# \[PATCH v2 0/22\] On-demand device probing - Subsystems: FRAMEBUFFER LAYER, ACPI, BACKLIGHT CLASS/SUBSYSTEM, COMMON CLK FRAMEWORK, DMA GENERIC OFFLOAD ENGINE SUBSYSTEM, DRIVER CORE, KOBJECTS, DEBUGFS AND SYSFS, DRM DRIVERS, DRM DRIVERS AND MISC GPU PATCHES, DRM DRIVERS FOR NVIDIA TEGRA, DRM PANEL DRIVERS, GENERIC PHY FRAMEWORK, GPIO SUBSYSTEM, I2C SUBSYSTEM, OPEN FIRMWARE AND FLATTENED DEVICE TREE, PIN CONTROL SUBSYSTEM, PWM SUBSYSTEM, SOFTWARE NODES AND DEVICE PROPERTIES, SOUND, SOUND - SOC LAYER / DYNAMIC AUDIO POWER MANAGEMENT (ASoC), THE REST, USB SUBSYSTEM, VOLTAGE AND CURRENT REGULATOR FRAMEWORK - Maintainers: Helge Deller, "Rafael J. Wysocki", Lee Jones, Daniel Thompson, Jingoo Han, Stephen Boyd, Brian Masney, Jerome Brunet, Vinod Koul, Greg Kroah-Hartman, Danilo Krummrich, Johan Hovold, David Airlie, Simona Vetter, Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann, Thierry Reding, Mikko Perttunen, Neil Armstrong, Linus Walleij, Bartosz Golaszewski, Andi Shyti, Rob Herring, Saravana Kannan, Uwe Kleine-König, Jaroslav Kysela, Takashi Iwai, Liam Girdwood, Mark Brown, Linus Torvalds - Series: 22 patches touching 20 files, +264/-44 - Status: SUPERSEDED (Superseded by v7 posted 2015-09-29) - Superseded by v7 (posted 2015-09-29). - Revision v2 (6 revisions archived). - List: linux-fbdev - 3 messages, 2 authors - Page: https://ratatoskr.run/linux-fbdev/2015/07/4544884/t ## \[PATCH v2 0/22\] On-demand device probing - From: Tomeu Vizoso \ - Date: 2015-07-28 13:20:41 - Message: https://ratatoskr.run/linux-fbdev/2015/07/4544884.md ```text Hello, I have a problem with the panel on my Tegra Chromebook taking longer than expected to be ready during boot (Stéphane Marchesin reported what is basically the same issue in [0]), and have looked into ordered probing as a better way of solving this than moving nodes around in the DT or playing with initcall levels and linking order. While reading the thread [1] that Alexander Holler started with his series to make probing order deterministic, it occurred to me that it should be possible to achieve the same by probing devices as they are referenced by other devices. This basically reuses the information that is already implicit in the probe() implementations, saving us from refactoring existing drivers or adding information to DTBs. During review of v1 of this series Linus Walleij suggested that it should be the device driver core to make sure that dependencies are ready before probing a device. I gave this idea a try [2] but Mark Brown pointed out to the logic duplication between the resource acquisition and dependency discovery code paths (though I think it's fairly minor). To address that code duplication I experimented with Arnd's devm_probe [3] concept of having drivers declare their dependencies instead of acquiring them during probe, and while it worked [4], I don't think we end up winning anything when compared to just probing devices on-demand from resource getters. One remaining objection is to the "sprinkling" of calls to fwnode_ensure_device() in the resource getters of each subsystem, but I think it's the right thing to do given that the storage of resources is currently subsystem-specific. We could avoid the above by moving resource storage into the core, but I don't think there's a compelling case for that. I have tested this on boards with Tegra, iMX.6, Exynos and OMAP SoCs, and these patches were enough to eliminate all the deferred probes (except one in PandaBoard because omap_dma_system doesn't have a firmware node as of yet). With this series I get the kernel to output to the panel in 0.5s, instead of 2.8s. Regards, Tomeu [0] http://lists.freedesktop.org/archives/dri-devel/2014-August/066527.html [1] https://lkml.org/lkml/2014/5/12/452 [2] https://lkml.org/lkml/2015/6/17/305 [3] http://article.gmane.org/gmane.linux.ports.arm.kernel/277689 [4] https://lkml.org/lkml/2015/7/21/441 Changes in v2: - Move delay to platform.c - Use set_primary_fwnode() - Use of_node_full_name() - Move the logic for finding a platform device from its firmware node to of/platform.c as it's not needed for ACPI nodes. - Add acpi_dev_get_device() - Add fwnode_ensure_device() so the mechanism for probing devices on demand is independent of the firmware format. - Acquire regulator device lock before returning from regulator_dev_lookup() Tomeu Vizoso (22): platform: delay device-driver matches until late_initcall of/platform: Set fwnode field for new devices device property: add fwnode_get_name() of/platform: add of_platform_device_find() ACPI: add acpi_dev_get_device() device property: add fwnode_ensure_device() gpio: Probe GPIO drivers on demand gpio: Probe pinctrl devices on demand regulator: core: Reduce critical area in _regulator_get regulator: core: Probe regulators on demand drm: Probe panels on