Now that the rps interrupt locking isn't clearly separated (at elast
conceptually) from all the other interrupt locking having a different
lock stopped making sense: It protects much more than just the rps
workqueue it started out with. But with the addition of VECS the
separation started to blurr and resulted in some more complex locking
for the ring interrupt refcount.

With this we can (again) unifiy the ringbuffer irq refcounts without
causing a massive confusion, but that's for the next patch.

v2: Explain better why the rps.lock once made sense and why no longer,
requested by Ben.
Reviewed-by: NBen Widawsky <ben@bwidawsk.net>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

And kill the comment about it. Queueing work is a barrier type event,
no amount of locking will help in ordering things (as long as we queue
the work after having updated all relevant data structures). Also, the
queue_work works itself as a sufficient memory barrier.

Again on the surface this is just a tiny micro-optimization to reduce
the hold-time of dev_priv->irq_lock. But the better reason is that it
reduces superficial locking and so makes it clearer what we actually
need for correctness.
Reviewed-by: NBen Widawsky <ben@bwidawsk.net>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

The if (pm_iir & ~GEN6_PM_RPS_EVENTS) check was redunandant. Otoh
adding a check for rps events allows us to avoid the spinlock grabbing
for VECS interrupts.

v2: Drop misplaced hunk which now moved to the right patch.
Reviewed-by: NBen Widawsky <ben@bwidawsk.net>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

Since we only have one interrupt handler and interrupt handlers are
non-reentrant.

To drive the point really home give them all an _irq_handler suffix.

This is a tiny micro-optimization but even more important it makes it
clearer what locking we actually need. And in case someone screws this
up: lockdep will catch hardirq vs. other context deadlocks.

v2: Fix up compile fail.
Reviewed-by: NPaulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: NBen Widawsky <ben@bwidawsk.net>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

It's racy: There's no guarantee that we won't walk this code (due to a
pch fifo underrun interrupt) while someone is changing the pointers
around.

The only reason we do this is to use the righ crtc for the pch fifo
underrun accounting. But we never expose this to userspace, so
essentially no one really cares if we use the "wrong" crtc.

So let's just rip it out.

With this patch fifo underrun code will always use crtc A for tracking
underruns on the (only) pch transcoder on LPT.

v2: Add a big comment explaining what's going on. Requested by Paulo.

v3: Fixup spelling in comment as spotted by Paulo.

Cc: Paulo Zanoni <przanoni@gmail.com>
Reviewed-by: NPaulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

Same treatment as for SERR_INT: If we clear only the bit for the pipe
we're enabling (but unconditionally) then we can always check for
possible underruns after having disabled the interrupt. That way pipe
underruns won't be lost, but at worst only get reported in a delayed
fashion.

v2: The same logic bug as in the SERR handling change also existed
here. The same bugfix of only reporting missed underruns when the
error interrupt was masked applies, too.

v3: Do the same fixes as for the SERR handling that Paulo suggested in
his review:
- s/%i/%c/ fix in the debug output
- move the DE_ERR_INT_IVB read into the respective if block

Cc: Paulo Zanoni <przanoni@gmail.com>
Reviewed-by: NPaulo Zanoni <paulo.r.zanoni@intel.com>
[danvet: Fix up the checkpatch bikeshed Paulo noticed.]
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

The current code won't report any fifo underruns on cpt if just one
pipe has fifo underrun reporting disabled. We can't enable the
interrupts, but we can still check the per-transcoder bits and so
report the underrun delayed if:
- We always clear the transcoder's bit (and none of the other bits)
  when enabling.
- We check the transcoder's bit after disabling (to avoid racing with
  the interrupt handler).

v2: I've forgotten to actually remove the old SERR_INT clearing.

v3: Use transcoder_name as suggested by Paulo Zanoni. Paulo also
noticed a logic bug: When an underrun interrupt fires we report it
both in the interrupt handler and when checking for underruns when
disabling it in cpt_set_fifo_underrun_reporting. But that second check
is only required if the interrupt is disabled and we're switching of
underrun reporting (e.g. because we're disabling the crtc). Hence
check for that condition.

