When trying to obtain an accurate timestamp for the last vsync interrupt
in vblank_disable_and_save() we loop until the vsync counter after reading
the time stamp is identical to the one before.
In the case where no hardware timestamp can be obtained there is probably
no point in trying to make sure we remain within the same vsync during
the time we obtain the counter.
Furthermore we should make sure there's an 'emergency exit' so that we
don't end up in an endless loop when the driver get_vblank_timestamp()
function doesn't manage to return within the same vsync.
This may happen when this function prints out debugging information over
a slow (ie serial) line.
Signed-off-by: NEgbert Eich <eich@suse.de>
Signed-off-by: NDave Airlie <airlied@redhat.com>

... by properly checking connector->polled. This doesn't matter too
much because the polling work itself gets this slightly more right and
doesn't set repoll if there's nothing to do. But we can do better.

v2: Chris Wilson noticed that I broke polling, since repoll will never
ever be set true. Fix this up, and simplify the logic a bit while at
it.
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: NDave Airlie <airlied@redhat.com>

Signed-off-by: NIgor Murzov <e-mail@date.by>
Signed-off-by: NDave Airlie <airlied@redhat.com>

Fix a memory leak by deallocating the memory we got from
alloc_apertures().
Signed-off-by: NTommi Rantala <tt.rantala@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

Check for alloc_apertures() memory allocation failure, and propagate an
error code in case the allocation failed.
Signed-off-by: NTommi Rantala <tt.rantala@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

alloc_apertures() already does the assignment for us, so assigning the
count member after the alloc_apertures() call is not needed.
Signed-off-by: NTommi Rantala <tt.rantala@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

Fix a memory leak by deallocating the memory we got from
alloc_apertures().
Signed-off-by: NTommi Rantala <tt.rantala@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

Check for alloc_apertures() memory allocation failure, and propagate an
error code in case the allocation failed.
Signed-off-by: NTommi Rantala <tt.rantala@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

Check for alloc_apertures() memory allocation failure, and propagate an
error code in case the allocation failed.
Signed-off-by: NTommi Rantala <tt.rantala@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

It's unused.
Signed-off-by: NMarcin Slusarz <marcin.slusarz@gmail.com>
Reviewed-by: NThomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

It's unused.
Signed-off-by: NMarcin Slusarz <marcin.slusarz@gmail.com>
Reviewed-by: NThomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

All drivers set it to 0 and nothing uses it.
Signed-off-by: NMarcin Slusarz <marcin.slusarz@gmail.com>
Reviewed-by: NThomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

Use hweight32 instead of counting for each bit
Signed-off-by: NAkinobu Mita <akinobu.mita@gmail.com>
Cc: David Airlie <airlied@linux.ie>
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: NDave Airlie <airlied@redhat.com>

Use memchr_inv() to check the specified memory region is filled with zero.
Signed-off-by: NAkinobu Mita <akinobu.mita@gmail.com>
Cc: David Airlie <airlied@linux.ie>
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: NDave Airlie <airlied@redhat.com>

Jumps in the vblank and page flip event timestamps cause trouble for
clients, so we should avoid them. The timestamp we get currently with
gettimeofday can jump, so use instead monotonic timestamps.

For backward compatibility use a module flag to revert back to using
gettimeofday timestamps. Add also a DRM_CAP_TIMESTAMP_MONOTONIC flag
that is simply a read only version of the module flag, so that clients
can query this without depending on sysfs.
Signed-off-by: NImre Deak <imre.deak@intel.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

For measuring duration we want to avoid that our start/end timestamps
jump, so use monotonic instead of real time for that.
Signed-off-by: NImre Deak <imre.deak@intel.com>
Reviewed-by: mario.kleiner
Signed-off-by: NDave Airlie <airlied@redhat.com>

Otherwise if the detect callback reports a different state than what
the user forced (rather likely), we continously annoy userspace about
a hotplug uevent.
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

Actually there's a reason this stuff is there, and it's called

commit e58f637b
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date:   Fri Aug 20 09:13:36 2010 +0100

    drm/kms: Add a module parameter to disable polling

The idea has been that users can enable/disable polling at runtime. So
the quick hack has been to just re-enable the output polling if xrandr
asks for the latest state of the connectors.

The problem with that hack is that when we force connectors to another
state than what would be detected, we nicely ping-pong:
- Userspace calls probe, gets the forced state, but polling starts
  again.
- Polling notices that the state is actually different, wakes up
  userspace.
- Repeat.

