with aspect-ratio. Based on this cap value, the kernel will take a call on exposing the aspect ratio info in modes or not. This patch adds the client cap for aspect-ratio. Since no atomic-userspaces blow up on receiving aspect-ratio information, the client cap for aspect-ratio is always enabled for atomic clients. Cc: Ville Syrjala <ville.syrjala@linux.intel.com> Cc: Shashank Sharma <shashank.sharma@intel.com> Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com> V3: rebase V4: As suggested by Marteen Lankhorst modified the commit message explaining the need to use the DRM cap for aspect-ratio. Also, tweaked the comment lines in the code for better understanding and clarity, as recommended by Shashank Sharma. V5: rebase V6: rebase V7: rebase V8: rebase V9: rebase V10: rebase V11: rebase V12: As suggested by Daniel Vetter and Ville Syrjala, always enable aspect-ratio client cap for atomic userspaces, if no atomic userspace breaks on aspect-ratio bits. V13: rebase V14: rebase
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| @@ -680,6 +680,13 @@ struct drm_get_cap { · 679 unmodified lines | ||
| 680 | 680 | */ |
| 681 | 681 | #define DRM_CLIENT_CAP_ATOMIC 3 |
| 682 | 682 | |
| 683 | +/** | |
| 684 | + * DRM_CLIENT_CAP_ASPECT_RATIO | |
| 685 | + * | |
| 686 | + * If set to 1, the DRM core will provide aspect ratio information in modes. | |
| 687 | + */ | |
| 688 | +#define DRM_CLIENT_CAP_ASPECT_RATIO 4 | |
| 689 | + | |
| 683 | 690 | /** DRM_IOCTL_SET_CLIENT_CAP ioctl argument type */ |
| 684 | 691 | struct drm_set_client_cap { |
| 685 | 692 | __u64 capability; |