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SubjectRe: [Intel-gfx] [PATCH 2/2] drm/i915: Add async page flip support for SNB
On Thu, Jul 25, 2013 at 03:15:15PM -0700, Keith Packard wrote:
> Just copies the IVB code
>
> Signed-off-by: Keith Packard <keithp@keithp.com>
> ---
> drivers/gpu/drm/i915/intel_display.c | 17 +++++++++++++----
> 1 file changed, 13 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 166aa2c..4a118c3 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -7465,20 +7465,29 @@ static int intel_gen6_queue_flip(struct drm_device *dev,
> struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> struct intel_ring_buffer *ring = &dev_priv->ring[RCS];
> uint32_t pf, pipesrc;
> + uint32_t cmd;
> + uint32_t base;
> int ret;
>
> ret = intel_pin_and_fence_fb_obj(dev, obj, ring);
> if (ret)
> goto err;
>
> + cmd = MI_DISPLAY_FLIP | MI_DISPLAY_FLIP_PLANE(intel_crtc->plane);
> + base = i915_gem_obj_ggtt_offset(obj) + intel_crtc->dspaddr_offset;
> +
> + if (flags & DRM_MODE_PAGE_FLIP_ASYNC) {
> + cmd |= MI_DISPLAY_FLIP_ASYNC_INDICATOR;
> + base |= MI_DISPLAY_FLIP_TYPE_ASYNC;
> + }
> +
> ret = intel_ring_begin(ring, 4);
> if (ret)
> goto err_unpin;
>
> - intel_ring_emit(ring, MI_DISPLAY_FLIP |
> - MI_DISPLAY_FLIP_PLANE(intel_crtc->plane));
> + intel_ring_emit(ring, cmd);
> intel_ring_emit(ring, fb->pitches[0] | obj->tiling_mode);
> - intel_ring_emit(ring, i915_gem_obj_ggtt_offset(obj) + intel_crtc->dspaddr_offset);
> + intel_ring_emit(ring, base);
>
> /* Contrary to the suggestions in the documentation,
> * "Enable Panel Fitter" does not seem to be required when page

This PF flip stuff is a bit of a mystery. I'm not sure it exists on SNB
anymore. Some of the docs say that it's MBZ for SNB/IVB. Gen4/5 docs
say that DW3 must not be sent w/ async flips, and some SNB+ docs say
that it must not be sent with either sync or async flips.

Did you test this patch on actual hardware, and if so did it work as
expected? :)

I guess one would need to perform some empirical testing to figure out
what DW3 actually does.

> @@ -9731,7 +9740,7 @@ void intel_modeset_init(struct drm_device *dev)
> dev->mode_config.max_height = 8192;
> }
>
> - if (IS_GEN7(dev))
> + if (IS_GEN6(dev) || IS_GEN7(dev))
> dev->mode_config.async_page_flip = true;
>
> dev->mode_config.fb_base = dev_priv->gtt.mappable_base;
> --
> 1.8.3.2
>
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx

--
Ville Syrjälä
Intel OTC
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