drm/bridge: cdns-mhdp8546: clear the EDID property on failures

If EDID read fails, clear the EDID property.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/a754d9f90fe2addb9d90f9638e3d53dce87bdabc.1706038510.git.jani.nikula@intel.com

drm/bridge: cdns-mhdp8546: switch to ->edid_read callback

Prefer using the struct drm_edid based callback and functions.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/88fde35b8d75860d7a2caad94d774aa96b443754.1706038510.git.jani.nikula@intel.com

drm/bridge: cdns-mhdp8546: Convert to platform remove callback returning void

The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is (mostly) ignored
and this typically results in resource leaks. To improve here there is a
quest to make the remove callback return void. In the first step of this
quest all drivers are converted to .remove_new() which already returns
void.

Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20231102165640.3307820-23-u.kleine-koenig@pengutronix.de

drm/bridge: cdns-mhdp8546: Improve error reporting in remove callback

Replace the generic error message issued by the driver core when the remove
callback returns non-zero ("remove callback returned a non-zero value. This
will be ignored.") by a message that tells the actual problem.

Also simplify a bit by checking the return value of wait_event_timeout a
bit later.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20231102165640.3307820-22-u.kleine-koenig@pengutronix.de

drm/bridge: fix -Wunused-const-variable= warning

When building with W=1, the following warning occurs.

drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c:48:17: warning: ‘anx781x_i2c_addresses’ defined but not used [-Wunused-const-variable=] static const u8 anx781x_i2c_addresses[] = {
^~~~~~~~~~~~~~~~~~~~~
drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c:40:17: warning: ‘anx7808_i2c_addresses’ defined but not used [-Wunused-const-variable=] static const u8 anx7808_i2c_addresses[] = {

When CONFIG_IO is disabled, above two variables are not used,
since the place where it is used is inclueded in the macro
CONFIG_OF.

Even for drivers that do not depend on CONFIG_OF, it's almost
always better to leave out the of_match_ptr(), since the only
thing it can possibly do is to save a few bytes of .text if a
driver can be used both with and without it. Hence we remove
all of_match_ptr() used in other places.

Fixes: 0647e7dd3f7a ("drm/bridge: Add Analogix anx78xx support")
Signed-off-by: Zhu Wang <wangzhu9@huawei.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Robert Foss <rfoss@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230731021345.219588-1-wangzhu9@huawei.com

drm: Explicitly include correct DT includes

The DT of_device.h and of_platform.h date back to the separate
of_platform_bus_type before it as merged into the regular platform bus.
As part of that merge prepping Arm DT support 13 years ago, they
"temporarily" include each other. They also include platform_device.h
and of.h. As a result, there's a pretty much random mix of those include
files used throughout the tree. In order to detangle these headers and
replace the implicit includes with struct declarations, users need to
explicitly include the correct includes.

Signed-off-by: Rob Herring <robh@kernel.org>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Steven Price <steven.price@arm.com>
Acked-by: Liviu Dudau <liviu.dudau@arm.com>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Acked-by: Robert Foss <rfoss@kernel.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230714174545.4056287-1-robh@kernel.org

drm/bridge: cdns-mhdp8546: Fix the interrupt enable/disable

When removing the tidss driver, there is a warning reported by
kernel about an unhandled interrupt for mhdp driver.

[ 43.238895] irq 31: nobody cared (try booting with the "irqpoll" option)
... [snipped backtrace]
[ 43.330735] handlers:
[ 43.333020] [<000000005367c4f9>] irq_default_primary_handler threaded [<000000007e02b601>]
cdns_mhdp_irq_handler [cdns_mhdp8546]
[ 43.344607] Disabling IRQ #31

This happens because as part of cdns_mhdp_bridge_hpd_disable, driver tries
to disable the interrupts. While disabling the SW_EVENT interrupts,
it accidentally enables the MBOX interrupts, which are not handled by
the driver.

Fix this with a read-modify-write to update only required bits.
Use the enable / disable function as required in other places.

Signed-off-by: Nikhil Devshatwar <nikhil.nd@ti.com>
Reviewed-by: Swapnil Jakhade <sjakhade@cadence.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: Aradhya Bhatia <a-bhatia1@ti.com>
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230606082142.23760-9-a-bhatia1@ti.com

drm/bridge: mhdp8546: Set input_bus_flags from atomic_check

input_bus_flags are specified in drm_bridge_timings (legacy) as well
as drm_bridge_state->input_bus_cfg.flags

The flags from the timings will be deprecated. Bridges are supposed
to validate and set the bridge state flags from atomic_check.

Signed-off-by: Nikhil Devshatwar <nikhil.nd@ti.com>
[a-bhatia1: replace timings in cdns_mhdp_platform_info by input_bus_flags]
Signed-off-by: Aradhya Bhatia <a-bhatia1@ti.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230606082142.23760-5-a-bhatia1@ti.com

drm/bridge: mhdp8546: Add minimal format negotiation

With new connector model, mhdp bridge will not create the connector and
SoC driver will rely on format negotiation to setup the encoder format.

