From: Chris Wilson <chris@chris-wilson.co.uk>
To: Matt Roper <matthew.d.roper@intel.com>
Cc: intel-gfx@lists.freedesktop.org
Subject: Re: [RFC 0/4] Wire gen9 cursor interface to universal plane registers
Date: Thu, 27 Oct 2016 01:15:03 +0100 [thread overview]
Message-ID: <20161027001503.GA7102@nuc-i3427.alporthouse.com> (raw)
In-Reply-To: <1477522291-10874-1-git-send-email-matthew.d.roper@intel.com>
On Wed, Oct 26, 2016 at 03:51:27PM -0700, Matt Roper wrote:
> Gen9 has a traditional cursor plane that is mutually exclusive with the
> system's top-most "universal" plane; it seems likely that two planes are really
> a single shared hardware unit with two different register interfaces. Thus far
> i915 has exposed a cursor plane to userspace that's hooked up to the old-style
> cursor registers; we just pretended that the top-most universal plane didn't
> exist and reported one fewer "sprite/overlay" planes for each pipe than the
> platform technically has. Let's switch this around so that the cursor exposed
> to userspace is actually wired up to the previously-unused top-most universal
> plane registers. With this change we'll still present the same cursor ABI to
> userspace that we always have, but internally we'll just be programming a
> different set of registers and doing so in a way that's more consistent with
> how all the other gen9 planes work --- less cursor-specific special cases
> throughout the code.
But you still report it as PLANE_TYPE_CURSOR right? Otherwise those that
both expose all the overlay planes and use the legacy cursor abi will be
trying to use that plane simultaneously via two different paths (and
clients). Or is this another cap?
DRM_CLIENT_CAP_UNIVERSAL_PLANES = no-legacy-cursor-abi
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
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next prev parent reply other threads:[~2016-10-27 0:15 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-26 22:51 [RFC 0/4] Wire gen9 cursor interface to universal plane registers Matt Roper
2016-10-26 22:51 ` [RFC 1/4] drm/i915: Rename for_each_plane -> for_each_universal_plane Matt Roper
2016-10-28 18:15 ` Paulo Zanoni
2016-10-26 22:51 ` [RFC 2/4] drm/i915: Use macro in place of open-coded for_each_universal_plane loop Matt Roper
2016-10-28 18:17 ` Paulo Zanoni
2016-10-28 18:30 ` Matt Roper
2016-10-26 22:51 ` [RFC 3/4] drm/i915/gen9: Expose top-most universal plane as cursor Matt Roper
2016-10-27 20:03 ` Paulo Zanoni
2016-10-27 21:11 ` Matt Roper
2016-10-27 22:15 ` Lyude Paul
2016-10-27 22:35 ` Matt Roper
2016-10-27 22:55 ` Lyude Paul
2016-10-26 22:51 ` [RFC 4/4] drm/i915/gen9: Skip debugfs cursor output for universal plane platforms Matt Roper
2016-10-26 23:16 ` ✓ Fi.CI.BAT: success for Wire gen9 cursor interface to universal plane registers Patchwork
2016-10-27 0:15 ` Chris Wilson [this message]
2016-10-27 0:30 ` [RFC 0/4] " Matt Roper
2016-10-27 7:35 ` Daniel Vetter
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