| Message ID | 20211230102110.3861-6-yu.tu@amlogic.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | the UART driver compatible with the Amlogic Meson | expand |
On Thu, Dec 30, 2021 at 11:22 AM Yu Tu <yu.tu@amlogic.com> wrote: [...] > val = readl(port->membase + AML_UART_CONTROL); > - val &= ~AML_UART_RX_EN; > + val &= ~(AML_UART_RX_EN | AML_UART_TX_EN); > val &= ~(AML_UART_RX_INT_EN | AML_UART_TX_INT_EN); > writel(val, port->membase + AML_UART_CONTROL); This looks fine to me but I think it would be good to Cc the author of commit 855ddcab352c15 ("ARM: meson: serial: only disable tx irq on stop") The meson_uart driver which Carlo added eight years ago did clear AML_UART_TX_EN here, but it was changed with the commit I mentioned above. Best regards, Martin
On 2021/12/31 6:44, Martin Blumenstingl wrote: > [ EXTERNAL EMAIL ] > > On Thu, Dec 30, 2021 at 11:22 AM Yu Tu <yu.tu@amlogic.com> wrote: > [...] >> val = readl(port->membase + AML_UART_CONTROL); >> - val &= ~AML_UART_RX_EN; >> + val &= ~(AML_UART_RX_EN | AML_UART_TX_EN); >> val &= ~(AML_UART_RX_INT_EN | AML_UART_TX_INT_EN); >> writel(val, port->membase + AML_UART_CONTROL); > This looks fine to me but I think it would be good to Cc the author of > commit 855ddcab352c15 ("ARM: meson: serial: only disable tx irq on > stop") > The meson_uart driver which Carlo added eight years ago did clear > AML_UART_TX_EN here, but it was changed with the commit I mentioned > above. > I'm going to delete this change this time. Because there is no bug at present, if this is a bug encountered later, i will prepare to submit this change. > > Best regards, > Martin >
diff --git a/drivers/tty/serial/meson_uart.c b/drivers/tty/serial/meson_uart.c index 07eb1f40aaaa..45e41f20cba3 100644 --- a/drivers/tty/serial/meson_uart.c +++ b/drivers/tty/serial/meson_uart.c @@ -140,7 +140,7 @@ static void meson_uart_shutdown(struct uart_port *port) spin_lock_irqsave(&port->lock, flags); val = readl(port->membase + AML_UART_CONTROL); - val &= ~AML_UART_RX_EN; + val &= ~(AML_UART_RX_EN | AML_UART_TX_EN); val &= ~(AML_UART_RX_INT_EN | AML_UART_TX_INT_EN); writel(val, port->membase + AML_UART_CONTROL);
This change is an improvement. The meson_uart_shutdown function should have the opposite operation to the meson_uart_startup function, but the meson_uart_shutdown of AML_UART_TX_EN is logically missing. Signed-off-by: Yu Tu <yu.tu@amlogic.com> --- drivers/tty/serial/meson_uart.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)