linux-kernel - Re: [PATCH v3 1/2] dt-bindings: serial: 8250: Add rate limit for serial port input overruns

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Date:   Mon, 10 Dec 2018 17:23:05 -0600
From:   Rob Herring <robh@...nel.org>
To:     Darwin Dingel <darwin.dingel@...iedtelesis.co.nz>
Cc:     gregkh@...uxfoundation.org, robh+dt@...nel.org,
        chris.packham@...iedtelesis.co.nz, linux-serial@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Darwin Dingel <darwin.dingel@...iedtelesis.co.nz>
Subject: Re: [PATCH v3 1/2] dt-bindings: serial: 8250: Add rate limit for
 serial port input overruns

On Mon, 10 Dec 2018 11:27:39 +1300, Darwin Dingel wrote:
> When a serial port continuously experiences input overrun from
> (1) continuous receive characters from remote and or (2) hardware
> issues, its interrupt handler can preempt other tasks especially
> when the system is busy (ie. boot up period). This can cause other
> tasks to get starved of processing time from the CPU.
> 
> When this dts binding is enabled and input overrun on the serial port
> is detected, serial port receive will be throttled to give some breathing
> room for processing other tasks. Value provided will be in milliseconds.
> 
> &serial0{
> 	overrun-throttle-ms = <500>;
> };
> 
> Signed-off-by: Darwin Dingel <darwin.dingel@...iedtelesis.co.nz>
> ---
> 
> Notes:
>     Changelog
>     v1->v2:
>     - Separated dts binding to another patch
>     
>     v2->v3:
>     - Fixed commit message and reviewed-by fields
> 
>  Documentation/devicetree/bindings/serial/8250.txt | 1 +
>  1 file changed, 1 insertion(+)
> 

Reviewed-by: Rob Herring <robh@...nel.org>