diff options
| author | Sudeep Holla <sudeep.holla@arm.com> | 2016-06-20 15:56:09 +0100 |
|---|---|---|
| committer | Olof Johansson <olof@lixom.net> | 2016-06-20 22:59:54 -0700 |
| commit | 8da7cc087b27c039a217c2b5b13df717bc6bbc88 (patch) | |
| tree | 697c188a81be4aea30874ecb7657bce2c68fd6f9 /arch/arm64/Kconfig.platforms | |
| parent | cfa999ef5bd2ee91ac419b4de2aca24d3a5d35ac (diff) | |
arm64: Kconfig: select PM{,_GENERIC_DOMAINS} for ARCH_VEXPRESS
The Linux AMBA bus framework probes the peripheral IDs when adding the
AMBA devices very early on the boot. Generally they are on APB bus and
just require APB clocks to be on even when most of the core logic of the
IP is powered down.
However on Juno, the entire debugsys domain needs to be ON to access
even the coresight components' CID/PID registers and hence broken by
design. Accessing those while debugsys power domain is off will lead to
the bridge stalling the transactions instead of returning the slave error.
Further, the AMBA framework can't deal with !CONFIG_PM_GENERIC_DOMAINS
case: it ignores the error and proceeds to access the device region.
It was suggested to always enable CONFIG_PM{,_GENERIC_DOMAINS} in order
to handle above explained scenario.
Cc: Arnd Bergmann <arnd@arndb.de>
Suggested-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
Diffstat (limited to 'arch/arm64/Kconfig.platforms')
| -rw-r--r-- | arch/arm64/Kconfig.platforms | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm64/Kconfig.platforms b/arch/arm64/Kconfig.platforms index f5e7db6d6b2e..89712f71ef26 100644 --- a/arch/arm64/Kconfig.platforms +++ b/arch/arm64/Kconfig.platforms @@ -163,6 +163,8 @@ config ARCH_VEXPRESS bool "ARMv8 software model (Versatile Express)" select ARCH_REQUIRE_GPIOLIB select COMMON_CLK_VERSATILE + select PM + select PM_GENERIC_DOMAINS select POWER_RESET_VEXPRESS select VEXPRESS_CONFIG help |