As that commit already explains, the right fix would be to make the
locking more fine-grained, so that hotplug detection on one output
does not interfere with cursor updates on another crtc.

But that is way too much work. So let's just safe this gross hack by
caching the last-seen state of drm_kms_helper_poll for that driver,
and only fire up the poll engine again if it changed from off to on.

v2: Fixup the edge detection of drm_kms_helper_poll.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=49907Tested-by: NTvrtko Ursulin <tvrtko.ursulin@onelan.co.uk>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

This can help drivers to make somewhat intelligent decisions in their
->detect callback: If the connector is hpd capable and in the unknown
state, the driver needs to force a full detect cycle. Otherwise it
could just (if it chooses so) to update the connector state from it's
hpd handler directly, and always return that in the ->detect callback.

Atm only drm/i915 calls drm_mode_config_reset at resume time, so other
drivers would need to add that call first before using this facility.
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

All drivers already have a work item to run the hpd code, so we don't
need to launch a new one in the helper code. Dave Airlie mentioned
that the cancel+re-queue might paper over DP related hpd ping-pongs,
hence why this is split out.
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

Instead of reusing the polling code for hpd handling, split them up.
This has a few consequences:
- Don't touch HPD capable connectors in the poll loop.
- Only touch HPD capable connectors in drm_helper_hpd_irq_event.
- We could run the HPD handling directly (because all callers already
  use their own work item), but for easier bisect that happens in it's
  own patch.

The ultimate goal is that drivers grow some smarts about which
connectors have received a hotplug event and only call the detect code
of that connector. But that's a second step.

v2: s/hdp/hpd/, noticed by Adam Jackson. I can't type.

v3: Split out the work item removal as requested by Dave Airlie. This
results in a temporary mode_config.hpd_irq_work item to keep things
the same.

v4: In the hpd_irq_event handler don't bail out if other bits than HPD
are set. This is useful where e.g. hpd is unreliably, but mostly
works. Drivers can then set both HPD and POLL flags, and users get the
best of both worlds: Quick hotplug feedback if the hpd works, but
still reliable detection with the polling. The poll loop already works
the same, and doesn't bail if HPD is set.
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

Useful if drivers want to be slightly more clever about hotplug
handling.
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

A helper that drivers can use to send vblank event after a pageflip.
If the driver doesn't support proper vblank irq based time/seqn then
just pass -1 for the pipe # to get do_gettimestamp() behavior (since
there are a lot of drivers that don't use drm_vblank_count_and_time())

Also an internal send_vblank_event() helper for the various other code
paths within drm_irq that also need to send vblank events.

v1: original
v2: add back 'vblwait->reply.sequence = seq' which should not have
    been deleted
v3: add WARN_ON() in case lock is not held and comments
v4: use WARN_ON_SMP() instead to fix issue with !SMP && !DEBUG_SPINLOCK
    as pointed out by Marcin Slusarz
v5: update docbook
Signed-off-by: NRob Clark <rob@ti.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

This commit adds support for the HDMI output on the Tegra20 SoC. Only
one such output is available, but it can be driven by either of the two
display controllers.

A lot of work on this patch has been contributed by NVIDIA's Mark Zhang
<markz@nvidia.com> and many other people at NVIDIA were very helpful in
getting the HDMI support and surrounding infrastructure to work.
Signed-off-by: NThierry Reding <thierry.reding@avionic-design.de>
Tested-by: NStephen Warren <swarren@nvidia.com>
Acked-by: NMark Zhang <markz@nvidia.com>
Reviewed-by: NMark Zhang <markz@nvidia.com>
Tested-by: NMark Zhang <markz@nvidia.com>
Tested-and-acked-by: NAlexandre Courbot <acourbot@nvidia.com>
Acked-by: NTerje Bergstrom <tbergstrom@nvidia.com>
Tested-by: NTerje Bergstrom <tbergstrom@nvidia.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

This commit adds a KMS driver for the Tegra20 SoC. This includes basic
support for host1x and the two display controllers found on the Tegra20
SoC. Each display controller can drive a separate RGB/LVDS output.
Signed-off-by: NThierry Reding <thierry.reding@avionic-design.de>
Tested-by: NStephen Warren <swarren@nvidia.com>
Acked-by: NMark Zhang <markz@nvidia.com>
Reviewed-by: NMark Zhang <markz@nvidia.com>
Tested-by: NMark Zhang <markz@nvidia.com>
Tested-and-acked-by: NAlexandre Courbot <acourbot@nvidia.com>
Acked-by: NTerje Bergstrom <tbergstrom@nvidia.com>
Tested-by: NTerje Bergstrom <tbergstrom@nvidia.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

