In case of using MIPI DSI based I80 interface panel,
the relevant registers should be set.
So this patch adds relevant DT bindings.

Signed-off-by: YoungJun Cho <yj44.cho@samsung.com>
Acked-by: Inki Dae <inki.dae@samsung.com>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

There could be the case that the page flip operation isn't finished correctly
with some abnormal condition such as panel reset. So this patch replaces
wait_event() with wait_event_timeout() to avoid waiting for page flip completion
infinitely.
And clears exynos_crtc->pending_flip in exynos_drm_crtc_page_flip()
when exynos_drm_crtc_mode_set_commit() is failed.

Signed-off-by: YoungJun Cho <yj44.cho@samsung.com>
Acked-by: Inki Dae <inki.dae@samsung.com>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

This configuration could be used in MIPI DSI command mode also.
And adds user manual description for display configuration.

Signed-off-by: YoungJun Cho <yj44.cho@samsung.com>
Acked-by: Inki Dae <inki.dae@samsung.com>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

Configuration sets for Exynos 4210 and 4x12 SoC were already defined in
Exynos HDMI and Mixed drivers, but they lacked proper linking to device
tree 'compatible' values. This patch fixes this issue adding support for
following compatible values: samsung,exynos4210-mixer,
samsung,exynos4212-mixer and samsung,exynos4210-hdmi. It also corrects
access to sclk_mixer clock, which is available only on Exynos 4210.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

HDMI_EN regulator is additional regulator for providing voltage source
for DCC lines available on HDMI connector. When there is no power
provided for DDC epprom, some TV-sets do not pulls up HPD (hot plug
detect) line, what causes HDMI block to stay turned off. This patch
enables HDMI_EN regulator (if available) on driver probe and keep it
enabled all the time to let TV-set correctly signal HPD event.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

According to the header comment in the source file, the driver is
licensed under GPL v2, so update MODULE_LICENSE() to match that.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

'exynos_gem_obj' is not used in the function. Remove it.

Signed-off-by: Sachin Kamat <sachin.kamat@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

'frame_size_code' is not used in the function. Remove it.

Signed-off-by: Sachin Kamat <sachin.kamat@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

Fix a NULL pointer exception when main exynos drm driver was probed
successfully but no components were added (e.g. by incomplete DTS). In
such case the exynos_drm_load() is never called and drvdata is NULL.

The NULL pointer exception may theoretically also happen as a effect of race between
adding components and main driver: if suspend of the driver happens
before adding components.

