linux-kernel - Re: [PATCH 0/3] serial: samsung: Fix UART status handling and other fixes

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Date:	Wed, 09 Sep 2015 08:47:33 +0900
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Robert Baldyga <r.baldyga@...sung.com>, gregkh@...uxfoundation.org
Cc:	jslaby@...e.com, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org, m.szyprowski@...sung.com
Subject: Re: [PATCH 0/3] serial: samsung: Fix UART status handling and other
 fixes

On 08.09.2015 18:38, Robert Baldyga wrote:
> Hello,
> 
> This patch set contains three patches: two minor fixes and one quite
> important bugfix enabling UART status handling in DMA mode, which was
> missing so far. It enables, among others, 'break' contition handling,
> which is necessary if we want to use Magic SysRq. So this patch fixes
> Magic SysRq handling for serial consoles using UART in DMA mode,

Is it even worth using UART for serial console in DMA mode? How many
benefits it brings? Anyone measured real data?

The patch which enabled DMA for all serial ports on Exynos4 uncovered
some issues. That is one benefit... but was it worth it?

Best regards,
Krzysztof

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