From: "Cousson, Benoit" <b-cousson@ti.com> To: Paul Walmsley <paul@pwsan.com> Cc: balbi@ti.com, Tony Lindgren <tony@atomide.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: Thu, 7 Jun 2012 14:30:50 +0200 [thread overview] Message-ID: <4FD09EFA.20304@ti.com> (raw) In-Reply-To: <alpine.DEB.2.00.1206070446070.6684@utopia.booyaka.com> + Ohad On 6/7/2012 12:52 PM, Paul Walmsley wrote: > On Thu, 7 Jun 2012, Cousson, Benoit wrote: > >> In fact we should delay the reset to the very last moment and >> potentially reset the IPs not under driver control later after a couple >> of second for example. It will avoid reseting every IP that will be >> handled properly by drivers. > > We discussed this a couple of years ago on the list and aligned on late > and lazy resets, from my recollection. Indeed, what I did not mention is that potentially the whole device init should be done ondemand as well. Meaning the whole hwmod setup phase should be done only when the driver will probe the device. > The main reason why it wasn't > implemented was because there were some drivers that were not yet PM > runtime-converted. This would have caused crashes, since the core code > would have no idea that the non-PM-runtime drivers had initialized their > devices, and so the core just went ahead and reset those anyway. > > It might actually be safe now to switch to the late reset arrangement, > depending on whether the rest of the drivers have been PM > runtime-converted by now. > > Of course, it would all be moot if the reset is moved away from the hwmod > code into the drivers. I do think that moving that to driver code seems much better since all these customs reset code (I2C, DSS, USB...) does anyway require access to the device itself. The is driver responsibility to do that. So ideally it should not be in OMAP architecture code. Regards, Benoit
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From: b-cousson@ti.com (Cousson, Benoit) 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: Thu, 7 Jun 2012 14:30:50 +0200 [thread overview] Message-ID: <4FD09EFA.20304@ti.com> (raw) In-Reply-To: <alpine.DEB.2.00.1206070446070.6684@utopia.booyaka.com> + Ohad On 6/7/2012 12:52 PM, Paul Walmsley wrote: > On Thu, 7 Jun 2012, Cousson, Benoit wrote: > >> In fact we should delay the reset to the very last moment and >> potentially reset the IPs not under driver control later after a couple >> of second for example. It will avoid reseting every IP that will be >> handled properly by drivers. > > We discussed this a couple of years ago on the list and aligned on late > and lazy resets, from my recollection. Indeed, what I did not mention is that potentially the whole device init should be done ondemand as well. Meaning the whole hwmod setup phase should be done only when the driver will probe the device. > The main reason why it wasn't > implemented was because there were some drivers that were not yet PM > runtime-converted. This would have caused crashes, since the core code > would have no idea that the non-PM-runtime drivers had initialized their > devices, and so the core just went ahead and reset those anyway. > > It might actually be safe now to switch to the late reset arrangement, > depending on whether the rest of the drivers have been PM > runtime-converted by now. > > Of course, it would all be moot if the reset is moved away from the hwmod > code into the drivers. I do think that moving that to driver code seems much better since all these customs reset code (I2C, DSS, USB...) does anyway require access to the device itself. The is driver responsibility to do that. So ideally it should not be in OMAP architecture code. Regards, Benoit
next prev parent reply other threads:[~2012-06-07 12:30 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 [this message] 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 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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