<html> <head> <meta content="text/html; charset=ISO-8859-1" http-equiv="Content-Type"> </head> <body bgcolor="#FFFFFF" text="#000000"> <tt>Chris,</tt><tt> </tt><tt> </tt><tt>This looks like a hw specific value which is difficult to understand. However, the definition of these </tt><tt>values are just a list of available options of z-order. On Intel VLV, there is only 6 options for the three planes Primary, Sprite A and Sprite B. Cursor is always on top. For example, "P1S1S2C1" means z-order (from bottom to top) of Primary -> Sprite A -> Sprite B -> Cursor. #define P1S1S2C1 0 #define P1S2S1C1 8 #define S2P1S1C1 1 #define S2S1P1C1 9 #define S1P1S2C1 4 #define S1S2P1C1 6 In theory, if hw supports, each CRTC may have their own plane z-order if user intentionally wants that happens. The pipe info (0 or 1) is packed into z-order value with extra bit (bit 31). Thanks, Alex</tt> On 14-03-04 12:20 AM, Chris Wilson wrote: > On Mon, Mar 03, 2014 at 02:12:28PM -0800, <a class="moz-txt-link-abbreviated" href="mailto:yu.dai@intel.com">yu.dai@intel.com</a> wrote: >> From: "Yu(Alex) Dai" <a class="moz-txt-link-rfc2396E" href="mailto:yu.dai@intel.com"><yu.dai@intel.com></a> >> >> Add "zorder" property to crtc to control Z-order of sprite and >> primary planes. The alpha channel of the planes can be enabled or >> disabled during Z-order change. > > Can I just say that is an abonimal user interface. You expect the > client to encode a hw specific value into a CRTC property that > affects global state. and given the two properties on the two CRTCs, > which should userspace believe? -Chris > </body> </html>