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Date: Tue, 1 Mar 2016 17:25:56 +0530 From: Kishon Vijay Abraham I <kishon@...com> To: Paul Walmsley <paul@...an.com> CC: Sekhar Nori <nsekhar@...com>, Suman Anna <s-anna@...com>, <d-gerlach@...com>, Tony Lindgren <tony@...mide.com>, Bjorn Helgaas <bhelgaas@...gle.com>, <richardcochran@...il.com>, Russell King <linux@....linux.org.uk>, <linux-omap@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org> Subject: Re: [PATCH v3 3/3] pci: dra7xx: use pdata callbacks to perform reset Hi, On Tuesday 01 March 2016 01:55 PM, Paul Walmsley wrote: > > Folks, the following is what I've queued for this. Thanks Paul. Bjorn, With this patch merged, enabling pci-dra7xx won't result in system freeze anymore. I can send a patch to revert depends on BROKEN. Thanks Kishon > > > - Paul > > > From: Sekhar Nori <nsekhar@...com> > Date: Thu, 18 Feb 2016 16:49:56 +0530 > Subject: [PATCH] ARM: DRA7: hwmod: Add custom reset handler for PCIeSS > > Add a custom reset handler for DRA7x PCIeSS. This > handler is required to deassert PCIe hardreset lines > after they have been asserted. > > This enables the PCIe driver to access registers after > PCIeSS has been runtime enabled without having to > deassert hardreset lines itself. > > With this patch applied, used lspci to make sure > connected PCIe device enumerates on DRA74x and DRA72x > EVMs. > > Signed-off-by: Sekhar Nori <nsekhar@...com> > Reported-by: Richard Cochran <richardcochran@...il.com> > Tested-by: Kishon Vijay Abraham I <kishon@...com> > Cc: Suman Anna <s-anna@...com> > Cc: Dave Gerlach <d-gerlach@...com> > Cc: Tony Lindgren <tony@...mide.com> > Cc: Bjorn Helgaas <bhelgaas@...gle.com> > Cc: Russell King <linux@....linux.org.uk> > Signed-off-by: Paul Walmsley <paul@...an.com> > --- > arch/arm/mach-omap2/omap_hwmod_7xx_data.c | 23 +++++++++++++++++++++++ > 1 file changed, 23 insertions(+) > > diff --git a/arch/arm/mach-omap2/omap_hwmod_7xx_data.c b/arch/arm/mach-omap2/omap_hwmod_7xx_data.c > index b61355e2a771..252b74633e31 100644 > --- a/arch/arm/mach-omap2/omap_hwmod_7xx_data.c > +++ b/arch/arm/mach-omap2/omap_hwmod_7xx_data.c > @@ -1526,8 +1526,31 @@ static struct omap_hwmod dra7xx_ocp2scp3_hwmod = { > * > */ > > +/* > + * As noted in documentation for _reset() in omap_hwmod.c, the stock reset > + * functionality of OMAP HWMOD layer does not deassert the hardreset lines > + * associated with an IP automatically leaving the driver to handle that > + * by itself. This does not work for PCIeSS which needs the reset lines > + * deasserted for the driver to start accessing registers. > + * > + * We use a PCIeSS HWMOD class specific reset handler to deassert the hardreset > + * lines after asserting them. > + */ > +static int dra7xx_pciess_reset(struct omap_hwmod *oh) > +{ > + int i; > + > + for (i = 0; i < oh->rst_lines_cnt; i++) { > + omap_hwmod_assert_hardreset(oh, oh->rst_lines[i].name); > + omap_hwmod_deassert_hardreset(oh, oh->rst_lines[i].name); > + } > + > + return 0; > +} > + > static struct omap_hwmod_class dra7xx_pciess_hwmod_class = { > .name = "pcie", > + .reset = dra7xx_pciess_reset, > }; > > /* pcie1 */ >
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