linux-kernel - Re: [PATCHv1 5/6] HSI: Introduce OMAP SSI driver

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Message-ID: <20140224194257.GB11189@earth.universe>
Date:	Mon, 24 Feb 2014 20:42:59 +0100
From:	Sebastian Reichel <sre@...ian.org>
To:	Nishanth Menon <nm@...com>
Cc:	Mark Rutland <mark.rutland@....com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Shubhrajyoti Datta <omaplinuxkernel@...il.com>,
	Carlos Chinea <cch.devel@...il.com>,
	Tony Lindgren <tony@...mide.com>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	Pawel Moll <Pawel.Moll@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Rob Landley <rob@...dley.net>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	Pali Rohár <pali.rohar@...il.com>,
	Ивайло Димитров 
	<freemangordon@....bg>,
	Joni Lapilainen <joni.lapilainen@...il.com>,
	Aaro Koskinen <aaro.koskinen@....fi>
Subject: Re: [PATCHv1 5/6] HSI: Introduce OMAP SSI driver

On Mon, Feb 24, 2014 at 09:56:51AM -0600, Nishanth Menon wrote:
> On 02/24/2014 09:51 AM, Mark Rutland wrote:
> > On Sun, Feb 23, 2014 at 11:50:00PM +0000, Sebastian Reichel wrote:
> 
> [...]
> >> +static int omap_ssi_port_runtime_suspend(struct device *dev)
> >> +{
> >> +       struct hsi_port *port = dev_get_drvdata(dev);
> >> +       struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
> >> +       struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
> >> +       struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
> >> +
> >> +       dev_dbg(dev, "port runtime suspend!\n");
> >> +
> >> +       ssi_set_port_mode(omap_port, SSI_MODE_SLEEP);
> >> +       if (omap_ssi->get_loss)
> >> +               omap_port->loss_count =
> >> +                               (*omap_ssi->get_loss)(ssi->device.parent);
> > 
> > You don't need to do (*struct->func)(args) when invoking a function
> > pointer. You can jsut have struct->func(args) as we do elsewhere. This
> > can be:
> > 
> >   omap_ssi->get_loss(ssi->device.parent)
> > 
> > This should be fixed up in the other sites too.
> 
> in fact, we should stop expecting that service and drivers should
> manage their own context_loss detection
> Examples:
> MMC:
> http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=0a82e06e6183a252608df48cc4793b83e2d73dfd
> 
> DSS: http://marc.info/?l=linux-omap&m=139272358619064&w=2

I'm currently initializing get_loss as NULL, so context loss
detection is currently disabled. I will try to find a way to
detect context loss once the n900 modem is in a working state
in the mainline kernel.

For now I will keep the get_loss() with the changes requested
by Mark.

-- Sebastian

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