A few weeks ago, in the final days leading up to Christmas, Linus Torvalds released version 4.20 of the Linux Kernel. Collaborans were once again active during this development cycle, contributing 22 patches, 112 reviews & 55 sign-offs. Below is a summary of their contributions. As is the custom, head to LWN.net if you would like to read more about the merge window for 4.20 (part 1 & part 2).

Graphics:

• Robert Foss ensured that dma_fence_put() is called in msm_ioctl_gem_submit() even if dma_fence_wait fail.
• Sebastian Reichel fixed a couple of recent regressions in omapdrm's DSI support and reviewed the ongoing work to use DRM's common panel and bridge code in the driver.
• Ezequiel Garcia added prime mapping support to the virtio-gpu graphics driver. This allows to use the virtio-gpu in an exporter role, e.g. importing buffers in media drivers.

Here, there and everywhere:

• Gabriel Krisman Bertazi fixed a build error in ext4 code when DX_DEBUG is enabled.
• Enric Balletbò contributed several interesting commits. He modified the backlight driver by adding an API to configure and enable pwm in one call and fixing backlight brightness level for non device tree cases. He also cleaned and improved mfd documentation, removed a bad sanity checker in rockchip_ddrclk_get_parent and added try_then_request_governor() to ensure that governor module is loaded before to use it.
• Sebastian Reichel added const attribute to all mfd_cell structures in ti-lmu and maintained the power-supply subsystem.

Here is the complete list of Collabora contributions:

Enric Balletbo i Serra (7):

• platform/chrome: Move mfd/cros_ec_lpc* includes to drivers/platform.
• mfd: cros_ec: Fix and improve kerneldoc comments.
• PM / devfreq: Fix devfreq_add_device() when drivers are built as modules.
• backlight: pwm_bl: Switch to using "atomic" PWM API
• clk: rockchip: Fix static checker warning in rockchip_ddrclk_get_parent call
• Revert "mfd: cros_ec: Use devm_kzalloc for private data"
• backlight: pwm_bl: Fix brightness levels for non-DT case.

Ezequiel Garcia (8):

• media: vicodec: Drop unneeded symbol dependency
• media: vicodec: Drop unused job_abort()
• virtio: Add virtio_gpu_object_kunmap()
• virtio: Rework virtio_gpu_object_kmap()
• virtio: Support prime objects vmap/vunmap
• media: dt-bindings: Document the Rockchip VPU bindings
• media: Rename vb2_m2m_request_queue -> v4l2_m2m_request_queue
• media: Revert "media: dt-bindings: Document the Rockchip VPU bindings"

Gabriel Krisman Bertazi (1):

• ext4: fix build error when DX_DEBUG is defined

Robert Foss (1):

• drm/msm: Move fence put to where failure occurs

Sebastian Reichel (5):

• Merge tag 'psy-at91-poweroff-immutable-for-v4.20-signed' into psy-next
• Merge tag 'psy-mfd-cros-immutable-for-v4.20-signed' into psy-next
• mfd: ti-lmu: constify mfd_cell tables
• drm/omap: populate DSI platform bus earlier
• drm/omap: fix incorrect union usage

Reviewed-by:

Emil Velikov (1):

• drm: Update todo.rst

Enric Balletbo i Serra (2):

• mfd: cros: add charger port count command definition
• drm/rockchip: fix coding style and incorrect description

Ezequiel Garcia (1):

• arm64: dts: rockchip: Split out common nodes for Rock960 based boards

Javier Martinez Canillas (1):

• ASoC: max98088: Add master clock handling

Sebastian Reichel (107):