Trace:
[    1.190295] [drm] Initialized drm 1.1.0 20060810
[    1.195209] exynos-drm-ipp exynos-drm-ipp: drm ipp registered successfully.
(...)
[   24.001743] PM: Syncing filesystems ... done.
[   24.002177] Freezing user space processes ... (elapsed 0.000 seconds) done.
[   24.007403] Freezing remaining freezable tasks ... (elapsed 0.001 seconds) done.
[   24.032559] Unable to handle kernel NULL pointer dereference at virtual address 00000134
[   24.035007] pgd = dedd8000
[   24.037734] [00000134] *pgd=5ee13831, *pte=00000000, *ppte=00000000
[   24.043953] Internal error: Oops: 17 [#1] PREEMPT SMP ARM
[   24.049329] Modules linked in:
[   24.052371] CPU: 0 PID: 1 Comm: sh Not tainted 3.16.0-rc3-00035-geba20bbdde04-dirty #51
[   24.060354] task: df478000 ti: df480000 task.ti: df480000
[   24.065743] PC is at mutex_lock+0x10/0x50
[   24.069733] LR is at drm_modeset_lock_all+0x30/0xbc
[   24.074590] pc : [<c048516c>]    lr : [<c02a14b4>]    psr: a0000013
[   24.074590] sp : df481db8  ip : 00000000  fp : c05e524c
[   24.086045] r10: 00000002  r9 : c02c1fe4  r8 : deca5e44
[   24.091253] r7 : 00000000  r6 : 00000000  r5 : 0000014c  r4 : 00000134
[   24.097763] r3 : 00000000  r2 : 00000000  r1 : 00000000  r0 : 00000134
[   24.104275] Flags: NzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
[   24.111391] Control: 10c53c7d  Table: 5edd806a  DAC: 00000015
[   24.117120] Process sh (pid: 1, stack limit = 0xdf480240)
[   24.122502] Stack: (0xdf481db8 to 0xdf482000)
[   24.126843] 1da0:                                                       dee01d80 c02a14b4
[   24.135004] 1dc0: 00000000 00000000 c07aff98 c02aec7c 00000002 00000000 00000000 c07aff98
[   24.143164] 1de0: deca5e10 c02aecf4 c02aecd4 c02c2010 00000000 c02c9470 00000000 00000000
[   24.151322] 1e00: 00000000 00000000 deca5e10 deca5e10 00000000 c07aff98 00000002 deca5e44
[   24.159482] 1e20: c06d8f78 c06fb800 deca5e78 c02ca660 df7baf00 007b0aa0 deca5e10 c06fb7c8
[   24.167641] 1e40: c07aff98 00000000 00000002 c02cbe18 9757aec5 00000005 9757aec5 00000005
[   24.175801] 1e60: ded1d380 00000003 00000003 c05c74d8 ded1d380 c07209d4 c05c7514 c07105d8
[   24.183960] 1e80: 01e2a738 c0068a74 00000000 c05c7514 ded1d380 c071c6e0 00000004 c07105d8
[   24.192119] 1ea0: 01e2a738 c047f1e0 c0600cc0 df481ec4 00000003 00000000 00000003 c05c74d8
[   24.200278] 1ec0: ded1d380 c071c6e0 c05c7514 c07105d8 01e2a738 c0069444 c06d905c 00000003
[   24.208438] 1ee0: 00000003 ded1d380 c06d9064 00000004 c05c3fc0 c0067d4c df535ab0 ded1d380
[   24.216596] 1f00: df481f80 ded1d380 00000004 ded1d1cc ded1d1c0 c0221724 00000004 c016ca6c
[   24.224756] 1f20: c016ca28 00000000 00000000 c016c1d4 00000000 00000000 b6f37000 df481f80
[   24.232915] 1f40: decedd80 00000004 df480000 df480000 b6f37000 c0110920 df47839c 60000013
[   24.241074] 1f60: 00000000 00000000 decedd80 decedd80 00000004 df480000 b6f37000 c0110da8
[   24.249233] 1f80: 00000000 00000000 00000004 b6edf5d8 00000004 b6f37000 00000004 c000f2a8
[   24.257393] 1fa0: 00001000 c000f0e0 b6edf5d8 00000004 00000001 b6f37000 00000004 00000000
[   24.265551] 1fc0: b6edf5d8 00000004 b6f37000 00000004 00000004 00000001 00000000 01e2a738
[   24.273711] 1fe0: 00000000 beba0a20 b6e1f4f0 b6e7022c 60000010 00000001 ffffffff ffffffff
[   24.281885] [<c048516c>] (mutex_lock) from [<c02a14b4>] (drm_modeset_lock_all+0x30/0xbc)
[   24.289950] [<c02a14b4>] (drm_modeset_lock_all) from [<c02aec7c>] (exynos_drm_suspend+0xc/0x64)
[   24.298627] [<c02aec7c>] (exynos_drm_suspend) from [<c02aecf4>] (exynos_drm_sys_suspend+0x20/0x34)
[   24.307568] [<c02aecf4>] (exynos_drm_sys_suspend) from [<c02c2010>] (platform_pm_suspend+0x2c/0x54)
[   24.316597] [<c02c2010>] (platform_pm_suspend) from [<c02c9470>] (dpm_run_callback+0x48/0x170)
[   24.325188] [<c02c9470>] (dpm_run_callback) from [<c02ca660>] (__device_suspend+0x128/0x39c)
[   24.333606] [<c02ca660>] (__device_suspend) from [<c02cbe18>] (dpm_suspend+0x5c/0x314)
[   24.341506] [<c02cbe18>] (dpm_suspend) from [<c0068a74>] (suspend_devices_and_enter+0x8c/0x598)
[   24.350185] [<c0068a74>] (suspend_devices_and_enter) from [<c0069444>] (pm_suspend+0x4c4/0x5d0)
[   24.358862] [<c0069444>] (pm_suspend) from [<c0067d4c>] (state_store+0x70/0xd4)
[   24.366156] [<c0067d4c>] (state_store) from [<c0221724>] (kobj_attr_store+0x14/0x20)
[   24.373885] [<c0221724>] (kobj_attr_store) from [<c016ca6c>] (sysfs_kf_write+0x44/0x48)
[   24.381867] [<c016ca6c>] (sysfs_kf_write) from [<c016c1d4>] (kernfs_fop_write+0xc0/0x17c)
[   24.390027] [<c016c1d4>] (kernfs_fop_write) from [<c0110920>] (vfs_write+0xa0/0x1c4)
[   24.397750] [<c0110920>] (vfs_write) from [<c0110da8>] (SyS_write+0x40/0x8c)
[   24.404782] [<c0110da8>] (SyS_write) from [<c000f0e0>] (ret_fast_syscall+0x0/0x3c)
[   24.412332] Code: e92d4010 e1a04000 f57ff05b f590f000 (e1903f9f)
[   24.418448] ---[ end trace cfa06690eabe8dd5 ]---
[   24.423032] Kernel panic - not syncing: Fatal exception
[   24.428220] CPU1: stopping
[   24.430905] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G      D       3.16.0-rc3-00035-geba20bbdde04-dirty #51
[   24.440549] [<c0016440>] (unwind_backtrace) from [<c001294c>] (show_stack+0x10/0x14)
[   24.448269] [<c001294c>] (show_stack) from [<c04811e8>] (dump_stack+0x80/0xcc)
[   24.455472] [<c04811e8>] (dump_stack) from [<c001495c>] (handle_IPI+0x130/0x15c)
[   24.462850] [<c001495c>] (handle_IPI) from [<c000862c>] (gic_handle_irq+0x60/0x68)
[   24.470400] [<c000862c>] (gic_handle_irq) from [<c0013440>] (__irq_svc+0x40/0x70)
[   24.477860] Exception stack(0xdf4bdf88 to 0xdf4bdfd0)
[   24.482898] df80:                   ffffffed 00000000 00000000 00000000 df4bc000 c06d042c
[   24.491058] dfa0: 00000000 ffffffed c06d03c0 00000000 c070c288 00000000 00000000 df4bdfd0
[   24.499214] dfc0: c0010324 c0010328 60000013 ffffffff
[   24.504254] [<c0013440>] (__irq_svc) from [<c0010328>] (arch_cpu_idle+0x28/0x30)
[   24.511634] [<c0010328>] (arch_cpu_idle) from [<c005f110>] (cpu_startup_entry+0x2c4/0x3f0)
[   24.519878] [<c005f110>] (cpu_startup_entry) from [<400086c4>] (0x400086c4)
[   24.526821] ---[ end Kernel panic - not syncing: Fatal exception

