This patch adds new fields that are not yet added in drm code
in child devices struct
Signed-off-by: NSivakumar Thulasimani <sivakumar.thulasimani@intel.com>
Signed-off-by: NDurgadoss R <durgadoss.r@intel.com>
Signed-off-by: NShubhangi Shrivastava <shubhangi.shrivastava@intel.com>
Reviewed-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: NJani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1459420907-11383-1-git-send-email-shubhangi.shrivastava@intel.com

Currently we set the initial GPU frequency to min_freq_softlimit
on gen9, and to efficient_freq on VLV/CHV. On all the other platforms
we set it to idle_freq. Let's use idle_freq across the board to make
sure we don't waste power. This is especially relevant for VLV since
Vnn won't drop to minimum unless the GPU is at the minimum frequency.
Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1457120584-26080-3-git-send-email-ville.syrjala@linux.intel.comReviewed-by: NImre Deak <imre.deak@intel.com>

Extract the GPLL reference frequency from CCK and use it in the
GPU freq<->opcode conversions on VLV/CHV. This eliminates all the
assumptions we have about which divider is used for which czclk
frequency.

Note that unlike most clocks from CCK, the GPLL ref clock is a divided
down version of the CZ clock rather than the HPLL clock. CZ clock itself
is a divided down version of the HPLL clock though, so in effect it just
gets divided down twice.

While at it, throw in a few comments explaining the remaining constants
for anyone who later wants to compare this to the spreadsheets.

v2: Add slow/fast notes for CHV clocks (Imre)
Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1457120584-26080-2-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Imre Deak <imre.deak@intel.com> (v1)

After a suspend-resume cycle, the resumed kernel has no idea what the
booted kernel may have done to the GuC before replacing itself with the
resumed image. In particular, it may have already loaded the GuC with
firmware, which will then cause this kernel's attempt to (re)load the
firmware to fail (GuC program memory is write-once!). The symptoms
(GuC firmware reload fails after hibernation) are further described
in the Bugzilla reference below.

So let's *always* reset the GuC just before (re)loading the firmware;
the hardware should then be in a well-known state, and we may even
avoid some of the issues arising from unpredictable timing.

Also added some more fields & values to the definition of the GUC_STATUS
register, which is the key diagnostic indicator if the GuC load fails.
Signed-off-by: NDave Gordon <david.s.gordon@intel.com>
Reviewed-by: NArun Siluvery <arun.siluvery@linux.intel.com>
Cc: Alex Dai <yu.dai@intel.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=94390Signed-off-by: NTvrtko Ursulin <tvrtko.ursulin@intel.com>

Due to timing issues in the HW, some of the status bits required for GuC
authentication occasionally don't get set; when that happens, the GuC
cannot be initialized and we will be left with a wedged GPU. The W/A
suggested is to perform a soft reset of the GuC and attempt to reload
the F/W again for few times before giving up.

As the failure is dependent on timing, tests performed by triggering
manual full gpu reset (i915_wedged) showed that we could sometimes hit
this after several thousand iterations, but sometimes tests ran even
longer without any issues. Reset and reload mechanism proved helpful
when we indeed hit f/w load failure, so it is better to include this
to improve driver stability.

This change implements the following WAs,

	WaEnableuKernelHeaderValidFix:skl,bxt
	WaEnableGuCBootHashCheckNotSet:skl,bxt
Signed-off-by: NArun Siluvery <arun.siluvery@linux.intel.com>
Signed-off-by: NDave Gordon <david.s.gordon@intel.com>
Reviewed-by: NAlex Dai <yu.dai@intel.com>
Signed-off-by: NTvrtko Ursulin <tvrtko.ursulin@intel.com>

Both the oom and vmap notifier callbacks have a loop to acquire the
struct_mutex and set the device as uninterruptible, within a certain
time. Refactor the common code into a pair of functions.
Suggested-by: NJoonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1459848145-24042-1-git-send-email-chris@chris-wilson.co.ukReviewed-by: NJoonas Lahtinen <joonas.lahtinen@linux.intel.com>

If the core runs out of vmap address space, it will call a notifier in
case any driver can reap some of its vmaps. As i915.ko is possibily
holding onto vmap address space that could be recovered, hook into the
notifier chain and try and reap objects holding onto vmaps.
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Roman Pen <r.peniaev@gmail.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Mika Kahola <mika.kahola@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1459777603-23618-4-git-send-email-chris@chris-wilson.co.ukReviewed-by: NJoonas Lahtinen <joonas.lahtinen@linux.intel.com>

vmaps are temporary kernel mappings that may be of long duration.
Reusing a vmap on an object is preferrable for a driver as the cost of
setting up the vmap can otherwise dominate the operation on the object.
However, the vmap address space is rather limited on 32bit systems and
so we add a notification for vmap pressure in order for the driver to
release any cached vmappings.

