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charset="utf-8" When transmitting codes from certain infrared remote controls, the kernel occasionally fails to receive them due to a timeout during transmission. This issue arises specifically in instances where the duration of the=20 signal exceeds the predefined limit (`IR_MAX_DURATION`) in the code handling logic located within `lirc_dev.c`: if (txbuf[i] > IR_MAX_DURATION - duration || !txbuf[i]) { pr_err("lirc_transmit duration out range[%d] txbuf:%d duration:%d\n", i, txbuf[i], duration); ret =3D -EINVAL; goto out_kfree; } The error manifests as an `EINVAL` (error number 22) being returned when attempting to send infrared signals whose individual elements exceed the maximum allowed duration (`xbuf[i] > IR_MAX_DURATION - duration`). As evidenced by logs, attempts to send commands with extended durations, such as those associated with the "Power" button on a Skyworth TV remote, fail with this error. To rectify this and ensure compatibility with a broader range of infrared remote controls, particularly those with lengthy code sequences, this patch proposes to increase the value of `IR_MAX_DURATION`.=20 This adjustment will allow for successful transmission of these extended codes, thereby enhancing overall device compatibility and ensuring proper functionality of remotes with long duration signals. Example log entries highlighting the issue: D ConsumerIrHal: IRTX: Send to driver <268> E ConsumerIrHal: irtx write fail, errno=3D22 <269> D ConsumerIrHal: Done, Turn OFF IRTX <270> Modifying the maximum timeout time in this area can solve this issue. Signed-off-by: Huang Lipeng Signed-off-by: Shen Lichuan --- include/media/rc-core.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/media/rc-core.h b/include/media/rc-core.h index d095908073ef..2f575c18b6b6 100644 --- a/include/media/rc-core.h +++ b/include/media/rc-core.h @@ -303,7 +303,7 @@ struct ir_raw_event { =20 #define US_TO_NS(usec) ((usec) * 1000) #define MS_TO_US(msec) ((msec) * 1000) -#define IR_MAX_DURATION MS_TO_US(500) +#define IR_MAX_DURATION MS_TO_US(1000) #define IR_DEFAULT_TIMEOUT MS_TO_US(125) #define IR_MAX_TIMEOUT LIRC_VALUE_MASK =20 --=20 2.17.1