| Message ID | 20231220165423.v2.6.I06b059021de1bf6103e60a73211f078f2af75d17@changeid (mailing list archive) |
|---|---|
| State | Accepted |
| Headers | show |
| Series | Improve IRQ wake capability reporting and update the cros_ec driver to use it | expand |
On 21/12/2023 00:54, Mark Hasemeyer wrote: > The cros_ec driver currently assumes that cros-ec-spi compatible device > nodes are a wakeup-source even though the wakeup-source property is not > defined. > > Add the wakeup-source property to all cros-ec-spi compatible device > nodes to match expected behavior. > You do not need this property, if driver assumes that. Just enable it unconditionally. I don't think anything from previous discussion was resolved. Best regards, Krzysztof
> You do not need this property, if driver assumes that. Just enable it > unconditionally. The goal of this patch series is to change exactly that: to prevent the driver from unconditionally enabling the irq for wake. The driver works across numerous buses (spi, uart, i2c, lpc) and supports DT and ACPI. SPI+DT systems all happen to need irq wake enabled. > I don't think anything from previous discussion was > resolved. Which previous discussion do you mean? In v1 it was suggested to split up the DTS changes by arch/soc and add a cover letter (which I did). Wrt to the binding discussion, Sudeep said the new documentation wording looked good to him [1]. [1]: https://lore.kernel.org/all/ZYAjxxHcCOgDVMTQ@bogus/
On 21/12/2023 19:29, Mark Hasemeyer wrote: >> You do not need this property, if driver assumes that. Just enable it >> unconditionally. > > The goal of this patch series is to change exactly that: to prevent > the driver from unconditionally enabling the irq for wake. But why? What is the problem being solved? Is unconditional wakeup in the driver incorrect? If so, mention it shortly in the commit msg, what is rationale because existing one does not justify this change. > The driver works across numerous buses (spi, uart, i2c, lpc) and > supports DT and ACPI. > SPI+DT systems all happen to need irq wake enabled. > >> I don't think anything from previous discussion was >> resolved. > > Which previous discussion do you mean? In v1 it was suggested to split https://lore.kernel.org/all/20231213221124.GB2115075-robh@kernel.org/ Best regards, Krzysztof
> >> You do not need this property, if driver assumes that. Just enable it > >> unconditionally. > > > > The goal of this patch series is to change exactly that: to prevent > > the driver from unconditionally enabling the irq for wake. > > But why? What is the problem being solved? Is unconditional wakeup in > the driver incorrect? If so, mention it shortly in the commit msg, what > is rationale because existing one does not justify this change. The cover letter talks about it: "Currently the cros_ec driver assumes that its associated interrupt is wake capable. This is an incorrect assumption as some Chromebooks use a separate wake pin, while others overload the interrupt for wake and IO." With the current assumption, spurious wakes can occur on systems that use a separate wake pin. I can add wording to the dts patches to help clarify. > > The driver works across numerous buses (spi, uart, i2c, lpc) and > > supports DT and ACPI. > > SPI+DT systems all happen to need irq wake enabled. > > > >> I don't think anything from previous discussion was > >> resolved. > > > > Which previous discussion do you mean? In v1 it was suggested to split > > https://lore.kernel.org/all/20231213221124.GB2115075-robh@kernel.org/ Hmm, I thought that was addressed [2]. I was referencing the existing binding documentation. From there, there was discussion about updating the docs to clarify what was actually intended (patch 3 in this series). I also addressed the ABI break concern in the thread and mentioned it in patch 22. "For device tree base systems, it is not an issue as the relevant device tree entries have been updated and DTS is built from source for each ChromeOS update." Is there a specific concern you feel is not resolved? Or can I make something more clear? [2] https://lore.kernel.org/all/CANg-bXCG61HFW7JFuAd3k+OrCG_F9F3e8brjM-pmBauS53aobQ@mail.gmail.com/
On 21/12/2023 20:24, Mark Hasemeyer wrote: >>>> You do not need this property, if driver assumes that. Just enable it >>>> unconditionally. >>> >>> The goal of this patch series is to change exactly that: to prevent >>> the driver from unconditionally enabling the irq for wake. >> >> But why? What is the problem being solved? Is unconditional wakeup in >> the driver incorrect? If so, mention it shortly in the commit msg, what >> is rationale because existing one does not justify this change. > > The cover letter talks about it: > "Currently the cros_ec driver assumes that its associated interrupt is > wake capable. This is an incorrect assumption as some Chromebooks use > a separate wake pin, while others overload the interrupt for wake and > IO." > With the current assumption, spurious wakes can occur on systems that > use a separate wake pin. This sentence would be enough. > I can add wording to the dts patches to help clarify. > >>> The driver works across numerous buses (spi, uart, i2c, lpc) and >>> supports DT and ACPI. >>> SPI+DT systems all happen to need irq wake enabled. >>> >>>> I don't think anything from previous discussion was >>>> resolved. >>> >>> Which previous discussion do you mean? In v1 it was suggested to split >> >> https://lore.kernel.org/all/20231213221124.GB2115075-robh@kernel.org/ > > Hmm, I thought that was addressed [2]. I was referencing the existing > binding documentation. From there, there was discussion about updating > the docs to clarify what was actually intended (patch 3 in this > series). I also addressed the ABI break concern in the thread and > mentioned it in patch 22. > "For device tree base systems, it is not an issue as the relevant > device tree entries have been updated and DTS is built from source for > each ChromeOS update." > > Is there a specific concern you feel is not resolved? Or can I make > something more clear? > Seems fine, thanks. Best regards, Krzysztof
On Wed, 20 Dec 2023 16:54:20 -0700, Mark Hasemeyer wrote: > The cros_ec driver currently assumes that cros-ec-spi compatible device > nodes are a wakeup-source even though the wakeup-source property is not > defined. > > Add the wakeup-source property to all cros-ec-spi compatible device > nodes to match expected behavior. > > [...] Applied, thanks! [06/22] ARM: dts: samsung: exynos5420: Enable cros-ec-spi as wake source https://git.kernel.org/krzk/linux/c/8f51b5290ff4f8a9f1c634cf42ca37cd9e90018c Best regards,
diff --git a/arch/arm/boot/dts/samsung/exynos5420-peach-pit.dts b/arch/arm/boot/dts/samsung/exynos5420-peach-pit.dts index 4e757b6e28e1c..3759742d38cac 100644 --- a/arch/arm/boot/dts/samsung/exynos5420-peach-pit.dts +++ b/arch/arm/boot/dts/samsung/exynos5420-peach-pit.dts @@ -967,6 +967,7 @@ cros_ec: cros-ec@0 { reg = <0>; spi-max-frequency = <3125000>; google,has-vbc-nvram; + wakeup-source; controller-data { samsung,spi-feedback-delay = <1>;
The cros_ec driver currently assumes that cros-ec-spi compatible device nodes are a wakeup-source even though the wakeup-source property is not defined. Add the wakeup-source property to all cros-ec-spi compatible device nodes to match expected behavior. Signed-off-by: Mark Hasemeyer <markhas@chromium.org> --- Changes in v2: -Split by arch/soc arch/arm/boot/dts/samsung/exynos5420-peach-pit.dts | 1 + 1 file changed, 1 insertion(+)