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| author | Even Xu <even.xu@intel.com> | 2025-05-14 09:19:41 +0300 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.com> | 2025-06-10 22:15:59 +0300 |
| commit | 22da60f0304b6bfd2c7cba8ee88086f344ef5206 (patch) | |
| tree | 6c5d1f11763a78d18a0bec272b33f4c305b9c268 /Documentation/hid | |
| parent | 45e92a093099eaf71ff2915a5f6ab5c04c8385e6 (diff) | |
| download | linux-22da60f0304b6bfd2c7cba8ee88086f344ef5206.tar.xz | |
HID: Intel-thc-hid: Intel-thc: Introduce interrupt delay control
This patch adds support for a new feature, named "Interrupt Delay",
allowing driver to set a specific delay time for next interrupt
detection. It gives driver a capability to control THC waiting time for
the next interrupt, to reduce the likelihood of spurious readings.
APIs added:
- thc_i2c_set_rx_int_delay(): Set I2C Rx input interrupt delay value
- thc_i2c_rx_int_delay_enable(): Enable or disable I2C Rx interrupt delay
As this interrupt delay feature is only applicable to RxDMA and must
remain disabled during SWDMA operations, it also involves a change
in SWDMA code to record the max input size control feature state
before SWDMA and restore the state after SWDMA.
Signed-off-by: Even Xu <even.xu@intel.com>
Tested-by: Chong Han <chong.han@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>
Diffstat (limited to 'Documentation/hid')
| -rw-r--r-- | Documentation/hid/intel-thc-hid.rst | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/Documentation/hid/intel-thc-hid.rst b/Documentation/hid/intel-thc-hid.rst index 15b04fa215c7..23d5110cb871 100644 --- a/Documentation/hid/intel-thc-hid.rst +++ b/Documentation/hid/intel-thc-hid.rst @@ -202,6 +202,19 @@ input packet size with the given max size: This feature is used to avoid data corruption which will cause RxDMA buffer overrun issue for I2C bus, and enhance whole system stability. +2.4 Interrupt delay +------------------- + +Because of MCU performance limitation, some touch devices cannot de-assert interrupt pin +immediately after input data is transferred, which cause an interrupt toggle delay. But THC +always detects next interrupt immediately after last input interrupt is handled. In this +case, the delayed interrupt de-assertion will be recognized as a new interrupt signal by THC, +and causes THC to start an input report reading spuriously. + +In order to avoid this situation, THC introduced interrupt delay new feature in Panther Lake +platform, where THC allows driver to set an interrupt delay. After this feature is enabled, +THC will delay this given time for next interrupt detection. + 3. High level concept ===================== |