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| author | Thierry Reding <treding@nvidia.com> | 2015-10-09 17:51:47 +0200 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2015-10-15 17:58:43 +0200 |
| commit | 4f1d841475e1f6e9e32496dda11215db56f4ea73 (patch) | |
| tree | 6d0156e247660a012bc12def6391e858af3065ae /arch/arm/boot/dts/tegra124.dtsi | |
| parent | a787f40a9a29674d1b9146b7a35e491e7a571152 (diff) | |
| download | linux-4f1d841475e1f6e9e32496dda11215db56f4ea73.tar.bz2 | |
ARM: tegra: Comment out gpio-ranges properties
While the addition of these properties is technically correct it unveils
a bug with deferred probe. The problem is that the presence of the gpio-
range property causes the gpio-tegra driver to defer probe (it needs the
pinctrl driver to be ready). That's technically correct, but it causes a
couple of issues:
- The keyboard on Chromebooks stops working. The reason for that is
that the gpio-tegra device has not registered an IRQ domain by the
time the EC SPI device is registered, hence the interrupt number
resolves to 0. This is technically a bug in the SPI core, since it
should really resolve the interrupt at probe time and defer if the
IRQ domain isn't available yet. This is similar to what's done for
I2C and platform device already.
- The gpio-tegra device deferring probe means that it is moved to the
end of the dpm_list. This list defines the suspend/resume order for
devices. However the core lacks a way to move all users of the
gpio-tegra device to the end of the dpm_list at the same time. This
in turn results in a subtle bug on Jetson TK1, where the gpio-keys
device is used to expose the power key as input. The power key is a
convenient way to wake the system from suspend. Interestingly, the
gpio-keys device ends up getting probed at a point after gpio-tegra
has been probed successfully from having been deferred earlier. As
such the driver doesn't need to defer the probe itself, and hence
the device isn't moved to the end of the dpm_list. This causes the
gpio-tegra device to be suspended before gpio-keys, which in turn
leaves gpio-keys unable to wake the system from suspend.
There are patches in the works to fix both of the above issues, but they
are too involved to make it into v4.3, so in the meantime let's fix the
regressions by commenting out the gpio-ranges properties until the fixes
have landed.
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/arm/boot/dts/tegra124.dtsi')
| -rw-r--r-- | arch/arm/boot/dts/tegra124.dtsi | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm/boot/dts/tegra124.dtsi b/arch/arm/boot/dts/tegra124.dtsi index 1e204a6de12c..819e2ae2cabe 100644 --- a/arch/arm/boot/dts/tegra124.dtsi +++ b/arch/arm/boot/dts/tegra124.dtsi @@ -258,7 +258,9 @@ gpio-controller; #interrupt-cells = <2>; interrupt-controller; + /* gpio-ranges = <&pinmux 0 0 251>; + */ }; apbdma: dma@0,60020000 { |