Well, mostly drm_file.h, and clean up all related things:

- I didnt' figure out the difference between preclose and postclose.
  The existing explanation in drm-internals.rst didn't convince me,
  since it's also really outdated - we clean up pending DRM events in
  the core nowadays. I put a FIXME in for the future.

- Another FIXME is to have a macro for default fops.

- Lots of links all around, main areas are to tie the overview in
  drm_file.c more into the callbacks in struct drm_device, and the
  other is to link render/primary node code to the right sections in
  drm-uapi.rst.

- Also moved the open/close stuff to drm_drv.h from drm-internals.rst,
  seems like the better place for that information. Since that section
  was rather outdated this amounted to full-on rewrite.

A big missing piece here is some overview graph, but I think better to
wait with that one until drm_device and drm_driver are also fully
documented.

v2: Nits from Sean.
Reviewed-by: NSean Paul <seanpaul@chromium.org>
Reviewed-by: NLiviu Dudau <Liviu.Dudau@arm.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170308141257.12119-12-daniel.vetter@ffwll.ch

We might as well dump the drm_file pointer, that's about as useful
a cookie as the pid. Noticed while typing docs for drm_file and friends.

Since the only consumer of this is the tracepoints I think we can safely
change this - those tracepoints should not be uapi relevant at all. It
all goes back to

commit b9c2c9ae
Author: Jesse Barnes <jbarnes@virtuousgeek.org>
Date:   Thu Jul 1 16:48:09 2010 -0700

    drm: add per-event vblank event trace points

which doesn't give a special justification for using pid over a pointer.

Also note that the nouveau code setting it is entirely pointless:
Since this isn't a vblank event, it will never hit the vblank
tracepoints.

Cc: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: NSean Paul <seanpaul@chromium.org>
Reviewed-by: NLiviu Dudau <Liviu.Dudau@arm.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20170308141257.12119-11-daniel.vetter@ffwll.ch

My static checker complains that "release" is uninitialized if
qxl_alloc_release_reserved() fails, so let's add a check for that.
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170314075410.GB5984@mwandaSigned-off-by: NGerd Hoffmann <kraxel@redhat.com>

kmem_cache_alloc returns NULL on error, not ERR_PTR.

Fixes: f5985bf9Reported-by: NJiri Slaby <jslaby@suse.cz>
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
Reviewed-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1489393346-13874-1-git-send-email-kraxel@redhat.com

drivers/gpu/drm/tinydrm/mipi-dbi.c:657:2-3: Unneeded semicolon
drivers/gpu/drm/tinydrm/mipi-dbi.c:593:2-3: Unneeded semicolon

 Remove unneeded semicolon.

Generated by: scripts/coccinelle/misc/semicolon.cocci
Signed-off-by: NFengguang Wu <fengguang.wu@intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20170312144636.GA91808@lkp-g5.lkp.intel.com

In order to analyze some video config failed, add some useful
printouts.
Signed-off-by: NChris Zhong <zyw@rock-chips.com>
Signed-off-by: NSean Paul <seanpaul@chromium.org>
Link: http://patchwork.freedesktop.org/patch/msgid/1488940077-22297-4-git-send-email-zyw@rock-chips.com

Correct some DP register address for PHY Configuration according to
latest datasheet.
Signed-off-by: NChris Zhong <zyw@rock-chips.com>
Signed-off-by: NSean Paul <seanpaul@chromium.org>
Link: http://patchwork.freedesktop.org/patch/msgid/1488940077-22297-3-git-send-email-zyw@rock-chips.com

The clk_get_rate return 0 if something goes wrong, so it can never be
less then zero, the ret should be set a error code, otherwise the
cdn_dp_clk_enable will return 0 when it failed at clk_get_rate.
In addition, clk_get_rate() returns an "unsigned long", so use
"unsigned long" instead of "u32" is better.
Signed-off-by: NChris Zhong <zyw@rock-chips.com>
Signed-off-by: NSean Paul <seanpaul@chromium.org>
Link: http://patchwork.freedesktop.org/patch/msgid/1488940077-22297-2-git-send-email-zyw@rock-chips.com