Fixes the following sparse warnings:
drivers/gpu/drm/udl/udl_connector.c:80:20: warning:
symbol 'udl_best_single_encoder' was not declared. Should it be static?
drivers/gpu/drm/udl/udl_connector.c:93:5: warning:
symbol 'udl_connector_set_property' was not declared. Should it be static?
drivers/gpu/drm/udl/udl_connector.c:106:35: warning:
symbol 'udl_connector_helper_funcs' was not declared. Should it be static?
drivers/gpu/drm/udl/udl_connector.c:112:28: warning:
symbol 'udl_connector_funcs' was not declared. Should it be static?
Signed-off-by: NSachin Kamat <sachin.kamat@linaro.org>
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

kfree on a null argument is a no-op.
Silences the following smatch warning:
drivers/gpu/drm/drm_stub.c:496 drm_put_dev() info:
redundant null check on dev->devname calling kfree()
Signed-off-by: NSachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: NDave Airlie <airlied@redhat.com>

kcalloc returns NULL on failure. Hence check for the return value
and exit on error to avoid NULL pointer dereference.

Fixes the following smatch errors:
drivers/gpu/drm/drm_fb_helper.c:1271 drm_setup_crtcs() error:
potential null dereference 'modes'.  (kcalloc returns null)
drivers/gpu/drm/drm_fb_helper.c:1272 drm_setup_crtcs() error:
potential null dereference 'crtcs'.  (kcalloc returns null)
Signed-off-by: NSachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: NDave Airlie <airlied@redhat.com>

drm_property_create_blob() could return NULL in which case NULL pointer
dereference error (on connector->edid_blob_ptr) is possible. Return if
connector->edid_blob_ptr is NULL.

Fixes the following smatch error:
drivers/gpu/drm/drm_crtc.c:3186 drm_mode_connector_update_edid_property()
error: potential null dereference 'connector->edid_blob_ptr'.
(drm_property_create_blob returns null)
Signed-off-by: NSachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: NDave Airlie <airlied@redhat.com>

kfree() on a NULL input is a no-op. Hence remove the check.
Signed-off-by: NSachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: NDave Airlie <airlied@redhat.com>

Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

x and y parameters are offsets, not width/height
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: NDave Airlie <airlied@redhat.com>

This patch adds support for getting CEA Video ID Code for a given
display mode after matching with edid_cea_modes list. Its index in
the list added with one, gives the desired code.

This exported function will be used by hdmi drivers for composing
AVI info frame data.
Signed-off-by: NStephane Marchesin <marcheu@chromium.org>
Signed-off-by: NRahul Sharma <rahul.sharma@samsung.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

Remove unnecessary braces to silence the following type of
checkpatch warnings:
WARNING: braces {} are not necessary for single statement blocks
WARNING: braces {} are not necessary for any arm of this statement
Signed-off-by: NSachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: NDave Airlie <airlied@redhat.com>

Converted printks to pr_* and dev_* to silence checkpatch warnings.
Signed-off-by: NSachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: NDave Airlie <airlied@redhat.com>

Fixes the following checkpatch errors:
ERROR: trailing statements should be on next line
98: FILE: gpu/drm/drm_fb_helper.c:98:
	case DRM_FORCE_OFF: s = "OFF"; break;
ERROR: trailing statements should be on next line
99: FILE: gpu/drm/drm_fb_helper.c:99:
	case DRM_FORCE_ON_DIGITAL: s = "ON - dig"; break;
ERROR: trailing statements should be on next line
101: FILE: gpu/drm/drm_fb_helper.c:101:
	case DRM_FORCE_ON: s = "ON"; break;
Signed-off-by: NSachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: NDave Airlie <airlied@redhat.com>

We link every DRM "file_priv" to a "drm_master" structure. Currently, the
drmSetMaster() call returns 0 when there is _any_ active master associated
with the "drm_master" structure of the calling "file_priv". This means,
that after drmSetMaster() we are not guaranteed to be DRM-Master and might
not be able to perform mode-setting.

