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drm_i915_private is getting bigger and bigger when adding new vbt stuff.
So, the better way of getting drm_i915_private organized is to create
a special structure for vbt stuff.
v2: Basically conflicts fixes
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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We need to track this correctly. While at it shovel the boolean
to track whether the sdvo is in tv mode or not into pipe_config.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=36997
Tested-by: Pierre Assal <pierre.assal@verint.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=63609
Tested-by: cancan,feng <cancan.feng@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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More ugly stuff gone for good! The big special case left now is
lvds (which is indeed really special).
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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This seems to be an impressive piece of copy&pasta lore. I've
checked all docs and on most platforms these bits are all MBZ, with
the exception of the SDVO pixel multiplier on gen3. On gen4 that
moved to a special DPLL_MD registers.
No indication whatsoever that we actually need this for native
TV-out support. I suspect this started as a hack when we didn't
yet have proper pixel multiplier support in place for SDVO TV, but
then got stuck in a life of its own.
Just rip it out.
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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TV-out uses the same reference clock as everyone else. The only
difference seems to be in the slightly different CB tuning limit.
Note that PLL_REF_INPUT_TVCLKINBC is a reserved value on ilk+. Also
strictly speaking we don't support native TV-out on ilk+, hence all
that code is dead. But Bspec still contains some residual mentions of
native TV-out on some pch-split platforms, so I've figured it doesn't
hurt to keep the code around a bit longer (e.g. in the cb tune
function).
v2: Improve the commit message as Jani suggested in his review.
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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We have a very nice infrastructure for this now!
Note that the multifunction sdvo support is pretty neatly broken: We
completely ignore userspace's request for which connector to wire up
with the encoder and just use whatever the last detect callback has
seen.
Not something I'll fix in this patch, but unfortunately something
which is also broken in the DDI code ...
v2: Don't call sdvo_tv_clock twice.
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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Signed-off-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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There are no more users for these, so remove them.
Signed-off-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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is_pch_edp() will be removed by the next patch, so replace it by a check
for the port and device type.
Signed-off-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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is_pch_edp() will be removed in a follow-up patch, so replace it
with a check for the port and VBT info (for port-D eDP).
Also make things a bit clearer by using a switch on the ports.
v2:
- make the comment about not setting the conder type for DP clearer
(Ville)
Signed-off-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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On ILK-IVB the CPU side eDP is always on port-A.
Also reduce somewhat the debug verbosity.
v2:
- reduce debug verbosity
Signed-off-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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On HSW the CPU side eDP is always on port-A, the PCH side eDP is always
on port-D.
Signed-off-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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Signed-off-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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Works pretty well actually.
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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In some cases, we may not need GTT address space allocated to a stolen
object, so allow passing -1 to the preallocated function to indicate as
much.
v2: remove BUG_ON(gtt_offset & 4095) now that -1 is allowed (Ville)
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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But we need to get the right stolen base and make pre-allocated objects
for BIOS stuff so we don't clobber it. If the BIOS hasn't allocated a
power context, we allocate one here too, from stolen space as required
by the docs.
v2: fix stolen to phys if ladder (Ben)
keep BIOS reserved space out of allocator altogether (Ben)
v3: fix mask of stolen base (Ben)
v4: clean up preallocated object on unload (Ben)
don't zero reg on unload (Jesse)
fix mask harder (Jesse)
v5: use unref for freeing stolen bits (Chris)
move alloc/free to intel_pm.c (Chris)
v6: NULL pctx at disable time so error paths work (Ben)
v7: use correct PCI device for config read (Jesse)
Reviewed-by: Ben Widawsky <benjamin.widawsky@intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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If the calculated FBC watermark is no good, we simply disable FBC
watermarks. But we fail to re-enable them later if the calculated
watermark becomes good again. Fix that, but remember to leave FBC
watermarks disabled on ILK since that's required by some workarounds.
v2: Fix checkpatch complaint
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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For the device to enter D3 we should enable PCH clock gating.
v2:
- use HAS_PCH_LPT instead of IS_HASWELL (Ville, Paolo)
- rename lpt_allow_clock_gating to lpt_suspend_hw (Paolo)
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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commit 142e239849c800f9dc23f828762873073f612d3f
Author: Egbert Eich <eich@suse.de>
Date: Thu Apr 11 15:57:57 2013 +0200
drm/i915: Add bit field to record which pins have received HPD events (v3)
added a bit field for hotplug event tracking. There ended up being three
different v3 of the patch: [1], [2], and [3]. Apparently [1] was the
correct one, but some frankenstein combination of the three got
committed, which reversed the logic for setting the hotplug bits and
misplaced a continue statement, skipping the hotplug irq storm handling
altogether.
This lead to broken hotplug detection, bisected to
commit 321a1b3026ea194dd084cf3bda1e235b2986b0af
Author: Egbert Eich <eich@suse.de>
Date: Thu Apr 11 16:00:26 2013 +0200
drm/i915: Only reprobe display on encoder which has received an HPD event (v2)
which uses the incorrectly set hotplug event bits.
Fix the mess.