Merge Laurent's drm_platform removal code. Only conflict is with the
drm_pci.h extraction, which allows me to fix up the misplayed
drm_platform_init fumble that 0day and Stephen Rothwell reported.
Signed-off-by: NDaniel Vetter <daniel.vetter@intel.com>

The driver is already made of 5 separate source files. Move it to a
newly created directory named synopsys where more Synopsys bridge
drivers can be added later (for the DisplayPort controller for
instance).
Suggested-by: NJose Abreu <Jose.Abreu@synopsys.com>
Signed-off-by: NLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: NJose Abreu <joabreu@synopsys.com>
Signed-off-by: NArchit Taneja <architt@codeaurora.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20170303172007.26541-10-laurent.pinchart+renesas@ideasonboard.com

The Synopsys Designware HDMI TX Controller does not enforce register
access on platforms instanciating it. The current driver supports two
different types of memory-mapped flat register access, but in order to
support the Amlogic Meson SoCs integration, and provide a more generic
way to handle all sorts of register mapping, switch the register access
to use the regmap infrastructure.

In the case of registers that are not flat memory-mapped or do not
conform to the current driver implementation, a regmap struct can be
given in the plat_data and be used at probe or bind.

Since the AHB audio driver is only available with direct memory access,
only allow the I2S audio driver to be registered is directly
memory-mapped.
Signed-off-by: NNeil Armstrong <narmstrong@baylibre.com>
Reviewed-by: NLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Tested-by: NLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Tested-by: NNeil Armstrong <narmstrong@baylibre.com>
Reviewed-by: NJose Abreu <Jose.Abreu@synopsys.com>
Signed-off-by: NArchit Taneja <architt@codeaurora.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20170303172007.26541-10-laurent.pinchart+renesas@ideasonboard.com

The device type isn't used anymore now that workarounds and PHY-specific
operations are performed based on version information read at runtime.
Remove it.
Signed-off-by: NKieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Signed-off-by: NLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Tested-by: NNeil Armstrong <narmstrong@baylibre.com>
Reviewed-by: NJose Abreu <joabreu@synopsys.com>
Signed-off-by: NArchit Taneja <architt@codeaurora.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20170303172007.26541-9-laurent.pinchart+renesas@ideasonboard.com

The DWC HDMI TX controller interfaces with a companion PHY. While
Synopsys provides multiple standard PHYs, SoC vendors can also integrate
a custom PHY.

Modularize PHY configuration to support vendor PHYs through platform
data. The existing PHY configuration code was originally written to
support the DWC HDMI 3D TX PHY, and seems to be compatible with the DWC
MLP PHY. The HDMI 2.0 PHY will require a separate configuration
function.
Signed-off-by: NKieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Signed-off-by: NLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Tested-by: NNeil Armstrong <narmstrong@baylibre.com>
Reviewed-by: NJose Abreu <Jose.Abreu@synopsys.com>
Signed-off-by: NArchit Taneja <architt@codeaurora.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20170303172007.26541-8-laurent.pinchart+renesas@ideasonboard.com

The HDMI TX controller support different PHYs whose programming
interface can vary significantly, especially with vendor PHYs that are
not provided by Synopsys. To support them, create a PHY operation
structure that can be provided by the platform glue layer. The existing
PHY handling code (limited to Synopsys PHY support) is refactored into a
set of default PHY operations that are used automatically when the
platform glue doesn't provide its own operations.
Signed-off-by: NLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Tested-by: NNeil Armstrong <narmstrong@baylibre.com>
Reviewed-by: NJose Abreu <joabreu@synopsys.com>
Signed-off-by: NArchit Taneja <architt@codeaurora.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20170305233615.11993-1-laurent.pinchart+renesas@ideasonboard.com

When powering the PHY up we need to wait for the PLL to lock. This is
done by polling the TX_PHY_LOCK bit in the HDMI_PHY_STAT0 register
(interrupt-based wait could be implemented as well but is likely
overkill). The bit is asserted when the PLL locks, but the current code
incorrectly waits for the bit to be deasserted. Fix it, and while at it,
replace the udelay() with a sleep as the code never runs in
non-sleepable context.

