linux-kernel - Re: [PATCH 05/17] soc: ti: pruss: Configure SYSCFG properly during probe/remove

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Date:   Fri, 23 Nov 2018 08:26:04 -0800
From:   Tony Lindgren <tony@...mide.com>
To:     Roger Quadros <rogerq@...com>
Cc:     robh+dt@...nel.org, bcousson@...libre.com, ssantosh@...nel.org,
        ohad@...ery.com, bjorn.andersson@...aro.org, s-anna@...com,
        nsekhar@...com, t-kristo@...com, nsaulnier@...com, jreeder@...com,
        m-karicheri2@...com, woods.technical@...il.com,
        linux-omap@...r.kernel.org, linux-remoteproc@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH 05/17] soc: ti: pruss: Configure SYSCFG properly during
 probe/remove

* Roger Quadros <rogerq@...com> [181122 11:39]:
> +/* firmware must be idle when calling this function */
> +static void pruss_disable_module(struct device *dev)
> +{
> +	struct pruss_soc_bus *psoc_bus = dev_get_drvdata(dev);
> +
> +	/* configure Smart Standby */
> +	pruss_soc_bus_rmw(psoc_bus->syscfg, SYSCFG_STANDBY_MODE_MASK,
> +			  SYSCFG_STANDBY_MODE_SMART);
> +
> +	/* initiate MStandby */
> +	pruss_soc_bus_rmw(psoc_bus->syscfg, SYSCFG_STANDBY_INIT,
> +			  SYSCFG_STANDBY_INIT);
> +
> +	/* tell PRCM to initiate IDLE request */
> +	pm_runtime_put_sync(dev);
> +}
> +
> +static int pruss_enable_module(struct device *dev)
> +{
> +	struct pruss_soc_bus *psoc_bus = dev_get_drvdata(dev);
> +	int ret;
> +
> +	/* tell PRCM to de-assert IDLE request */
> +	ret = pm_runtime_get_sync(dev);
> +	if (ret < 0) {
> +		pm_runtime_put_noidle(dev);
> +		return ret;
> +	}
> +
> +	/* configure for Smart Idle & Smart Standby */
> +	pruss_soc_bus_rmw(psoc_bus->syscfg, SYSCFG_IDLE_MODE_MASK,
> +			  SYSCFG_IDLE_MODE_SMART);
> +	pruss_soc_bus_rmw(psoc_bus->syscfg, SYSCFG_STANDBY_MODE_MASK,
> +			  SYSCFG_STANDBY_MODE_SMART);
> +
> +	return ret;
> +}

Yeah so nothing PRU specific here, this you should be able to
handle in a generic way with drivers/bus/ti-sysc.c.

Regards,

Tony