drm: Add DRM client cap for aspect-ratio

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

diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
index eadeabc..0d4cfb2 100644 (file)
--- a/drivers/gpu/drm/drm_ioctl.c
+++ b/drivers/gpu/drm/drm_ioctl.c
@@ -324,6 +324,15 @@ drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
                        return -EINVAL;
                file_priv->atomic = req->value;
                file_priv->universal_planes = req->value;
+               /*
+                * No atomic user-space blows up on aspect ratio mode bits.
+                */
+               file_priv->aspect_ratio_allowed = req->value;
+               break;
+       case DRM_CLIENT_CAP_ASPECT_RATIO:
+               if (req->value > 1)
+                       return -EINVAL;
+               file_priv->aspect_ratio_allowed = req->value;
                break;
        default:
                return -EINVAL;

diff --git a/include/drm/drm_file.h b/include/drm/drm_file.h
index 99ab50c..91a65a3 100644 (file)
--- a/include/drm/drm_file.h
+++ b/include/drm/drm_file.h
@@ -181,6 +181,14 @@ struct drm_file {
        unsigned atomic:1;
 
        /**
+        * @aspect_ratio_allowed:
+        *
+        * True, if client can handle picture aspect ratios, and has requested
+        * to pass this information along with the mode.
+        */
+       unsigned aspect_ratio_allowed:1;
+
+       /**
         * @is_master:
         *
         * This client is the creator of @master. Protected by struct

diff --git a/include/uapi/drm/drm.h b/include/uapi/drm/drm.h
index 6fdff59..9c660e1 100644 (file)
--- a/include/uapi/drm/drm.h
+++ b/include/uapi/drm/drm.h
@@ -680,6 +680,13 @@ struct drm_get_cap {
  */
 #define DRM_CLIENT_CAP_ATOMIC  3
 
+/**
+ * DRM_CLIENT_CAP_ASPECT_RATIO
+ *
+ * If set to 1, the DRM core will provide aspect ratio information in modes.
+ */
+#define DRM_CLIENT_CAP_ASPECT_RATIO    4
+
 /** DRM_IOCTL_SET_CLIENT_CAP ioctl argument type */
 struct drm_set_client_cap {
        __u64 capability;