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drivers: lpuart: prevent spurious transmission complete interrupts

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Correct issue where transmission complete interrupt was not disabled when
using interrupt driven serial API with power management enabled,
resulting in continuous spurious interrupts that effectively locked
the system.

Signed-off-by: Daniel DeGrasse <daniel.degrasse@nxp.com>
This commit is contained in:
Daniel DeGrasse 2022-07-12 15:29:10 -05:00 • committed by Mahesh Mahadevan
commit cb3d1313e5
1 changed files with 5 additions and 0 deletions
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5
drivers/serial/uart_mcux_lpuart.c
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@ -239,6 +239,9 @@ static void mcux_lpuart_irq_tx_enable(const struct device *dev)
key = irq_lock();
data->tx_poll_stream_on = false;
data->tx_int_stream_on = true;
/* Transmission complete interrupt no longer required */
LPUART_DisableInterrupts(config->base,
kLPUART_TransmissionCompleteInterruptEnable);
/* Do not allow system to sleep while UART tx is ongoing */
mcux_lpuart_pm_policy_state_lock_get(dev);
#endif
@ -847,6 +850,8 @@ static void mcux_lpuart_isr(const struct device *dev)
data->tx_poll_stream_on = false;
mcux_lpuart_pm_policy_state_lock_put(dev);
}
assert(LPUART_ClearStatusFlags(config->base,
kLPUART_TransmissionCompleteFlag) == 0U);
}
#endif /* CONFIG_PM */