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Groups > linux.kernel > #1424706 > unrolled thread
| Started by | Marek Szyprowski <m.szyprowski@samsung.com> |
|---|---|
| First post | 2016-06-17 08:30 +0200 |
| Last post | 2016-06-17 08:30 +0200 |
| Articles | 1 — 1 participant |
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Re: [PATCH 1/3] PM / Runtime: Add notifiers for device runtime PM events Marek Szyprowski <m.szyprowski@samsung.com> - 2016-06-17 08:30 +0200
| From | Marek Szyprowski <m.szyprowski@samsung.com> |
|---|---|
| Date | 2016-06-17 08:30 +0200 |
| Subject | Re: [PATCH 1/3] PM / Runtime: Add notifiers for device runtime PM events |
| Message-ID | <rKVrY-2WT-13@gated-at.bofh.it> |
Hi Rafael, On 2016-06-08 19:18, Rafael J. Wysocki wrote: > On Wed, Jun 8, 2016 at 12:25 PM, Marek Szyprowski > <m.szyprowski@samsung.com> wrote: >> From: Krzysztof Kozlowski<k.kozlowski@samsung.com> >> >> Allow drivers registering for certain runtime PM events of other >> devices. Some drivers in power domain are more or less coupled. When one >> driver is suspending (thus leading to power domain being also turned >> off) the other might have to perform some necessary steps. For example >> Exynos IOMMU has to save its context. >> >> Based on previous work of Sylwester Nawrocki<s.nawrocki@samsung.com>. >> >> Signed-off-by: Krzysztof Kozlowski<k.kozlowski@samsung.com> >> Signed-off-by: Marek Szyprowski<m.szyprowski@samsung.com> > No, this is not the right way to address this and using notifiers for > that is just wrong (because of the potential ordering issues). > > Also, the problem is not limited to runtime PM, but also to system > suspend/resume and initialization/shutdown. > > I posted a series of device dependencies patches a few months ago that > might help to address this problem, but there was almost no interest > in it at that time. I spent some time digging for your patches. Sadly no list archives had them all and I finally found them only in the linux-pm patchwork. This may explain why there was almost no interest in them. After some debugging I've managed to get it working for my case. I will include your patches in my v2 patchset together with the fixes needed to get it working. Best regards -- Marek Szyprowski, PhD Samsung R&D Institute Poland
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