• drm/omap: dsi: Fix missing of_platform_depopulate()
• drm/omap: Move DISPC runtime PM handling to omapdrm
• drm/omap: dsi: Ensure the device is active during probe
• drm/omap: hdmi4: Ensure the device is active during bind
• drm/omap: Populate DSS children in omapdss driver
• Input: pwm-vibrator - correct pwms in DT binding example
• drm/omap: Don't call .set_timings() operation recursively
• drm/omap: Store CRTC timings in .set_timings() operation
• drm/omap: venc: Fixup video mode in .check_timings() operation
• drm/omap: sdi: Fixup video mode in .check_timings() operation
• drm/omap: hdmi: Constify video mode and related pointers
• drm/omap: dsi: Fixup video mode in .set_config() operation
• drm/omap: dpi: Don't fixup video mode in dpi_set_mode()
• drm/omap: Call dispc timings check operation directly
• drm/omap: Split mode fixup and mode set from encoder enable
• drm/omap: Move bus flag hack to encoder implementation
• drm/omap: panels: Don't modify fixed timings
• drm/omap: Remove .get_timings() operation from display connectors
• drm/omap: Query timing information from analog TV encoder
• drm/omap: Don't call .check_timings() operation recursively
• drm/omap: Store bus flags in the omap_dss_device structure
• drm/omap: Don't store video mode internally for external encoders
• drm/omap: Remove unneeded fallback for missing .check_timings()
• drm/omap: Remove duplicate calls to .set_timings() operation
• drm/omap: Make the video_mode pointer to .set_timings() const
• drm/omap: dss: hdmi: Rename hdmi_display_(set|check)_timing() functions
• drm/omap: Determine connector type directly in omap_connector.c
• drm/omap: Pass both output and display omap_dss_device to connector init
• drm/omap: Don't call HDMI mode and infoframe operations recursively
• drm/omap: Pass both output and display omap_dss_device to encoder init
• drm/omap: Get from CRTC to display device directly
• drm/omap: Don't call EDID read operation recursively
• drm/omap: Move HPD disconnection handling to omap_connector
• drm/omap: Merge HPD enable operation with HPD callback registration
• drm/omap: Remove unneeded safety checks in the HPD operations
• drm/omap: Don't call HPD registration operations recursively
• drm/omap: Don't call .detect() operation recursively
• drm/omap: dss: Add device operations flags
• drm/omap: Move most omap_dss_driver operations to omap_dss_device_ops
• drm/omap: panel-tpo-td043mtea1: Convert to the GPIO descriptors API
• drm/omap: panel-tpo-td028ttec1: Drop unneeded linux/gpio.h header
• drm/omap: panel-sony-acx565akm: Convert to the GPIO descriptors API
• drm/omap: panel-nec-nl8048hl11: Convert to the GPIO descriptors API
• drm/omap: encoder-tfp410: Convert to the GPIO descriptors API
• drm/omap: connector-hdmi: Convert to the GPIO descriptors API
• drm/omap: Check omap_dss_device type based on the output_type field
• drm/omap: Remove unnecessary display output sanity checks
• drm/omap: dss: Remove omap_dss_driver .[gs]et_mirror operations
• drm/omap: dss: Remove unused omap_dss_driver operations
• drm/omap: dss: Remove the dss_mgr_(dis)connect() operations
• drm/omap: Set dispc_channel_connect from DSS output connect handlers
• drm/omap: Remove supported output check in CRTC connect handler
• drm/omap: Remove omap_crtc_output global array
• drm/omap: Store CRTC lookup by channel table in omap_drm_private
• drm/omap: Pass pipe pointer to omap_crtc_init()
• drm/omap: dss: Merge two disconnection helpers
• drm/omap: dss: Move display type validation to initialization time
• drm/omap: dss: Move connection checks to omapdss_device_(dis)connect
• drm/omap: Group CRTC, encoder, connector and dssdev in a structure
• drm/omap: Create all planes before CRTCs
• drm/omap: Remove unneeded variable assignments in omap_modeset_init
• drm/omap: dss: Get regulators at probe time
• drm/omap: dss: Remove duplicated parameter to dss_mgr_(dis)connect()
• drm/omap: dss: Add function to retrieve display for an output
• drm/omap: dss: Acquire next dssdev at probe time
• drm/omap: dss: venc: Move initialization code from bind to probe
• drm/omap: dss: hdmi5: Move initialization code from bind to probe
• drm/omap: dss: hdmi4: Move initialization code from bind to probe
• drm/omap: dss: dsi: Move initialization code from bind to probe
• drm/omap: dss: Cleanup error paths in output init functions
• drm/omap: displays: Don't cast dssdev to panel data unnecessarily
• drm/omap: dss: Extend omapdss_of_find_source_for_first_ep() to sinks
• drm/omap: dss: Replace omap_dss_device port number with bitmask
• drm/omap: dss: Modify omapdss_find_output_from_display() to return channel
• drm/omap: dss: Move DSS mgr ops and private data to dss_device
• drm/omap: dss: Store dss_device pointer in omap_dss_device
• drm/omap: dss: Move and rename omap_dss_(get|put)_device()
• drm/omap: dss: Remove panel devices list
• drm/omap: dss: Split omapdss_register_display()
• drm/omap: dss: Make omap_dss_get_next_device() more generic
• drm/omap: dss: Rename for_each_dss_dev macro to for_each_dss_display
• drm/omap: dss: Remove output devices list
• drm/omap: Move DSI debugfs clocks dump to dsi%u_clks files
• drm/omap: dsi: Simplify debugfs implementation
• drm/omap: displays: Remove input omap_dss_device from panel data
• drm/omap: dss: Move src and dst check and set to connection handlers
• drm/omap: dss: Move debug message and checks to connection handlers
• drm/omap: dss: Add functions to connect and disconnect devices
• drm/omap: dss: Move common device operations to common structure
• drm/omap: dss: Allow looking up any device by port
• drm/omap: dss: Rework output lookup by port node
• drm/omap: dss: Create and use omapdss_device_is_registered()
• drm/omap: dss: Create global list of all omap_dss_device instances
• drm/omap: dss: Rename omap_dss_device list field to output_list
• drm/omap: dss: Remove omap_dss_device panel fields
• drm/omap: displays: Remove videomode from omap_dss_device structure
• drm/omap: dss: Constify omap_dss_driver operations structure
• drm/omap: dss: Remove unused omapdss_default_get_timings()
• drm/omap: dss: Remove DSS encoders get_timings operation
• drm/omap: dss: Remove omapdss_atv_ops get_wss and set_wss operations
• drm/omap: dss: Handle DPI and SDI port initialization failures
• drm/omap: dss: Move platform_device_register from core.c to dss.c probe
• drm/omap: dss: Gather OMAP DSS components at probe time
• drm/omap: dss: Remove display ordering from dss/display.c
• drm/omap: Do dss_device (display) ordering in omap_drv.c
• drm/omap: Manage the usable omap_dss_device list within omap_drm_private
• drm/omap: Allocate drm_device earlier and unref it as last step

