This patchset fixes mysterious boot hang on Exynos 4210 SoCs, when IOMMU is enabled. There is no direct dependency between IOMMU devices and MDMA1. However enabling IOMMU changes the device probe order, what results in LCD0 power domain being turned off for some time. During that time the registration of MDMA1 device happens, what results in system hangs, because the common bus code tries to read PID/CID registers from turned-off device.
Changes since v3 include some more code refactoring done to fix issues pointed by Ulf Hansson and Russel King. Best regards Marek Szyprowski Samsung R&D Institute Poland Changelog: v4: - fixed more issues pointed by Ulf Hansson and Russell King v3: https://lkml.org/lkml/2015/12/1/334 - fixed issues pointed by Ulf Hansson - dropped patch for exynos4210 dts, because it already got queued for merging v2: https://lkml.org/lkml/2015/11/26/229 - added 2 patches from 'On-demand device probing' thread (https://lkml.org/lkml/2015/9/29/189), which move PID/CIR reading from amba_device_add() to amba_match() - moved dev_pm_domain_attach() to amba_match(), which is allowed to return -EPROBE_DEFER v1: http://www.spinics.net/lists/arm-kernel/msg463185.html - initial version Patch summary: Marek Szyprowski (1): ARM: amba: Properly handle devices with power domains Tomeu Vizoso (2): driver core: handle -EPROBE_DEFER from bus_type.match() ARM: amba: Move reading of periphid to amba_match() Documentation/driver-model/porting.txt | 6 +- drivers/amba/bus.c | 152 ++++++++++++++++++--------------- drivers/base/dd.c | 24 +++++- include/linux/device.h | 7 +- 4 files changed, 112 insertions(+), 77 deletions(-) -- 1.9.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