The interface is styled after the oom-notifier where the callees are
passed a pointer to an unsigned long counter for them to indicate if they
have freed any space.

v2: Guard the blocking notifier call with gfpflags_allow_blocking()
v3: Correct typo in forward declaration and move to head of file
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Roman Peniaev <r.peniaev@gmail.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org
Acked-by: Andrew Morton <akpm@linux-foundation.org> # for inclusion via DRM
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1459777603-23618-3-git-send-email-chris@chris-wilson.co.ukReviewed-by: NJoonas Lahtinen <joonas.lahtinen@linux.intel.com>

Since we only attempt to purge an object if can_release_pages() report
true, we should also only add it to the count of potential recoverable
pages when can_release_pages() is true.
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Akash Goel <akash.goel@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1459777603-23618-2-git-send-email-chris@chris-wilson.co.ukReviewed-by: NJoonas Lahtinen <joonas.lahtinen@linux.intel.com>

Reviewed-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: NJani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/65d58c578adecc205a741102329bc9c9f6eb79cf.1458299160.git.jani.nikula@intel.com

In sequence block v2, and only in v2, the gpio source (i.e. IOSF port)
is specified separately.

v2: initialize gpio_source to 0 and handle v1 and v2 in the same branch
Reviewed-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: NJani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/87152feec8f921dc82502af1b29c0956b0d360bb.1458299160.git.jani.nikula@intel.com

Doing a lot of work in the interrupt handler introduces huge
latencies to the system as a whole.

Most dramatic effect can be seen by running an all engine
stress test like igt/gem_exec_nop/all where, when the kernel
config is lean enough, the whole system can be brought into
multi-second periods of complete non-interactivty. That can
look for example like this:

 NMI watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [kworker/u8:3:143]
 Modules linked in: [redacted for brevity]
 CPU: 0 PID: 143 Comm: kworker/u8:3 Tainted: G     U       L  4.5.0-160321+ #183
 Hardware name: Intel Corporation Broadwell Client platform/WhiteTip Mountain 1
 Workqueue: i915 gen6_pm_rps_work [i915]
 task: ffff8800aae88000 ti: ffff8800aae90000 task.ti: ffff8800aae90000
 RIP: 0010:[<ffffffff8104a3c2>]  [<ffffffff8104a3c2>] __do_softirq+0x72/0x1d0
 RSP: 0000:ffff88014f403f38  EFLAGS: 00000206
 RAX: ffff8800aae94000 RBX: 0000000000000000 RCX: 00000000000006e0
 RDX: 0000000000000020 RSI: 0000000004208060 RDI: 0000000000215d80
 RBP: ffff88014f403f80 R08: 0000000b1b42c180 R09: 0000000000000022
 R10: 0000000000000004 R11: 00000000ffffffff R12: 000000000000a030
 R13: 0000000000000082 R14: ffff8800aa4d0080 R15: 0000000000000082
 FS:  0000000000000000(0000) GS:ffff88014f400000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 CR2: 00007fa53b90c000 CR3: 0000000001a0a000 CR4: 00000000001406f0
 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
 Stack:
  042080601b33869f ffff8800aae94000 00000000fffc2678 ffff88010000000a
  0000000000000000 000000000000a030 0000000000005302 ffff8800aa4d0080
  0000000000000206 ffff88014f403f90 ffffffff8104a716 ffff88014f403fa8
 Call Trace:
  <IRQ>
  [<ffffffff8104a716>] irq_exit+0x86/0x90
  [<ffffffff81031e7d>] smp_apic_timer_interrupt+0x3d/0x50
  [<ffffffff814f3eac>] apic_timer_interrupt+0x7c/0x90
  <EOI>
  [<ffffffffa01c5b40>] ? gen8_write64+0x1a0/0x1a0 [i915]
  [<ffffffff814f2b39>] ? _raw_spin_unlock_irqrestore+0x9/0x20
  [<ffffffffa01c5c44>] gen8_write32+0x104/0x1a0 [i915]
  [<ffffffff8132c6a2>] ? n_tty_receive_buf_common+0x372/0xae0
  [<ffffffffa017cc9e>] gen6_set_rps_thresholds+0x1be/0x330 [i915]
  [<ffffffffa017eaf0>] gen6_set_rps+0x70/0x200 [i915]
  [<ffffffffa0185375>] intel_set_rps+0x25/0x30 [i915]
  [<ffffffffa01768fd>] gen6_pm_rps_work+0x10d/0x2e0 [i915]
  [<ffffffff81063852>] ? finish_task_switch+0x72/0x1c0
  [<ffffffff8105ab29>] process_one_work+0x139/0x350
  [<ffffffff8105b186>] worker_thread+0x126/0x490
  [<ffffffff8105b060>] ? rescuer_thread+0x320/0x320
  [<ffffffff8105fa64>] kthread+0xc4/0xe0
  [<ffffffff8105f9a0>] ? kthread_create_on_node+0x170/0x170
  [<ffffffff814f351f>] ret_from_fork+0x3f/0x70
  [<ffffffff8105f9a0>] ? kthread_create_on_node+0x170/0x170

I could not explain, or find a code path, which would explain
a +20 second lockup, but from some instrumentation it was
apparent the interrupts off proportion of time was between
10-25% under heavy load which is quite bad.