At first I wanted to rework the code to pass that bit of information
from the uppper functions down to cpt_set_fifo_underrun_reporting. But
that turned out too messy. Hence the quick&dirty check whether the
south error interrupt source is masked off or not.

v4: Streamline the control flow a bit.

v5: s/pipe/pch transcoder/ in the dmesg output, suggested by Paulo.

v6: Review from Paulo:
- Reorder the was_enabled assignment to only read the register when we
  need it. Also add a comment that we need to do that before updating
  the register.
- s/%i/%c/ fix for the debug output.
- Fix the checkpath complaint in the SERR_INT_TRANS_FIFO_UNDERRUN
  #define.

v7: Hopefully put that elusive SERR hunk back into this patch, spotted
by Paulo.

Cc: Paulo Zanoni <przanoni@gmail.com>
Reviewed-by: NPaulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

This way all changes to SDEIMR all go through the same function, with
the exception of the (single-threaded) setup/teardown code.

For paranoia again add an assert_spin_locked.

v2: For even more paranoia also sprinkle a spinlock assert over
cpt_can_enable_serr_int since we need to have that one there, too.

v3: Fix the logic of interrupt enabling, add enable/disable macros for
the simple cases in the fifo code and add a comment. All requested by
Paulo.
Reviewed-by: NPaulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

Signed-off-by: NMaarten Lankhorst <maarten.lankhorst@canonical.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

In kernel modeset driver mode we're in full control of the chip,
always. So there's no need at all to set mm.suspended in
i915_gem_idle. Hence move that out into the leavevt ioctl. Since
i915_gem_idle doesn't suspend gem any more we can also drop the
re-enabling for KMS in the thaw function.

Also clean up the handling of mm.suspend at driver load by coalescing
all the assignments.

Stumbled over while reading through our resume code for unrelated
reasons.

v2: Shovel mm.suspended into the (newly created) ums dungeon as
suggested by Chris Wilson. The plan is that once we've completely
stopped relying on the register save/restore code we could shovel even
that in there.

v3: Improve the locking for the entervt/leavevt ioctls a bit by moving
the dev->struct_mutex locking outside of i915_gem_idle. Also don't
clear dev_priv->ums.mm_suspended for the kms case, we allocate it with
kzalloc. Both suggested by Chris Wilson.

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> (v2)
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

I just got confirmation that we're using some old values for the PLL
LPF coefficients for DP RBR/HDMI/DAC on VLV. The
VLV2A0_DP_eDP_HDMI_DPIO_driver_vbios_notes_9 document lists both values
by mistake, and apparently we had picked the wrong one. Change the
coefficients to the recommended values.

Changing the value doesn't appear to destabilize the VGA output picture
even with my sensitive HP ZR24w display. Also HDMI output to my TV still
works fine.
Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: NJesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

v2: Bail out if we hit the WARN_ON to avoid fallout later on. Spotted
by Chris Wilson.
Suggested-by: NChris Wilson <chris@chris-wilson.co.uk>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: NChris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

Originally I've thought that this fixes up the reset issues on my
gm45, but that was just a red herring due to b0rked testing.

Still I much prefer writing the right values (all other fields are
reserved) instead of potentially dragging gunk around. Hence also
clear the register to 0 after a reset.

Note that Cspec is a bit confused and doesn't explicitly say that all
the other bits in this register are "reserved, mbz" like usually.
Instead they're marked as "r/o, default value = 0" which semantically
amounts to the same thing.

v2: Stop claiming this fixes anything and return 0 if successful
instead of stack garbage.

v3: Pimp the commit message to explain exactly why I think the docs
allow us to ditch the rmw cycle, spurred by a discussion with Chris.

