[ Upstream commit 1e434b7032 ]
The sw2iso count should cover ARM LDO ramp-up time,
the MAX ARM LDO ramp-up time may be up to more than
100us on some boards, this patch sets sw2iso to 0xf
(~384us) which is the reset value, and it is much
more safe to cover different boards, since we have
observed that some customer boards failed with current
setting of 0x2.
Fixes: 05136f0897 ("ARM: imx: support arm power off in cpuidle for i.mx6sx")
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Support using PSCI to handle Power stuff.
Use PSCI to differentiate secure/non-secure kernel.
i.MX7 LPSR mode not implemented now.
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Anson Huang <Anson.Huang@nxp.com>
When a cpuidle driver is called it can choose to enter a different state
that what was asked from above. When this happens it should return the
actual entered_state index for proper accounting.
This fixes the various imx cpuidle drivers which depend on low busfreq
for LOW-POWER-IDLE to correctly report that they entered WAIT instead.
Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
Enable low power idle for i.MX6SX:
WFI -> first level idle;
WAIT mode -> second level idle;
Low power idle -> third level idle, only when system is in low bus mode.
In low powe idle mode, below operations will be done:
ARM power off;
AHB freq lower to 3MHz;
PERCLK freq lower to 6MHz;
MMDC freq lower to 1MHz;
Anatop will be put into low power mode, and regular band-gap will
be off and low power band-gap will be enabled instead.
Also, in low power idle mode, 24MHz XTAL power will be off and 24MHz clk
source will be switched to RC-OSC to save power, this feature is only
enabled on i.MX6SX TO1.2.
This patch is cherry-picked from L3.14.y, it is the latest version, below
conflicts are fixed.
Signed-off-by: Anson Huang <b20788@freescale.com>
Conflicts:
arch/arm/mach-imx/Makefile
arch/arm/mach-imx/common.h
arch/arm/mach-imx/cpuidle-imx6sx.c
arch/arm/mach-imx/cpuidle.h
arch/arm/mach-imx/mach-imx6sx.c
arch/arm/mach-imx/pm-imx6.c
This patch enables cpuidle driver for i.MX6UL, it
reuses i.MX6SX's cpuidle driver, 3 levels of cpuidle
supported:
1. ARM WFI;
2. SOC in WAIT mode;
3. SOC in WAIT mode + ARM power off.
As i.MX6UL has cortex-A7 CORE with an internal L2
cache, so flushing it before powering down ARM platform
is necessary, flush_cache_all() in last step of cpu_suspend
has very small overhead, just call it to avoid cache
type check for different platforms.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Need to enable INT_MEM_CLK_LPM bit in CCM_CGPR for WAIT mode,
without this bit set, if there is pending interrupt during
ARM platform entering WAIT mode without power gating, cache
data will be corrupted, this is a hardware workaround for WAIT
mode and must be enabled.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Rather than setting initial low-power mode in every single i.MX6 clock
initialization function, we should really do that in pm code. Let's
move imx6q_set_lpm(WAIT_CLOCKED) call into imx6_pm_common_init().
While at it, let's rename the function to imx6_set_lpm() since it's
actually common for all i.MX6 SoCs.
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
The cpu_do_idle() function is always used by the cpuidle drivers.
That led to have each driver including cpuidle.h and proc-fns.h, they are
always paired. That makes a lot of duplicate headers inclusion. Instead of
including both in each .c file, move the proc-fns.h header inclusion in the
cpuidle.h header file directly, so we can save some line of code.
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Kevin Hilman <khilman@linaro.org>
Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Tested-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
As the result of commit b82b6cca48 ("cpuidle: Invert
CPUIDLE_FLAG_TIME_VALID logic"), the flag gets removed and hence we see
the compile error below.
CC arch/arm/mach-imx/cpuidle-imx6sx.o
arch/arm/mach-imx/cpuidle-imx6sx.c:69:13: error: ‘CPUIDLE_FLAG_TIME_VALID’ undeclared here (not in a function)
Since the behavior of the original flag has been the default, we can
simply drop the flag now.
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
This patch introduces an independent cpuidle driver for
i.MX6SX, and supports arm power off in idle, totally
3 levels of cpuidle are supported as below:
1. ARM WFI;
2. SOC in WAIT mode;
3. SOC in WAIT mode + ARM power off.
ARM power off can save at least 5mW power.
This patch also replaces imx6q_enable_rbc with imx6_enable_rbc.
Signed-off-by: Anson Huang <b20788@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Marcel Ziswiler