From: Paul Walmsley <paul@pwsan.com>
To: "Cousson, Benoit" <b-cousson@ti.com>
Cc: Tony Lindgren <tony@atomide.com>,
balbi@ti.com, linux-omap@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
Tero Kristo <t-kristo@ti.com>, Ohad Ben-Cohen <ohad@wizery.com>
Subject: Re: [PATCH 04/11] ARM: OMAP2+: usb_host_fs: add custom reset for usb_host_fs (fsusb)
Date: Mon, 11 Jun 2012 10:20:02 -0600 (MDT) [thread overview]
Message-ID: <alpine.DEB.2.00.1206111011230.5849@utopia.booyaka.com> (raw)
In-Reply-To: <4FD5B951.7010607@ti.com>
On Mon, 11 Jun 2012, Cousson, Benoit wrote:
> On 6/11/2012 10:04 AM, Paul Walmsley wrote:
>
> > But if the IP blocks are reset later, and the bootloader or previous OS
> > gets some register settings wrong, there's a greater risk of system
> > instability or unpredictable behavior during the boot process.
>
> Mmm, I'm not convince by that. If we delay the PM init at the very last
> time, at least after the modules are properly reset and init, I do not
> think we will have more issues than today.
My intent was not to convince, but to explain.
Certainly back in the OMAP3 days there were bootloaders that got SDRAM and
GPMC timings wrong. No way did I want to be chasing down kernel "bugs"
based on those.
Anyway, once people finish fixing the drivers, then we should be able to
switch to late hwmod reset.
- Paul
WARNING: multiple messages have this Message-ID (diff)
From: paul@pwsan.com (Paul Walmsley)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 04/11] ARM: OMAP2+: usb_host_fs: add custom reset for usb_host_fs (fsusb)
Date: Mon, 11 Jun 2012 10:20:02 -0600 (MDT) [thread overview]
Message-ID: <alpine.DEB.2.00.1206111011230.5849@utopia.booyaka.com> (raw)
In-Reply-To: <4FD5B951.7010607@ti.com>
On Mon, 11 Jun 2012, Cousson, Benoit wrote:
> On 6/11/2012 10:04 AM, Paul Walmsley wrote:
>
> > But if the IP blocks are reset later, and the bootloader or previous OS
> > gets some register settings wrong, there's a greater risk of system
> > instability or unpredictable behavior during the boot process.
>
> Mmm, I'm not convince by that. If we delay the PM init at the very last
> time, at least after the modules are properly reset and init, I do not
> think we will have more issues than today.
My intent was not to convince, but to explain.
Certainly back in the OMAP3 days there were bootloaders that got SDRAM and
GPMC timings wrong. No way did I want to be chasing down kernel "bugs"
based on those.
Anyway, once people finish fixing the drivers, then we should be able to
switch to late hwmod reset.
- Paul
next prev parent reply other threads:[~2012-06-11 16:20 UTC|newest]
Thread overview: 120+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-07 6:13 [PATCH 00/11] ARM: OMAP: core/hwmod: first set of fixes for 3.5-rc Paul Walmsley
2012-06-07 6:13 ` Paul Walmsley
2012-06-07 6:13 ` [PATCH 01/11] ARM: OMAP2+: hwmod: add setup_preprogram hook Paul Walmsley
2012-06-07 6:13 ` Paul Walmsley
2012-06-07 6:13 ` [PATCH 02/11] ARM: OMAP4+: AESS: enable internal auto-gating during initial setup Paul Walmsley
2012-06-07 6:13 ` Paul Walmsley
2012-06-07 7:19 ` Tony Lindgren
2012-06-07 7:19 ` Tony Lindgren
2012-06-07 7:31 ` Paul Walmsley
2012-06-07 7:31 ` Paul Walmsley
2012-06-07 7:48 ` Tony Lindgren
2012-06-07 7:48 ` Tony Lindgren
2012-06-07 10:45 ` Paul Walmsley
2012-06-07 10:45 ` Paul Walmsley
2012-06-07 11:08 ` Tony Lindgren
2012-06-07 11:08 ` Tony Lindgren
2012-06-07 6:13 ` [PATCH 03/11] ARM: OMAP4: hwmod data: add SL2IF hardreset line Paul Walmsley
2012-06-07 6:13 ` Paul Walmsley
2012-06-07 6:13 ` [PATCH 04/11] ARM: OMAP2+: usb_host_fs: add custom reset for usb_host_fs (fsusb) Paul Walmsley
2012-06-07 6:13 ` Paul Walmsley
2012-06-07 7:31 ` Tony Lindgren
2012-06-07 7:31 ` Tony Lindgren
2012-06-07 7:33 ` Felipe Balbi
2012-06-07 7:33 ` Felipe Balbi
2012-06-07 8:00 ` Tony Lindgren
2012-06-07 8:00 ` Tony Lindgren
2012-06-07 7:40 ` Paul Walmsley
2012-06-07 7:40 ` Paul Walmsley
