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-rw-r--r--target/linux/mediatek/patches-5.4/0900-bt-mtk-serial-fix.patch33
1 files changed, 33 insertions, 0 deletions
diff --git a/target/linux/mediatek/patches-5.4/0900-bt-mtk-serial-fix.patch b/target/linux/mediatek/patches-5.4/0900-bt-mtk-serial-fix.patch
new file mode 100644
index 0000000000..6d4cce276b
--- /dev/null
+++ b/target/linux/mediatek/patches-5.4/0900-bt-mtk-serial-fix.patch
@@ -0,0 +1,33 @@
+--- a/drivers/tty/serial/8250/8250.h
++++ b/drivers/tty/serial/8250/8250.h
+@@ -80,6 +80,7 @@ struct serial8250_config {
+ #define UART_CAP_MINI (1 << 17) /* Mini UART on BCM283X family lacks:
+ * STOP PARITY EPAR SPAR WLEN5 WLEN6
+ */
++#define UART_CAP_NMOD (1 << 18) /* UART doesn't do termios */
+
+ #define UART_BUG_QUOT (1 << 0) /* UART has buggy quot LSB */
+ #define UART_BUG_TXEN (1 << 1) /* UART has buggy TX IIR status */
+--- a/drivers/tty/serial/8250/8250_port.c
++++ b/drivers/tty/serial/8250/8250_port.c
+@@ -297,7 +297,7 @@ static const struct serial8250_config ua
+ .tx_loadsz = 16,
+ .fcr = UART_FCR_ENABLE_FIFO |
+ UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
+- .flags = UART_CAP_FIFO,
++ .flags = UART_CAP_FIFO | UART_CAP_NMOD,
+ },
+ [PORT_NPCM] = {
+ .name = "Nuvoton 16550",
+@@ -2648,6 +2648,11 @@ serial8250_do_set_termios(struct uart_po
+ unsigned long flags;
+ unsigned int baud, quot, frac = 0;
+
++ if (up->capabilities & UART_CAP_NMOD) {
++ termios->c_cflag = 0;
++ return;
++ }
++
+ if (up->capabilities & UART_CAP_MINI) {
+ termios->c_cflag &= ~(CSTOPB | PARENB | PARODD | CMSPAR);
+ if ((termios->c_cflag & CSIZE) == CS5 ||