linux/drivers/acpi/pmic
Hans de Goede fd080a01ec ACPI / PMIC: XPower: optimize MIPI PMIQ sequence I2C-bus accesses
The I2C-bus to the XPower AXP288 is shared between the Linux kernel and
the SoCs P-Unit. The P-Unit has a semaphore which the kernel must "lock"
before it may use the bus and while the kernel holds the semaphore the CPU
and GPU power-states must not be changed otherwise the system will freeze.

This is a complex process, which is quite expensive. This is all done by
iosf_mbi_block_punit_i2c_access(). To ensure that no unguarded I2C-bus
accesses happen, iosf_mbi_block_punit_i2c_access() gets called by the
I2C-bus-driver for every I2C transfer. Because this is so expensive it
is allowed to call iosf_mbi_block_punit_i2c_access() in a nested
fashion, so that higher-level code which does multiple I2C-transfers can
call it once for a group of transfers, turning the calls done by the
I2C-bus-driver into no-ops.

The default exec_mipi_pmic_seq_element implementation from
drivers/acpi/pmic/intel_pmic.c does a regmap_update_bits() call and
the involved registers are typically marked as volatile in the regmap,
so this leads to 2 I2C-bus accesses.

Add a XPower AXP288 specific implementation of exec_mipi_pmic_seq_element
which calls iosf_mbi_block_punit_i2c_access() calls before the
regmap_update_bits() call to avoid having to do the whole expensive
acquire P-Unit semaphore dance twice.

Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2021-07-16 19:05:59 +02:00
..
intel_pmic_bxtwc.c
intel_pmic_bytcrc.c
intel_pmic_chtcrc.c ACPI: fix various typos in comments 2021-03-19 17:45:49 +01:00
intel_pmic_chtdc_ti.c ACPI: scan: Extend acpi_walk_dep_device_list() 2021-06-07 16:45:05 +02:00
intel_pmic_chtwc.c
intel_pmic_xpower.c ACPI / PMIC: XPower: optimize MIPI PMIQ sequence I2C-bus accesses 2021-07-16 19:05:59 +02:00
intel_pmic.c
intel_pmic.h
Kconfig mfd: tps68470: Remove tps68470 MFD driver 2021-06-17 13:12:18 +02:00
Makefile ACPI / PMIC: Move TPS68470 OpRegion driver to drivers/acpi/pmic/ 2020-09-15 19:40:59 +02:00
tps68470_pmic.c