diff options
| author | Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> | 2022-05-19 10:18:07 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-05-19 18:32:40 +0200 |
| commit | 1deeda8d2877c18bc2b9eeee10dd6d2628852848 (patch) | |
| tree | 470b7755127ee0151c42a870f449e44b017a7884 /drivers/tty | |
| parent | serial: st-asc: Sanitize CSIZE and correct PARENB for CS7 (diff) | |
| download | linux-1deeda8d2877c18bc2b9eeee10dd6d2628852848.tar.xz linux-1deeda8d2877c18bc2b9eeee10dd6d2628852848.zip | |
serial: stm32-usart: Correct CSIZE, bits, and parity
Add CSIZE sanitization for unsupported CSIZE configurations. In
addition, if parity is asked for but CSx was unsupported, the sensible
result is CS8+parity which requires setting USART_CR1_M0 like with 9
bits.
Incorrect CSIZE results in miscalculation of the frame bits in
tty_get_char_size() or in its predecessor where the roughly the same
code is directly within uart_update_timeout().
Fixes: c8a9d043947b (serial: stm32: fix word length configuration)
Cc: Erwan Le Ray <erwan.leray@st.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20220519081808.3776-9-ilpo.jarvinen@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/stm32-usart.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c index 764415b8e8f0..b7b44f4050d4 100644 --- a/drivers/tty/serial/stm32-usart.c +++ b/drivers/tty/serial/stm32-usart.c @@ -1088,13 +1088,22 @@ static void stm32_usart_set_termios(struct uart_port *port, * CS8 or (CS7 + parity), 8 bits word aka [M1:M0] = 0b00 * M0 and M1 already cleared by cr1 initialization. */ - if (bits == 9) + if (bits == 9) { cr1 |= USART_CR1_M0; - else if ((bits == 7) && cfg->has_7bits_data) + } else if ((bits == 7) && cfg->has_7bits_data) { cr1 |= USART_CR1_M1; - else if (bits != 8) + } else if (bits != 8) { dev_dbg(port->dev, "Unsupported data bits config: %u bits\n" , bits); + cflag &= ~CSIZE; + cflag |= CS8; + termios->c_cflag = cflag; + bits = 8; + if (cflag & PARENB) { + bits++; + cr1 |= USART_CR1_M0; + } + } if (ofs->rtor != UNDEF_REG && (stm32_port->rx_ch || (stm32_port->fifoen && |