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uart: fix FSM check to avoid PM deadlocks

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Incorrect FSM status checks in the suspend path could cause
deadlocks when power management was enabled. This patch fixes
the condition to allow proper UART suspend/resume handling.

Signed-off-by: Thiago Finelon <thiago.sfinelon@gmail.com>
This commit is contained in:
Thiago Finelon
2025-10-03 14:00:13 -03:00
committed by Alan C. Assis
parent f7f769d7cd
commit 7fe0fbd9b8
1 changed files with 1 additions and 1 deletions
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arch/xtensa/src/esp32s3/esp32s3_pm.c
+1 -1
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@@ -320,7 +320,7 @@ static void IRAM_ATTR esp32s3_suspend_uarts(void)
UART_SW_FLOW_CON_EN | UART_FORCE_XOFF);
do
{
uart_fsm = REG_GET_FIELD(UART_STATUS_REG(i), UART_ST_UTX_OUT);
uart_fsm = REG_GET_FIELD(UART_FSM_STATUS_REG(i), UART_ST_UTX_OUT);
}
while (!(uart_fsm == UART_FSM_IDLE ||
uart_fsm == UART_FSM_TX_WAIT_SEND));