[1] http://mid.gmane.org/1366112220-7638-6-git-send-email-eich@suse.de
[2] http://mid.gmane.org/1365688677-13682-1-git-send-email-eich@suse.de
[3] http://mid.gmane.org/1365688996-13874-1-git-send-email-eich@suse.de
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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We did not mention the workaround name when implementing those. This
should help us track what we already implement.
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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We already have the same check on intel_enable_ddi. This patch
prevents "unclaimed register" messages when the power well is
disabled.
V2: Reset intel_crtc->eld_vld to false after the mode_set function.
V3: Add both "type != INTEL_OUTPUT_EDP" requested.
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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This fixes "unclaimed register" messages when the power well is
disabled and there's a GPU hang.
v2: Use the new intel_display_power_enabled().
v3: Use the new domains for intel_display_power_enabled().
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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In the error state function we read the registers without checking if
the power well is on, so after doing this we have to clear the
FPGA_DBG_RM_NOCLAIM bit to prevent the next I915_WRITE from detecting
it and printing an error message.
The first version of this patch was checking for the power well state
and then avoiding reading registers that were off, but the reviewers
requested to just read the registers any way and then later clear the
FPGA_DBG_RM_NOCLAIM bit.
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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We need to dump these registers if we want to properly interpret the
others.
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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This should replace intel_using_power_well. The idea is that we're
adding the requested power domain as an argument, so this might enable
the code to look less platform-specific and also allows us to easily
add new domains in case we need.
v2: Add more domains to enum intel_display_power_domain
v3: Even more domains requested
Requested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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Supposedly we should use the DAC divider for <300MHz pixel clocks, but as
that doesn't actually work as well as the high freq divider here in
practice, just use the high freq divider all the time.
v2: remove unconditional write (Jesse)
check for pixel rate properly (Jesse)
v3: give up, the DAC divider apparently doesn't work, and low res modes
work ok (Jesse)
remove debug msg (Jesse)
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Tested-by: Kenneth Graunke <kenneth@whitecape.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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This regression was introduced in:
commit b074cec8c652f2d273907a4b35239b4766c894ac
Author: Jesse Barnes <jbarnes@virtuousgeek.org>
Date: Thu Apr 25 12:55:02 2013 -0700
drm/i915: move PCH pfit controls into pipe_config
In refactoring this, it was only applied to eDP, which is incorrect. In
fact, if we ever use the panel fitter to deal with overscan on HDMI,
we'll need to extend it again, so just drop the conditional altogether.
v2: drop check for eDP since we can use the fitter in any config (Daniel)
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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Both the docs and the existing code were wrong. So fix both and use a
switch statement like we do elsewhere to make things simple & clear.
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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Instead of returning the cached value, which is just what the kernel
requested.
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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Description:
intel_gmbus_is_forced_bit is no extern as its body is right below.
Likewise for intel_gmbus_is_port_valid.
This fixes a compilation issue with clang. An initial version of this patch
was developed by PaX Team <pageexec at freemail.hu>.
This is respin of this patch.
20130509: v2: (re-)add inline upon request.
Signed-off-by: Jan-Simon Möller <dl9pf@gmx.de>
CC: pageexec@freemail.hu
CC: daniel.vetter@ffwll.ch
CC: airlied@linux.ie
CC: intel-gfx@lists.freedesktop.org
CC: dri-devel@lists.freedesktop.org
CC: linux-kernel@vger.kernel.org
[danvet: Bikeshed commit message.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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It also makes some sense IMO to have these two functions separate
irrespective of the number of callers.
Only the single caller for now, but that will change as we add more
PPGTTs.
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
[danvet: Resolve conflict.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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Because PPGTT PDEs within the GTT are calculated in cachelines
(HW guys consistency ftw) we do a divide which will wreak havoc if this
is wrong, and I know that from experience).
If/when we move to multiple PPGTTs this will have to become a WARN, and
return an error. For now however it should always be considered fatal,
and only a developer could hit it.
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
[danvet: s/BUG/WARN]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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Because our context refcounting doesn't grab a ref at lookup time, it is
unsafe to do so without the lock.
NOTE: We don't have an easy way to put the assertion in the lookup
function which is where this really belongs. Context switching is good
enough because it actually asserts even more correctness by protecting
the default_context.
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
[danvet: s/BUG/WARN/]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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Only one caller. Also drop the intel_ prefix as is now customary for
platform specific and static functions.
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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- PCH_ prefix for pch registers on ibx/cpt/ppt.
- Drop the DP_ from the link defines, redundant.
- Drop the GMCH from the data defines and instead give the special g4x
registers a consistent _G4X postfix.
v2:
- Realign #defines and use tabs (Paulo).
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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This is possible thanks to moving the m/n stuff into pipe_config.
Unfortunately we need to move them a bit to avoid forward
declarations.
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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While at it, also extract a common helper to copy the timings from the
cpu transcoder to the pch transcoder. That way it's really explicit
how the lpt transcoder is hardcoded.
v2:
- Re-align #defines properly (Paulo).
- Use cpu_transcoder when copying pipe timings (Paulo).
