linux-stable/drivers/base/regmap
Prasad Kumpatla d04ad245d6
regmap-irq: Update interrupt clear register for proper reset
With the existing logic where clear_ack is true (HW doesn’t support
auto clear for ICR), interrupt clear register reset is not handled
properly. Due to this only the first interrupts get processed properly
and further interrupts are blocked due to not resetting interrupt
clear register.

Example for issue case where Invert_ack is false and clear_ack is true:

    Say Default ISR=0x00 & ICR=0x00 and ISR is triggered with 2
    interrupts making ISR = 0x11.

    Step 1: Say ISR is set 0x11 (store status_buff = ISR). ISR needs to
            be cleared with the help of ICR once the Interrupt is processed.

    Step 2: Write ICR = 0x11 (status_buff), this will clear the ISR to 0x00.

    Step 3: Issue - In the existing code, ICR is written with ICR =
            ~(status_buff) i.e ICR = 0xEE -> This will block all the interrupts
            from raising except for interrupts 0 and 4. So expectation here is to
            reset ICR, which will unblock all the interrupts.

            if (chip->clear_ack) {
                 if (chip->ack_invert && !ret)
                  ........
                 else if (!ret)
                     ret = regmap_write(map, reg,
                            ~data->status_buf[i]);

So writing 0 and 0xff (when ack_invert is true) should have no effect, other
than clearing the ACKs just set.

Fixes: 3a6f0fb7b8 ("regmap: irq: Add support to clear ack registers")
Signed-off-by: Prasad Kumpatla <quic_pkumpatl@quicinc.com>
Reviewed-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/20220217085007.30218-1-quic_pkumpatl@quicinc.com
Signed-off-by: Mark Brown <broonie@kernel.org>
2022-02-17 15:33:15 +00:00
..
internal.h regmap: teach regmap to use raw spinlocks if requested in the config 2021-08-26 12:07:32 +01:00
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: Fix possible double-free in regcache_rbtree_exit() 2021-10-12 11:48:43 +01:00
regcache.c regmap: Assign boolean values to a bool variable 2021-01-21 12:42:20 +00:00
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 indentation 2022-01-07 19:16:23 +00:00
regmap-i2c.c regmap-i2c: Set regmap max raw r/w from quirks 2021-05-14 13:25:03 +01:00
regmap-i3c.c regmap: add i3c bus support 2019-06-07 13:09:55 +01:00
regmap-irq.c regmap-irq: Update interrupt clear register for proper reset 2022-02-17 15:33:15 +00:00
regmap-mdio.c net: Convert more users of mdiobus_* to mdiodev_* 2021-10-24 13:40:33 +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: add support to multi read/write 2018-07-11 11:58:04 +01:00
regmap-spi-avmm.c regmap: add Intel SPI Slave to AVMM Bus Bridge support 2020-08-26 19:46:38 +01:00
regmap-spi.c regmap: spi: Set regmap max raw r/w from max_transfer_size 2021-10-23 19:55:03 +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: Call regmap_debugfs_exit() prior to _init() 2022-01-07 17:14:29 +00:00
trace.h regmap: Remove duplicate type field from regmap regcache_sync trace event 2020-11-24 14:14:00 +00:00