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: NChris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

Sanity check that the memory region found through the Graphics Base
of Stolen Memory is reserved and hidden from the rest of the system
through the use of the resource API.

v2: "Graphics Stolen Memory" is such a more bodacious name than the lame
    "i915 stolen", and convert to using devres for automagical cleanup of
    the resource. (danvet)
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
[danvet: Dump proper hexcodes.]
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

At least for the common cases where we only need special file
operations. The forcewake file is still rather more special.

v2: Fix up the debugfs unregister code.

v3: Actually squash in the right fixup.
Acked-by: NBen Widawsky <ben@bwidawsk.net>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

Section 1.5.4, "DPLL A Control Register" from Bspec about bit 23
"FPA0/A1 P2 Clock Divide":

0 = Divide by 2
1 = Divide by 4. This bit must be set in DVO non-gang mode

So copy the current limits (which should be good for i8xx) and create
a new set for dvo encoders.
Reviewed-by: NChris Wilson <chris@chris-wilson.oc.uk>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

I've missed that intel_dvo_mode_set changes the dpll configuration.
Hence when I've reworked the sequence to only enable the dpll in the
crtc_enable callback in

commit 66e3d5c0
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Sun Jun 16 21:24:16 2013 +0200

    drm/i915: move i9xx dpll enabling into crtc enable function

that special DVO bit was lost. Some BSpec reading confirms that it's
only needed for DVO encoders. Section 1.5.4, "DPLL A Control Register"
for bit 30:

"2X Clock Enable. When driving In non-gang DVO modes such as a
connected flat panel or TV, a 2X" version of the clock is needed. When
not using the 2X output it should be disabled. This bit cannot be set
when driving the integrated LVDS port on devices such as Montara-GM."

Fix this regression up.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=66516
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reported-by: NChris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: NChris Wilson <chris@chris-wilson.co.uk>
Partially-tested-by: NChris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

Embedding the node in the obj is more natural in the transition to VMAs
which will also have embedded nodes. This change also helps transition
away from put_block to remove node.

Though it's quite an uncommon occurrence, it's somewhat convenient to not
fail at bind time because we cannot allocate the node. Though in
practice there are other allocations (like the request structure) which
would probably make this point not terribly useful.

Quoting Daniel:
Note that the only difference between put_block and remove_node is
that the former fills up the preallocation cache. Which we don't need
anyway and hence is just wasted space.

v2: Clean up the stolen preallocation code.
Rebased on the reserve_node patches
renames ggtt_ stuff to gtt_ stuff
WARN_ON if the object is already bound (which doesn't mean it's in the
bound list, tricky)
Signed-off-by: NBen Widawsky <ben@bwidawsk.net>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

With the getters in place from the previous patch this members serves no
purpose other than saving one spare pointer chase, which will be killed
in the next patch anyway.

Moving to VMAs, this members adds unnecessary confusion since an object
may exist at different offsets in different VMs.

v2: Properly preserve the stolen offset. This code is a bit hacky but it
all goes away when we embed the drm_mm_node and removes the need for the
incorrect patch I submitted previously: "Use gtt_space->start for stolen
reservation"
Signed-off-by: NBen Widawsky <ben@bwidawsk.net>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

Soon we want to gut a lot of our existing assumptions how many address
spaces an object can live in, and in doing so, embed the drm_mm_node in
the object (and later the VMA).

