Allow a user to read PWM capture results from sysfs. To start a capture
and read the result, simply read the file:
$ cat $PWMCHIP/capture
The output format is "<period> <duty cycle>".
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
(cherry picked from commit 1a366fe915)
Change-Id: I86326709c373630a9189232a1cf2804a1a6ed380
Signed-off-by: David Wu <david.wu@rock-chips.com>
Supply a PWM capture callback op in order to pass back information
obtained by running analysis on a PWM signal. This would normally (at
least during testing) be called from the sysfs routines with a view to
printing out PWM capture data which has been encoded into a string.
Signed-off-by: Lee Jones <lee.jones@linaro.org>
[thierry.reding@gmail.com: make capture data unsigned int for symmetry]
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
(cherry picked from commit 3a3d1a4e32)
Change-Id: Iee3acf2eb02c5282d586f4e7f1745031e17cc383
Signed-off-by: David Wu <david.wu@rock-chips.com>
This patch adds to check the return value from pwm_apply_state()
used in enable_store(). The error of enable_store() doesn't work
if the return value doesn't received.
Signed-off-by: Ryo Kodama <ryo.kodama.vz@renesas.com>
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Fixes: 39100ceea7 ("pwm: Switch to the atomic API")
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
(cherry picked from commit fe5aa34d6e)
Change-Id: I550da28345bcee7a6aa8e1f9b5c43adae923ff2d
Signed-off-by: David Wu <david.wu@rock-chips.com>
It seems like in the process of refactoring pwm_config() to utilize the
newly-introduced pwm_apply_state() API, some args/bounds checking was
dropped.
In particular, I noted that we are now allowing invalid period
selections, e.g.:
# echo 1 > /sys/class/pwm/pwmchip0/export
# cat /sys/class/pwm/pwmchip0/pwm1/period
100
# echo 101 > /sys/class/pwm/pwmchip0/pwm1/duty_cycle
[... driver may or may not reject the value, or trigger some logic bug ...]
It's better to see:
# echo 1 > /sys/class/pwm/pwmchip0/export
# cat /sys/class/pwm/pwmchip0/pwm1/period
100
# echo 101 > /sys/class/pwm/pwmchip0/pwm1/duty_cycle
-bash: echo: write error: Invalid argument
This patch reintroduces some bounds checks in both pwm_config() (for its
signed parameters; we don't want to convert negative values into large
unsigned values) and in pwm_apply_state() (which fix the above described
behavior, as well as other potential API misuses).
Fixes: 5ec803edcb ("pwm: Add core infrastructure to allow atomic updates")
Signed-off-by: Brian Norris <briannorris@chromium.org>
Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
(cherry picked from commit ef2bf4997f)
Change-Id: I7d7515a51b5c3c2a77ae9743b7ed69eedc11d4b4
Signed-off-by: David Wu <david.wu@rock-chips.com>
Now that the PWM regulator driver implements the ->enable/disable() hooks
we can remove the pwm_enable() call from pwm_regulator_set_voltage().
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
(cherry picked from commit 830583004e)
Change-Id: I89fba9a44d98ed94ede099b841b7358ba4011e35
Signed-off-by: David Wu <david.wu@rock-chips.com>
The PWM states make it possible to also output the polarity, duty cycle
and period information in the debugfs summary output. This simplifies
gathering information about PWMs without needing to walk through the
sysfs attributes of every PWM.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
[thierry.reding@gmail.com: use more spaces in debugfs output]
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
(cherry picked from commit 23e3523f5d)
Change-Id: Ia5d4d9ab898510d07364ad455ccf93e1c1d95d2b
Signed-off-by: David Wu <david.wu@rock-chips.com>
Add an ->apply() method to the pwm_ops struct to allow PWM drivers to
implement atomic updates. This method is preferred over the ->enable(),
->disable() and ->config() methods if available.
Add the pwm_apply_state() function to the PWM user API.
