[Intel-gfx] [PATCH v3 0/5] drm/i915: Atomic sprites v3

[sourab gupta]

On Thu, Feb 13, 2014 at 9:12 PM, <ville.syrjala at linux.intel.com> wrote:

> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
>
> OK, so Daniel convinced me that the check+wait thing I used earlier
> wasn't really safe. I then decided that the only to make it safe it
> open coding the wait_for_event() mysefl, and after doing that I
> realized that we don't even need the silly vbl_received thingy, and
> just a wait queue + DSL check is enough. Let's see if Daniel can
> tear this one to shreds too :)
>
> Oh and I also did some more digging to the scanline counter + vblank
> interrupt mess, and decided that all my earlier hacks were crap. The
> solution was so simple once I started to look at the pixel counter
> values on gen4. I got inspired to have another look at this mess
> after Imre did some clock based vblank interrupt timing measurements
> on his VLV. Art confirmed my findings, so it should all be good now,
> no ugly hacks included.
>
> There is one tiny race window on gen2. That's caused by the fact that
> we only have the frame start interrupt there, and scanline counter
> increments slightly after the interrupt is triggered. So if we would
> extremely unlucky we might wake up, check the DSL, and determine we
> need to sleep more. But at this time we don't use the atomic update
> mechanism on gen2, and I think the windows is so small that we should
> be able to ignore it. Also the 1ms timeout would anyway prevent us from
> sleeping another full frame. So if it ever becomes a problem, we can
> try to think of something to overcome it, but at this point it doesn't
> seem worth the effort.
>
> Ville Syrjälä (5):
>   drm/i915: Fix scanout position for real
>   drm/i915: Add intel_get_crtc_scanline()
>   drm/i915: Make sprite updates atomic
>   drm/i915: Perform primary enable/disable atomically with sprite
>     updates
>   drm/i915: Add pipe update trace points
>
>  drivers/gpu/drm/i915/i915_irq.c      | 137 ++++++++++++------------
>  drivers/gpu/drm/i915/i915_trace.h    |  77 ++++++++++++++
>  drivers/gpu/drm/i915/intel_display.c |   2 +
>  drivers/gpu/drm/i915/intel_drv.h     |   3 +
>  drivers/gpu/drm/i915/intel_sprite.c  | 195
> ++++++++++++++++++++++++++++-------
>  5 files changed, 306 insertions(+), 108 deletions(-)
>
> Went through the patches and they seem fine.
Reviewed by: "Sourab Gupta <sourabgupta at gmail.com>"
for all 5 patches in the series.

> --
> 1.8.3.2
>
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