On Tue, Sep 17, 2013 at 12:54:09PM +0300, Ville Syrjälä wrote:
On Tue, Sep 17, 2013 at 10:03:12AM +0100, Damien Lespiau wrote:
On Tue, Sep 17, 2013 at 11:20:46AM +0300, Ville Syrjälä wrote:
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -2131,6 +2131,17 @@ int drm_mode_setcrtc(struct drm_device *dev, void *data, goto out; }
/** Do not allow the use of framebuffers consisting of multiple* buffers with stereo modes until all the details API details* are fleshed out (eg. interaction with drm_planes, switch* between a 1 buffers and a 2 buffers fb, ...)*/if (fb->num_buffers > 1 && drm_mode_is_stereo(mode)) {ret = -EINVAL;goto out;}This would prevent planar buffers in stereo modes. I'm think we just ignore the matter for now and let drivers deal with it. We don't have enough handles anyway for planar stereo, so maybe we even want to add separate left/right fb attachment properties to the planes instead of tying it up in inside a single fb. Or we cook up addfb3 when we hit this problem for real. I think we'd anyway need some kind of flag for the fb if it contains both left and right buffers.
I'm quite happy to ignore 3 planes YUV stereo fbs for now :) (2 planes YUV stereo fbs still fit!).
Are you fine with this test though, or do you mean ignore the whole matter of forbidding this case (or just the multiplane stereo fb case)? I was just thinking that I missed the addition of this check in the page flip ioctl.
Yeah, I was thinking we that we can ignore this issue for now, and so we wouldn't need the check. Currently for non-stereo cases the only thing we check is that there is a valid handle for each plane. If userspace passes more handles, we simply ignore the extra ones.
I guess we should start to check that. For 3d framebuffers with 2 separate buffer handles for each plane I think we need to add another flag to addfb2, e.g.
#define DRM_MODE_FB_3D_2_FRAMES (1<<1) /* separate left/right buffers, doubles plane count */
and then also throw in the respective check code into the core that userspace supplies sufficient amounts of buffers in framebuffer_check() by adjusting drM_format_num_planes and drm_format_plane_cpp. -Daniel