Collabora contributions to Linux Kernel 4.2

Posted on 25/08/2015 by Gustavo Padovan

A total of 63 patches were contributed upstream by Collabora engineers as part of our current projects.

In the ARM multi_v7_defconfig we have the addition of support for Exynos Chromebooks, all options that had a tristate Kconfig option were added as module. After this change it was found that a few drivers weren’t working  properly when built as module, so this was fixed. This work was done by Javier Martinez.

Javier also added multi EC support as newer Chromebooks have more than one Embedded Controller in the system.

Tomeu Vizoso added EMC (External Memory Controller) support to the Tegra124 platform.

On the DRM side initial support for Atomic Modesetting was added to Exynos devices by Gustavo Padovan. The Atomic Modesetting interface allows all screen updates such as changing modes, pageflip and set planes/cursors to happen in the same IOCTL. Thus everything can be updated atomically. More on that can be found at Daniel Vetter’s post at LWN.net. Another contribution, from Daniel Stone, to Atomic Modesetting was the addition of the CRTC state mode property, it is through this property that userspace configure a modeset that will be updated via an Atomic Modesetting ioctl.

Following is a list of all patches submitted by Collabora for this kernel release:

Daniel Stone (17):

• drm/atomic: Don’t open-code CRTC state destroy
• drm: Don’t leak path blob property when updating
• drm: Introduce helper for replacing blob properties
• drm: Introduce blob_lock
• drm: Add reference counting to blob properties
• drm: kerneldoc fixes for blob properties
• drm/crtc_helper: Replace open-coded CRTC state helpers
• drm/mode: Validate modes inside drm_crtc_convert_umode
• drm/mode: Unstatic kernel-userspace mode conversion
• drm: Allow creating blob properties without copy
• drm: Return error value from blob creation
• drm/mode: Add user blob-creation ioctl
• drm: Retain reference to blob properties in lookup
• drm: Add drm_atomic_set_mode_for_crtc
• drm/atomic: Add current-mode blob to CRTC state
• drm/atomic: Add MODE_ID property
• drm: Always enable atomic API

Gustavo Padovan (17):

• drm/atomic: remove duplicated assignment of old_plane_state
• drm/exynos: atomic phase 1: use drm_plane_helper_update()
• drm/exynos: atomic phase 1: use drm_plane_helper_disable()
• drm/exynos: atomic phase 1: add .mode_set_nofb() callback
• drm/exynos: atomic phase 2: wire up state reset(), duplicate() and destroy()
• drm/exynos: atomic phase 2: keep track of framebuffer pointer
• drm/exynos: atomic phase 3: atomic updates of planes
• drm/exynos: atomic phase 3: use atomic .set_config helper
• drm/exynos: atomic phase 3: convert page flips
• drm/exynos: remove exported functions from exynos_drm_plane
• drm/exynos: don’t disable unused functions at init
• drm/exynos: move exynos_drm_crtc_disable()
• drm/exynos: add exynos specific .atomic_commit()
• drm/exynos: atomic dpms support
• drm/exynos: remove unnecessary calls to disable_plane()
• drm/exynos: split exynos_crtc->dpms in enable() and disable()
• drm/exynos: add error messages if clks failed to get enabled

Javier Martinez Canillas (19):

• drm/bridge: ptn3460: Fix I2C ID table to match the reported modalias
• pwm: samsung: Use MODULE_DEVICE_TABLE() to include OF modalias
• ARM: multi_v7_defconfig: Enable support for Samsung S3C64XX SPI
• ARM: multi_v7_defconfig: Enable max77802 regulator, rtc and clock drivers
• ARM: multi_v7_defconfig: Enable Exynos USB PHY drivers support
• ARM: multi_v7_defconfig: Enable support for missing ChromeOS EC drivers
• ARM: multi_v7_defconfig: Enable Samsung PWM support
• ARM: multi_v7_defconfig: Enable Samsung S3C SoC RTC
• ARM: multi_v7_defconfig: Enable options for Exynos display support
• ARM: multi_v7_defconfig: Enable GPIO-based I2C arbitration support
• ARM: multi_v7_defconfig: Enable Cypress APA I2C Trackpad support
• mfd: cros_ec: Use a zero-length array for command data
• mfd: cros_ec: Move protocol helpers out of the MFD driver
• irqchip: exynos-combiner: Save IRQ enable set on suspend
• mfd: max77686: Remove unused struct max77686_opmode_data
• rtc: max77686: Report platform modalias to fix module autoload
• rtc: max77802: Report platform modalias to fix module autoload
• platform/chrome: Don’t make CHROME_PLATFORMS depends on X86 || ARM
• mfd: Remove MFD_CROS_EC_SPI depends on OF

Tomeu Vizoso (11):

• of: Document long-ram-code property in nvidia,tegra20-apbmisc
• memory: tegra: Disable ARBITRATION_EMEM interrupt
• of: Document timings subnode of nvidia,tegra-mc
• clk: Expose clk_hw_reparent() to providers
• of: document new emc-timings subnode in nvidia,tegra124-car
• of: document external-memory-controller property in tegra124-car
• clk: tegra: Set the EMC clock as the parent of the MC clock
• clk: tegra: Have EMC clock implement determine_rate()
• ARM: dts: Add syscon property to the MIPI phy in exynos5420
• of: constify drv arg of of_driver_match_device stub
• memory: omap-gpmc: Don’t try to save uninitialized GPMC context

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