It's possible in the future we'll want to add more getter/setter
methods, but for now this is enough to enable the VMAs.

v2: Reworked commit message (Ben)
Added comments to the main functions (Ben)
sed -i "s/i915_gem_obj_set_color/i915_gem_obj_ggtt_set_color/" drivers/gpu/drm/i915/*.[ch]
sed -i "s/i915_gem_obj_bound/i915_gem_obj_ggtt_bound/" drivers/gpu/drm/i915/*.[ch]
sed -i "s/i915_gem_obj_size/i915_gem_obj_ggtt_size/" drivers/gpu/drm/i915/*.[ch]
sed -i "s/i915_gem_obj_offset/i915_gem_obj_ggtt_offset/" drivers/gpu/drm/i915/*.[ch]
(Daniel)

v3: Rebased on new reserve_node patch
Changed DRM_DEBUG_KMS to actually work (will need fixing later)
Signed-off-by: NBen Widawsky <ben@bwidawsk.net>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

With the previous patch we no longer actually create a node, we simply
find the correct hole and occupy it. This very well could have been
squashed with the last patch, but since I already had David's review, I
figured it's easiest to keep it distinct.

Also update the users in i915. Conveniently this is the only user of the
interface.

CC: David Airlie <airlied@linux.ie>
CC: <dri-devel@lists.freedesktop.org>
Signed-off-by: NBen Widawsky <ben@bwidawsk.net>
Acked-by: NDavid Airlie <airlied@linux.ie>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

For an upcoming patch where we introduce the i915 VMA, it's ideal to
have the drm_mm_node as part of the VMA struct (ie. it's pre-allocated).
Part of the conversion to VMAs is to kill off obj->gtt_space. Doing this
will break a bunch of code, but amongst them are 2 callers of
drm_mm_create_block(), both related to stolen memory.

It also allows us to embed the drm_mm_node into the object currently
which provides a nice transition over to the new code.

v2: Reordered to do before ripping out obj->gtt_offset.
Some minor cleanups made available because of reordering.

v3: s/continue/break on failed stolen node allocation (David)
Set obj->gtt_space on failed node allocation (David)
Only unref stolen (fix double free) on failed create_stolen (David)
Free node, and NULL it in failed create_stolen (David)
Add back accidentally removed newline (David)

CC: <dri-devel@lists.freedesktop.org>
Reviewed-by: NDavid Herrmann <dh.herrmann@gmail.com>
Signed-off-by: NBen Widawsky <ben@bwidawsk.net>
Acked-by: NDavid Airlie <airlied@linux.ie>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

Just to keep the paranoia equal also sprinkle locking asserts over the
pipestat interrupt enable/disable functions.

Again this results in false positives in the interrupt setup. Add
bogo-locking for these and a big comment explaining why it's there and
that it's indeed unnecessary.

v2: Fix up the spelling fail Paulo spotted in comments.
Reviewed-by: NPaulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

A magic -1 is a obscure, especially since it's actually passed as an
unsigned, so depends upon the magic sign extension rules in C. This has
been added in

commit 3727d55e
Author: Jesse Barnes <jbarnes@virtuousgeek.org>
Date:   Wed May 8 10:45:14 2013 -0700

    drm/i915: allow stolen, pre-allocated objects to avoid GTT allocation v2

Use a proper #define instead. Spotted while reviewing Ben's
drm_mm_create_block changes.

v2: Cast the constant to u32 since otherwise we again have a type
mismatch. Suggested by Chris Wilson.

Cc: Ben Widawsky <ben@bwidawsk.net>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: NChris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

We only do this on IBX where there's a fixed pch dpll to pipe
assignment. Being explicit about it can't really hurt and makes
sparse happy.
Reviewed-by: NDamien Lespiau <damien.lespiau@intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

This makes sparse happy and also makes it a bit more obvious where we
pull off this trick - after all we're only allowed to do it eithe as a
default or on platforms where there is no disdinction between the pipe
and the cpu transcoder.
Reviewed-by: NDamien Lespiau <damien.lespiau@intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

Use wait_for() instead of the open coded loop to avoid spreading the
same old timeout related bugs.

This changes the loop to use msleep(1) instead of udelay(10) when the
Punit had not yet completed the frequency change. In practice that
doesn't seem to hurt performance as the Punit appears to be ready pretty
much always.

