From 497a3ff9877424108020c7091c7886b364c0486e Mon Sep 17 00:00:00 2001 From: Jakob Bornecrantz Date: Tue, 4 Oct 2011 20:13:14 +0200 Subject: [PATCH] vmwgfx: Add comments for buffer pinning code Signed-off-by: Jakob Bornecrantz Reviewed-by: Thomas Hellstrom Signed-off-by: Dave Airlie --- drivers/gpu/drm/vmwgfx/vmwgfx_kms.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c index 1a4c84cecca7..c14eb764e096 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c @@ -706,6 +706,10 @@ static struct drm_framebuffer_funcs vmw_framebuffer_dmabuf_funcs = { .create_handle = vmw_framebuffer_create_handle, }; +/** + * We need to reserve the start of vram because the host might + * scribble to it at mode changes, so we need to reserve it. + */ static int vmw_surface_dmabuf_pin(struct vmw_framebuffer *vfb) { struct vmw_private *dev_priv = vmw_priv(vfb->base.dev); @@ -729,6 +733,9 @@ static int vmw_surface_dmabuf_pin(struct vmw_framebuffer *vfb) return ret; } +/** + * See vmw_surface_dmabuf_pin. + */ static int vmw_surface_dmabuf_unpin(struct vmw_framebuffer *vfb) { struct ttm_buffer_object *bo; @@ -745,6 +752,9 @@ static int vmw_surface_dmabuf_unpin(struct vmw_framebuffer *vfb) return 0; } +/** + * Pin the dmabuffer to the start of vram. + */ static int vmw_framebuffer_dmabuf_pin(struct vmw_framebuffer *vfb) { struct vmw_private *dev_priv = vmw_priv(vfb->base.dev); -- 2.39.5