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DMA prevents the system to suspend when an UART RX wake-up source is using DMA. DMA can't suspend while DMA channels are still active. Terminate DMA transfer at suspend, and restart a new DMA transfer at resume. Create stm32_usart_start_rx_dma_cyclic function to factorize dma RX initialization. Move RX DMA code related to wakeup into stm32_usart_serial_en_wakeup() routine to ease further improvements on wakeup from low power modes. Don't enable/disable wakeup on uninitialized port. There may be data residue in the RX FIFO while suspending. Flush it at suspend time. Receiver timeout interrupt won't trigger later in low power mode, so call stm32_usart_receive_chars() in case there's data to handle. Signed-off-by: Valentin Caron <valentin.caron@foss.st.com> Signed-off-by: Erwan Le Ray <erwan.leray@foss.st.com> Link: https://lore.kernel.org/r/20211025134229.8456-3-erwan.leray@foss.st.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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| .. | ||
| hvc | ||
| ipwireless | ||
| serdev | ||
| serial | ||
| vt | ||
| amiserial.c | ||
| ehv_bytechan.c | ||
| goldfish.c | ||
| Kconfig | ||
| Makefile | ||
| mips_ejtag_fdc.c | ||
| moxa.c | ||
| mxser.c | ||
| n_gsm.c | ||
| n_hdlc.c | ||
| n_null.c | ||
| n_tty.c | ||
| nozomi.c | ||
| pty.c | ||
| rpmsg_tty.c | ||
| synclink_gt.c | ||
| sysrq.c | ||
| tty_audit.c | ||
| tty_baudrate.c | ||
| tty_buffer.c | ||
| tty_io.c | ||
| tty_ioctl.c | ||
| tty_jobctrl.c | ||
| tty_ldisc.c | ||
| tty_ldsem.c | ||
| tty_mutex.c | ||
| tty_port.c | ||
| tty.h | ||
| ttynull.c | ||
| vcc.c | ||