Note that the pwm_apply_state() does not guarantee the atomicity of the
update operation, it all depends on the availability and implementation
of the ->apply() method.
pwm_enable/disable/set_polarity/config() are now implemented as wrappers
around the pwm_apply_state() function.
pwm_adjust_config() is allowing smooth handover between the bootloader
and the kernel. This function tries to adapt the current PWM state to
the PWM arguments coming from a PWM lookup table or a DT definition
without changing the duty_cycle/period proportion.
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
[thierry.reding@gmail.com: fix a couple of typos]
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
(cherry picked from commit 5ec803edcb)
Change-Id: Ib527f34ca3ce90ded3b48725d7ab9509de2053c9
Signed-off-by: David Wu <david.wu@rock-chips.com>
Add a ->get_state() function to the pwm_ops struct to let PWM drivers
initialize the PWM state attached to a PWM device.
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
(cherry picked from commit 15fa8a43c1)
Change-Id: Ie37be2d34833cbb6cc4b4b4cb6af98ac721b953a
Signed-off-by: David Wu <david.wu@rock-chips.com>
Prepare the transition to PWM atomic update by moving the enabled and
disabled state into the pwm_state struct. This way we can easily update
the whole PWM state by copying the new state in the ->state field.
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
(cherry picked from commit 09a7e4a3d9)
Change-Id: I38808d868c7e73f0ffd49cfb6c0b4b45fa911613
Signed-off-by: David Wu <david.wu@rock-chips.com>
The PWM state, represented by its period, duty_cycle and polarity is
currently directly stored in the PWM device. Declare a pwm_state
structure embedding those field so that we can later use this struct
to atomically update all the PWM parameters at once.
All pwm_get_xxx() helpers are now implemented as wrappers around
pwm_get_state().
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
(cherry picked from commit 43a276b003)
Change-Id: I44037440bcc9d9164d18f3bfa1c8ff3e593925c5
Signed-off-by: David Wu <david.wu@rock-chips.com>
Before the introduction of pwm_args, the core was resetting the PWM
period and polarity states to the reference values (those provided
through the DT, a PWM lookup table or hardcoded in the driver).
Now that all PWM users are correctly using pwm_args to configure their
PWM device, we can safely remove the pwm_apply_args() call in pwm_get()
and of_pwm_get().
We can also get rid of the pwm_set_period() call in pwm_apply_args(),
because PWM users are now directly using pargs->period instead of
pwm_get_period(). By doing that we avoid messing with the current PWM
period.
The only remaining bit in pwm_apply_args() is the initial polarity
setting, and it should go away when all PWM users have been patched to
use the atomic API (with this API the polarity will be set along with
other PWM arguments when configuring the PWM).
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
(cherry picked from commit a8c3862551)
Change-Id: I5112f2d8a7b66e01184984376dcae84decf5ad28
Signed-off-by: David Wu <david.wu@rock-chips.com>
The PWM framework has clarified the concept of reference PWM config (the
platform dependent config retrieved from the DT or the PWM lookup table)
and real PWM state.
Use pwm_get_args() when the PWM user wants to retrieve this reference
config and not the current state.
This is part of the rework allowing the PWM framework to support
hardware readout and expose real PWM state even when the PWM has just
been requested (before the user calls pwm_config/enable/disable()).
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
(cherry picked from commit 6cb9644db7)
Change-Id: Idc29a17716d439962b50db156c13b65abd852d90
Signed-off-by: David Wu <david.wu@rock-chips.com>
The PWM framework has clarified the concept of reference PWM config (the
platform dependent config retrieved from the DT or the PWM lookup table)
and real PWM state.
Use pwm_get_args() when the PWM user wants to retrieve this reference
config and not the current state.
This is part of the rework allowing the PWM framework to support
hardware readout and expose real PWM state even when the PWM has just
been requested (before the user calls pwm_config/enable/disable()).
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
(cherry picked from 8c12ad8e91)
Conflicts:
drivers/regulator/pwm-regulator.c
Change-Id: Id7fb1d823db7a0be207de4f0393e6c86df143335
Signed-off-by: David Wu <david.wu@rock-chips.com>
PWM devices are not protected against concurrent accesses. The lock in
struct pwm_device might let PWM users think it is, but it's actually
only protecting the enabled state.