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

The VFS layer handles those in the very same way, if unset. No need for
additional stubs.

Signed-off-by: Mathias Krause <minipli@googlemail.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Dave Airlie <airlied@redhat.com>

Linux doesn't run on i386, anymore. See:

    commit d55c5a93


    Author: H. Peter Anvin <hpa@linux.intel.com>
    Date:   Wed Nov 28 11:50:24 2012 -0800

        x86, 386 removal: Remove CONFIG_CMPXCHG

        All 486+ CPUs support CMPXCHG, so remove the fallback 386 support
        code.

Furthermore, as the commit-message states, all 486+ CPUs support the
CMPXCHG instruction and thus even legacy DRM can run fine.

Drop the now superfluous "x86 == 3" check.

Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

This object is unused, drop it.

Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@redhat.com>

This object is not used except for static fields in drm_bufs *cough*.
Inline the watermark fields and drop the unused structure definition.

Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@redhat.com>

The maximum pitch constraint for the hardware is expressed in pixels.
Convert it to bytes to validate frame buffer creation, as frame buffer
pitches are expressed in bytes.

Reported-by: Phil Edworthy <phil.edworthy@renesas.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

This chunk was no longer required from what I can see, or
at least it is doing the wrong thing, as I confused
intel_connector->encoder and connector->encoder. Drop it
for now, to remove the warnings at bootup.

Signed-off-by: Dave Airlie <airlied@redhat.com>

When I moved the irq disable down to after display disable,
I didn't realise the gt suspend also required irqs off, so move it
down as well.

Fixes WARNs seen at suspend/resume time.

v2: moved the rps flush down as well.