To be consistent with the power down implementation move the poll loop
to the power off function.
Signed-off-by: NLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Tested-by: NNeil Armstrong <narmstrong@baylibre.com>
Reviewed-by: NJose Abreu <joabreu@synopsys.com>
Signed-off-by: NArchit Taneja <architt@codeaurora.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20170305233557.11945-1-laurent.pinchart+renesas@ideasonboard.com

The PHY requires us to wait for the PHY to switch to low power mode
after deasserting TXPWRON and before asserting PDDQ in the power down
sequence, otherwise power down will fail.

The PHY power down can be monitored though the TX_READY bit, available
through I2C in the PHY registers, or the TX_PHY_LOCK bit, available
through the HDMI TX registers. As the two are equivalent, let's pick the
easier solution of polling the TX_PHY_LOCK bit.

The power down code is currently duplicated in multiple places. To avoid
spreading multiple calls to a TX_PHY_LOCK poll function, we have to
refactor the power down code and group it all in a single function.

Tests showed that one poll iteration was enough for TX_PHY_LOCK to
become low, without requiring any additional delay. Retrying the read
five times with a 1ms to 2ms delay between each attempt should thus be
more than enough.
Signed-off-by: NLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Tested-by: NNeil Armstrong <narmstrong@baylibre.com>
Reviewed-by: NJose Abreu <joabreu@synopsys.com>
Signed-off-by: NArchit Taneja <architt@codeaurora.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20170305233539.11898-1-laurent.pinchart+renesas@ideasonboard.com

If the input pixel format is not RGB, the CSC must be enabled in order to
provide valid pixel to DVI sinks.
This patch removes the hdmi only dependency on the CSC enabling.
Reviewed-by: NJose Abreu <joabreu@synopsys.com>
Reviewed-by: NLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: NNeil Armstrong <narmstrong@baylibre.com>
Tested-by: NNeil Armstrong <narmstrong@baylibre.com>
Signed-off-by: NArchit Taneja <architt@codeaurora.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20170303172007.26541-4-laurent.pinchart+renesas@ideasonboard.com

The color space converter isn't part of the PHY, move its configuration
out of PHY code.
Signed-off-by: NLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Tested-by: NNeil Armstrong <narmstrong@baylibre.com>
Reviewed-by: NJose Abreu <joabreu@synopsys.com>
Signed-off-by: NArchit Taneja <architt@codeaurora.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20170303172007.26541-3-laurent.pinchart+renesas@ideasonboard.com

Most of the hdmi_phy_test_*() functions are unused. Remove them.
Signed-off-by: NLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Tested-by: NNeil Armstrong <narmstrong@baylibre.com>
Reviewed-by: NJose Abreu <joabreu@synopsys.com>
Tested-by: NNickey Yang <nickey.yang@rock-chips.com>
Signed-off-by: NArchit Taneja <architt@codeaurora.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20170303172007.26541-2-laurent.pinchart+renesas@ideasonboard.com

I'm torn on whether drm_minor really should be here or somewhere else.
Maybe with more clarity after untangling drmP.h more this is easier to
decide, for now I've put a FIXME comment right next to it. Right now
we need struct drm_minor for the inline drm_file type helpers, and so
it does kinda make sense to have them here.

Next patch will kerneldoc-ify the entire pile.
Reviewed-by: NGustavo Padovan <gustavo.padovan@collabora.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170308141257.12119-10-daniel.vetter@ffwll.ch

This was originally added by David Herrmann for range checks, but
entirely unused. It confused me, so let's remove it.

Cc: David Herrmann <dh.herrmann@gmail.com>
Reviewed-by: NDavid Herrmann <dh.herrmann@gmail.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170308141257.12119-9-daniel.vetter@ffwll.ch

It's not just file ops, but drm_file stuff in general. This is prep
work to extracting a drm_file.h header in the next patch.
Reviewed-by: NGustavo Padovan <gustavo.padovan@collabora.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170308141257.12119-8-daniel.vetter@ffwll.ch

Worst case if the hw can't support completion signalling in a
race-free way we want the event to be too late, not too early.

Text adapted from a proposal from Laurent - the other side of how to
make hw work correctly where it's possible is imo already sufficiently
documented.

v2: Review from Laurent.

Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: NLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170308141257.12119-7-daniel.vetter@ffwll.ch

An easy one as a drive-by.
Reviewed-by: NGustavo Padovan <gustavo.padovan@collabora.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170308141257.12119-6-daniel.vetter@ffwll.ch

Just another step in finally making drmP.h obsolete.
Reviewed-by: NGustavo Padovan <gustavo.padovan@collabora.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170308141257.12119-5-daniel.vetter@ffwll.ch

And remove the semi-kernel-doc stuff, to make sure no one uses this.
Reviewed-by: NGustavo Padovan <gustavo.padovan@collabora.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170308141257.12119-4-daniel.vetter@ffwll.ch

Plus a little bit more documentation.

v2: Untangle the missing forward decls to make drm_prime|gem.h
free-standing.
Reviewed-by: NGustavo Padovan <gustavo.padovan@collabora.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170308141257.12119-3-daniel.vetter@ffwll.ch

At least radeon, amdgpu and nouveau should be converted. We have
patches for i915 already.

v2: Spelling (Sean).
Reviewed-by: NSean Paul <seanpaul@chromium.org>
Signed-off-by: NDaniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170308141257.12119-2-daniel.vetter@ffwll.ch

drm_debugfs_cleanup() now removes all minor->debugfs_list entries
automatically, so it's not necessary to call drm_debugfs_remove_files().

Cc: airlied@linux.ie
Cc: kraxel@redhat.com
Signed-off-by: NNoralf Trønnes <noralf@tronnes.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20170307204924.1002-4-noralf@tronnes.org

[ kraxel: solved conflict ]
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>

Remove the .debugfs_cleanup() callback now that all the users are gone.
Signed-off-by: NNoralf Trønnes <noralf@tronnes.org>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20170307204924.1002-3-noralf@tronnes.org

Move the contents of msm_debugfs_cleanup() to msm_drm_uninit() to free
up the drm_driver->debugfs_cleanup callback. Also remove the
mdp_kms_funcs->debugfs_cleanup callback which has no users.

Cc: robdclark@gmail.com
Signed-off-by: NNoralf Trønnes <noralf@tronnes.org>
Acked-by: NRob Clark <robdclark@gmail.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20170307204924.1002-2-noralf@tronnes.org

Gabriel Krisman reported these warnings when building the documentation:

 ./drivers/gpu/drm/drm_dp_helper.c:1165: warning: No description found
for parameter 'crtc'
./drivers/gpu/drm/drm_dp_helper.c:1166: warning: No description found
for parameter 'crtc'
Reported-by: NGabriel Krisman Bertazi <krisman@collabora.co.uk>
Signed-off-by: NTomeu Vizoso <tomeu.vizoso@collabora.com>
Signed-off-by: NSean Paul <seanpaul@chromium.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20170307203511.14258-1-tomeu.vizoso@collabora.com

Just use kmem_cache instead of rolling
our own, limited implementation.
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
Reviewed-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1488377348-5006-1-git-send-email-kraxel@redhat.com

Call qxl_add_monitors_config_modes() unconditionally.  Do all sanity
checks in that function.

Fix sanity checks.  monitors_config is the current monitor
configuration, whereas client_monitors_config is the configuration
requested by the spice client.  So when filling the mode list, based on
the spice client request, we need to look at
client_monitors_config->count not monitors_config->count.
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
Reviewed-by: NGabriel Krisman Bertazi <krisman@collabora.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/1488363154-6889-5-git-send-email-kraxel@redhat.com

Try to read the client monitors config at driver load time, even without
explicit notification.  So in case that info was filled before the driver
loaded and we've missed the notifications because of that the settings
will still be used.

With that place we now have to take care to properly handle a empty client
monitors config, so we don't trip over an uninitialized client monitors
config.
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
Reviewed-by: NGabriel Krisman Bertazi <krisman@collabora.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/1488363154-6889-4-git-send-email-kraxel@redhat.com

When reading the monitor config fails, don't retry forever.  If it fails
ten times in a row just give up to avoid the driver hangs.  Also add a
small delay after each attempt, so the host has a chance to complete a
partial update.
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
Reviewed-by: NGabriel Krisman Bertazi <krisman@collabora.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/1488363154-6889-3-git-send-email-kraxel@redhat.com

very old qxl hardware revisions (predating qxl ksm support by a few
years) supported a fixed list of video modes only.  The list is still
provided by the virtual hardware, for backward compatibility reasons.

The qxl kms driver never ever looks at it, except for dumping it to
the kernel log at load time in case debug logging is enabled.  Drop
that pointless code.
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
Reviewed-by: NGabriel Krisman Bertazi <krisman@collabora.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/1488363154-6889-2-git-send-email-kraxel@redhat.com

If fbdev emulation is disabled, the QXL shutdown path will try to clean
a framebuffer that wasn't initialized, hitting the Oops below.  The
problem is that even when FBDEV_EMULATION is disabled we allocate the
qfbdev strutucture, but we don't initialize it.  The fix is to stop
allocating the memory, since it won't be used.  This allows the existing
verification in the cleanup hook to do it's job preventing the oops.

Now that we don't allocate the unused fbdev structure, we need to be
careful when dereferencing it in the PM suspend hook.

[   24.284684] BUG: unable to handle kernel NULL pointer dereference at 00000000000002e0
[   24.285627] IP: mutex_lock+0x18/0x30
[   24.286049] PGD 78cdf067
[   24.286050] PUD 7940f067
[   24.286344] PMD 0
[   24.286649]
[   24.287072] Oops: 0002 [#1] SMP
[   24.287422] Modules linked in: qxl
[   24.287806] CPU: 0 PID: 2328 Comm: bash Not tainted 4.10.0-rc5+ #97
[   24.288515] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.3-20161025_171302-gandalf 04/01/2014
[   24.289681] task: ffff88007c4c0000 task.stack: ffffc90001b58000
[   24.290354] RIP: 0010:mutex_lock+0x18/0x30
[   24.290812] RSP: 0018:ffffc90001b5bcb0 EFLAGS: 00010246
[   24.291401] RAX: 0000000000000000 RBX: 00000000000002e0 RCX: 0000000000000000
[   24.292209] RDX: ffff88007c4c0000 RSI: 0000000000000001 RDI: 00000000000002e0
[   24.292987] RBP: ffffc90001b5bcb8 R08: fffffffffffffffe R09: 0000000000000001
[   24.293797] R10: ffff880078d80b80 R11: 0000000000011400 R12: 0000000000000000
[   24.294601] R13: 00000000000002e0 R14: ffffffffa0009c28 R15: 0000000000000060
[   24.295439] FS:  00007f30e3acbb40(0000) GS:ffff88007fc00000(0000) knlGS:0000000000000000
[   24.296364] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   24.296997] CR2: 00000000000002e0 CR3: 0000000078c7b000 CR4: 00000000000006f0
[   24.297813] Call Trace:
[   24.298097]  drm_framebuffer_cleanup+0x1f/0x70
[   24.298612]  qxl_fbdev_fini+0x68/0x90 [qxl]
[   24.299074]  qxl_modeset_fini+0xd/0x30 [qxl]
[   24.299562]  qxl_pci_remove+0x22/0x50 [qxl]
[   24.300025]  pci_device_remove+0x34/0xb0
[   24.300507]  device_release_driver_internal+0x150/0x200
[   24.301082]  device_release_driver+0xd/0x10
[   24.301587]  unbind_store+0x108/0x150
[   24.301993]  drv_attr_store+0x20/0x30
[   24.302402]  sysfs_kf_write+0x32/0x40
[   24.302827]  kernfs_fop_write+0x108/0x190
[   24.303269]  __vfs_write+0x23/0x120
[   24.303678]  ? security_file_permission+0x36/0xb0
[   24.304193]  ? rw_verify_area+0x49/0xb0
[   24.304636]  vfs_write+0xb0/0x190
[   24.305004]  SyS_write+0x41/0xa0
[   24.305362]  entry_SYSCALL_64_fastpath+0x1a/0xa9
[   24.305887] RIP: 0033:0x7f30e31d9620
[   24.306285] RSP: 002b:00007ffc54b47e68 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[   24.307128] RAX: ffffffffffffffda RBX: 00007f30e3497600 RCX: 00007f30e31d9620
[   24.307928] RDX: 000000000000000d RSI: 0000000000da2008 RDI: 0000000000000001
[   24.308727] RBP: 000000000070bc60 R08: 00007f30e3498760 R09: 00007f30e3acbb40
[   24.309504] R10: 0000000000000073 R11: 0000000000000246 R12: 0000000000000001
[   24.310295] R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffc54b47f34
[   24.311095] Code: 0e 01 e9 7b fe ff ff 66 90 66 2e 0f 1f 84 00 00 00 00 00
55 48 89 e5 53 48 89 fb e8 83 e8 ff ff 65 48 8b 14 25 40 c4 00 00 31 c0 <3e>
48 0f b1 13 48 85 c0 74 08 48 89 df e8 66 fd ff ff 5b 5d c3
[   24.313182] RIP: mutex_lock+0x18/0x30 RSP: ffffc90001b5bcb0
[   24.313811] CR2: 00000000000002e0
[   24.314208] ---[ end trace 29669c1593cae14b ]---
Signed-off-by: NGabriel Krisman Bertazi <krisman@collabora.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/20170227203330.18542-1-krisman@collabora.co.ukSigned-off-by: NGerd Hoffmann <kraxel@redhat.com>

Fixes the following link error when CONFIG_DRM_ANALOGIX_DP is not defined:

ERROR: "analogix_dp_start_crc" [drivers/gpu/drm/rockchip/rockchipdrm.ko] undefined!
ERROR: "analogix_dp_stop_crc" [drivers/gpu/drm/rockchip/rockchipdrm.ko] undefined!

Fixes: 3190e58d ("drm/rockchip: Implement CRC debugfs API")
Cc: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Cc: Mark Yao <mark.yao@rock-chips.com>
Cc: Sean Paul <seanpaul@chromium.org>
Cc: Heiko Stuebner <heiko@sntech.de>
Cc: dri-devel@lists.freedesktop.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-rockchip@lists.infradead.org
Cc: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: NEmil Velikov <emil.l.velikov@gmail.com>
Signed-off-by: NSean Paul <seanpaul@chromium.org>

This patch fixes the following compilation error when CONFIG_DEBUG_FS is not defined.

../drivers/gpu/drm/drm_dp_helper.c: In function ‘drm_dp_aux_crc_work’:
../drivers/gpu/drm/drm_dp_helper.c:1029:13: error: ‘struct drm_crtc’ has no member named ‘crc’
../drivers/gpu/drm/drm_dp_helper.c:1031:12: error: ‘struct drm_crtc’ has no member named ‘crc’
  make[4]: *** [drivers/gpu/drm/drm_dp_helper.o] Error 1
  make[4]: *** Waiting for unfinished jobs....

Fixes: 79c1da7c ("drm/dp: add helpers for capture of frame CRCs")
Cc: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Cc: Sean Paul <seanpaul@chromium.org>
Cc: Daniel Vetter <daniel.vetter@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: David Airlie <airlied@linux.ie>
Cc: dri-devel@lists.freedesktop.org
Reviewed-by: NEmil Velikov <emil.l.velikov@gmail.com>
Signed-off-by: NSean Paul <seanpaul@chromium.org>