Support minimal format negotiations hooks in the drm_bridge_funcs.
Complete format negotiation can be added based on EDID data.
This patch adds the minimal required support to avoid failure
after moving to new connector model.

Signed-off-by: Nikhil Devshatwar <nikhil.nd@ti.com>
[a-bhatia1: Drop the output_fmt check condition]
Signed-off-by: Aradhya Bhatia <a-bhatia1@ti.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230606082142.23760-4-a-bhatia1@ti.com

drm/bridge: Remove unnecessary include statements for drm_crtc_helper.h

Several source files include drm_crtc_helper.h without needing it or
only to get its transitive include statements; leading to unnecessary
compile-time dependencies.

Drop drm_crtc_helper.h where possible.

v2:
* update commit message (Sam)

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230116131235.18917-8-tzimmermann@suse.de

gpu/drm/bridge/cadence: avoid flush_scheduled_work() usage

Like commit c4f135d643823a86 ("workqueue: Wrap flush_workqueue() using a
macro") says, flush_scheduled_work() is dangerous and will be forbidden.
We are on the way for removing all flush_scheduled_work() callers from
the kernel, and this patch is for removing flush_scheduled_work() call
from cadence driver.

Since cdns-mhdp8546 driver uses 4 works

mhdp->modeset_retry_work
mhdp->hpd_work
mhdp->hdcp.check_work
mhdp->hdcp.prop_work

I assume that flush_scheduled_work() in cdns_mhdp_remove() needs to wait
for only these 4 works.

Since mhdp->modeset_retry_work already uses cancel_work_sync(), I assume
that flush_scheduled_work() needs to wait for only 3 works. But I came to
wonder whether mhdp->hdcp.check_work should be flushed or cancelled.

While flush_scheduled_work() waits for completion of works which were
already queued to system_wq, mhdp->hdcp.check_work is a delayed work.
That is, this work won't be queued to system_wq unless timeout expires.

Current code will wait for mhdp->hdcp.check_work only if timeout already
expired. If timeout is not expired yet, flush_scheduled_work() will fail
to cancel mhdp->hdcp.check_work, and cdns_mhdp_hdcp_check_work() which is
triggered by mhdp->hdcp.check_work will schedule hdcp->check_work, which
is too late for flush_scheduled_work() to wait for completion of
cdns_mhdp_hdcp_prop_work().

But since I couldn't get comments on how do we want to handle this race
window [1], this patch chose "do nothing" for mhdp->hdcp.check_work and
mhdp->hdcp.prop_work. That is, I assume that flush_scheduled_work() in
cdns_mhdp_remove() needs to wait for only mhdp->hpd_work work.

Link: https://lkml.kernel.org/r/943273cb-c2ec-24e3-5edb-64eacc6e2d30@I-love.SAKURA.ne.jp [1]
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/216591bc-28bb-0453-10bb-59e268dff540@I-love.SAKURA.ne.jp

drm: Remove linux/media-bus-format.h from drm_crtc.h

drm_crtc.h has no need for linux/media-bus-format.h, so don't
include it. Avoids useless rebuilds of the entire universe when
touching linux/media-bus-format.h.

Quite a few placs do currently depend on linux/media-bus-format.h
without actually including it directly. All of those need to be
fixed up.

v2: Deal with ingenic as well
v3: Fix up mxsfb and remaining parts of imx

Acked-by: Sam Ravnborg <sam@ravnborg.org>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220630195114.17407-4-ville.syrjala@linux.intel.com

drm: Drop drm_edid.h from drm_crtc.h

drm_crtc.h has no need for drm_edid.h, so don't include it.
Avoids useless rebuilds of the entire universe when
touching drm_edid.h.

Quite a few placs do currently depend on drm_edid.h without
actually including it directly. All of those need to be fixed
up.

v2: Fix up i915 and msm some more
v3: Fix alphabetical ordering (Sam)

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220614090245.30283-1-ville.syrjala@linux.intel.com
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Acked-by: Jani Nikula <jani.nikula@intel.com>

drm/display: Move HDCP helpers into display-helper module

Move DRM's HDCP helper library into the display/ subdirectory and add
it to DRM's display helpers. Split the header file into core and helpers.
Update all affected drivers. No functional changes.

v3:
* fix Kconfig dependencies
v2:
* fix include statements (Jani, Javier)
* update Kconfig symbols

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220421073108.19226-7-tzimmermann@suse.de

drm: Rename dp/ to display/

Rename dp/ to display/ to account for additional display-related
helpers, such as HDMI. Update all related include statements. No
functional changes.

Various drivers, such as i915 and amdgpu, use similar naming scheme
by putting code for video-output standards into a local display/
directory. The new directory's name is aligned with this convention.

v2:
* update commit message (Javier)

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220421073108.19226-3-tzimmermann@suse.de

drm/connector: Fix typo in output format

The HDMI specification mentions YCbCr everywhere, but our enums have
YCrCb. Let's rename it to match.

Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220120151625.594595-5-maxime@cerno.tech

drm/dp: Move public DisplayPort headers into dp/

Move all public DisplayPort headers into dp/ and update users. No
functional changes.

v3:
* rebased onto latest drm-tip

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Daniel Vetter <daniel@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20220114114535.29157-5-tzimmermann@suse.de

drm: bridge: cdns-mhdp8546: Fix PM reference leak in

pm_runtime_get_sync will increment pm usage counter even it failed.
Forgetting to putting operation will result in reference leak here.
Fix it by replacing it with pm_runtime_resume_and_get to keep usage
counter balanced.

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Robert Foss <robert.foss@linaro.org>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20210531135622.3348252-1-yukuai3@huawei.com

drm: bridge: cdns-mhdp8546: Fix inconsistent indenting

Eliminate the follow smatch warning:

drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c:2143
cdns_mhdp_bridge_atomic_reset() warn: inconsistent indenting.

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Reviewed-by: Robert Foss <robert.foss@linaro.org>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1621852953-51325-1-git-send-email-jiapeng.chong@linux.alibaba.com

drm/dp: Add backpointer to drm_device in drm_dp_aux

This is something that we've wanted for a while now: the ability to
actually look up the respective drm_device for a given drm_dp_aux struct.
This will also allow us to transition over to using the drm_dbg_*() helpers
for debug message printing, as we'll finally have a drm_device to reference
for doing so.

Note that there is one limitation with this - because some DP AUX adapters
exist as platform devices which are initialized independently of their
respective DRM devices, one cannot rely on drm_dp_aux->drm_dev to always be
non-NULL until drm_dp_aux_register() has been called. We make sure to point
this out in the documentation for struct drm_dp_aux.

v3:
* Add WARN_ON_ONCE() to drm_dp_aux_register() if drm_dev isn't filled out

Signed-off-by: Lyude Paul <lyude@redhat.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210423184309.207645-4-lyude@redhat.com
Reviewed-by: Dave Airlie <airlied@redhat.com>

drm/bridge/cdns-mhdp8546: Register DP aux channel with userspace

Just adds some missing calls to
drm_dp_aux_register()/drm_dp_aux_unregister() for when we attach/detach the
bridge.

Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210423184309.207645-2-lyude@redhat.com
Reviewed-by: Dave Airlie <airlied@redhat.com>

drm: bridge: cdns-mhdp8546: Enable HDCP

This patch enable HDCP in MHDP driver.

Signed-off-by: Parshuram Thombare <pthombar@cadence.com>
Reviewed-by: Robert Foss <robert.foss@linaro.org>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1618078542-30679-1-git-send-email-pthombar@cadence.com

drm: use getter/setter functions

Use getter and setter functions, for platform_device structures and a
mipi_dsi_device structure.

Signed-off-by: Julia Lawall <Julia.Lawall@inria.fr>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20210209211304.1261740-1-Julia.Lawall@inria.fr

drm: bridge: cdns-mhdp8546: fix compile warning

On x64 we get:

drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c:751:10: warning: conversion from 'long unsigned int' to 'unsigned int' changes value from '18446744073709551613' to '4294967293' [-Woverflow]

The registers are 32 bit, so fix by casting to u32.

Fixes: fb43aa0acdfd ("drm: bridge: Add support for Cadence MHDP8546 DPI/DP bridge")
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Reviewed-by: Swapnil Jakhade <sjakhade@cadence.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20200929091918.24813-1-tomi.valkeinen@ti.com

drm: bridge: cdns-mhdp8546: Add TI J721E wrapper

Add J721E wrapper for mhdp, which sets up the clock and data muxes.

Signed-off-by: Jyri Sarha <jsarha@ti.com>
Signed-off-by: Yuti Amonkar <yamonkar@cadence.com>
Signed-off-by: Swapnil Jakhade <sjakhade@cadence.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drm: bridge: Add support for Cadence MHDP8546 DPI/DP bridge

Add a new DRM bridge driver for Cadence MHDP8546 DPTX IP used in TI J721E
SoC. MHDP DPTX IP is the component that complies with VESA DisplayPort (DP)
and embedded Display Port (eDP) standards. It integrates uCPU running the
embedded Firmware (FW) interfaced over APB interface.

Basically, it takes a DPI stream as input and outputs it encoded in DP
format. Currently, it supports only SST mode.

Co-developed-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Co-developed-by: Jyri Sarha <jsarha@ti.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: Jyri Sarha <jsarha@ti.com>
Signed-off-by: Quentin Schulz <quentin.schulz@free-electrons.com>
Signed-off-by: Yuti Amonkar <yamonkar@cadence.com>
Signed-off-by: Swapnil Jakhade <sjakhade@cadence.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>