2012-06-07 7:51 ` Tony Lindgren
2012-06-07 7:51 ` Tony Lindgren
2012-06-07 7:55 ` Felipe Balbi
2012-06-07 7:55 ` Felipe Balbi
2012-06-07 8:02 ` Cousson, Benoit
2012-06-07 8:02 ` Cousson, Benoit
2012-06-07 8:10 ` Tony Lindgren
2012-06-07 8:10 ` Tony Lindgren
2012-06-07 8:14 ` Felipe Balbi
2012-06-07 8:14 ` Felipe Balbi
2012-06-07 10:52 ` Paul Walmsley
2012-06-07 10:52 ` Paul Walmsley
2012-06-07 12:30 ` Cousson, Benoit
2012-06-07 12:30 ` Cousson, Benoit
2012-06-08 1:11 ` Paul Walmsley
2012-06-08 1:11 ` Paul Walmsley
2012-06-08 13:13 ` Cousson, Benoit
2012-06-08 13:13 ` Cousson, Benoit
2012-06-08 13:28 ` Paul Walmsley
2012-06-08 13:28 ` Paul Walmsley
2012-06-08 19:32 ` Hiremath, Vaibhav
2012-06-08 19:32 ` Hiremath, Vaibhav
2012-06-08 23:10 ` AM335x CPSW reset (was "RE: [PATCH 04/11] ARM: OMAP2+: usb_host_fs: add custom reset for usb_host_fs (fsusb)") Paul Walmsley
2012-06-08 23:10 ` Paul Walmsley
2012-06-09 8:39 ` Hiremath, Vaibhav
2012-06-09 8:39 ` Hiremath, Vaibhav
2012-06-09 16:05 ` Paul Walmsley
2012-06-09 16:05 ` Paul Walmsley
2012-06-11 6:15 ` [PATCH 04/11] ARM: OMAP2+: usb_host_fs: add custom reset for usb_host_fs (fsusb) Tony Lindgren
2012-06-11 6:15 ` Tony Lindgren
2012-06-11 8:04 ` Paul Walmsley
2012-06-11 8:04 ` Paul Walmsley
2012-06-11 9:24 ` Cousson, Benoit
2012-06-11 9:24 ` Cousson, Benoit
2012-06-11 16:20 ` Paul Walmsley [this message]
2012-06-11 16:20 ` Paul Walmsley
2012-06-07 10:20 ` Paul Walmsley
2012-06-07 10:20 ` Paul Walmsley
2012-06-07 10:52 ` Tony Lindgren
2012-06-07 10:52 ` Tony Lindgren
2012-06-07 22:05 ` Paul Walmsley
2012-06-07 22:05 ` Paul Walmsley
2012-06-08 6:38 ` Tony Lindgren
2012-06-08 6:38 ` Tony Lindgren
2012-06-09 1:31 ` Paul Walmsley
2012-06-09 1:31 ` Paul Walmsley
2012-06-11 6:21 ` Tony Lindgren
2012-06-11 6:21 ` Tony Lindgren
2012-06-07 6:13 ` [PATCH 05/11] ARM: OMAP2+: hwmod code/data: fix 32K sync timer Paul Walmsley
2012-06-07 6:13 ` Paul Walmsley
2012-06-07 6:59 ` Hiremath, Vaibhav
2012-06-07 6:59 ` Hiremath, Vaibhav
2012-06-07 7:08 ` Paul Walmsley
2012-06-07 7:08 ` Paul Walmsley
2012-06-07 18:09 ` Hiremath, Vaibhav
2012-06-07 18:09 ` Hiremath, Vaibhav
2012-06-07 20:03 ` Paul Walmsley
2012-06-07 20:03 ` Paul Walmsley
2012-06-08 19:10 ` Hiremath, Vaibhav
2012-06-08 19:10 ` Hiremath, Vaibhav
2012-06-11 9:12 ` Cousson, Benoit
2012-06-11 9:12 ` Cousson, Benoit
2012-06-08 13:22 ` Tero Kristo
2012-06-08 13:22 ` Tero Kristo
2012-06-08 23:18 ` Paul Walmsley
2012-06-08 23:18 ` Paul Walmsley
2012-06-07 6:13 ` [PATCH 06/11] ARM: OMAP4+: hwmod: fix issue causing IPs not going back to Smart-Standby Paul Walmsley
2012-06-07 6:13 ` Paul Walmsley
2012-06-07 6:13 ` [PATCH 07/11] ARM: OMAP: PM: Lock clocks list while generating summary Paul Walmsley
2012-06-07 6:13 ` Paul Walmsley
2012-06-07 6:13 ` [PATCH 08/11] ARM: OMAP2+: CM: increase the module disable timeout Paul Walmsley
2012-06-07 6:13 ` Paul Walmsley
2012-06-07 6:13 ` [PATCH 10/11] ARM: OMAP2+: hwmod: add flag to prevent hwmod code from touching IP block during init Paul Walmsley
2012-06-07 6:13 ` Paul Walmsley
2012-06-07 6:13 ` [PATCH 09/11] ARM: OMAP4: clock data: add clockdomains for clocks used as main clocks Paul Walmsley
2012-06-07 6:13 ` Paul Walmsley
2012-06-07 6:39 ` Rajendra Nayak
2012-06-07 6:39 ` Rajendra Nayak
2012-06-18 17:41 ` Paul Walmsley
2012-06-18 17:41 ` Paul Walmsley
2012-06-19 5:15 ` Rajendra Nayak
2012-06-19 5:15 ` Rajendra Nayak
2012-06-07 6:13 ` [PATCH 11/11] ARM: OMAP4: hwmod data: do not enable or reset the McPDM during kernel init Paul Walmsley
2012-06-07 6:13 ` Paul Walmsley
2012-06-08 13:30 ` [PATCH 00/11] ARM: OMAP: core/hwmod: first set of fixes for 3.5-rc Tero Kristo
2012-06-08 13:30 ` Tero Kristo
2012-06-09 1:15 ` Paul Walmsley
2012-06-09 1:15 ` Paul Walmsley
2012-06-13 23:55 ` Paul Walmsley
2012-06-13 23:55 ` Paul Walmsley
2012-06-14 7:36 ` Tero Kristo
2012-06-14 7:36 ` Tero Kristo
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