linux-kernel - Re: [RFC v2 1/8] video: tegra: Add nvhost driver

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Message-ID: <20121127105230.GD10090@sivaramn-lnx>
Date:	Tue, 27 Nov 2012 12:52:30 +0200
From:	Sivaram Nair <sivaramn@...dia.com>
To:	Terje Bergstrom <tbergstrom@...dia.com>
CC:	"thierry.reding@...onic-design.de" <thierry.reding@...onic-design.de>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC v2 1/8] video: tegra: Add nvhost driver

On Mon, Nov 26, 2012 at 02:19:07PM +0100, Terje Bergstrom wrote:
> +
> +struct nvhost_chip_support *nvhost_chip_ops;

should be static?

> +static int __devinit nvhost_alloc_resources(struct nvhost_master *host)
> +{
> +       int err;
> +
> +       err = nvhost_init_chip_support(host);
> +       if (err)
> +               return err;
> +
> +       return 0;

nit: why not just return err - the 'if(err)' is unnecessary)?

> +
> +       nvhost = host;

I think this should be delayed until the init is complete as this
variable is not cleared if there is a failure during init. Also I feel
that the name nvhost is a bit short for an exported variable.

> +static void to_state_running_locked(struct platform_device *dev)
> +{
> +       struct nvhost_device_data *pdata = platform_get_drvdata(dev);
> +       int prev_state = pdata->powerstate;
> +
> +       if (pdata->powerstate == NVHOST_POWER_STATE_POWERGATED)
> +               to_state_clockgated_locked(dev);
> +
> +       if (pdata->powerstate == NVHOST_POWER_STATE_CLOCKGATED) {
> +               int i;
> +
> +               if (dev->dev.parent)
> +                       nvhost_module_busy(to_platform_device(dev->dev.parent));
> +
> +               for (i = 0; i < pdata->num_clks; i++) {
> +                       int err = clk_prepare_enable(pdata->clk[i]);
> +                       if (err) {
> +                               dev_err(&dev->dev, "Cannot turn on clock %s",
> +                                       pdata->clocks[i].name);
> +                               return;

In case of an error, returning here leaves some clocks turned on. 

Sivaram
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