serial: stm32: fix clearing interrupt error flags

The interrupt clear flag register is a "write 1 to clear" register.
So, only writing ones allows to clear flags:
- Replace buggy stm32_clr_bits() by a simple write to clear error flags
- Replace useless read/modify/write stm32_set_bits() routine by a
  simple write to clear TC (transfer complete) flag.

Fixes: 4f01d833fdcd ("serial: stm32: fix rx error handling")
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/1574323849-1909-1-git-send-email-fabrice.gasnier@st.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index df90747ee3a81bd6733a7257ea722f6deb41c3f6..2f72514d63edd7dbdf70978ea5e4f25dc5eb012a 100644 (file)
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -240,8 +240,8 @@ static void stm32_receive_chars(struct uart_port *port, bool threaded)
                 * cleared by the sequence [read SR - read DR].
                 */
                if ((sr & USART_SR_ERR_MASK) && ofs->icr != UNDEF_REG)
-                       stm32_clr_bits(port, ofs->icr, USART_ICR_ORECF |
-                                      USART_ICR_PECF | USART_ICR_FECF);
+                       writel_relaxed(sr & USART_SR_ERR_MASK,
+                                      port->membase + ofs->icr);
 
                c = stm32_get_char(port, &sr, &stm32_port->last_res);
                port->icount.rx++;
@@ -435,7 +435,7 @@ static void stm32_transmit_chars(struct uart_port *port)
        if (ofs->icr == UNDEF_REG)
                stm32_clr_bits(port, ofs->isr, USART_SR_TC);
        else
-               stm32_set_bits(port, ofs->icr, USART_ICR_TCCF);
+               writel_relaxed(USART_ICR_TCCF, port->membase + ofs->icr);
 
        if (stm32_port->tx_ch)
                stm32_transmit_chars_dma(port);