diff options
author | Tom Rini <trini@konsulko.com> | 2022-09-19 20:19:39 +0300 |
---|---|---|
committer | Tom Rini <trini@konsulko.com> | 2022-09-19 23:07:12 +0300 |
commit | e9a1ff9724348408144c7f1c5b5cc26130ba46e5 (patch) | |
tree | 68b56f117206d121b4a7e567b0209c02283c98e6 /drivers/serial/serial_mxc.c | |
parent | b6c50e5831f6ce3800d4b3cf3c7aa35dde8c48d9 (diff) | |
parent | f76f3e3b44328fe6229650540109af93750fd5f0 (diff) | |
download | u-boot-e9a1ff9724348408144c7f1c5b5cc26130ba46e5.tar.xz |
Merge branch 'master' into next
Signed-off-by: Tom Rini <trini@konsulko.com>
Diffstat (limited to 'drivers/serial/serial_mxc.c')
-rw-r--r-- | drivers/serial/serial_mxc.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/drivers/serial/serial_mxc.c b/drivers/serial/serial_mxc.c index 315c136ef8..4cf79c1ca2 100644 --- a/drivers/serial/serial_mxc.c +++ b/drivers/serial/serial_mxc.c @@ -61,6 +61,11 @@ #define UCR3_AWAKEN (1<<4) /* Async wake interrupt enable */ #define UCR3_REF25 (1<<3) /* Ref freq 25 MHz */ #define UCR3_REF30 (1<<2) /* Ref Freq 30 MHz */ + +/* imx8 names these bitsfields instead: */ +#define UCR3_DTRDEN BIT(3) /* bit not used in this chip */ +#define UCR3_RXDMUXSEL BIT(2) /* RXD muxed input selected; 'should always be set' */ + #define UCR3_INVT (1<<1) /* Inverted Infrared transmission */ #define UCR3_BPEN (1<<0) /* Preset registers enable */ #define UCR4_CTSTL_32 (32<<10) /* CTS trigger level (32 chars) */ @@ -176,6 +181,14 @@ static void _mxc_serial_setbrg(struct mxc_uart *base, unsigned long clk, writel(UCR2_WS | UCR2_IRTS | UCR2_RXEN | UCR2_TXEN | UCR2_SRST, &base->cr2); + + /* + * setting the baudrate triggers a reset, returning cr3 to its + * reset value but UCR3_RXDMUXSEL "should always be set." + * according to the imx8 reference-manual + */ + writel(readl(&base->cr3) | UCR3_RXDMUXSEL, &base->cr3); + writel(UCR1_UARTEN, &base->cr1); } @@ -298,7 +311,7 @@ static int mxc_serial_putc(struct udevice *dev, const char ch) struct mxc_serial_plat *plat = dev_get_plat(dev); struct mxc_uart *const uart = plat->reg; - if (!(readl(&uart->ts) & UTS_TXEMPTY)) + if (readl(&uart->ts) & UTS_TXFULL) return -EAGAIN; writel(ch, &uart->txd); |