Removing this lock should be fine as long as all PWM users are aware
that accesses to the PWM device have to be serialized, which seems to be
the case for all of them except the sysfs interface. Patch the sysfs
code by adding a lock to the pwm_export struct and making sure it's
taken for all relevant accesses to the exported PWM device.
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
(cherry picked from commit 459a25afe9)
Change-Id: I30d97ebaf1db8b80c353da5ebebd0fc5d5c57bb0
Signed-off-by: David Wu <david.wu@rock-chips.com>
The PWM period will be set when calling pwm_config. Remove this useless
call to pwm_set_period(), which might mess up the internal PWM state.
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
(cherry picked from commit 7f044b09b6)
Change-Id: I6eecc6cd8e9dbe5929bdc016433772a721711928
Signed-off-by: David Wu <david.wu@rock-chips.com>
pwm_apply_args() is supposed to initialize a PWM device according to the
arguments provided by the DT or the PWM lookup, but this function was
called inside pwm_device_request(), which in turn was called before the
core had a chance to initialize the pwm->args fields.
Fix that by calling pwm_apply_args directly in pwm_get() and of_pwm_get()
after initializing pwm->args field.
This commit also fixes an invalid pointer dereference introduced by
commit e39c0df1be ("pwm: Introduce the pwm_args concept").
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Fixes: e39c0df1be ("pwm: Introduce the pwm_args concept")
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
(cherry picked from commit fbd45a1298)
Change-Id: I9746f4ada57a6cc8155bafe662a63c82338c223a
Signed-off-by: David Wu <david.wu@rock-chips.com>
Since we will need the backlight_device_get_by_type API, we can use it
instead of the backlight_device_registered API whenever necessary so
remove the backlight_device_registered API.
Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Acked-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
(cherry picked from commit 01c3664de6)
Change-Id: I12fdee74963c2cbc5b950019598ec218de1b7b5d
Signed-off-by: David Wu <david.wu@rock-chips.com>
It is useful to get the backlight device's pointer and use it to set
backlight in some cases(the following patch will make use of it) so add
the two APIs and export them.
Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Acked-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
(cherry picked from commit f6a4790a54)
Change-Id: Ia7d06bf600f86ae25939b830e49f5057f48f992d
Signed-off-by: David Wu <david.wu@rock-chips.com>
If pwm is requested by legacy pwm_request() and if the following
backlight_device_register() call fails, add pwm_free() clean-up.
Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
(cherry picked from commit 60d613d6ae)
Change-Id: I7fc9742e69aacbe3f7cef1c56bbd35b4ca72720e
Signed-off-by: David Wu <david.wu@rock-chips.com>
Commit ee65ad0e2a9e ("backlight: pwm_bl: Avoid backlight flicker when
probed from DT") tries to dereference the device of_node pointer
unconditionally, causing a NULL pointer dereference on non-dt platforms.
Fix it by replacing the phandle variable with a node variable and
by checking that for NULL before dereferencing it.
Reported-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Acked-by: Thierry Reding <thierry.reding@gmail.com>
Tested-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
(cherry picked from commit 8777078015)
Change-Id: If98d57968b7ae64164ae4d5995c8bf3007a35c0c
Signed-off-by: David Wu <david.wu@rock-chips.com>
If the driver is probed from the device tree, and there is a phandle
property set on it, and the enable GPIO is already configured as output,
and the backlight is currently disabled, keep it disabled.
If all these conditions are met, assume there will be some other driver
that can enable the backlight at the appropriate time.
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
(cherry picked from commit 3698d7e7d2)
Change-Id: I76012aae7f546b0189c879283988d7c098f23410
Signed-off-by: David Wu <david.wu@rock-chips.com>
kcalloc() should be preferred for allocations of arrays over kzalloc()
with multiplication.
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
(cherry picked from commit 2907f8abb7)
Change-Id: Ifa4619bcd5c0869e516ae7765bab7515b299c533
Signed-off-by: David Wu <david.wu@rock-chips.com>
checkpatch requires that declarations be separated from code by a blank
line. Add one for readability and to silence the warning.
