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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 Reviewed-by: Shashank Sharma <shashank.sharma@intel.com> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/1525777785-9740-7-git-send-email-ankit.k.nautiyal@intel.com
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.