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linux/drivers/base/regmap
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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initialisation from the HW inherits outdated data in the selector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
..
internal.h regmap: Add bulk read/write callbacks into regmap_config 2024-03-15 10:48:23 -04:00
Kconfig regmap: Add MDIO bus support 2021-05-19 14:19:10 +01:00
Makefile regmap: Add MDIO bus support 2021-05-19 14:19:10 +01:00
regcache-flat.c regmap: add proper SPDX identifiers on files that did not have them. 2019-04-25 20:22:15 +01:00
regcache-lzo.c regmap: lzo: Switch to bitmap_zalloc() 2019-06-17 15:18:44 +01:00
regcache-rbtree.c regmap: rbtree: Fix wrong register marked as in-cache when creating new node 2023-10-10 21:59:06 +02:00
regcache.c regmap: fix bogus error on regcache_sync success 2023-12-13 18:36:44 +01:00
regmap-ac97.c regmap: add proper SPDX identifiers on files that did not have them. 2019-04-25 20:22:15 +01:00
regmap-debugfs.c regmap: debugfs: Fix a erroneous check after snprintf() 2023-11-20 11:08:16 +01:00
regmap-i2c.c regmap-i2c: Subtract reg size from max_write 2024-07-18 13:07:35 +02:00
regmap-i3c.c regmap: add i3c bus support 2019-06-07 13:09:55 +01:00
regmap-irq.c regmap-irq: Add missing kfree() 2025-03-13 12:50:41 +01:00
regmap-mdio.c regmap: mdio: Reject invalid addresses 2021-06-14 15:00:29 +01:00
regmap-mmio.c regmap: Prefer unsigned int to bare use of unsigned 2021-07-11 23:48:43 +01:00
regmap-sccb.c regmap: sccb: fix typo and sort headers alphabetically 2018-07-23 18:05:08 +01:00
regmap-sdw-mbq.c regmap: sdw-mbq: use MODULE_LICENSE("GPL") 2021-02-11 10:54:00 +05:30
regmap-sdw.c regmap: sdw: use _no_pm functions in regmap_read/write 2021-02-11 10:54:00 +05:30
regmap-slimbus.c regmap: slimbus: fix bus_context pointer in regmap init calls 2025-12-07 06:09:14 +09:00
regmap-spi-avmm.c regmap: Drop initial version of maximum transfer length fixes 2023-07-27 08:46:54 +02:00
regmap-spi.c regmap: add proper SPDX identifiers on files that did not have them. 2019-04-25 20:22:15 +01:00
regmap-spmi.c regmap: add proper SPDX identifiers on files that did not have them. 2019-04-25 20:22:15 +01:00
regmap-w1.c regmap: regmap-w1: Drop unreachable code 2019-11-19 13:09:20 +00:00
regmap.c regmap: Synchronize cache for the page selector 2026-04-18 10:33:25 +02:00
trace.h regmap: Remove duplicate type field from regmap regcache_sync trace event 2020-11-24 14:14:00 +00:00