When a interrupt "cliff" is reached, which was >~320k irq/s on
my machine, the whole system goes into a terrible state of the
above described multi-second lockups.

By moving the GT interrupt handling to a tasklet in a most
simple way, the problem above disappears completely.

Testing the effect on sytem-wide latencies using
igt/gem_syslatency shows the following before this patch:

gem_syslatency: cycles=1532739, latency mean=416531.829us max=2499237us
gem_syslatency: cycles=1839434, latency mean=1458099.157us max=4998944us
gem_syslatency: cycles=1432570, latency mean=2688.451us max=1201185us
gem_syslatency: cycles=1533543, latency mean=416520.499us max=2498886us

This shows that the unrelated process is experiencing huge
delays in its wake-up latency. After the patch the results
look like this:

gem_syslatency: cycles=808907, latency mean=53.133us max=1640us
gem_syslatency: cycles=862154, latency mean=62.778us max=2117us
gem_syslatency: cycles=856039, latency mean=58.079us max=2123us
gem_syslatency: cycles=841683, latency mean=56.914us max=1667us

Showing a huge improvement in the unrelated process wake-up
latency. It also shows an approximate halving in the number
of total empty batches submitted during the test. This may
not be worrying since the test puts the driver under
a very unrealistic load with ncpu threads doing empty batch
submission to all GPU engines each.

Another benefit compared to the hard-irq handling is that now
work on all engines can be dispatched in parallel since we can
have up to number of CPUs active tasklets. (While previously
a single hard-irq would serially dispatch on one engine after
another.)

More interesting scenario with regards to throughput is
"gem_latency -n 100" which  shows 25% better throughput and
CPU usage, and 14% better dispatch latencies.

I did not find any gains or regressions with Synmark2 or
GLbench under light testing. More benchmarking is certainly
required.

v2:
   * execlists_lock should be taken as spin_lock_bh when
     queuing work from userspace now. (Chris Wilson)
   * uncore.lock must be taken with spin_lock_irq when
     submitting requests since that now runs from either
     softirq or process context.

v3:
   * Expanded commit message with more testing data;
   * converted missed locking sites to _bh;
   * added execlist_lock comment. (Chris Wilson)

v4:
   * Mention dispatch parallelism in commit. (Chris Wilson)
   * Do not hold uncore.lock over MMIO reads since the block
     is already serialised per-engine via the tasklet itself.
     (Chris Wilson)
   * intel_lrc_irq_handler should be static. (Chris Wilson)
   * Cancel/sync the tasklet on GPU reset. (Chris Wilson)
   * Document and WARN that tasklet cannot be active/pending
     on engine cleanup. (Chris Wilson/Imre Deak)
Signed-off-by: NTvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Imre Deak <imre.deak@intel.com>
Testcase: igt/gem_exec_nop/all
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=94350Reviewed-by: NChris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/1459768316-6670-1-git-send-email-tvrtko.ursulin@linux.intel.com

Silences

	src/drivers/gpu/drm/i915/intel_ddi.c: warning: 'port' may be used uninitialized in this function [-Wuninitialized]
Reported-by: NGeert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/1459717154-27607-1-git-send-email-chris@chris-wilson.co.uk

As the current PCI power state is an essential feature of runtime pm,
include it in the debugfs/i915_runtime_pm_status.

v2: Use pci_power_name()
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Cc: Imre Deak <imre.deak@intel.com>
Reviewed-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1459689261-7920-2-git-send-email-chris@chris-wilson.co.uk

Since describe_obj() looks at state guarded by the struct_mutex, we need
to be holding it.

