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TX DMA state condition is handled by tx_dma_busy boolean. This boolean is set when dma descriptor is requested and reset when dma channel is stopped (dma_terminate). In stm32_usart_serial_remove(), stm32_usart_stop_tx() and stm32_usart_transmit_chars_dma() fallback error case, DMA channel is stopped but tx_dma_busy is not handled. Rework the driver by using two new functions to solve this issue: - stm32_usart_tx_dma_started return true if DMA TX have a descriptor. - stm32_usart_tx_dma_enabled return true if DMAT bit is set. stm32_usart_tx_dma_started uses tx_dma_busy flag to prevent dual DMA transaction at the same time. This flag is set when a DMA transaction begins and is unset when dmaengine_terminate_async function is called. A new DMA transaction cannot be created if this flag is set. Create a new function "stm32_usart_tx_dma_terminate" to be sure the flag is unset after each call of dmaengine_terminate_async. Signed-off-by: Erwan Le Ray <erwan.leray@foss.st.com> Signed-off-by: Valentin Caron <valentin.caron@foss.st.com> Link: https://lore.kernel.org/r/20220104182445.4195-3-valentin.caron@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 |