3.2-stable review patch. If anyone has any objections, please let me know.
------------------ From: Chris Wilson <ch...@chris-wilson.co.uk> commit f05bb0c7b624252a5e768287e340e8e45df96e42 upstream. On SNB, if bit 13 of GFX_MODE, Flush TLB Invalidate Mode, is not set to 1, the hardware can not program the scanline values. Those scanline values then control when the signal is sent from the display engine to the render ring for MI_WAIT_FOR_EVENTs. Note setting this bit means that TLB invalidations must be performed explicitly through the appropriate bits being set in PIPE_CONTROL. References: https://bugzilla.kernel.org/show_bug.cgi?id=52311 Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk> Reviewed-by: Ben Widawsky <b...@bwidawsk.net> Signed-off-by: Daniel Vetter <daniel.vet...@ffwll.ch> [bwh: Backported to 3.2: s/_MASKED_BIT/GFX_MODE/] Signed-off-by: Ben Hutchings <b...@decadent.org.uk> --- drivers/gpu/drm/i915/intel_ringbuffer.c | 5 +++++ 1 file changed, 5 insertions(+) --- a/drivers/gpu/drm/i915/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c @@ -407,6 +407,11 @@ static int init_render_ring(struct intel if (INTEL_INFO(dev)->gen >= 6) I915_WRITE(MI_MODE, GFX_MODE_ENABLE(ASYNC_FLIP_PERF_DISABLE)); + /* Required for the hardware to program scanline values for waiting */ + if (INTEL_INFO(dev)->gen == 6) + I915_WRITE(GFX_MODE, + GFX_MODE_ENABLE(GFX_TLB_INVALIDATE_ALWAYS)); + if (IS_GEN7(dev)) I915_WRITE(GFX_MODE_GEN7, GFX_MODE_DISABLE(GFX_TLB_INVALIDATE_ALWAYS) | -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