[  580.201054] drv_suspend: starting subtest debugfs-reader
[  580.239652] ------------[ cut here ]------------
[  580.239696] WARNING: CPU: 0 PID: 920 at include/linux/list_check.h:25 describe_obj+0x419/0x440()
[  580.239725] CPU: 0 PID: 920 Comm: cat Not tainted 4.5.0-rc6+ #835
[  580.239745] Hardware name:                  /NUC5CPYB, BIOS PYBSWCEL.86A.0027.2015.0507.1758 05/07/2015
[  580.239767]  0000000000000000 ffff88027554fcf8 ffffffff812c1135 0000000000000000
[  580.239815]  ffffffff8193dc42 ffff88027554fd30 ffffffff8107419d ffff880071727c00
[  580.239858]  ffff8802757d8000 ffffffff818f693c ffffffff818f693c ffff8802757b9048
[  580.239896] Call Trace:
[  580.239917]  [<ffffffff812c1135>] dump_stack+0x67/0x92
[  580.239939]  [<ffffffff8107419d>] warn_slowpath_common+0x7d/0xb0
[  580.239959]  [<ffffffff810742ba>] warn_slowpath_null+0x1a/0x20
[  580.239981]  [<ffffffff813ce579>] describe_obj+0x419/0x440
[  580.240006]  [<ffffffff813ced22>] i915_gem_framebuffer_info+0xa2/0x100
[  580.240033]  [<ffffffff811a9286>] seq_read+0xe6/0x3b0
[  580.240059]  [<ffffffff81182288>] __vfs_read+0x28/0xd0
[  580.240085]  [<ffffffff81173378>] ? SyS_fadvise64+0x228/0x2c0
[  580.240112]  [<ffffffff811823b2>] vfs_read+0x82/0x110
[  580.240137]  [<ffffffff811827d9>] SyS_read+0x49/0xa0
[  580.240162]  [<ffffffff815bac57>] entry_SYSCALL_64_fastpath+0x12/0x6b
[  580.240187] ---[ end trace 3e2cbf34576c9878 ]---
[  580.281900] ------------[ cut here ]------------
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1459689261-7920-1-git-send-email-chris@chris-wilson.co.uk

Deal with errors from drm_universal_plane_init() in primary and cursor
plane init paths (sprites were already covered). Also make the code
neater by using goto for error handling.

v2: Rebased due to drm_universal_plane_init() 'name' parameter
v3: Another rebase due to s/""/NULL/
v4: Rebased on drm-nightly (Matthew Auld)
v5: Fix email address (Matthew Auld)
Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: NMatthew Auld <matthew.auld@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1458571402-32749-1-git-send-email-matthew.auld@intel.com

VLV DPLL is somewhat sane and doesn't run on luck.
Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1458052809-23426-7-git-send-email-ville.syrjala@linux.intel.comAcked-by: NJani Nikula <jani.nikula@intel.com>

Supposedly the power sequencer still locks out the DPLL registers on
CHV, so let's issue a warning if it's still locked when enabling the
DPLL.

Also drop the redundant IS_MOBILE() check for VLV when we check the same
thing.
Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1458052809-23426-6-git-send-email-ville.syrjala@linux.intel.comReviewed-by: NJani Nikula <jani.nikula@intel.com>

Avoid redundant crtc->pipe lookups by giving vlv_enable_pll() a local
pipe variable. Also makes it look more like the corresponding CHV code.

While at is change the CHV code to enum pipe from int,
Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1458052809-23426-5-git-send-email-ville.syrjala@linux.intel.comReviewed-by: NJani Nikula <jani.nikula@intel.com>

DPLL_MD(PIPE_C) is AWOL on CHV. Instead of fixing it someone added
chicken bits to propagate the pixel multiplier from DPLL_MD(PIPE_B)
to either pipe B or C. So do that to make pixel repeat work on pipes
B and C. Pipe A is fine without any tricks.

Fortunately the pixel repeat propagation appears to be a oneshot
operation, so once the value has been written we can clear the
chicken bits. So it is still possible to drive pipe B and C with
different pixel multipliers simultaneosly.

Looks like DPLL_VGA_MODE_DIS must also be set in DPLL(PIPE_B)
for this to work. But since we keep that bit always set in all
DPLLs there's no problem.

This of course means we can't reliably read out the pixel multiplier
for pipes B and C. That would make the state checker unhappy, so I
added shadow copies of those registers in to dev_priv. The other
option would have been to skip pixel multiplier, dpll_md an dotclock
checks entirely on CHV, but that feels like a serious loss of cross
checking, so just pretending that we have working DPLL MD registers
seemed better. Obviously with the shadow copies we can't detect if
the pixel multiplier was properly configured, nor can we take over
its state from the BIOS, but hopefully people won't have displays
that would be limitd to such crappy modes.

There is one strange flicker still remaining. It's visible on
pipe C/HDMID when HDMIB is enabled while driven by pipe B.
It doesn't occur if pipe A drives HDMIB, nor is there any glitch
on pipe B/HDMIB when port C/HDMID starts up. I don't have a board
with HDMIC so not sure if it happens there too. So I'm not sure
if it's somehow tied in with this strange linkage between pipe B
and C. Sadly I was unable to find an enable sequence that would
avoid the glitch, but at least it's not fatal ie. the output
recovers afterwards.
Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1458052809-23426-4-git-send-email-ville.syrjala@linux.intel.comReviewed-by: NJani Nikula <jani.nikula@intel.com>

The VLV and CHV DPLL disable and update are almost identical in
how the DPLL/DPLL_MD registers need to be set up. But the code
looks more different than it really is. Try to bring them into
line.