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
(cherry picked from commit 83a98864ff)
Change-Id: I1e59599b099fe6b4d29e0f39225f8e18ce7c139e
Signed-off-by: David Wu <david.wu@rock-chips.com>
Currently the PWM core mixes the current PWM state with the per-platform
reference config (specified through the PWM lookup table, DT definition
or directly hardcoded in PWM drivers).
Create a struct pwm_args to store this reference configuration, so that
PWM users can differentiate between the current and reference
configurations.
Patch all places where pwm->args should be initialized. We keep the
pwm_set_polarity/period() calls until all PWM users are patched to use
pwm_args instead of pwm_get_period/polarity().
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
[thierry.reding@gmail.com: reword kerneldoc comments]
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
(cherry picked from commit e39c0df1be)
Change-Id: Id9ec0898d92d7049813c32acbd909103e949c846
Signed-off-by: David Wu <david.wu@rock-chips.com>
The call to set_machine_constraints() in regulator_register(), will
attempt to get the voltage for the regulator. If a regulator is in
bypass will fail to get the voltage (ie. it's bypass voltage) and
hence register the regulator, because the supply for the regulator has
not been resolved yet.
To fix this, add a call to regulator_resolve_supply() before we call
set_machine_constraints(). If the call to regulator_resolve_supply()
fails, rather than returning an error at this point, allow the
registration of the regulator to continue because for some regulators
resolving the supply at this point may not be necessary and it will be
resolved later as more regulators are added. Furthermore, if the supply
is still not resolved for a bypassed regulator, this will be detected
when we attempt to get the voltage for the regulator and an error will
be propagated at this point.
If a bypassed regulator does not have a supply when we attempt to get
the voltage, rather than returing -EINVAL, return -EPROBE_DEFER instead
to allow the registration of the regulator to be deferred and tried
again later.
Please note that regulator_resolve_supply() will call
regulator_dev_lookup() which may acquire the regulator_list_mutex. To
avoid any deadlocks we cannot hold the regulator_list_mutex when calling
regulator_resolve_supply(). Therefore, rather than holding the lock
around a large portion of the registration code, just hold the lock when
aquiring any GPIOs and setting up supplies because these sections may
add entries to the regulator_map_list and regulator_ena_gpio_list,
respectively.
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
(cherry picked from commit 45389c4752)
Change-Id: I9a0fa34c92b3326b9563672b74b5651cfd3a96f8
Signed-off-by: David Wu <david.wu@rock-chips.com>
To make the code more compat and centralized, this patch add a
unified function - regulator_ops_is_valid. So we can add
some extra checking code easily later.
Signed-off-by: WEN Pingbo <pingbo.wen@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
(cherry picked from commit 8a34e979f6)
Change-Id: Ib3ffc949004c71abe3b75b4e0ffaf2e303f00d22
Signed-off-by: David Wu <david.wu@rock-chips.com>
When checking bypass state for a regulator, we check to see if any bits
in the bypass mask are set. For most cases this is fine because there is
typically, only a single bit used to determine if the regulator is in
bypass. However, for some regulators, such as LDO6 on AS3722, the bypass
state is indicate by a value rather than a single bit. Therefore, when
checking the bypass state, check that the bypass field matches the ON
value.
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
(cherry picked from commit dd1a571dae)
Change-Id: Ic9f9ee919969cc744be7e7c94729ee7ab9e0e7a1
Signed-off-by: David Wu <david.wu@rock-chips.com>
The public functions to acquire a regulator, such as regulator_get(),
internally look-up the regulator from the list of regulators that have
been registered with the regulator device class. The registration of
a new regulator with the regulator device class happens before the
regulator has been completely setup. Therefore, it is possible that
the regulator could be acquired before it has been setup successfully.
To avoid this move the device registration of the regulator to the end
of the regulator setup and update the error exit path accordingly.
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
(cherry picked from commit c438b9d017)
Change-Id: I9b33820c1ea748fdf5ccfb8949775b753af4a848
Signed-off-by: David Wu <david.wu@rock-chips.com>
During the resolution of a regulator's supply, we may attempt to enable
the supply if the regulator itself is already enabled. If enabling the
supply fails, then we will call _regulator_put() for the supply.
