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From: "Andrew Jeffery" <andrew@aj.id.au>
To: "Philippe Mathieu-Daudé" <f4bug@amsat.org>,
	"Cameron Esfahani via" <qemu-devel@nongnu.org>
Cc: "Kevin Wolf" <kwolf@redhat.com>,
	"Peter Maydell" <peter.maydell@linaro.org>,
	qemu-block@nongnu.org, "Corey Minyard" <minyard@acm.org>,
	"David Hildenbrand" <david@redhat.com>,
	"Michael S. Tsirkin" <mst@redhat.com>,
	"Mark Cave-Ayland" <mark.cave-ayland@ilande.co.uk>,
	"Max Reitz" <mreitz@redhat.com>,
	qemu-arm@nongnu.org, "Joel Stanley" <joel@jms.id.au>,
	"Paolo Bonzini" <pbonzini@redhat.com>,
	"Cédric Le Goater" <clg@kaod.org>
Subject: Re: [PATCH 7/7] hw/watchdog/wdt_aspeed: Reduce timer precision to micro-second
Date: Wed, 17 Jun 2020 10:48:36 +0930	[thread overview]
Message-ID: <914f089d-e81e-4b01-bd70-4702d8b39724@www.fastmail.com> (raw)
In-Reply-To: <20200616075121.12837-8-f4bug@amsat.org>



On Tue, 16 Jun 2020, at 17:21, Philippe Mathieu-Daudé wrote:
> The current implementation uses nano-second precision, while
> the watchdog can not be more precise than a micro-second.

What's the basis for this assertion? It's true for the AST2500 and AST2600, but 
the AST2400 can run the watchdog from either a 1MHz clock source or the APB 
clock (which must be at least 16.5MHz on palmetto). The reset state on the
AST2400 configures the watchdog for the APB clock rate.

The Linux driver will eventually configure the watchdog for 1MHz mode
regardless so perhaps the AST2400 reset state is a bit of a corner case, but
I feel the assertion should be watered down a bit?

Andrew


  reply	other threads:[~2020-06-17  1:19 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-16  7:51 [PATCH 0/7] misc: Reduce QEMUTimer pressure by using lower precision when possible Philippe Mathieu-Daudé
2020-06-16  7:51 ` [PATCH 1/7] qemu-common: Briefly document qemu_timedate_diff() unit Philippe Mathieu-Daudé
2020-06-18  5:47   ` Markus Armbruster
2020-06-22  8:50     ` Philippe Mathieu-Daudé
2020-06-16  7:51 ` [PATCH 2/7] block/qcow2: Document cache_clean_interval field holds seconds Philippe Mathieu-Daudé
2020-06-16  7:51 ` [PATCH 3/7] block/curl: Reduce timer precision to milli-second Philippe Mathieu-Daudé
2020-06-16  7:51 ` [PATCH 4/7] hw/virtio/virtio-balloon: Rename timer field including 'ms' unit Philippe Mathieu-Daudé
2020-06-16  7:57   ` David Hildenbrand
2020-06-16  7:51 ` [PATCH 5/7] hw/rtc/m48t59: Reduce timer precision to milli-second Philippe Mathieu-Daudé
2020-07-08 23:39   ` Richard Henderson
2020-06-16  7:51 ` [PATCH 6/7] hw/ipmi/ipmi_bmc_extern: " Philippe Mathieu-Daudé
2020-06-16  7:51 ` [PATCH 7/7] hw/watchdog/wdt_aspeed: Reduce timer precision to micro-second Philippe Mathieu-Daudé
2020-06-17  1:18   ` Andrew Jeffery [this message]
2020-06-17  3:41     ` Philippe Mathieu-Daudé
2020-06-22  0:21       ` Andrew Jeffery
2020-06-22  8:43         ` Philippe Mathieu-Daudé
2020-06-22 23:45           ` Andrew Jeffery
2020-07-08 23:40   ` Richard Henderson
2020-06-18 12:23 ` [PATCH 0/7] misc: Reduce QEMUTimer pressure by using lower precision when possible Paolo Bonzini
2020-06-18 12:26   ` Philippe Mathieu-Daudé
2020-06-18 12:42     ` Paolo Bonzini
2020-07-08 23:37 ` Richard Henderson

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