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From: Tony Lindgren <tony@atomide.com>
To: Grygorii Strashko <grygorii.strashko@ti.com>
Cc: Lokesh Vutla <lokeshvutla@ti.com>,
	Felipe Balbi <balbi@kernel.org>,
	linux-omap@vger.kernel.org, nsekhar@ti.com,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH] ARM: omap2: am437x: rollback to use omap3_gptimer_timer_init()
Date: Tue, 12 Apr 2016 09:04:49 -0700	[thread overview]
Message-ID: <20160412160448.GN5995@atomide.com> (raw)
In-Reply-To: <1460457775-23850-1-git-send-email-grygorii.strashko@ti.com>

* Grygorii Strashko <grygorii.strashko@ti.com> [160412 03:44]:
> The commit 55ee7017ee31 ("arm: omap2: board-generic: use
> omap4_local_timer_init for AM437x") unintentionally changes the
> clocksource devices for AM437x from OMAP GP Timer to SyncTimer32K.
> 
> Unfortunately, the SyncTimer32K is starving from frequency deviation
> as mentioned in commit 5b5c01359152 ("ARM: OMAP2+: AM43x: Use gptimer
> as clocksource") and, as reported by Franklin [1], even its monotonic
> nature is under question (most probably there is a HW issue, but it's
> still under investigation).
> 
> Taking into account above facts It's reasonable to rollback to the use
> of omap3_gptimer_timer_init().

I thought only the ePOS EVM does not have the 32k clock available?
Maybe this is the the old sync timer autocorrection drift issue?

Regards,

Tony

WARNING: multiple messages have this Message-ID (diff)
From: tony@atomide.com (Tony Lindgren)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ARM: omap2: am437x: rollback to use omap3_gptimer_timer_init()
Date: Tue, 12 Apr 2016 09:04:49 -0700	[thread overview]
Message-ID: <20160412160448.GN5995@atomide.com> (raw)
In-Reply-To: <1460457775-23850-1-git-send-email-grygorii.strashko@ti.com>

* Grygorii Strashko <grygorii.strashko@ti.com> [160412 03:44]:
> The commit 55ee7017ee31 ("arm: omap2: board-generic: use
> omap4_local_timer_init for AM437x") unintentionally changes the
> clocksource devices for AM437x from OMAP GP Timer to SyncTimer32K.
> 
> Unfortunately, the SyncTimer32K is starving from frequency deviation
> as mentioned in commit 5b5c01359152 ("ARM: OMAP2+: AM43x: Use gptimer
> as clocksource") and, as reported by Franklin [1], even its monotonic
> nature is under question (most probably there is a HW issue, but it's
> still under investigation).
> 
> Taking into account above facts It's reasonable to rollback to the use
> of omap3_gptimer_timer_init().

I thought only the ePOS EVM does not have the 32k clock available?
Maybe this is the the old sync timer autocorrection drift issue?

Regards,

Tony

  parent reply	other threads:[~2016-04-12 16:04 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-04-12 10:42 [PATCH] ARM: omap2: am437x: rollback to use omap3_gptimer_timer_init() Grygorii Strashko
2016-04-12 10:42 ` Grygorii Strashko
2016-04-12 16:01 ` Franklin S Cooper Jr.
2016-04-12 16:01   ` Franklin S Cooper Jr.
2016-04-12 16:05   ` Tony Lindgren
2016-04-12 16:05     ` Tony Lindgren
2016-04-12 16:04 ` Tony Lindgren [this message]
2016-04-12 16:04   ` Tony Lindgren
2016-04-12 18:30   ` Grygorii Strashko
2016-04-12 18:30     ` Grygorii Strashko
2016-04-12 18:42     ` Tony Lindgren
2016-04-12 18:42       ` Tony Lindgren
2016-05-25  9:53       ` Lokesh Vutla
2016-05-25  9:53         ` Lokesh Vutla
2016-05-25 12:44         ` Grygorii Strashko
2016-05-25 12:44           ` Grygorii Strashko

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