A way to reproduce this is by starting weston with the DRM backend from
within an X-console (eg., xterm). Because the xserver's "drm_master" is
currently active, weston is assigned to the same master but is inactive
because its VT is inactive and the xserver is still active. But when
"fake-activating" weston, it calls drmSetMaster(). With current behavior
this returns "0/success" and weston thinks that it is DRM-Master, even
though it is not (as the xserver is still DRM-Master).
Expected behavior would be drmSetMaster() to return -EINVAL, because the
xserver is still DRM-Master. This patch changes exactly that.

The only way this bogus behavior would be useful is for clients to check
whether their associated "drm_master" is currently the active DRM-Master.
But this logic fails if no DRM-Master is currently active at all. Because
then the client itself would become DRM-Master (if it is root) and this
makes this whole thing useles.

Also note that the second "if-condition":
  file_priv->minor->master != file_priv->master
is always true and can be skipped.
Signed-off-by: NDavid Herrmann <dh.herrmann@googlemail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

Daniel writes:
Highlights of this -next round:
- ivb fdi B/C fixes
- hsw sprite/plane offset fixes from Damien
- unified dp/hdmi encoder for hsw, finally external dp support on hsw
  (Paulo)
- kill-agp and some other prep work in the gtt code from Ben
- some fb handling fixes from Ville
- massive pile of patches to align hsw VGA with the spec and make it
  actually work (Paulo)
- pile of workarounds from Jesse, mostly for vlv, but also some other
  related platforms
- start of a dev_priv reorg, that thing grew out of bounds and chaotic
- small bits&pieces all over the place, down to better error handling for
  load-detect on gen2 (Chris, Jani, Mika, Zhenyu, ...)

On top of the previous pile (just copypasta):
- tons of hsw dp prep patches form Paulo
- round scheduled work items and timers to nearest second (Chris)
- some hw workarounds (Jesse&Damien)
- vlv dp support and related fixups (Vijay et al.)
- basic haswell dp support, not yet wired up for external ports (Paulo)
- edp support (Paulo)
- tons of refactorings to prepare for the above (Paulo)
- panel rework, unifiying code between lvds and edp panels (Jani)
- panel fitter scaling modes (Jani + Yuly Novikov)
- panel power improvements, should now work without the BIOS setting it up
- extracting some dp helpers from radeon/i915 and move them to
  drm_dp_helper.c
- randome pile of workarounds (Damien, Ben, ...)
- some cleanups for the register restore code for suspend/resume
- secure batchbuffer support, should enable tear-free blits on gen6+
  Chris)
- random smaller fixlets and cleanups.

* 'for-airlied' of git://people.freedesktop.org/~danvet/drm-intel: (231 commits)
  drm/i915: Restore physical HWS_PGA after resume
  drm/i915: Report amount of usable graphics memory in MiB
  drm/i915/i2c: Track users of GMBUS force-bit
  drm/i915: Allocate the proper size for contexts.
  drm/i915: Update load-detect failure paths for modeset-rework
  drm/i915: Clear unused fields of mode for framebuffer creation
  drm/i915: Always calculate 8xx WM values based on a 32-bpp framebuffer
  drm/i915: Fix sparse warnings in from AGP kill code
  drm/i915: Missed lock change with rps lock
  drm/i915: Move the remaining gtt code
  drm/i915: flush system agent TLBs on SNB
  drm/i915: Kill off now unused gen6+ AGP code
  drm/i915: Calculate correct stolen size for GEN7+
  drm/i915: Stop using AGP layer for GEN6+
  drm/i915: drop the double-OP_STOREDW usage in blt_ring_flush
  drm/i915: don't rewrite the GTT on resume v4
  drm/i915: protect RPS/RC6 related accesses (including PCU) with a new mutex
  drm/i915: put ring frequency and turbo setup into a work queue v5
  drm/i915: don't block resume on fb console resume v2
  drm/i915: extract l3_parity substruct from dev_priv
  ...

By always setting up the HWS register for both physical and virtual
address variations during render ring we can reduce the number of
different special cases that get set up at varying different times
during module load.

Fixes regression from

commit c630119f
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Wed Oct 17 11:32:57 2012 +0200

    drm/i915: don't save/restore HWS_PGA reg for kms
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

...rather than kilo-PTE.
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
[danvet: Apply s/Usabel/usable/ bikeshed suggested by Ben Widawsky.]
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>