demand drm/tegra: Probe dpaux devices on demand i2c: core: Probe i2c master devices on demand pwm: Probe PWM chip devices on demand backlight: Probe backlight devices on demand usb: phy: Probe phy devices on demand clk: Probe clk providers on demand pinctrl: Probe pinctrl devices on demand phy: core: Probe phy providers on demand dma: of: Probe DMA controllers on demand power-supply: Probe power supplies on demand ASoC: core: Probe components on demand drivers/base/platform.c | 28 +++++++++++ drivers/base/property.c | 73 +++++++++++++++++++++++++++ drivers/clk/clk.c | 3 ++ drivers/dma/of-dma.c | 2 + drivers/gpio/gpiolib-of.c | 4 ++ drivers/gpu/drm/drm_panel.c | 2 + drivers/gpu/drm/tegra/dpaux.c | 2 + drivers/i2c/i2c-core.c | 2 + drivers/of/platform.c | 61 +++++++++++++++++++++++ drivers/phy/phy-core.c | 2 + drivers/pinctrl/devicetree.c | 1 + drivers/power/power_supply_core.c | 2 + drivers/pwm/core.c | 2 + drivers/regulator/core.c | 99 +++++++++++++++++++++---------------- drivers/usb/phy/phy.c | 2 + drivers/video/backlight/backlight.c | 2 + include/linux/acpi.h | 10 ++++ include/linux/of_platform.h | 1 + include/linux/property.h | 4 ++ sound/soc/soc-core.c | 6 ++- 20 files changed, 264 insertions(+), 44 deletions(-) -- 2.4.3 ``` ## \[PATCH v2 15/22\] backlight: Probe backlight devices on demand - From: Tomeu Vizoso \ - Date: 2015-07-28 13:21:13 - Message: https://ratatoskr.run/linux-fbdev/2015/07/4544905.md ```text When looking up a backlight device through its firmware node, probe it if it hasn't already. The goal is to reduce deferred probes to a minimum, as it makes it very cumbersome to find out why a device failed to probe, and can introduce very big delays in when a critical device is probed. Signed-off-by: Tomeu Vizoso --- Changes in v2: None drivers/video/backlight/backlight.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c index bddc8b17a4d8..f7151d916435 100644 --- a/drivers/video/backlight/backlight.c +++ b/drivers/video/backlight/backlight.c @@ -559,6 +559,8 @@ struct backlight_device *of_find_backlight_by_node(struct device_node *node) { struct device *dev; + fwnode_ensure_device(&node->fwnode); + dev = class_find_device(backlight_class, NULL, node, of_parent_match); return dev ? to_backlight_device(dev) : NULL; -- 2.4.3 ``` ## Re: \[PATCH v2 0/22\] On-demand device probing - From: Rafael J. Wysocki \ - Date: 2015-07-29 00:09:45 - Message: https://ratatoskr.run/linux-fbdev/2015/07/4545429.md ```text On Tuesday, July 28, 2015 03:19:31 PM Tomeu Vizoso wrote: > Hello, > > I have a problem with the panel on my Tegra Chromebook taking longer > than expected to be ready during boot (Stéphane Marchesin reported what > is basically the same issue in [0]), and have looked into ordered > probing as a better way of solving this than moving nodes around in the > DT or playing with initcall levels and linking order. > > While reading the thread [1] that Alexander Holler started with his > series to make probing order deterministic, it occurred to me that it > should be possible to achieve the same by probing devices as they are > referenced by other devices. > > This basically reuses the information that is already implicit in the > probe() implementations, saving us from refactoring existing drivers or > adding information to DTBs. > > During review of v1 of this series Linus Walleij suggested that it > should be the device driver core to make sure that dependencies are > ready before probing a device. I gave this idea a try [2] but Mark Brown > pointed out to the logic duplication between the resource acquisition > and dependency discovery code paths (though I think it's fairly minor). > > To address that code duplication I experimented with Arnd's devm_probe > [3] concept of having drivers declare their dependencies instead of > acquiring them during probe, and while it worked [4], I don't think we > end up winning anything when compared to just probing devices on-demand > from resource getters. > > One remaining objection is to the "sprinkling" of calls to > fwnode_ensure_device() in the resource getters of each subsystem, but I > think it's the right thing to do given that the storage of resources is > currently subsystem-specific. > > We could avoid the above by moving resource storage into the core, but I > don't think there's a compelling case for that. > > I have tested this on boards with Tegra, iMX.6, Exynos and OMAP SoCs, > and these patches were enough to eliminate all the deferred probes > (except one in PandaBoard because omap_dma_system doesn't have a > firmware node as of yet). > > With this series I get the kernel to output to the panel in 0.5s, > instead of 2.8s. Can you trim your CC list somewhat, please? I'm definitely going to look at this, but not before then next week. Sorry about that. Thanks, Rafael ```