* [PATCH] serial: pl011: Do not clear RX FIFO & RX interrupt in unthrottle.
@ 2022-11-10 2:01 delisun
2022-11-10 10:24 ` Ilpo Järvinen
0 siblings, 1 reply; 5+ messages in thread
From: delisun @ 2022-11-10 2:01 UTC (permalink / raw)
To: linux; +Cc: gregkh, jirislaby, linux-serial, linux-kernel, delisun
Clearing the RX FIFO will cause data loss.
Copy the pl011_enabl_interrupts implementation, and remove the clear
interrupt and FIFO part of the code.
Fixes: 211565b10099 ("serial: pl011: UPSTAT_AUTORTS requires .throttle/unthrottle")
Signed-off-by: delisun <delisun@pateo.com.cn>
---
drivers/tty/serial/amba-pl011.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index 5cdced39eafd..08034e5dcec0 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -1828,8 +1828,17 @@ static void pl011_enable_interrupts(struct uart_amba_port *uap)
static void pl011_unthrottle_rx(struct uart_port *port)
{
struct uart_amba_port *uap = container_of(port, struct uart_amba_port, port);
+ unsigned long flags;
- pl011_enable_interrupts(uap);
+ spin_lock_irqsave(&uap->port.lock, flags);
+
+ uap->im = UART011_RTIM;
+ if (!pl011_dma_rx_running(uap))
+ uap->im |= UART011_RXIM;
+
+ pl011_write(uap->im, uap, REG_IMSC);
+
+ spin_unlock_irqrestore(&uap->port.lock, flags);
}
static int pl011_startup(struct uart_port *port)
--
2.25.1
^ permalink raw reply related [flat|nested] 5+ messages in thread* Re: [PATCH] serial: pl011: Do not clear RX FIFO & RX interrupt in unthrottle.
2022-11-10 2:01 [PATCH] serial: pl011: Do not clear RX FIFO & RX interrupt in unthrottle delisun
@ 2022-11-10 10:24 ` Ilpo Järvinen
0 siblings, 0 replies; 5+ messages in thread
From: Ilpo Järvinen @ 2022-11-10 10:24 UTC (permalink / raw)
To: delisun; +Cc: linux, Greg Kroah-Hartman, Jiri Slaby, linux-serial, LKML
[-- Attachment #1: Type: text/plain, Size: 1328 bytes --]
On Thu, 10 Nov 2022, delisun wrote:
> Clearing the RX FIFO will cause data loss.
> Copy the pl011_enabl_interrupts implementation, and remove the clear
> interrupt and FIFO part of the code.
>
> Fixes: 211565b10099 ("serial: pl011: UPSTAT_AUTORTS requires .throttle/unthrottle")
> Signed-off-by: delisun <delisun@pateo.com.cn>
> ---
> drivers/tty/serial/amba-pl011.c | 11 ++++++++++-
> 1 file changed, 10 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
> index 5cdced39eafd..08034e5dcec0 100644
> --- a/drivers/tty/serial/amba-pl011.c
> +++ b/drivers/tty/serial/amba-pl011.c
> @@ -1828,8 +1828,17 @@ static void pl011_enable_interrupts(struct uart_amba_port *uap)
> static void pl011_unthrottle_rx(struct uart_port *port)
> {
> struct uart_amba_port *uap = container_of(port, struct uart_amba_port, port);
> + unsigned long flags;
>
> - pl011_enable_interrupts(uap);
> + spin_lock_irqsave(&uap->port.lock, flags);
> +
> + uap->im = UART011_RTIM;
> + if (!pl011_dma_rx_running(uap))
> + uap->im |= UART011_RXIM;
> +
> + pl011_write(uap->im, uap, REG_IMSC);
> +
> + spin_unlock_irqrestore(&uap->port.lock, flags);
> }
>
> static int pl011_startup(struct uart_port *port)
Thanks.
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
--
i.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCH] serial: pl011: Do not clear RX FIFO & RX interrupt in unthrottle.
@ 2022-11-09 10:58 delisun
2022-11-09 11:55 ` Ilpo Järvinen
2022-11-17 21:10 ` Greg KH
0 siblings, 2 replies; 5+ messages in thread
From: delisun @ 2022-11-09 10:58 UTC (permalink / raw)
To: linux; +Cc: gregkh, jirislaby, linux-serial, linux-kernel, delisun
Clearing the RX FIFO will cause data loss.
Copy the pl011_enabl_interrupts implementation, and remove the clear
interrupt and FIFO part of the code.