- s/intel_pch_transcoder_enable/intel_pch_transcoder_set_timings/
since we already have a pch transcoder enable function, and this is
clearer, too.
- Fixup 80 char line overflow in intel_display.c. I've opted to ignore
this in i915_reg.h and i915_ums.c since meh.
Cc: Paulo Zanoni <przanoni@gmail.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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Every time I read hsw code I get completely confused about this. So
call it what it is more explicitly.
Also, add an LPT_TRANSCONF for the pch transcoder A and use it in
lpt-only code, to really unconfuse me.
v2: s/plane/pipe/ in the TRANSCONF #define (Paulo).
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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With the hw state readout&check code it's important that the values we
keep around are the canonical ones. Unfortunately when adding the pipe
timings readout support I've missed that the write side adjusts the
timings in the pipe config.
Fix this up and so prevent the unsightly WARN noise in dmesg. This
regression has been introduced in
commit 1bd1bd806037af04dd1d7bdd39b2b04090c10d2c
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Mon Apr 29 21:56:12 2013 +0200
drm/i915: hw state readout support for pipe timings
Reported-by: Paulo Zanoni <przanoni@gmail.com>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Tested-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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Storing context reference into request struct
allows us to inspect context and its associated
objects when requests are retired.
Both ppgtt and arb robustness work will need
this.
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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In order to be notified of when the context and all of its associated
objects is idle (for if the context maps to a ppgtt) we need a callback
from the retire handler. We can arrange this by using the kref_get/put
of the context for request tracking and by inserting a request to
demarque the switch away from the old context.
[Ben: fixed minor error to patch compile, AND s/last_context/from/]
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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dp_init_connector adjusts the encoder type if it is a eDP panel. Use
that to decide whether we should set up a hdmi connector or not.
To do so reorder the hdmi connector setup sequence in ddi_init a bit.
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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We can't read the pfit regs if the power well is off, so use the cached
value.
v2: re-add lost comment (Jesse)
make sure the crtc using the fitter is actually enabled (Jesse)
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
[danvet: Drop now unused dev_priv, as spotted by Mika.]
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Tested-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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Before module unload is called, gpu_idle() will switch
to default context. This will increment ref count of base
object as the default context is 'running' on module unload
time. Unreference the drm object so that when context
is freed, base object is freed as well.
v2: added comment to explain the refcounts (Ben Widawsky)
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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If we ever leak a non-DP compliant port width through here, we have a
pretty serious issue. So just rip out all these WARNs - if we need
them it's probably better to have them at a central place where we
compute the dp lane count.
Also use the new DDI width macro for FDI mode.
Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
[danvet: fixup the embarrassing s/intel_dp->DP/temp/ mistake Paulo
spotted.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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Enabling PPGTT and also the need to track which context was guilty of
gpu hang (arb robustness enabling) have put pressure for struct i915_hw_context
to be more than just a placeholder for hw context state.
In order to track object lifetime properly in a multi peer usage, add reference
counting for i915_hw_context.
v2: track i915_hw_context pointers instead of using ctx_ids
(from Chris Wilson)
v3 (Ben): Get rid of do_release() and handle refcounting more compactly.
(recommended by Chis)
v4: kref_* put inside static inlines (Daniel Vetter)
remove code duplication on freeing context (Chris Wilson)
v5: idr_remove and ctx->file_priv = NULL in destroy ioctl (Chris)
This actually will cause a problem if one destroys a context and later
refers to the idea of the context (multiple contexts may have the same
id, but only 1 will exist in the idr).
v6: Strip out the request related stuff. Reworded commit message.
Got rid of do_destroy and introduced i915_gem_context_release_handle,
suggested by Chris Wilson.
v7: idr_remove can't be called inside idr_for_each (Chris Wilson)
Signed-off-by: Ben Widawsky <ben@bwidawsk.net> (v5)
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com> (v7)
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
[danvet: Squash sob lines, the patch ping-ponged between Ben and Mika
a bit ...]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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Reduce the size of the the src/dst viewport to keep the scalign ratios
in check.
v2: Below min size sprite handling squashed to previous patch
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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Properly clip the source when the destination gets clipped
by the pipe dimensions.
Sadly the video sprite hardware is rather limited so it can't do proper
sub-pixel postitioning. Resort to truncating the source coordinates to
(macro)pixel boundary.
The scaling checks are done using the strict drm_region functions.
Which means that an error is returned when the min/max scaling
ratios are exceeded.
Also do some additional checking against various hardware limits.
v2: Truncate src coords instead of rounding to avoid increasing src
viewport size, and adapt to changes in drm_calc_{h,v}scale().
v3: Adapt to drm_region->drm_rect rename. Fix misaligned crtc_w for
packed YUV formats when scaling isn't supported.
v4: Use stricter scaling checks, use drm_rect_equals()
v5: If sprite is below min size, make it invisible instead returning
an error.
Use WARN_ON() instead if BUG_ON(), and add one to sanity check the
src viewport size.
v6: Add comments to remind about src and dst coordinate types
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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drm_rect_equals() tells whether two drm_rects are equal.
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Acked-by: Dave Airlie <airlied@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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