Quoting Pandiyan, Dhinakaran (2017-09-14 08:20:21) > > On Wed, 2017-09-13 at 19:18 +0100, Chris Wilson wrote: > > The goal here is to trim an excess posting read and keep the predicates > > Curious why we do the posting reads, is that a hardware requirement?
In most cases, no. In very few cases, we do need a delay in order to be sure the hw has processed the write before we continue (e.g. when enabling interrupts). But really it all started as a bad idea to try and move the regs over to WC with manual flushing, and cargo-culted since then. The challenge is that now those delays are in place, removing them requires care. -Chris _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx
