Use drm_atomic_helper_resume/suspend() and get rid off all the obsolete
register level context restoring code.
Signed-off-by: NJyri Sarha <jsarha@ti.com>

Enable and disable interrupts in crtc start() and stop(). None of the
interrupts can fire if CRTC is disabled, so it is cleaner - when
considering suspend/resume code etc. - to enable the interrupts when
CRTC is turned on and to disable them when CRTC is turned off.
Signed-off-by: NJyri Sarha <jsarha@ti.com>

Add atomic modeset helpers to tfp410 connector funcs. Property handling
related helpers, atomic reset helper, and new dpms helper is needed in
connector for atomic modeseting to work. The default helper functions
are enough.
Signed-off-by: NJyri Sarha <jsarha@ti.com>

Set crtc panel info at init phase. Setting it at prepare callback does
it multiple times for no good reason and it is also too late when atomic
modeset is used.
Signed-off-by: NJyri Sarha <jsarha@ti.com>

Add atomic modeset helpers to panel connector funcs. Property handling
related helpers, atomic reset helper, and new dpms helper is needed in
connector for atomic modeseting to work. The default helper functions
are enough.
Signed-off-by: NJyri Sarha <jsarha@ti.com>

Set crtc panel info at init phase. Setting it at prepare callback does
it multiple times for no good reason and it is also too late when atomic
modeset is used.
Signed-off-by: NJyri Sarha <jsarha@ti.com>

Remove tilcdc_verify_fb(). The tilcdc_verify_fb() function is not
needed because the same checks are implemented in
tilcdc_plane_atomic_check().
Signed-off-by: NJyri Sarha <jsarha@ti.com>

Remove obsolete crtc helper functions. These are not needed when
atomic modeset is used.

Note that the drm_crtc_helper_funcs mode_fixup() is still needed. The
crtc's check() callback can not do its job here.

The plane's check() callback needs to set drm_crtc_state's
->mode_changed to true if the pixel format for the framebuffer
changes. Because of this drm_mode_config_funcs atomic_check() callback
needs to call drm_atomic_helper_check_modeset() once more after it has
called drm_atomic_helper_check_planes(). If the fixing of the
adjusted_mode would be done in drm_crtc_helper_funcs atomic_check()
callback, it would get over written by the extra
drm_atomic_helper_check_modeset() call.
Signed-off-by: NJyri Sarha <jsarha@ti.com>

Set DRIVER_ATOMIC and use atomic helpers and rename commit and prepare
crtc helpers to enable and disable. This makes the final jump to mode
setting, but there is lot of obsolete code to clean up.
Signed-off-by: NJyri Sarha <jsarha@ti.com>

Add drm_mode_config_reset() call to tilcdc_load(). This is need to
initialize atomic state variables at load time.
Signed-off-by: NJyri Sarha <jsarha@ti.com>

Add atomic mode config funcs. The atomic_commit implementation is a
copy-paste from drm_atomic_helper_commit(), leaving out the async
test. The similar copy-paste implementation appears to be used in many
other drivers too. The standard drm_atomic_helper_check() is used for
checking.

The drm_atomic_helper_check() can not be used in drm_mode_config_funcs
atomic_check() callback because the plane's check implementation may
update crtc state's ->mode_changed flag. Because of this the
drm_atomic_helper_check_modeset() has to be called once more after
drm_atomic_helper_check_planes() (see drm_atomic_helper_check_modeset()
documentation).
Signed-off-by: NJyri Sarha <jsarha@ti.com>

Add tilcdc_crtc_atomic_check(). Checks the display mode validity and
the presence of the mandatory primary plane.

The drm_crtc_helper_funcs mode_fixup() callback is left untouched and
the check function does no try to do its job on purpose, despite what
the mode_fixup() callback's documentations suggests.

The plane's check() callback needs to set drm_crtc_state's
->mode_changed to true if the pixel format for the framebuffer
changes. Because of this drm_mode_config_funcs atomic_check() callback
needs to call drm_atomic_helper_check_modeset() once more after it has
called drm_atomic_helper_check_planes(). If the fixing of the
adjusted_mode would be done in drm_crtc_helper_funcs atomic_check()
callback, it would get over written by the extra
drm_atomic_helper_check_modeset() call.
Signed-off-by: NJyri Sarha <jsarha@ti.com>

Add tilcdc_crtc_mode_set_nofb(). The mode_set_nofb() semantics do not
fit well to LCDC, because of the mandatory framebuffer. However, when
the primary plane is required in the check phase, it and the
framebuffer can be found from the atomic state struct.
Signed-off-by: NJyri Sarha <jsarha@ti.com>

Initialize dummy primary plane from crtc init.
Signed-off-by: NJyri Sarha <jsarha@ti.com>

Add dummy primary plane implementation. LCDC does not really have
planes, only simple framebuffer that is mandatory. This primary plane
implementation has the necessary checks for implementing simple
framebuffer trough DRM plane abstraction. For setting the actual
framebuffer the implementation relies on a CRTC side function.
Signed-off-by: NJyri Sarha <jsarha@ti.com>

Make tilcdc_crtc_page_flip() work if crtc is not yet on. The plane
commit sometimes comes before crtc is turned on. The new framebuffer
should be set to scanout also in that case, so that it is there when
crtc is turned on at the end of the commit phase.
Signed-off-by: NJyri Sarha <jsarha@ti.com>

Make tilcdc_crtc_page_flip() public for dummy plane implementation to use.
Signed-off-by: NJyri Sarha <jsarha@ti.com>

Fix tilcdc component master unloading. If a subcomponent module
(tda998x in this case) is unloaded before its master (tilcdc in this
case), it calls drm_put_dev() and it should not be called again by
the master when its module is unloaded. However component_master_del()
must still be called and the check if the drm_put_dev() has been
called must be in component_master_ops unbind() callback, not in
platform_driver remove() callback.
Signed-off-by: NJyri Sarha <jsarha@ti.com>

Avoid error print by of_graph_get_next_endpoint() if there is no ports
present.
Signed-off-by: NJyri Sarha <jsarha@ti.com>

Add drm_crtc_vblank_on() and *_off() calls to start() and stop()
functions, to make sure any vblank waits etc. gets properly cleaned
up.
Signed-off-by: NJyri Sarha <jsarha@ti.com>

Increase time out for waiting frame done interrupt. 50ms is long
enough for the usual display modes (50 Hz or higher refresh rate), but
it may be a bit tight for some unusual mode.
Signed-off-by: NJyri Sarha <jsarha@ti.com>

Move wait queue waiting of LCDC_FRAME_DONE IRQ from tilcdc_crtc_dpms()
into stop() function. This is just a cleanup and enables independent
use of stop() function.
Signed-off-by: NJyri Sarha <jsarha@ti.com>

Reorder the IRQ function so that the write to LCDC_END_OF_INT_IND_REG
is done last. The write to LCDC_END_OF_INT_IND_REG indicates to LCDC
that the interrupt service routine has completed (see section
13.3.6.1.6 in AM335x TRM). This is needed if LCDC's ipgvmodirq module
is configured for pulse interrupts.
Signed-off-by: NJyri Sarha <jsarha@ti.com>

Move LCDC_SYNC_LOST handling inside if (ver == 2) statement.
LCDC_SYNC_LOST interrupt status bit is only defined for version 2
silicon.
Signed-off-by: NJyri Sarha <jsarha@ti.com>

Restore old dpms state in pm_resume(). The dpms is turned off in
pm_suspend() and it should be restored to its original state in
pm_resume(). Without this patch the display is left blanked after a
suspend/resume cycle.

Fixes commit 614b3cfe ("drm/tilcdc: disable the lcd controller/dma
engine when suspend invoked")
Signed-off-by: NJyri Sarha <jsarha@ti.com>

Currently enabling TI LCDC DRM support automatically pulls in
fbdev dependency. However this dep is unnecessary since
DRM core already handles this for us (DRM_FBDEV_EMULATION).
Signed-off-by: NTobias Jakobi <tjakobi@math.uni-bielefeld.de>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1468586897-32298-13-git-send-email-tjakobi@math.uni-bielefeld.de

Remove legacy usage of drm_handle_vblank()
Signed-off-by: NGustavo Padovan <gustavo.padovan@collabora.co.uk>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1467677092-5089-6-git-send-email-gustavo@padovan.org

We already have a fallback in place to fill out the unique from
dev->unique, which is set to something reasonable in drm_dev_alloc.

Which means we only need to have a special set_busid for pci devices,
to be able to care the backwards compat code for drm 1.1 around, which
libdrm still needs.

While developing and testing this patch things blew up in really
interesting ways, and the code is rather confusing in naming things
between the kernel code, ioctl #defines and libdrm. For the next brave
dragon slayer, document all this madness properly in the userspace
interface section of gpu.tmpl.

v2: Make drm_dev_set_unique static and update kerneldoc.

v3: Entire rewrite, plus document what's going on for posterity in the
gpu docbook uapi section.

v4: Drop accidental amdgpu hunk (Emil).

v5: Drop accidental omapdrm vblank counter change (Emil).

v6: Rebase on top of the sphinx conversion.

Cc: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Cc: Emil Velikov <emil.l.velikov@gmail.com>
Tested-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk> (virt_gpu)
Reviewed-by: NEmil Velikov <emil.l.velikov@gmail.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@intel.com>

No dev->struct_mutex anywhere to be seen.

Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1464630800-30786-14-git-send-email-daniel.vetter@ffwll.ch

Most users of IS_ERR_VALUE() in the kernel are wrong, as they
pass an 'int' into a function that takes an 'unsigned long'
argument. This happens to work because the type is sign-extended
on 64-bit architectures before it gets converted into an
unsigned type.

However, anything that passes an 'unsigned short' or 'unsigned int'
argument into IS_ERR_VALUE() is guaranteed to be broken, as are
8-bit integers and types that are wider than 'unsigned long'.

Andrzej Hajda has already fixed a lot of the worst abusers that
were causing actual bugs, but it would be nice to prevent any
users that are not passing 'unsigned long' arguments.

This patch changes all users of IS_ERR_VALUE() that I could find
on 32-bit ARM randconfig builds and x86 allmodconfig. For the
moment, this doesn't change the definition of IS_ERR_VALUE()
because there are probably still architecture specific users
elsewhere.

Almost all the warnings I got are for files that are better off
using 'if (err)' or 'if (err < 0)'.
The only legitimate user I could find that we get a warning for
is the (32-bit only) freescale fman driver, so I did not remove
the IS_ERR_VALUE() there but changed the type to 'unsigned long'.
For 9pfs, I just worked around one user whose calling conventions
are so obscure that I did not dare change the behavior.

I was using this definition for testing:

 #define IS_ERR_VALUE(x) ((unsigned long*)NULL == (typeof (x)*)NULL && \
       unlikely((unsigned long long)(x) >= (unsigned long long)(typeof(x))-MAX_ERRNO))

which ends up making all 16-bit or wider types work correctly with
the most plausible interpretation of what IS_ERR_VALUE() was supposed
to return according to its users, but also causes a compile-time
warning for any users that do not pass an 'unsigned long' argument.

I suggested this approach earlier this year, but back then we ended
up deciding to just fix the users that are obviously broken. After
the initial warning that caused me to get involved in the discussion
(fs/gfs2/dir.c) showed up again in the mainline kernel, Linus
asked me to send the whole thing again.

[ Updated the 9p parts as per Al Viro  - Linus ]
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Cc: Andrzej Hajda <a.hajda@samsung.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: https://lkml.org/lkml/2016/1/7/363
Link: https://lkml.org/lkml/2016/5/27/486
Acked-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> # For nvmem part
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

This adds one more argument to of_fdt_unflatten_tree() to specify
the parent node of the FDT blob that is going to be unflattened.
In the result, the function can be used to unflatten FDT blob that
represents device sub-tree in PowerNV PCI hotplug driver.

Cc: Jyri Sarha <jsarha@ti.com>
Signed-off-by: NGavin Shan <gwshan@linux.vnet.ibm.com>
Acked-by: NRob Herring <robh@kernel.org>
Acked-by: NJyri Sarha <jsarha@ti.com>
Signed-off-by: NRob Herring <robh@kernel.org>

Replace the legacy drm_send_vblank_event() with the new helper function.
Signed-off-by: NGustavo Padovan <gustavo.padovan@collabora.co.uk>
Reviewed-by: NJyri Sarha <jsarha@ti.com>
Tested-by: NJyri Sarha <jsarha@ti.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1460656118-16766-11-git-send-email-gustavo@padovan.org

Use devm_kzalloc() and devm_kcalloc() for private data allocation at
driver load time.
Signed-off-by: NJyri Sarha <jsarha@ti.com>
Reviewed-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

Initialize port device node pointer in the tilcdc crtc. Fixes "Falling
back to first CRTC" warning from tda998x driver.

The tda998x encoder driver calls drm_of_find_possible_crtcs() to
initialize possible_crtcs of struct drm_encoder. The crtc->port needs
to be initialized for drm_of_find_possible_crtcs() to work.
Signed-off-by: NJyri Sarha <jsarha@ti.com>
Reviewed-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

Disable the sync lost interrupt if it fires on every frame for 50
consecutive frames in a row. This is relatively sure sign of the sync
lost interrupt being stuck and firing on every frame even if the
display otherwise appears to work OK.
Signed-off-by: NJyri Sarha <jsarha@ti.com>
Reviewed-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

Add ratelimited prints on sync lost and FIFO underrun interrupts.
Signed-off-by: NJyri Sarha <jsarha@ti.com>
Reviewed-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

Removes the duplicate LCDC_INT_ENABLE_SET_REG-entry in registers array.
Signed-off-by: NJyri Sarha <jsarha@ti.com>
Reviewed-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

Fix interrupt enable/disable code for version 2 tilcdc. In version 2
tilcdc there is a separate register for disabling interrupts. Writing
0 to enable registers bits does not have any effect. The interrupt
clear register works the same way, writing 1 to specific bit disables
the interrupt and writing 0 does not have any effect.

The "bug" that is fixed here does not really do any harm since the
interrupts are enabled only once in the power up and disabled before
power down.
Signed-off-by: NJyri Sarha <jsarha@ti.com>
Reviewed-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

Do not update the next frame buffer close to vertical blank. This is
to avoid situation when the frame changes between writing of
LCDC_DMA_FB_BASE_ADDR_0_REG and LCDC_DMA_FB_CEILING_ADDR_0_REG.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>
[Added description to the patch]
Signed-off-by: NJyri Sarha <jsarha@ti.com>

Get rid of complex ping-pong mechanism and replace it with simpler
single buffer flipping code.

The LCDC HW appears to be designed mainly static framebuffers in
mind. There are two modes of operation, either static single buffer,
or ping pong double buffering with two static buffers switching back
and forth. Luckily the framebuffer start address is fetched only in
the beginning of the frame and changing the address after that only
takes effect after the next vertical blank. The page flipping code can
simply write the address of the new framebuffer and the page is
flipped automatically after the next vertical blank. Using the ping
pong double buffering makes the flipping code way more complex and it
does not provide any benefit, so it is better to switch to single
buffer operation.

There is still one problem in updating the framebuffer dma address on
the fly. There are two registers defining the framebuffer dma area and
things may break if the dma address is fetched in while the registers
are are being updated.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>
[Added description to the patch]
Signed-off-by: NJyri Sarha <jsarha@ti.com>