From: Paul Walmsley <paul@pwsan.com>
To: Suman Anna <s-anna@ti.com>
Cc: Kishon Vijay Abraham I <kishon@ti.com>,
Tony Lindgren <tony@atomide.com>,
Bjorn Helgaas <bhelgaas@google.com>,
richardcochran@gmail.com, Russell King <linux@arm.linux.org.uk>,
linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, nsekhar@ti.com
Subject: Re: [PATCH v3 3/3] pci: dra7xx: use pdata callbacks to perform reset
Date: Tue, 9 Feb 2016 08:49:13 +0000 (UTC) [thread overview]
Message-ID: <alpine.DEB.2.02.1602090846480.2906@utopia.booyaka.com> (raw)
In-Reply-To: <56B900E9.9040306@ti.com>
On Mon, 8 Feb 2016, Suman Anna wrote:
> On 02/07/2016 08:48 PM, Paul Walmsley wrote:
> > On Tue, 2 Feb 2016, Kishon Vijay Abraham I wrote:
> >
> >> Paul, what do you think is the best way forward to perform reset?
> >
> > Many of the IP blocks with PRM hardreset lines are processor IP blocks.
> > Those often need special reset handling to ensure that WFI/HLT-like
> > instructions are executed after reset. This special handling ensures that
> > the IP blocks' bus initiator interfaces indicate that they are in standby
> > to the PRCM - thus allowing power management for the rest of the chip to
> > work correctly.
> >
> > But that doesn't seem to be the case with PCIe - and maybe others -
> > possibly some of the MMUs?
>
> Yeah, the sequencing between clocks and resets would still be the same
> for MMUs, so, adding the custom flags for MMUs is fine.
I'm curious as to whether HWMOD_CUSTOM_HARDRESET is needed for the MMUs.
We've stated that the main point of the custom hardreset code is to handle
processors that need to be placed into WFI/HLT, but it doesn't seem like
there would be an equivalent for MMUs. Thoughts?
- Paul
next prev parent reply other threads:[~2016-02-09 8:49 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-14 14:11 [PATCH v3 0/3] dra7xx: get pcie working in mainline Kishon Vijay Abraham I
2016-01-14 14:11 ` [PATCH v3 1/3] ARM: DRA7: hwmod: Add reset data for PCIe Kishon Vijay Abraham I
2016-02-08 1:50 ` Paul Walmsley
2016-01-14 14:11 ` [PATCH v3 2/3] ARM: DRA7: add pdata-quirks to do reset of PCIe Kishon Vijay Abraham I
2016-01-15 19:19 ` Suman Anna
2016-01-15 19:22 ` Tony Lindgren
2016-01-15 19:41 ` Suman Anna
2016-01-18 9:12 ` Sekhar Nori
2016-01-27 17:23 ` Tony Lindgren
2016-01-14 14:11 ` [PATCH v3 3/3] pci: dra7xx: use pdata callbacks to perform reset Kishon Vijay Abraham I
2016-01-27 17:31 ` Tony Lindgren
2016-01-27 18:16 ` Suman Anna
2016-01-27 18:56 ` Tony Lindgren
2016-01-27 23:16 ` Suman Anna
2016-01-28 18:31 ` Tony Lindgren
2016-01-28 21:15 ` Suman Anna
2016-02-02 10:40 ` Kishon Vijay Abraham I
2016-02-05 4:19 ` Kishon Vijay Abraham I
2016-02-08 2:48 ` Paul Walmsley
2016-02-08 20:56 ` Suman Anna
2016-02-09 8:49 ` Paul Walmsley [this message]
2016-02-09 17:40 ` Suman Anna
2016-02-09 19:36 ` Paul Walmsley
2016-02-10 1:42 ` Suman Anna
2016-02-10 5:38 ` Kishon Vijay Abraham I
2016-02-11 19:27 ` Paul Walmsley
2016-02-11 22:04 ` Suman Anna
2016-02-12 6:49 ` Kishon Vijay Abraham I
2016-02-12 17:20 ` Suman Anna
2016-02-18 14:21 ` Sekhar Nori
2016-02-18 17:23 ` Paul Walmsley
2016-02-18 18:27 ` Suman Anna
2016-02-22 6:18 ` Kishon Vijay Abraham I
2016-02-22 6:31 ` Paul Walmsley
2016-02-22 9:55 ` Kishon Vijay Abraham I
2016-02-23 11:57 ` Kishon Vijay Abraham I
2016-02-23 18:28 ` Paul Walmsley
2016-02-24 6:21 ` Kishon Vijay Abraham I
2016-03-01 8:25 ` Paul Walmsley
2016-03-01 11:55 ` Kishon Vijay Abraham I
2016-03-01 14:43 ` Bjorn Helgaas
2016-03-01 16:55 ` Suman Anna
2016-02-11 20:43 ` Suman Anna
2016-02-12 6:55 ` Kishon Vijay Abraham I
2016-02-10 5:36 ` Kishon Vijay Abraham I
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