However, the pointer to the supply has not been cleared for the
regulator and this will cause a crash if we then unregister the
regulator and attempt to call regulator_put() a second time for the
supply. Fix this by clearing the supply pointer if enabling the supply
after fails when resolving the supply for a regulator.
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
(cherry picked from commit 8e5356a736)
Change-Id: I3e83852db8c624fdd5b6c0bcab42c07289501a58
Signed-off-by: David Wu <david.wu@rock-chips.com>
The function regulator_register_resolve_supply() is called from the
context of class_for_each_dev() (during the regulator registration) to
resolve any supplies added. regulator_register_resolve_supply() will
return an error if a regulator's supply cannot be resolved and this will
terminate the loop in class_for_each_dev(). This means that we will not
attempt to resolve any other supplies after one has failed. Hence, this
may delay the resolution of other regulator supplies until the failing
one itself can be resolved.
Rather than terminating the loop early, don't return an error code and
keep attempting to resolve any other supplies for regulators that have
been registered.
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
(cherry picked from commit 7ddede6a58)
Change-Id: I92644a3c2006476440f0eeca2e4a9717743b13b9
Signed-off-by: David Wu <david.wu@rock-chips.com>
There are debugfs entries for voltage and current, but not for
the constraint flags. It's useful for debugging to be able to
see what these flags are so this patch adds a new debugfs file.
We can't use debugfs_create_bool for this because the flags are
bitfields, so as this needs a special read callback they have been
collected into a single file that lists all the flags.
Signed-off-by: Richard Fitzgerald <rf@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
(cherry picked from commit 2d80a91b2f)
Change-Id: Ia3e78960204e34e004340e28b3a7f933aa457371
Signed-off-by: David Wu <david.wu@rock-chips.com>
When we acquire a shareable enable GPIO on probe we do so with the
regulator_list_mutex held. However when we release the GPIOs we do this
immediately after dropping the mutex meaning that the list could become
corrupted. Move the release into the locked region to avoid this.
Signed-off-by: Mark Brown <broonie@kernel.org>
(cherry picked from commit 2c0a303a12)
Change-Id: I27a96e1b5ff3034fa068bda5436a479e01e5a61b
Signed-off-by: David Wu <david.wu@rock-chips.com>
device_register() is calling ->get_voltage() as part of it's sysfs attribute
initialization process, and this functions might need to know the regulator
constraints to return a valid value.
This is at least true for the pwm regulator driver (when operating in
continuous mode) which needs to know the minimum and maximum voltage values
to calculate the current voltage:
min_uV + (((max_uV - min_uV) * dutycycle) / 100);
Move device_register() after set_machine_constraints() to make sure those
constraints are correctly initialized when ->get_voltage() is called.
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Reported-by: Stephen Barber <smbarber@chromium.org>
Tested-by: Caesar Wang <wxt@rock-chips.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
(cherry picked from commit 469b640e4f)
Change-Id: I83c95e5baef0501876d19f1e2e7a7e3af8631b1f
Signed-off-by: David Wu <david.wu@rock-chips.com>
When a regulator is in bypass mode it is functioning as a switch
returning the voltage set in the regulator will not give the voltage
being output by the regulator as it's just passing through its supply.
This means that when we are getting the voltage from a regulator we
should check to see if it is in bypass mode and if it is we should
report the voltage from the supply rather than that which is set on the
regulator.
Reported-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
[treding@nvidia.com: return early for bypass mode]
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
(cherry picked from commit fef9501901)
Change-Id: I889789bce3018bec24ba9a0476217c0573ce9a27
Signed-off-by: David Wu <david.wu@rock-chips.com>
In continuous mode of the PWM regulators, the requested voltage
PWM duty cycle is calculated in terms of 100% scale where entire
range denotes 100%. The calculation for PWM pulse ON time(duty_pulse)
is done as:
duty_cycle = ((requested - minimum) * 100) / voltage_range.
then duty pulse is calculated as
duty_pulse = (pwm_period/100) * duty_cycle
This leads to the calculation error if we have the requested voltage
where accurate pulse time is possible.
For example: Consider following case
voltage range is 800000uV to 1350000uV.
pwm-period = 1550ns (1ns time is 1mV).
