Messages in this thread Patch in this message | | | From | Dmitry Baryshkov <> | Date | Fri, 1 Oct 2021 03:12:55 +0300 | Subject | Re: [PATCH] arm64: defconfig: Disable firmware sysfs fallback |
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On Fri, 1 Oct 2021 at 00:51, Bjorn Andersson <bjorn.andersson@linaro.org> wrote: > > Part of the enablement of SDMA on the IMX platforms, '7f4e4afa140c > ("arm64: defconfig: Enable SDMA on i.mx8mq/8mm")' also enabled > CONFIG_FW_LOADER_USER_HELPER_FALLBACK, to allow "firmware loaded by > udev". > > Unfortunately having the fallback enabled does, due to the 60 second > timeout, essentially requiring userspace to provide a firmware loader. > But systemd dropped the support for this interface back in 2014 and > because arm64 is the only architecture that has this enabled, there > doesn't seem to be any standard solution available.
I tend to use the following 'standard' solution:
cat /lib/udev/rules.d/50-firmware.rules # stub for immediately telling the kernel that userspace firmware loading # failed; necessary to avoid long timeouts with CONFIG_FW_LOADER_USER_HELPER=y SUBSYSTEM=="firmware", ACTION=="add", ATTR{loading}="-1"
> Examples of this problem can be found in e.g. the ath10k driver, which > with a standard distro can take about 10 minutes before wlan0 appears. > > The alternative to this patch would be to change these drivers to use > firmware_request_direct(), to avoid the sysfs fallback. But that would > prevent other systems, such as Android, to rely on a userspace firmware > loader to pick the firmware from a non-standard place, with just a > custom defconfig. > > This patch therefor attempts to align the arm64 defconfig will all other > architectures in the upstream kernel. > > Cc: Robin Gong <yibin.gong@nxp.com> > Cc: Shawn Guo <shawnguo@kernel.org> > Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> --- > arch/arm64/configs/defconfig | 1 - > 1 file changed, 1 deletion(-) > > diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig > index da988a54bfb9..f9e0b3fdaf0b 100644 > --- a/arch/arm64/configs/defconfig > +++ b/arch/arm64/configs/defconfig > @@ -243,7 +243,6 @@ CONFIG_PCI_EPF_TEST=m > CONFIG_DEVTMPFS=y > CONFIG_DEVTMPFS_MOUNT=y > CONFIG_FW_LOADER_USER_HELPER=y > -CONFIG_FW_LOADER_USER_HELPER_FALLBACK=y > CONFIG_HISILICON_LPC=y > CONFIG_SIMPLE_PM_BUS=y > CONFIG_FSL_MC_BUS=y > -- > 2.29.2 >
-- With best wishes Dmitry
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