Note that we now leave the refclock always enabled for both
DPLLs in the dual channel PHY. But that's perfectly fine since
it's the same clock, and we anyway already do that when turning
the disp2d power well on.

v2: s/chv_update_pll/chv_compute_dpll/
v3: Add a note that we leave refclocks enabled for both DPLLs (Jani)
Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1458052809-23426-3-git-send-email-ville.syrjala@linux.intel.comReviewed-by: NJani Nikula <jani.nikula@intel.com>

These BUGs don't serve any purpose IMO. Throw them out.
Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1458052809-23426-2-git-send-email-ville.syrjala@linux.intel.comReviewed-by: NJani Nikula <jani.nikula@intel.com>

Bspec is confused w.r.t. the HSW/BDW FDI disable sequence. It lists
FDI RX disable both as step 13 and step 18 in the sequence. But I dug
up an old BUN mail from Art that moved the FDI RX disable to happen
before DDI_BUF_CTL disable. That BUN did not renumber the steps and just
added a note:
"Workaround: Disable PCH FDI Receiver before disabling DDI_BUF_CTL."

The BUN described the symptoms of the fixed issue as:
"PCH display underflow and a black screen on the analog CRT port that
happened after a FDI re-train"

I suppose later someone tried to renumber the steps to match, but forgot
to remove the FDI RX disable from its old position in the sequence.

They also forgot to update the note describing what should be done in
case of an FDI training failure. Currently it says:
"To retry FDI training, follow the Disable Sequence steps to Disable FDI,
but skip the steps related to clocks and PLLs (16, 19, and 20), ..."

It should really say "17, 20, and 21" with the current sequence because
those are the steps that deal with PLLs and whatnot, after step 13 became
FDI RX disable. And had the step 18 FDI RX disable been removed, as I
suspect it should have, the note should actually say "17, 19, and 20".

So, let's move the FDI RX disable to happen before DDI_BUF_CTL disable,
as that would appear to be the correct order based on the BUN.

Note that Art has since unconfused the spec, and so this patch should
now match the steps listed in the spec.

v2: Add a note that the spec is now correct

Cc: Paulo Zanoni <przanoni@gmail.com>
Cc: Art Runyan <arthur.j.runyan@intel.com>
Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1456841783-4779-1-git-send-email-ville.syrjala@linux.intel.comReviewed-by: NPaulo Zanoni <paulo.r.zanoni@intel.com>

This reverts commit a7442b93.

With the patch applied SNB, IVB and ILK are experiencing hard machine
hangs. Original patch was to fix "just" kernel panics so it's not a good
trade-off.

Proper fix for the panic is on the way, lets revert until then.

Fixes: a7442b93 ("drm/i915: Fix races on fbdev")
Cc: Lukas Wunner <lukas@wunner.de>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tomi Sarvela <tomi.p.sarvela@intel.com>
Cc: stable@vger.kernel.org
Acked-by: NLukas Wunner <lukas@wunner.de>
Tested-by: NTomi Sarvela <tomi.p.sarvela@intel.com>
Suggested-by: NChris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: NJoonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1459510861-29035-1-git-send-email-joonas.lahtinen@linux.intel.com

The DSI sequence blocks contain gpio index references, not actual gpio
numbers. No functional changes.
Reviewed-by: NMika Kahola <mika.kahola@intel.com>
Signed-off-by: NJani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/4a54778e56b507e8a0bd635ba02ed2a4734b00ac.1458299160.git.jani.nikula@intel.com

Make it easier to see which ports are configured for each phy. No
functional changes.
Signed-off-by: NJani Nikula <jani.nikula@intel.com>
Reviewed-by: NAnder Conselvan de Oliveira <conselvan2@gmail.com>
Signed-off-by: NImre Deak <imre.deak@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1459496681-398-1-git-send-email-jani.nikula@intel.com

According to the BSpec update, bit 7 of PORT_CL1CM_DW0 register needs to be
checked to ensure that the register is in accessible state.
Also, based on a BSpec update, changing the timeout value to
check iphypwrgood, from 10ms to wait for up to 100us.

v2: [Ville] use wait_for_us instead of the atomic call.
v3: [Jani/Imre] read register only once
Signed-off-by: NVandana Kannan <vandana.kannan@intel.com>
Reported-by: NPhilippe Lecluse <Philippe.Lecluse@intel.com>
Cc: Deak, Imre <imre.deak@intel.com>
Cc: Nikula, Jani <jani.nikula@intel.com>
Acked-by: NJani Nikula <jani.nikula@intel.com>
Reviewed-by: NImre Deak <imre.deak@intel.com>
Signed-off-by: NImre Deak <imre.deak@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1459446354-19012-1-git-send-email-vandana.kannan@intel.com

This patch checks for changes in sink count between short pulse
hpds and forces full detect when there is a change.