Requested 900000uV.
duty_cycle = ((900000uV - 800000uV) * 100)/ 1550000
= 6.45 but we will get 6.
duty_pulse = (1550/100) * 6 = 90 pulse time.
90 pulse time is equivalent to 90mV and this gives us pulse time equivalent
to 890000uV instead of 900000uV.
Proposing the solution in which if requested voltage makes the accurate
duty pulse then there will not be any error. On this case, if
(req_uV - min_uV) * pwm_period is perfect dividable by voltage_range
then get the duty pulse time directly.
duty_pulse = ((900000uV - 800000uV) * 1550)/1550000)
= 100
and this is equivalent to 100mV and so final voltage is
(800000 + 100000) = 900000uV which is same as requested,
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
(cherry picked from commit fd786fb027)
Change-Id: I08b54da55b29be7f8cbf4c837bc2e2d993ebf9a0
Signed-off-by: David Wu <david.wu@rock-chips.com>
Commit 5e3ca2b349 ("regulator: Try to resolve regulators supplies on
registration") added a call to regulator_resolve_supply() within
regulator_register() where the regulator_list_mutex is held. This causes
a deadlock to occur on the Tegra114 Dalmore board when the palmas PMIC
is registered because regulator_register_resolve_supply() calls
regulator_dev_lookup() which may try to acquire the regulator_list_mutex
again.
Fix this by releasing the mutex before calling
regulator_register_resolve_supply() and update the error exit path to
ensure the mutex is released on an error.
[Made commit message more legible -- broonie]
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
(cherry picked from commit a215137423)
Change-Id: I65ac4aeac254d2ef3f161c422b92defd5badbbc4
Signed-off-by: David Wu <david.wu@rock-chips.com>
Flagging voltage changes as possible for exactly specified voltages
appears to be triggering bugs in the SDHCI code (it should be able to
handle the case where only one voltage it wants is in the range it is
allowed to set) so make sure we only set the flag in cases where there's
genuine variability.
Signed-off-by: Mark Brown <broonie@kernel.org>
(cherry picked from commit 45fa2038cf)
Change-Id: I68c5c8fd3ca2da2ddb07af125f57158441040af3
Signed-off-by: David Wu <david.wu@rock-chips.com>
This aids in debugging problems triggered by the regulator core applying
its constraints, we could potentially crash immediately after updating
the voltage if the constraints are buggy.
Signed-off-by: Mark Brown <broonie@kernel.org>
(cherry picked from commit 45a91e8f76)
Change-Id: I8c3e4a856f05c13e6ce3db8a6d46686557109962
Signed-off-by: David Wu <david.wu@rock-chips.com>
Commit 6261b06de5 ("regulator: Defer lookup of supply to regulator_get")
moved the regulator supplies lookup logic from the regulators registration
to the regulators get time.
Unfortunately, that changed the behavior of the regulator core since now a
parent supply with a child regulator marked as always-on, won't be enabled
unless a client driver attempts to get the child regulator during boot.
This patch tries to resolve the parent supply for the already registered
regulators each time that a new regulator is registered. So the regulators
that have child regulators marked as always on will be enabled regardless
if a driver gets the child regulator or not.
That was the behavior before the mentioned commit, since parent supplies
were looked up at regulator registration time instead of during child get.
Since regulator_resolve_supply() checks for rdev->supply, most of the times
it will be a no-op. Errors aren't checked to keep the possible out of order
dependencies which was the motivation for the mentioned commit.
Also, the supply being available will be enforced on regulator get anyways
in case the resolve fails on regulators registration.
Fixes: 6261b06de5 ("regulator: Defer lookup of supply to regulator_get")
Suggested-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: <stable@vger.kernel.org> # 4.1+
(cherry picked from commit 5e3ca2b349)
Change-Id: I0e1530a985002c915d7a8e04f56b7f2e1acb60c7
Signed-off-by: David Wu <david.wu@rock-chips.com>
Currently we only attempt to set the voltage during constraints
application if an exact voltage is specified. Extend this so that if
the currently set voltage for the regulator is outside the bounds set in
constraints we will move the voltage to the nearest constraint, raising
to the minimum or lowering to the maximum as needed. This ensures that
drivers can probe without the hardware being driven out of spec.