Also give the status bit a name, instead of using the magic number 1.
Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: NJesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

This should help on HSW, where we don't currently have a get_clock call.
Reported-by: NPaulo Zanoni <przanoni@gmail.com>
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

Print out the flag that failed and fix up a mismatched paren.
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

As getting error state doesn't anymore require big kmallocs,
make error state accessible also from sysfs.

v2: - error state clearing (Chris Wilson)
    - user hint, proper access mode bits and name (Daniel Vetter)

v3: release resources in proper order (Chris Wilson)
Suggested-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: NMika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: NChris Wilson <chris@chris-wilson.co.uk>
[danvet: Apply Chris' s/error_state/error/ bikeshed on the sysfs
name. Also update the dmesg message, spotted by Chris.]
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

Make function for struct i915_error_state_buf initialization
and export it, for sysfs and debugfs.
Signed-off-by: NMika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: NChris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

In preparation for sysfs error state access,
export ref error state ref counting interface.
Signed-off-by: NMika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: NChris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

In preparation for accessing error state from sysfs, export
error state to string conversion function. Also tuck buffer
error handling inside the function.
Signed-off-by: NMika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: NChris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

If the crtc is active, we can simply flip a new fb onto it, provided the
other mode setting reqs are met.  Otherwise, we'll need to do a full
mode set to re-enable the crtc.

v2: check for crtc active and set mode_changed accordingly
v3: add module parameter, i915.fastboot, to control no fb -> fb flip behavior
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

Need better pfit tracking to do this right.

v2: use fastboot param around this hack
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

We already fetch and track other state into the main CRTC and encoder
structs, and for fastboot we need to do the same with the mode and clock
data we read out.

v2: fix debug print
v3: use fastboot param around state copy
v4: set clock and flags for crtc here instead of in setup_hw_state
v5: rename function to intel_crtc_mode_from_pipe_config for consistency (Chris)
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

We need this for comparing modes between configuration changes.

The tricky part is to allow us to reuse the new get_clock stuff to
recover the lvds clock on gen2/3 when neither the vbt has an lvds mode
nor the panel a (useful) EDID.

v2: try harder to calulate non-simple pixel clocks (Daniel)
    call get_clock after getting the encoder config, needed for pixel multiply
    (Jesse)
v3: drop get_clock now that the pixel_multiply has been moved into
    get_pipe_config
v4: re-add get_clock; we need to get the pixel multiplier in the
    encoder, so need to calculate the clock value after the encoder's
    get_config is called
v5: drop hsw clock_get, still needs to be written
v6: add fuzzy clock check (Daniel)
v7: wrap fuzzy clock check under !IS_HASWELL
    use port_clock field rather than a new CPU eDP clock field in crtc_config
v8: remove stale pixel_multiplier sets (Daniel)
    multiply by pixel_multiplier in 9xx clock get too (Daniel)
v9: make sure we set pixel_multiplier before calling clock_get from mode_get
    for LVDS (Daniel)
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>
[danvet: Add some explanation to the commit message about why we have
to jump through a few hoops. Also remove the rebase-fail hunk from
intel_sdvo.c]
[danvet: Squash in the fixup from Jesse to also call ->get_clock in
the modeset state checker.]
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

Handling all the state properly for fastboot is still not yet done by
far, but we need some way to be able to test what we currently have.
So hide the not-yet-quite-complete stuff behind a module option.
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>
[danvet: Add a real commit message.]
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

Now that we painstakingly track the shared pch dplls we can finally
implement pixel mutliplier readout support for pch ports, too.

v2: Undo the temporary hack to disable the sdvo pixel multiplier
cross-checking.

Cc: Imre Deak <imre.deak@intel.com>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: NJesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

for file in `ls drivers/gpu/drm/i915/*.c` ; do
	sed -i "s/mm.gtt_mtrr/gtt.mtrr/" $file;
done
Signed-off-by: NBen Widawsky <ben@bwidawsk.net>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>