If we use a combination of VMODE and I2C4 for retention modes,
eventually the off idle power consumption will creep up by about
23mW, even during off mode with I2C4 always staying enabled.
Turns out this is because of erratum i531 "Extra Power Consumed
When Repeated Start Operation Mode Is Enabled on I2C Interface
Dedicated for Smart Reflex (I2C4)" as pointed out by Nishanth
Menon <nm@ti.com>.
Let's fix the issue by adding i2c_cfg_clear_mask for the bits
to clear when initializing the I2C4 adapter so we can clear
SREN bit that drives the I2C4 lines low otherwise when there
is no traffic.
Fixes: 3b8c4ebb76 ("ARM: OMAP3: Fix idle mode signaling for
Cc: stable@vger.kernel.org # v3.16+
sys_clkreq and sys_off_mode")
Cc: Kevin Hilman <khilman@kernel.org>
Cc: Tero Kristo <t-kristo@ti.com>
Reviewed-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
While debugging legacy mode vs device tree booted PM regressions,
I noticed that omap3 is not toggling sys_clkreq and sys_off_mode
pins like it should.
The sys_clkreq and sys_off_mode pins are not toggling because of
the following issues:
1. The default polarity for the sys_off_mode pin is wrong.
OFFMODE_POL needs to be cleared for sys_off_mode to go down when
hitting off-idle, while CLKREQ_POL needs to be set so sys_clkreq
goes down when hitting retention.
2. The values for voltctrl register need to be updated dynamically.
We need to set either the retention idle bits, or off idle bits
in the voltctrl register depending the idle mode we're targeting
to hit.
Let's fix these two issues as otherwise the system will just
hang if any twl4030 PMIC idle scripts are loaded. The only case
where the system does not hang is if only retention idle over I2C4
is configured by the bootloader.
Note that even without the twl4030 PMIC scripts, these fixes will
do the proper signaling of sys_clkreq and sys_off_mode pins, so
the fixes are needed to fix monitoring of PM states with LEDs or
an oscilloscope.
Cc: Kevin Hilman <khilman@linaro.org>
Cc: Nishanth Menon <nm@ti.com>
Cc: Paul Walmsley <paul@pwsan.com>
Cc: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
OMAP3 VC code now uses voltage deltas + slew rates for calculating actual
ramp times for voltage changes. Previously a static value was used.
Two calculation methods are provided: i2c_timings and off_timings.
I2C timings are used during retention or off mode transition which
is initiated over I2C, and OFF timings are used if PMIC signal
(nsleep) is used to control all the off mode voltages at the same time.
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Kevin Hilman <khilman@ti.com>
These new structs will hold the sleep voltage levels (omap_vc_params)
and voltage processor min / max voltages (omap_vp_params.) Previously
these were part of the PMIC struct, but they do not really belong there,
as they are OMAP chip specific, not PMIC specific parameters. voltdm
code is also changed to use the new structs.
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Kevin Hilman <khilman@ti.com>
Starting with OMAP5, the following registers are per-channel and not
common to a all VC channels:
- SMPS I2C slave address
- SMPS voltage register address offset
- SMPS cmd/value register address offset
- VC channel configuration register
Move these from the channel-common struct into the per-channel struct
to support OMAP5.
Signed-off-by: Kevin Hilman <khilman@ti.com>
On OMAP3+, all VC channels have the the same bitfield ordering for all
VC channels, except the OMAP4 MPU channel. This appears to be a freak
accident as all other VC channel (including OMAP5) have the standard
configuration. Handle the mutant case by adding a per-channel flag
to signal the deformity and handle it during VC init.
Special thanks to Nishanth Menon <nm@ti.com> for finding this problem
and for proposing the initial solution.
Cc: Nishanth Menon <nm@ti.com>
Signed-off-by: Kevin Hilman <khilman@ti.com>
Remove hard-coded I2C configuration in favor of settings that can be
configured from PMIC-specific values. Currently only high-speed mode
and the master-code value are supported, since they were the only
fields currently used, but extending this is now trivial.
Thanks to Nishanth Menon <nm@ti.com> for reporting/fixing a sparse
problem and making omap_vc_i2c_init() static, as well as finding and
fixing a problem with the shift/mask of mcode.
Signed-off-by: Kevin Hilman <khilman@ti.com>
Move structure containing PMIC configurable settings into struct
voltagedomain. In the process, rename from omap_volt_pmic_info to
omap_voltdm_pmic (_info suffix is not helpful.)
No functional changes.
Signed-off-by: Kevin Hilman <khilman@ti.com>
VC channel configuration is programmed based on settings coming from
the PMIC configuration.
Currently, the VC channel to PMIC mapping is a simple one-to-one
mapping. Whenever a VC channel parameter is configured (i2c slave
addres, PMIC register address, on/ret/off command), the corresponding
bits are enabled in the VC channel configuration register.
If necessary, the programmability of channel configuration settings
could be extended to board/PMIC files, however, because this patch
changes the channel configuration to be programmed based on existing
values from the PMIC settings, it may not be required.
Also note that starting with OMAP4, where there are more than 2
channels, one channel is identified as the "default" channel. When
any of the bits in the channel config for the other channels are zero,
it means to use the default channel. The OMAP4 TRM (at least through
NDA version Q) is wrong in describing which is the default channel.
