linux-kernel - Re: [PATCH v1 tty] 8250: microchip: pci1xxxx: Refactor TX Burst code to use pre-existing APIs

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Date: Fri, 23 Feb 2024 09:36:41 +0000
From: <Rengarajan.S@...rochip.com>
To: <jirislaby@...nel.org>, <linux-serial@...r.kernel.org>,
	<gregkh@...uxfoundation.org>, <Kumaravel.Thiagarajan@...rochip.com>,
	<UNGLinuxDriver@...rochip.com>, <Tharunkumar.Pasumarthi@...rochip.com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 tty] 8250: microchip: pci1xxxx: Refactor TX Burst code
 to use pre-existing APIs

On Fri, 2024-02-23 at 10:26 +0100, Jiri Slaby wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you
> know the content is safe
> 
> On 23. 02. 24, 10:21, Rengarajan.S@...rochip.com wrote:
> > On Fri, 2024-02-23 at 07:08 +0100, Jiri Slaby wrote:
> > > EXTERNAL EMAIL: Do not click links or open attachments unless you
> > > know the content is safe
> > > 
> > > On 22. 02. 24, 14:49, Rengarajan S wrote:
> > > > Updated the TX Burst implementation by changing the circular
> > > > buffer
> > > > processing with the pre-existing APIs in kernel. Also updated
> > > > conditional
> > > > statements and alignment issues for better readability.
> > > 
> > > Hi,
> > > 
> > > so why are you keeping the nested double loop?
> > > 
> > 
> > Hi, in order to differentiate Burst mode handling with byte mode
> > had
> > seperate loops for both. Since, having single while loop also does
> > not
> > align with rx implementation (where we have seperate handling for
> > burst
> > and byte) have retained the double loop.
> 
> So obviously, align RX to a single loop if possible. The current TX
> code
> is very hard to follow and sort of unmaintainable (and buggy). And
> IMO
> it's unnecessary as I proposed [1]. And even if RX cannot be one
> loop,
> you still can make TX easy to read as the two need not be the same.
> 
> [1]
> https://lore.kernel.org/all/b8325c3f-bf5b-4c55-8dce-ef395edce251@kernel.org/


Sure. Will update the TX implementation as suggested and will send out
the patch shortly.
> 
> thanks,
> --
> js
> suse labs
>