Tested-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

pull the msm patch in.
* 'component-for-drm' of git://ftp.arm.linux.org.uk/~rmk/linux-arm:
  drm: msm: update to use component match support

Merge armada changes, I've confirmed the componenet changes are same as in Greg's tree.
* 'drm-armada-devel' of git://ftp.arm.linux.org.uk/~rmk/linux-arm:
  drm/armada: register crtc with port
  drm/armada: permit CRTCs to be registered as separate devices
  dt-bindings: add Marvell Dove LCD controller documentation
  drm/armada: update Armada 510 (Dove) to use "ext_ref_clk1" as the clock
  drm/armada: convert to componentized support
  drm: add of_graph endpoint helper to find possible CRTCs
  component: fix bug with legacy API
  drm/armada: make variant a CRTC thing
  drm/armada: move variant initialisation to CRTC init
  drm/armada: use number of CRTCs registered
  drm/armada: move IRQ handling into CRTC
  component: add support for component match array
  component: ignore multiple additions of the same component
  component: fix missed cleanup in case of devres failure

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Dave Airlie <airlied@redhat.com>

fixes sparse warning, and removes potentially dangerous name from namespace.

Signed-off-by: Dave Airlie <airlied@redhat.com>

fixes sparse warning.

Signed-off-by: Dave Airlie <airlied@redhat.com>

Regular randconfig nightly testing has detected problems with omapdrm.

omapdrm fails to build when the kernel is built to support 64-bit DMA
addresses and/or 64-bit physical addresses due to an assumption about
the width of these types.

Use %pad to print DMA addresses, rather than %x or %Zx (which is even
more wrong than %x).  Avoid passing a uint32_t pointer into a function
which expects dma_addr_t pointer.

drivers/gpu/drm/omapdrm/omap_plane.c: In function 'omap_plane_pre_apply':
drivers/gpu/drm/omapdrm/omap_plane.c:145:2: error: format '%x' expects argument of type 'unsigned int', but argument 5 has type 'dma_addr_t' [-Werror=format]
drivers/gpu/drm/omapdrm/omap_plane.c:145:2: error: format '%x' expects argument of type 'unsigned int', but argument 6 has type 'dma_addr_t' [-Werror=format]
make[5]: *** [drivers/gpu/drm/omapdrm/omap_plane.o] Error 1
drivers/gpu/drm/omapdrm/omap_gem.c: In function 'omap_gem_get_paddr':
drivers/gpu/drm/omapdrm/omap_gem.c:794:4: error: format '%x' expects argument of type 'unsigned int', but argument 3 has type 'dma_addr_t' [-Werror=format]
drivers/gpu/drm/omapdrm/omap_gem.c: In function 'omap_gem_describe':
drivers/gpu/drm/omapdrm/omap_gem.c:991:4: error: format '%Zx' expects argument of type 'size_t', but argument 7 has type 'dma_addr_t' [-Werror=format]
drivers/gpu/drm/omapdrm/omap_gem.c: In function 'omap_gem_init':
drivers/gpu/drm/omapdrm/omap_gem.c:1470:4: error: format '%x' expects argument of type 'unsigned int', but argument 7 has type 'dma_addr_t' [-Werror=format]
make[5]: *** [drivers/gpu/drm/omapdrm/omap_gem.o] Error 1
drivers/gpu/drm/omapdrm/omap_dmm_tiler.c: In function 'dmm_txn_append':
drivers/gpu/drm/omapdrm/omap_dmm_tiler.c:226:2: error: passing argument 3 of 'alloc_dma' from incompatible pointer type [-Werror]
make[5]: *** [drivers/gpu/drm/omapdrm/omap_dmm_tiler.o] Error 1
make[5]: Target `__build' not remade because of errors.
make[4]: *** [drivers/gpu/drm/omapdrm] Error 2

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Dave Airlie <airlied@redhat.com>

Regular nightly randconfig build testing discovered these warnings:

drivers/gpu/drm/bochs/bochs_drv.c:100:12: warning: 'bochs_pm_suspend' defined but not used [-Wunused-function]
drivers/gpu/drm/bochs/bochs_drv.c:117:12: warning: 'bochs_pm_resume' defined but not used [-Wunused-function]

Fix these by adding the same condition that SET_SYSTEM_SLEEP_PM_OPS()
uses.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Dave Airlie <airlied@redhat.com>

Regular nightly randconfig build testing discovered these warnings:

drivers/gpu/drm/cirrus/cirrus_drv.c:79:12: warning: 'cirrus_pm_suspend' defined but not used [-Wunused-function]
drivers/gpu/drm/cirrus/cirrus_drv.c:96:12: warning: 'cirrus_pm_resume' defined but not used [-Wunused-function]

Fix these by adding the same condition that SET_SYSTEM_SLEEP_PM_OPS()
uses.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/shmobile/shmob_drm_drv.c:300:5: warning: "CONFIG_PM_SLEEP" is not defined [-Wundef]

Always use #ifdef with CONFIG symbols, never just bare #if

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/rcar-du/rcar_du_drv.c:190:5: warning: "CONFIG_PM_SLEEP" is not defined [-Wundef]

Always use #ifdef with CONFIG symbols, never just bare #if

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Dave Airlie <airlied@redhat.com>

In tda998x_encoder_destroy(), priv->cec is never NULL, so,
remove its test.

Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
Signed-off-by: Dave Airlie <airlied@redhat.com>

Merge branch 'drm-i915-mst-support-next' of git://people.freedesktop.org/~airlied/linux into drm-next

Evil super powers maintainer abuse, get i915 mst support into -next.

* 'drm-i915-mst-support-next' of git://people.freedesktop.org/~airlied/linux:
  drm/i915: mst topology dumper in debugfs (v0.2)
  drm/i915: add DP 1.2 MST support (v0.7)
  drm/i915: split conversion function out into separate function
  drm/i915: check connector->encoder before using it.
  i915: split some DP modesetting code into a separate function
  drm/i915: add some registers need for displayport MST support.

use the mst helper code to dump the topology in debugfs.

v0.2: drop is_mst check - as we want to dump other info

Reviewed-by: Todd Previte <tprevite@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

This adds DP 1.2 MST support on Haswell systems.

Notes:
a) this reworks irq handling for DP MST ports, so that we can
avoid the mode config locking in the current hpd handlers, as
we need to process up/down msgs at a better time.

Changes since v0.1:
use PORT_PCH_HOTPLUG to detect short vs long pulses
add a workqueue to deal with digital events as they can get blocked on the
main workqueue beyong mode_config mutex
fix a bunch of modeset checker warnings
acks irqs in the driver
cleanup the MST encoders

Changes since v0.2:
check irq status again in work handler
move around bring up and tear down to fix DPMS on/off
use path properties.

Changes since v0.3:
updates for mst apis
more state checker fixes
irq handling improvements
fbcon handling support
improved reference counting of link - fixes redocking.

Changes since v0.4:
handle gpu reset hpd reinit without oopsing
check link status on HPD irqs
fix suspend/resume

Changes since v0.5:
use proper functions to get max link/lane counts
fix another checker backtrace - due to connectors disappearing.
set output type in more places fro, unknown->displayport
don't talk to devices if no HPD asserted
check mst on short irqs only
check link status properly
rebase onto prepping irq changes.
drop unsued force_act

Changes since v0.6:
cleanup unused struct entry.

[airlied: fix some sparse warnings].

Reviewed-by: Todd Previte <tprevite@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

sparse complains about these functions missing a prototype, but looking
closer they aren't (and likely not supposed to be) used outside of this
source file, so they can be made static.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

The final parameter to ttm_bo_reserve() is a pointer, therefore callers
should use NULL instead of 0.

Fixes a bunch of sparse warnings of this type:

	warning: Using plain integer as NULL pointer

Signed-off-by: Thierry Reding <treding@nvidia.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

The drm_copy_field() function copies strings into userspace buffers, so
the first parameter needs to have a __user annotation to avoid warnings
from the sparse checker.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

for MST I need to reuse this, so just move it now.

Signed-off-by: Dave Airlie <airlied@redhat.com>

DP MST will need connectors that aren't connected to specific
encoders, add some checks in advance to avoid oopses.

Reviewed-by: Todd Previte <tprevite@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

this is just prep work for mst support.

Reviewed-by: Todd Previte <tprevite@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

These are just from the Haswell spec.

Reviewed-by: Todd Previte <tprevite@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

Makes the code a bit more readable.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Sachin Kamat <sachin.kamat@samsung.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

Not enough brown paper bags, you'll have to share one.
(oops below).

The initial match condition code was racy (locking is coming I hear).

then along came:
cd234b0b
drm/i915: Do not dereference NULL crtc or fb until after checking

Chris made an attempt to fix it, Ben "reviewed" it.
Daniel merged it.

Then
drm/i915: Make use of intel_fb_obj() (v2)
2ff8fde1



made it worse by removing the obj check later.

All in all, my laptop can't barely turn off the display
without hitting this.

Posted to #intel-gfx out of niceness, but I've merged
this already into drm-next.