This will allow both detection of hotplug and unplug of panels
through dongles that give only short pulse for such events.

v2: changed variable type from u8 to bool (Jani)
    return immediately if perform_full_detect is set(Siva)

v3: changed method of determining full detection from using
    pointer to return code (Siva)

v4: changed comments to indicate meaning of return value of
    intel_dp_short_pulse and explain the use of return value
    from intel_dp_get_dpcd in intel_dp_short_pulse (Ander)
Tested-by: NNathan D Ciobanu <nathan.d.ciobanu@intel.com>
Signed-off-by: NSivakumar Thulasimani <sivakumar.thulasimani@intel.com>
Signed-off-by: NShubhangi Shrivastava <shubhangi.shrivastava@intel.com>
Reviewed-by: NAnder Conselvan de Oliveira <conselvan2@gmail.com>
Signed-off-by: NAnder Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1459341326-13142-5-git-send-email-shubhangi.shrivastava@intel.com

Sink count can change between short pulse hpd hence this patch
adds a member variable to intel_dp so we can track any changes
between short pulse interrupts.

This patch reads sink_count dpcd always and removes its
read operation based on values in downstream port dpcd.

SINK_COUNT dpcd is not dependent on DOWNSTREAM_PORT_PRESENT dpcd.
SINK_COUNT denotes if a display is attached, while
DOWNSTREAM_PORT_PRESET indicates how many ports are available
in the dongle where display can be attached. so it is possible
for sink count to change irrespective of value in downstream
port dpcd.

Here is a table of possible values and scenarios

sink_count      downstream_port
                present
0               0               no display is attached
0               1               dongle is connected without display
1               0               display connected directly
1               1               display connected through dongle

v2: Storing value of intel_dp->sink_count that is ready
    for consumption. (Ander)
    Squashing two commits into one. (Ander)

v3: Added comment to explain the need of early return when
    sink count is 0. (Ander)
Tested-by: NNathan D Ciobanu <nathan.d.ciobanu@intel.com>
Signed-off-by: NSivakumar Thulasimani <sivakumar.thulasimani@intel.com>
Signed-off-by: NShubhangi Shrivastava <shubhangi.shrivastava@intel.com>
Reviewed-by: NAnder Conselvan de Oliveira <conselvan2@gmail.com>
Signed-off-by: NAnder Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1459341326-13142-4-git-send-email-shubhangi.shrivastava@intel.com

When created originally intel_dp_check_link_status()
was supposed to handle only link training for short
pulse but has grown into handler for short pulse itself.
This patch cleans up this function by splitting it into
two halves. First intel_dp_short_pulse() is called,
which will be entry point and handle all logic for
short pulse handling while intel_dp_check_link_status()
will retain its original purpose of only doing link
status related work.

intel_dp_short_pulse: All existing code other than
link status read and link training upon error status.

intel_dp_check_link_status:
The link status should be read on short pulse
irrespective of panel being enabled or not so
intel_dp_get_link_status() performs dpcd read first
then based on crtc active / enabled it will
perform the link training.

This is because short pulse is a generic interrupt
which should always be handled, because it may mean:
	1. Hotplug/unplug of MST panel
	2. Hotplug/unplug of dongle
	3. Link status change for other DP panels

v2: Added WARN_ON to intel_dp_check_link_status()
    Removed a call to intel_dp_get_link_status() (Ander)

v3: Changed commit message to explain need of link status
    being read before performing encoder checks (Daniel)

v4: Changed commit message to explain need of reading
    link status on short pulse (Ander)
Tested-by: NNathan D Ciobanu <nathan.d.ciobanu@intel.com>
Signed-off-by: NSivakumar Thulasimani <sivakumar.thulasimani@intel.com>
Signed-off-by: NShubhangi Shrivastava <shubhangi.shrivastava@intel.com>
Reviewed-by: NAnder Conselvan de Oliveira <conselvan2@gmail.com>
[anderco: fix parenthesis alignment]
Signed-off-by: NAnder Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1459341326-13142-3-git-send-email-shubhangi.shrivastava@intel.com

Current DP detection has DPCD operations split across
intel_dp_hpd_pulse and intel_dp_detect which contains
duplicates as well. Also intel_dp_detect is called
during modes enumeration as well which will result
in multiple dpcd operations. So this patch tries
to solve both these by bringing all DPCD operations
in one single function and make intel_dp_detect
use existing values instead of repeating same steps.

