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arch: cxd56xx: Fix uart getting stuck during a clock change

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UART driver is stopped and re-started during a clock change. When a UART
interrupt is generated in each process, the unexpected behavior will
occur and a console will get stuck with UART driver. This commit fixed
each process is performed atomically.
This commit is contained in:
SPRESENSE 2021-05-19 17:03:36 +09:00 committed by Alin Jerpelea
parent 85f0bc591e
commit 9b3a80cc37
1 changed files with 8 additions and 0 deletions
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8
arch/arm/src/cxd56xx/cxd56_uart.c
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@ -206,11 +206,15 @@ static void cxd56_uart_pincontrol(int ch, bool on)
static void cxd56_uart_start(int ch)
{
irqstate_t flags = enter_critical_section();
cxd56_setbaud(CONSOLE_BASE, CONSOLE_BASEFREQ, CONSOLE_BAUD);
putreg32(g_lcr, g_uartdevs[ch].uartbase + CXD56_UART_LCR_H);
putreg32(g_cr, g_uartdevs[ch].uartbase + CXD56_UART_CR);
leave_critical_section(flags);
}
/****************************************************************************
@ -226,6 +230,8 @@ static void cxd56_uart_stop(int ch)
{
uint32_t cr;
irqstate_t flags = enter_critical_section();
while (UART_FR_BUSY & getreg32(g_uartdevs[ch].uartbase + CXD56_UART_FR));
cr = getreg32(g_uartdevs[ch].uartbase + CXD56_UART_CR);
@ -235,6 +241,8 @@ static void cxd56_uart_stop(int ch)
g_lcr = getreg32(g_uartdevs[ch].uartbase + CXD56_UART_LCR_H);
putreg32(0, g_uartdevs[ch].uartbase + CXD56_UART_LCR_H);
leave_critical_section(flags);
}
/****************************************************************************