Here's an oops.
[   11.528185] BUG: unable to handle kernel NULL pointer dereference at 00000000000000d0
[   11.528233] IP: [<ffffffffa0161fde>] intel_edp_psr_match_conditions+0x1e/0x2e0 [i915]
[   11.528294] PGD 35bc0067 PUD c997c067 PMD 0
[   11.528321] Oops: 0000 [#1] SMP
[   11.528916] CPU: 3 PID: 244 Comm: kworker/3:2 Not tainted 3.16.0-rc4+ #17
[   11.528949] Hardware name: LENOVO 20ARS25701/20ARS25701, BIOS GJET72WW (2.22 ) 02/21/2014
[   11.529004] Workqueue: events intel_edp_psr_work [i915]
[   11.529031] task: ffff8803079fdaa0 ti: ffff8803079c4000 task.ti: ffff8803079c4000
[   11.529067] RIP: 0010:[<ffffffffa0161fde>]  [<ffffffffa0161fde>] intel_edp_psr_match_conditions+0x1e/0x2e0 [i915]
[   11.529129] RSP: 0018:ffff8803079c7d40  EFLAGS: 00010246
[   11.529155] RAX: 0000000000000000 RBX: ffff88030c11c000 RCX: c000000000000000
[   11.529189] RDX: 0000000000000001 RSI: 1df0000000000000 RDI: ffff88030c1190d8
[   11.529222] RBP: ffff8803079c7d60 R08: ffffffff82691140 R09: 0000000000000000
[   11.529256] R10: ffff8803079fdaa0 R11: 3e00000000000000 R12: ffff88030c11c728
[   11.529290] R13: ffff88030c1190d8 R14: ffff88031e2d8e00 R15: 00000000000000c0
[   11.529324] FS:  0000000000000000(0000) GS:ffff88031e2c0000(0000) knlGS:0000000000000000
[   11.529361] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   11.529389] CR2: 00000000000000d0 CR3: 00000000c8d9d000 CR4: 00000000001407e0
[   11.529423] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   11.529457] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   11.529489] Stack:
[   11.529500]  ffff88030c119000 ffff88030c11c728 ffff88030c1190d8 ffff88031e2d8e00
[   11.529541]  ffff8803079c7d88 ffffffffa01679b2 ffff880035b29a80 ffff880307909f00
[   11.529583]  ffff88031e2d4740 ffff8803079c7df8 ffffffff810a78ab ffffffff810a7849
[   11.529624] Call Trace:
[   11.529654]  [<ffffffffa01679b2>] intel_edp_psr_work+0x52/0x90 [i915]
[   11.529689]  [<ffffffff810a78ab>] process_one_work+0x1db/0x540
[   11.529719]  [<ffffffff810a7849>] ? process_one_work+0x179/0x540
[   11.529750]  [<ffffffff810a81ed>] worker_thread+0x11d/0x520
[   11.529779]  [<ffffffff810a80d0>] ? create_and_start_worker+0x60/0x60
[   11.529810]  [<ffffffff810aeb04>] kthread+0xe4/0x100
[   11.529836]  [<ffffffff810aea20>] ? kthread_create_on_node+0x200/0x200
[   11.529870]  [<ffffffff81705ebc>] ret_from_fork+0x7c/0xb0
[   11.529896]  [<ffffffff810aea20>] ? kthread_create_on_node+0x200/0x200
[   11.529926] Code: ba 31 13 f0 c9 85 f6 75 84 eb d0 66 90 0f 1f 44 00 00 55 48 89 e5 41 56 41 55 41 54 53 48 8b 87 68 ff ff ff 48 8b 9f 28 ff ff ff <48> 8b 80 d0 00 00 00 4c 8b 63 28 48 8b 40 48 48 85 c0 0f 84 1a
[   11.530110] RIP  [<ffffffffa0161fde>] intel_edp_psr_match_conditions+0x1e/0x2e0 [i915]
[   11.530163]  RSP <ffff8803079c7d40>
[   11.530180] CR2: 00000000000000d0

Signed-off-by: Dave Airlie <airlied@redhat.com>

misc core patches.

* tag 'topic/core-stuff-2014-07-18' of git://anongit.freedesktop.org/drm-intel:
  drm: Check for connection_mutex in drm_select_eld
  drm/dp-mst-helper: Don't use uninitialized fields of the sideband message header
  drm/dp-mst-helper: Avoid reading uninitialized value
  drm/plane-helper: Use proper plane init function
  drivers/gpu/drm/drm_buffer.c: remove unnecessary null test before kfree
  drm: Fix function names in kerneldoc