The default channel on OMAP4 is MPU, not CORE as decribed in the TRM.
Signed-off-by: Kevin Hilman <khilman@ti.com>
- add setup_time field to struct omap_vc_channel (init'd from PMIC data)
- use VC/VP register access helper for read/modify/write
- move VFSM structure from omap_vdd_info into struct voltagedomain
- remove redunant _data suffix from VFSM structures and variables
- remove voltsetup_shift, use ffs() on the mask value to find the shift
Signed-off-by: Kevin Hilman <khilman@ti.com>
- support both voltage register address and command register address
for each VC channel
- add fields for voltage register address (volra) and command register
address (cmdra) to struct omap_vc_channel
- use VC/VP register access read/modify/write helper
- remove volra_shift field (use __ffs(mask) for shift value)
- I2C addresses 10-bit, change size to u16
Signed-off-by: Kevin Hilman <khilman@ti.com>
- Add an i2c_slave_address field to the omap_vc_channel
- use VC/VP read/modify/write helper instead of open-coding
- remove smps_sa_shift, use __ffs(mask) for shift value
- I2C addresses 10-bit, change size to u16
Special thanks to Shweta Gulati <shweta.gulati@ti.com> for suggesting
the use of __ffs(x) instead of ffs(x) - 1.
Signed-off-by: Kevin Hilman <khilman@ti.com>
Convert VC/VP register access to use PRM VC/VP accessor functions. In
the process, move the read/write function pointers from vdd_info into
struct voltagedomain.
No functional changes.
Additional cleanup:
- remove prm_mod field from VC/VP data structures, the PRM register
access functions know which PRM module to use.
Signed-off-by: Kevin Hilman <khilman@ti.com>
Move the VC instance struct from omap_vdd_info into struct voltagedomain.
While moving, perform some misc. renames for readability.
No functional changes.
Summary of renames:
- rename omap_vc_instance to omap_vc_channel, since there is only
one instance of the VC IP and this actually represents channels
using TRM terminology.
- rename 'vc_common' field of VC channel which led to:
s/vc->vc_common/vc->common/
- remove redundant '_data' suffix
- OMAP3: vc1 --> vc_mpu, vc2 --> vc_core
- omap_vc_bypass_scale_voltage() -> omap_vc_bypass_scale()
Signed-off-by: Kevin Hilman <khilman@ti.com>
merge
As part of the voltage layer cleanup, split out VC specific code into
a dedicated VC layer. This patch primarily just moves VC code from
voltage.c into vc.c, and adds prototypes to vc.h.
No functional changes.
For readability, each function was given a local 'vc' pointer:
struct omap_vc_instance_data *vc = voltdm->vdd->vc_data;
and a global replace of s/vdd->vc_data/vc/ was done.
Also vc_init was renamed to vc_init_channel to reflect that this is
per-VC channel initializtion.
Signed-off-by: Kevin Hilman <khilman@ti.com>
Eliminate need for global variables for the various PRM module offsets by
making them part of the VP/VC common structures
Eventually, these will likely be moved again, or more likely removed
when VP/VC code is isolated, but for now just getting rid of them as
global variabes so that the voltage domain initialization can be
cleaned up.
Signed-off-by: Kevin Hilman <khilman@ti.com>
This is a first pass at reorganizing mach-omap2/voltage.c:
- Separate almost all of the data from the code of mach-omap2/voltage.c.
The code remains in mach-omap2/voltage.c. The data goes into one
of several places, depending on what type of data it is:
- Silicon process/validation data: mach-omap2/opp*_data.c
- VC (Voltage Controller) data: mach-omap2/vc*_data.c
- VP (Voltage Processor) data: mach-omap2/vp*_data.c
- Voltage domain data: mach-omap2/voltagedomains*_data.c
The ultimate goal is for all this data to be autogenerated, the same
way we autogenerate the rest of our data.
- Separate VC and VP common data from VDD-specific VC and VP data.
- Separate common voltage.c code from SoC-specific code; reuse common code.
- Reorganize structures to avoid unnecessary memory loss due to unpacked
fields.
There is much left to be done. VC code and VP code should be separated out
into vc*.c and vp*.c files. Many fields in the existing structures are
superfluous, and should be removed. Some code in voltage.c seems to be
duplicated; that code should be moved into functions of its own. Proper
voltage domain code should be created, as was done with the powerdomain
and clockdomains, and powerdomains should reference voltagedomains.
Thanks to Shweta Gulati <shweta.gulati@ti.com> for comments. Thanks
to Rajendra Nayak <rnayak@ti.com> for finding and fixing some bugs
that prevented OMAP4 from booting:
https://patchwork.kernel.org/patch/587311/
His patch has been folded into this one to avoid breaking OMAP4
between patches. Thanks also to Kevin Hilman <khilman@ti.com> for
finding and fixing a compile problem when !CONFIG_PM:
http://www.spinics.net/lists/arm-kernel/msg118067.html
His patch has also been folded into this one to avoid breaking
!CONFIG_PM builds.
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: Shweta Gulati <shweta.gulati@ti.com>
Cc: Rajendra Nayak <rnayak@ti.com>
Cc: Kevin Hilman <khilman@ti.com>
Tony Lindgren