Reported-by: Ivaylo Dimitrov <ivo.g.dimitrov.75@gmail.com>
Tested-by: Ivaylo Dimitrov <ivo.g.dimitrov.75@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
(cherry picked from commit fa93fd4ecc)
Change-Id: I3e3e60f2f93e971364a74f9735c362acaa59f512
Signed-off-by: David Wu <david.wu@rock-chips.com>
Apparently due to a wrongly resolved merge conflict between two
branches, which contained the same commit, the commit contents
partially was added two times in a row.
This change reverts the latter wrong inclusion of commit 909f7ee0b5
("regulator: core: Add support for active-discharge configuration").
The first applied commit 670666b9e0 ("regulator: core: Add support
for active-discharge configuration") is not touched.
Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>
Cc: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
(cherry picked from commit e437b90026)
Change-Id: Iaa7a0c0bb6b7cad7c33e02ac9d90c8e098ad8c18
Signed-off-by: David Wu <david.wu@rock-chips.com>
Allow the core to always use the voltage constraints to set the voltage
on startup. A forthcoming change in that code will ensure that we bring
out of constraints voltages into spec with this setting.
Signed-off-by: Mark Brown <broonie@kernel.org>
(cherry picked from commit 895fe2321e)
Change-Id: I62f44ce1d8a2649a855ef93d9ec551b78ee4b40b
Signed-off-by: David Wu <david.wu@rock-chips.com>
The regulator_resolve_supply() function checks if a supply has been
associated with a regulator to avoid enabling it if that is not the
case.
But the supply was already looked up with regulator_resolve_supply()
and set with set_supply() before the check and both return on error.
So the fact that this statement has been reached means that neither
of them failed and a supply must be associated with the regulator.
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
(cherry picked from commit 95a293c7ba)
Change-Id: Ib4738ae3f733256a2ba794543430ffde2c434352
Signed-off-by: David Wu <david.wu@rock-chips.com>
Prints the error number along with error message when any
error occurs. This help on getting the reason of failure
quickly from log without any code instrument.
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Cc: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
(cherry picked from commit 5bf59bd5e9)
Change-Id: If370a4b4b44064ef978bd3b0b6d172e0259a5843
Signed-off-by: David Wu <david.wu@rock-chips.com>
Some of platforms like Nvidia's Tegra210 Jetson-TX1 platform has
multiple PMW based regulators. Add support to have multiple instances
of the driver by not changing any global data of pwm regulator and
if required, making instance specific copy and then making changes.
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
(cherry picked from commit f907a0a949)
Change-Id: Iafd9b033cd67a76a430024840f70e275a6d22e0d
Signed-off-by: David Wu <david.wu@rock-chips.com>
With following equation for calculating
voltage_to_duty_cycle_percentage
100 - (((req_uV * 100) - (min_uV * 100)) / diff);
we get 0% for max_uV and 100% for min_uV.
Correcting this to
((req_uV * 100) - (min_uV * 100)) / diff;
to get proper duty cycle.
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
(cherry picked from commit 1aaab34878)
Change-Id: I61d88577ece2d7bec3e9ea6c863c101c65892271
Signed-off-by: David Wu <david.wu@rock-chips.com>
OF interface provides to read the u32 value via standard interface
of_property_read_u32(). Use this API to read "regulator-min-microvolts"
and "regulator-max-microvolt".
This will make consistent with other property value reads.
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
(cherry picked from commit a34785f10d)
Change-Id: I12da714ca47197932e693567e34927a7ddd26f01
Signed-off-by: David Wu <david.wu@rock-chips.com>
Add support to enable/disable active discharge of regulator via
machine constraints. This configuration is done when setting
machine constraint during regulator register and if regulator
driver implemented the callback ops.
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
(cherry picked from commit 909f7ee0b5)
Change-Id: I9b989b8b88e9d8e765a6cefb1a189c86e7c87dbe
Signed-off-by: David Wu <david.wu@rock-chips.com>
