From de12d44fcad409e1b2956ef0ffd48818423fc701 Mon Sep 17 00:00:00 2001 From: Jakob Bornecrantz Date: Tue, 4 Oct 2011 20:13:13 +0200 Subject: vmwgfx: Document vmw_fifo_reserve Signed-off-by: Jakob Bornecrantz Reviewed-by: Thomas Hellstrom Signed-off-by: Dave Airlie --- drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'drivers/gpu/drm/vmwgfx') diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c b/drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c index 3ba9cac579e0..881f67acc061 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c @@ -277,6 +277,16 @@ static int vmw_fifo_wait(struct vmw_private *dev_priv, return ret; } +/** + * Reserve @bytes number of bytes in the fifo. + * + * This function will return NULL (error) on two conditions: + * If it timeouts waiting for fifo space, or if @bytes is larger than the + * available fifo space. + * + * Returns: + * Pointer to the fifo, or null on error (possible hardware hang). + */ void *vmw_fifo_reserve(struct vmw_private *dev_priv, uint32_t bytes) { struct vmw_fifo_state *fifo_state = &dev_priv->fifo; -- cgit v1.2.3