linux/drivers/base
Andy Shevchenko bdff4cf712 regmap: Synchronize cache for the page selector
[ Upstream commit 09e70e4f11 ]

If the selector register is represented in each page, its value
according to the debugfs is stale because it gets synchronized
only after the real page switch happens. Hence the regmap cache
initialisation from the HW inherits outdated data in the selector
register.

Synchronize cache for the page selector just in time.

Before (offset followed by hexdump, the first byte is selector):

    // Real registers
    18: 05 ff 00 00 ff 0f 00 00 f0 00 00 00
    ...
    // Virtual (per port)
    40: 05 ff 00 00 e0 e0 00 00 00 00 00 1f
    50: 00 ff 00 00 e0 e0 00 00 00 00 00 1f
    60: 01 ff 00 00 ff ff 00 00 00 00 00 00
    70: 02 ff 00 00 cf f3 00 00 00 00 00 0c
    80: 03 ff 00 00 00 00 00 00 00 00 00 ff
    90: 04 ff 00 00 ff 0f 00 00 f0 00 00 00

After:

    // Real registers
    18: 05 ff 00 00 ff 0f 00 00 f0 00 00 00
    ...
    // Virtual (per port)
    40: 00 ff 00 00 e0 e0 00 00 00 00 00 1f
    50: 01 ff 00 00 e0 e0 00 00 00 00 00 1f
    60: 02 ff 00 00 ff ff 00 00 00 00 00 00
    70: 03 ff 00 00 cf f3 00 00 00 00 00 0c
    80: 04 ff 00 00 00 00 00 00 00 00 00 ff
    90: 05 ff 00 00 ff 0f 00 00 f0 00 00 00

Fixes: 6863ca6227 ("regmap: Add support for register indirect addressing.")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://patch.msgid.link/20260302184753.2693803-1-andriy.shevchenko@linux.intel.com
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2026-04-18 10:33:25 +02:00
..
firmware_loader firmware_loader: Block path traversal 2024-10-17 15:11:12 +02:00
power PM: runtime: Fix a race condition related to device removal 2026-04-18 10:33:21 +02:00
regmap regmap: Synchronize cache for the page selector 2026-04-18 10:33:25 +02:00
test driver core: test_async: fix an error code 2023-09-19 12:22:45 +02:00
arch_numa.c memblock: drop memblock_free_early_nid() and memblock_free_early() 2025-03-13 12:50:07 +01:00
arch_topology.c arch_topology: Fix incorrect error check in topology_parse_cpu_capacity() 2025-10-29 14:03:15 +01:00
attribute_container.c driver core: attribute_container: fix W=1 warnings 2021-05-14 13:37:10 +02:00
auxiliary.c Merge 5.14-rc3 into driver-core-next 2021-07-27 09:22:08 +02:00
base.h software nodes: Split software_node_notify() 2021-07-16 19:17:05 +02:00
bus.c driver core: bus: Fix double free in driver API bus_register() 2024-12-14 19:51:14 +01:00
cacheinfo.c cacheinfo: clear cache_leaves(cpu) in free_cache_attributes() 2021-07-21 17:29:40 +02:00
class.c class: fix possible memory leak in __class_register() 2022-12-31 13:14:27 +01:00
component.c drivers: base: component: fix memory leak with using debugfs_lookup() 2023-03-11 13:57:38 +01:00
container.c driver core: Remove redundant license text 2017-12-07 18:36:44 +01:00
core.c driver core: Introduce device_find_any_child() helper 2024-12-14 19:50:59 +01:00
cpu.c x86/vmscape: Enable the mitigation 2025-09-11 17:17:17 +02:00
dd.c driver core: Release all resources during unbind before updating device links 2023-11-28 16:56:36 +00:00
devcoredump.c devcoredump: Fix circular locking dependency with devcd->mutex. 2025-10-29 14:03:15 +01:00
devres.c drivers: base: devres: Allow to release group on device release 2025-05-02 07:43:57 +02:00
devtmpfs.c devtmpfs regression fix: reconfigure on each mount 2022-01-20 09:13:13 +01:00
driver.c driver: platform: Add helper for safer setting of driver_override 2023-11-08 17:26:43 +01:00
firmware.c driver core: Remove redundant license text 2017-12-07 18:36:44 +01:00
hypervisor.c driver core: Remove redundant license text 2017-12-07 18:36:44 +01:00
init.c init: Initialize noop_backing_dev_info early 2022-06-22 14:22:02 +02:00
isa.c bus: Make remove callback return void 2021-07-21 11:53:42 +02:00
Kconfig RISC-V Patches for the 5.12 Merge Window 2021-02-26 10:28:35 -08:00
Makefile devres: Enable trace events 2021-06-15 17:14:36 +02:00
map.c driver: base: Prefer unsigned int to bare use of unsigned 2021-07-21 17:30:09 +02:00
memory.c mm/hwpoison: avoid the impact of hwpoison_filter() return value on mce handler 2022-07-12 16:35:05 +02:00
module.c Revert "driver core: Fix uevent_show() vs driver detach race" 2024-11-08 16:25:54 +01:00
node.c drivers/base/node: fix double free in register_one_node() 2025-10-19 16:21:37 +02:00
pinctrl.c driver core: Remove redundant license text 2017-12-07 18:36:44 +01:00
platform-msi.c platform-msi: Add ABI to show msi_irqs of platform devices 2021-08-24 09:16:20 +02:00
platform.c driver: platform: Add helper for safer setting of driver_override 2023-11-08 17:26:43 +01:00
property.c device property: Allow secondary lookup in fwnode_get_next_child_node() 2026-04-18 10:33:15 +02:00
soc.c soc: fix comment for freeing soc_dev_attr 2020-12-09 19:46:31 +01:00
swnode.c software node: Correct a OOB check in software_node_get_reference_args() 2025-06-27 11:05:32 +01:00
syscore.c syscore: Use pm_pr_dbg() for syscore_{suspend,resume}() 2020-09-08 13:32:06 +02:00
topology.c topology: Keep the cpumask unchanged when printing cpumap 2025-01-23 17:15:53 +01:00
trace.c devres: Enable trace events 2021-06-15 17:14:36 +02:00
trace.h devres: Enable trace events 2021-06-15 17:14:36 +02:00
transport_class.c drivers: base: transport_class: fix resource leak when transport_add_device() fails 2023-03-10 09:39:39 +01:00