Signed-off-by:

Gustavo Padovan (1):

• drm/vkms: Use new return type vm_fault_t

Sebastian Reichel (31):

• mfd: ti-lmu: Use of_device_get_match_data() helper
• mfd: ti-lmu: Use managed resource for everything
• mfd: ti-lmu: Switch to GPIOD
• power: max8925: mark expected switch fall-through
• power: supply: fix spelling mistake "Gauage" -> "Gauge"
• power: reset: qcom-pon: Add pms405 pon support
• power: supply: bq27xxx: Add support for BQ27411
• power: supply: Add Spreadtrum SC2731 charger support
• dt-bindings: power: Add Spreadtrum SC2731 charger documentation
• power: supply: twl4030_charger: disable eoc interrupt on linear charge
• power: supply: twl4030_charger: fix charging current out-of-bounds
• power: supply: bq25890_charger: fix semicolon.cocci warnings
• power: supply: max8998-charger: Fix platform data retrieval
• power: supply: cros: add support for dedicated port
• mfd: cros: add charger port count command definition
• power: reset: at91-poweroff: do not procede if at91_shdwc is allocated
• power: reset: at91-poweroff: rename at91_shdwc_base member of struct shdwc
• power: reset: at91-poweroff: make sclk part of struct shdwc
• power: reset: at91-poweroff: make mpddrc_base part of struct shdwc
• power: reset: at91-poweroff: use only one poweroff function
• power: reset: at91-poweroff: switch to slow clock before shutdown
• power: reset: convert to SPDX identifiers
• power: supply: ab8500_fg: silence uninitialized variable warnings
• power: supply: sysfs: ratelimit property read error message
• power: supply: bq25890_charger: Read back the current battery voltage
• power: supply: bq25890_charger: Add the BQ25896 part
• power: supply: bq25890_charger: Remove unused table entries
• power: supply: bq25890_charger: Add debugging output of failed initialization
• power: supply: maxim: Add SPDX license identifiers
• power: supply: ab8500_fg: fix obsolete function
• power: supply: cros_usbpd: remove unused pointer 'dev'

Tested-by:

Ezequiel Garcia (1):

• media: vicodec: set state->info before calling the encode/decode funcs