Signed-off-by: delisun <delisun@pateo.com.cn>
---
drivers/tty/serial/amba-pl011.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index 5cdced39eafd..08034e5dcec0 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -1828,8 +1828,17 @@ static void pl011_enable_interrupts(struct uart_amba_port *uap)
static void pl011_unthrottle_rx(struct uart_port *port)
{
struct uart_amba_port *uap = container_of(port, struct uart_amba_port, port);
+ unsigned long flags;
- pl011_enable_interrupts(uap);
+ spin_lock_irqsave(&uap->port.lock, flags);
+
+ uap->im = UART011_RTIM;
+ if (!pl011_dma_rx_running(uap))
+ uap->im |= UART011_RXIM;
+
+ pl011_write(uap->im, uap, REG_IMSC);
+
+ spin_unlock_irqrestore(&uap->port.lock, flags);
}
static int pl011_startup(struct uart_port *port)
--
2.25.1
^ permalink raw reply related [flat|nested] 5+ messages in thread* Re: [PATCH] serial: pl011: Do not clear RX FIFO & RX interrupt in unthrottle.
2022-11-09 10:58 delisun
@ 2022-11-09 11:55 ` Ilpo Järvinen
2022-11-17 21:10 ` Greg KH
1 sibling, 0 replies; 5+ messages in thread
From: Ilpo Järvinen @ 2022-11-09 11:55 UTC (permalink / raw)
To: delisun; +Cc: linux, Greg Kroah-Hartman, Jiri Slaby, linux-serial, LKML
On Wed, 9 Nov 2022, delisun wrote:
> Clearing the RX FIFO will cause data loss.
> Copy the pl011_enabl_interrupts implementation, and remove the clear
> interrupt and FIFO part of the code.
>
You should add Fixes tag.
--
i.
> Signed-off-by: delisun <delisun@pateo.com.cn>
> ---
> drivers/tty/serial/amba-pl011.c | 11 ++++++++++-
> 1 file changed, 10 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
> index 5cdced39eafd..08034e5dcec0 100644
> --- a/drivers/tty/serial/amba-pl011.c
> +++ b/drivers/tty/serial/amba-pl011.c
> @@ -1828,8 +1828,17 @@ static void pl011_enable_interrupts(struct uart_amba_port *uap)
> static void pl011_unthrottle_rx(struct uart_port *port)
> {
> struct uart_amba_port *uap = container_of(port, struct uart_amba_port, port);
> + unsigned long flags;
>
> - pl011_enable_interrupts(uap);
> + spin_lock_irqsave(&uap->port.lock, flags);
> +
> + uap->im = UART011_RTIM;
> + if (!pl011_dma_rx_running(uap))
> + uap->im |= UART011_RXIM;
> +
> + pl011_write(uap->im, uap, REG_IMSC);
> +
> + spin_unlock_irqrestore(&uap->port.lock, flags);
^ permalink raw reply [flat|nested] 5+ messages in thread* Re: [PATCH] serial: pl011: Do not clear RX FIFO & RX interrupt in unthrottle.
2022-11-09 10:58 delisun
2022-11-09 11:55 ` Ilpo Järvinen
@ 2022-11-17 21:10 ` Greg KH
1 sibling, 0 replies; 5+ messages in thread
From: Greg KH @ 2022-11-17 21:10 UTC (permalink / raw)
To: delisun; +Cc: linux, jirislaby, linux-serial, linux-kernel
On Wed, Nov 09, 2022 at 06:58:22PM +0800, delisun wrote:
> Clearing the RX FIFO will cause data loss.
> Copy the pl011_enabl_interrupts implementation, and remove the clear
> interrupt and FIFO part of the code.
>
> Signed-off-by: delisun <delisun@pateo.com.cn>
> ---
> drivers/tty/serial/amba-pl011.c | 11 ++++++++++-
> 1 file changed, 10 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
> index 5cdced39eafd..08034e5dcec0 100644
> --- a/drivers/tty/serial/amba-pl011.c
> +++ b/drivers/tty/serial/amba-pl011.c
> @@ -1828,8 +1828,17 @@ static void pl011_enable_interrupts(struct uart_amba_port *uap)
> static void pl011_unthrottle_rx(struct uart_port *port)
> {
> struct uart_amba_port *uap = container_of(port, struct uart_amba_port, port);
> + unsigned long flags;
>
> - pl011_enable_interrupts(uap);
> + spin_lock_irqsave(&uap->port.lock, flags);
> +
> + uap->im = UART011_RTIM;
> + if (!pl011_dma_rx_running(uap))
> + uap->im |= UART011_RXIM;
> +
> + pl011_write(uap->im, uap, REG_IMSC);
> +
> + spin_unlock_irqrestore(&uap->port.lock, flags);
> }
>
> static int pl011_startup(struct uart_port *port)
> --
> 2.25.1
>
>
>
How was this tested?
What commit id does this fix?
And your email is showing up as unvalidated, please fix your email
infrastructure to properly verify messages.
thanks,
greg k-h
^ permalink raw reply [flat|nested] 5+ messages in thread
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2022-11-10 2:01 [PATCH] serial: pl011: Do not clear RX FIFO & RX interrupt in unthrottle delisun
2022-11-10 10:24 ` Ilpo Järvinen
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2022-11-09 11:55 ` Ilpo Järvinen
2022-11-17 21:10 ` Greg KH
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