v2: Pulled in a hunk from last patch of the series to
    this patch. (Ander)

v3: Added MST hotplug handling. (Ander)

v4: Added a flag to check if detect is performed to
    prevent multiple detects on hotplug. (Ander)
Tested-by: NNathan D Ciobanu <nathan.d.ciobanu@intel.com>
Signed-off-by: NSivakumar Thulasimani <sivakumar.thulasimani@intel.com>
Signed-off-by: NShubhangi Shrivastava <shubhangi.shrivastava@intel.com>
Reviewed-by: NAnder Conselvan de Oliveira <conselvan2@gmail.com>
[anderco: fix parenthesis aligment]
Signed-off-by: NAnder Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1459341326-13142-2-git-send-email-shubhangi.shrivastava@intel.com

intel_dp_detect() is called for not just detection but
during modes enumeration as well. Repeating the whole
sequence during each of these calls is wasteful and
time consuming.
This patch moves probing for panel, DPCD read etc done in
intel_dp_detect() to a new function intel_dp_long_pulse().
Note that the behavior of intel_dp_detect() is changed to
report connected or disconnected depending on whether the
EDID is available or not.
This change will be required by further patches in the series
to avoid performing duplicated DPCD operations on hotplug.

v2: Moved a hunk to next patch of the series.
    Moved intel_dp_unset_edid to out. (Ander)

v3: Rephrased commit message and intel_dp_unset_dp() is called
    within intel_dp_set_dp() to free the previous EDID. (Ander)

v4: Added overriding of status to disconnected for MST. (Ander)
Tested-by: NNathan D Ciobanu <nathan.d.ciobanu@intel.com>
Signed-off-by: NSivakumar Thulasimani <sivakumar.thulasimani@intel.com>
Signed-off-by: NShubhangi Shrivastava <shubhangi.shrivastava@intel.com>
Reviewed-by: NAnder Conselvan de Oliveira <conselvan2@gmail.com>
[anderco: fix parenthesis alignment]
Signed-off-by: NAnder Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1459341326-13142-1-git-send-email-shubhangi.shrivastava@intel.com

Refer to the GGTT VM consistently as "ggtt->base" instead of just "ggtt",
"vm" or indirectly through other variables like "dev_priv->ggtt.base"
to avoid confusion with the i915_ggtt object itself and PPGTT VMs.

Refer to the GGTT as "ggtt" instead of indirectly through chaining.

As a bonus gets rid of the long-standing i915_obj_to_ggtt vs.
i915_gem_obj_to_ggtt conflict, due to removal of i915_obj_to_ggtt!

v2:
- Added some more after grepping sources with Chris

v3:
- Refer to GGTT VM through ggtt->base consistently instead of ggtt_vm
  (Chris)

v4:
- Convert all dev_priv->ggtt->foo accesses to ggtt->foo.

v5:
- Make patch checker happy

Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: NJoonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: NChris Wilson <chris@chris-wilson.co.uk>

Without this a vblank may occur between updating color management
and planes, which should be prevented.

intel_color_set_csc was called in update pipe config because the
handover from hardware may not have any csc set, which resulted
in a black screen. Because of this also update color management
during fastset.
Signed-off-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Tested-by: NLionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: NLionel Landwerlin <lionel.g.landwerlin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1459350996-4957-4-git-send-email-maarten.lankhorst@linux.intel.com
[mlankhorst: Remove comment in response to review feedback.]

This is already tested by its callers.
Signed-off-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: NLionel Landwerlin <lionel.g.landwerlin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1459350996-4957-3-git-send-email-maarten.lankhorst@linux.intel.com

Signed-off-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: NLionel Landwerlin <lionel.g.landwerlin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1459350996-4957-2-git-send-email-maarten.lankhorst@linux.intel.com

With async modesets this is no longer protected with connection_mutex,
so ensure that each pll has its own lock. The pll configuration state
is still protected; it's only the pll updates that need locking against
concurrency.

Changes since v1:
- Rebased.
- Fix locking to protect all accesses. (Durgadoss)
Changes since v2:
- Make the dpll_lock global to protect concurrent updates to the
  same register, for example DPLL_CTRL1 on skl. (Ander)
Signed-off-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/56F29F50.1090708@linux.intel.comReviewed-by: NAnder Conselvan de Oliveira <conselvan2@gmail.com>

And move the comment to the right macro. This was mixed up in

commit cfb23ed6
Author: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Date:   Tue Jul 14 12:17:40 2015 +0200

    drm/i915: Allow fuzzy matching in pipe_config_compare, v2

v2: Rebase.

Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Daniel Stone <daniels@collabora.com>
Acked-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: NJani Nikula <jani.nikula@intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1459330476-32453-1-git-send-email-daniel.vetter@ffwll.ch

We now have KBL machines running in our CI systems and with no
blocking issues that could cause a full hangs or blank screens.
Signed-off-by: NRodrigo Vivi <rodrigo.vivi@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1459349881-951-1-git-send-email-rodrigo.vivi@intel.comAcked-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

This effectively reverts

commit 8e5fd599
Author: Ville Syrjälä <ville.syrjala@linux.intel.com>
Date:   Wed Apr 9 13:28:50 2014 +0300

    drm/i915/chv: Make CHV irq handler loop until all interrupts are consumed

as under continuous execlists load we can saturate the IRQ handler,
destablising the tsc clock and triggering the NMI watchdog to declare a hung
CPU.

[  552.756051] clocksource: timekeeping watchdog on CPU0: Marking clocksource 'tsc' as unstable because the skew is too large:
[  552.756080] clocksource:                       'refined-jiffies' wd_now: 10003b480 wd_last: 10003b28c mask: ffffffff
[  552.756091] clocksource:                       'tsc' cs_now: d55d31aa50 cs_last: d17446166c mask: ffffffffffffffff
[  552.756210] clocksource: Switched to clocksource refined-jiffies
[  575.217870] NMI watchdog: Watchdog detected hard LOCKUP on cpu 1
[  575.217893] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.5.0-rc7+ #18
[  575.217905] Hardware name:                  /NUC5CPYB, BIOS PYBSWCEL.86A.0027.2015.0507.1758 05/07/2015
[  575.217915]  0000000000000000 ffff88027fd05bc0 ffffffff81288c6d 0000000000000000
[  575.217935]  0000000000000001 ffff88027fd05be0 ffffffff810e72d1 0000000000000000
[  575.217951]  ffff88027fd05c80 ffff88027fd05c20 ffffffff81114b60 0000000181015f1e
[  575.217967] Call Trace:
[  575.217973]  <NMI>  [<ffffffff81288c6d>] dump_stack+0x4f/0x72
[  575.217994]  [<ffffffff810e72d1>] watchdog_overflow_callback+0x151/0x160
[  575.218003]  [<ffffffff81114b60>] __perf_event_overflow+0xa0/0x1e0
[  575.218016]  [<ffffffff811154c4>] perf_event_overflow+0x14/0x20
[  575.218028]  [<ffffffff8101d2ca>] intel_pmu_handle_irq+0x1da/0x460
[  575.218042]  [<ffffffff814a8aae>] ? poll_idle+0x3e/0x70
[  575.218052]  [<ffffffff814a8aae>] ? poll_idle+0x3e/0x70
[  575.218064]  [<ffffffff81014ae8>] perf_event_nmi_handler+0x28/0x50
[  575.218075]  [<ffffffff81007540>] nmi_handle+0x60/0x130
[  575.218086]  [<ffffffff814a8aae>] ? poll_idle+0x3e/0x70
[  575.218096]  [<ffffffff810079c0>] do_nmi+0x140/0x470
[  575.218108]  [<ffffffff81559ec7>] end_repeat_nmi+0x1a/0x1e
[  575.218119]  [<ffffffff814a8aae>] ? poll_idle+0x3e/0x70
[  575.218129]  [<ffffffff814a8aae>] ? poll_idle+0x3e/0x70
[  575.218139]  [<ffffffff814a8aae>] ? poll_idle+0x3e/0x70
[  575.218148]  <<EOE>>  [<ffffffff814a8353>] cpuidle_enter_state+0xf3/0x2f0
[  575.218164]  [<ffffffff814a8587>] cpuidle_enter+0x17/0x20
[  575.218175]  [<ffffffff810aaa3a>] call_cpuidle+0x2a/0x40
[  575.218185]  [<ffffffff810aade3>] cpu_startup_entry+0x273/0x330
[  575.218196]  [<ffffffff81033a1e>] start_secondary+0x10e/0x130

However, not servicing all available IIR within the handler does hurt the
throughput of pathological nop execbuf by about 20%, with a similar effect
upon the dispatch latency of a series of execbuf.

v2: use do {} while(0) for a smaller patch, and easier to revert again

I have reasonable confidence that we do not miss GT interrupts (as
execlists provides a stress case with a failure mechanism easily
detected by igt), however I have less confidence about all the other
sources of interrupts and worry that may lose a display hotplug
interrupt, for example.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=93467
Testcase: igt/gem_exec_nop/basic # requires NMI watchdog
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Antti Koskipää <antti.koskipaa@linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: stable@vger.kernel.org
Reviewed-by: NTvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1457946117-6714-1-git-send-email-chris@chris-wilson.co.uk