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Date: Tue, 06 Jan 2015 19:12:42 +0100
From: Gregory CLEMENT <gregory.clement@...e-electrons.com>
To: Hans de Goede <hdegoede@...hat.com>
CC: Tejun Heo <tj@...nel.org>, linux-ide@...r.kernel.org,
linux-kernel@...r.kernel.org,
Antoine Ténart
<antoine.tenart@...e-electrons.com>,
Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
Maxime Ripard <maxime.ripard@...e-electrons.com>,
Boris BREZILLON <boris.brezillon@...e-electrons.com>,
Lior Amsalem <alior@...vell.com>,
Tawfik Bayouk <tawfik@...vell.com>,
Nadav Haklai <nadavh@...vell.com>,
Mark Rutland <mark.rutland@....com>, devicetree@...r.kernel.org
Subject: Re: [PATCH 3/3] ata: libahci: Allow to use multiple regulators
Hi Hans,
On 27/12/2014 13:58, Hans de Goede wrote:
> Hi Gregory,
>
> Thanks for working on this. Overall the patch-set / concept looks good,
> you can add "Acked-by: Hans de Goede <hdegoede@...hat.com>" to the first
> 2 patches.
Thanks for your review. About the second patch as the change in the regulator
framework didn't have been accepted, I had to change the binding. I will send
a the new binding in the next version.
>
> I've some comments on this patch, see below.
>
[...]
>> +int ahci_platform_enable_regulators(struct ahci_host_priv *hpriv)
>> +{
>> + int rc, i;
>> +
>> + for (i = 0; i < hpriv->nports; i++) {
>> + if (!hpriv->target_pwrs[i])
>> + continue;
>> +
>> + rc = regulator_enable(hpriv->target_pwrs[i]);
>> + if (rc)
>> + goto disable_target_pwrs;
>> + }
>> +
>> + return 0;
>> +
>> +disable_target_pwrs:
>> + while (--i >= 0)
>> + if (!hpriv->target_pwrs[i])
>
> I'm pretty sure you want:
>
> if (hpriv->target_pwrs[i])
>
> here, so without the '!' .
>
>> + regulator_disable(hpriv->target_pwrs[i]);
yes you're right.
>> +
>> + return rc;
>> +}
>> +EXPORT_SYMBOL_GPL(ahci_platform_enable_regulators);
>> +
>> +/**
>> + * ahci_platform_disable_regulators - Disable regulators
>> + * @hpriv: host private area to store config values
>> + *
>> + * This function disables all regulators found in hpriv->target_pwrs.
>> + */
>> +void ahci_platform_disable_regulators(struct ahci_host_priv *hpriv)
>> +{
>> + int i;
>> +
>> + for (i = 0; i < hpriv->nports; i++) {
>> + if (!hpriv->target_pwrs[i])
>> + continue;
>> + regulator_disable(hpriv->target_pwrs[i]);
>> + }
>> +}
>> +EXPORT_SYMBOL_GPL(ahci_platform_disable_regulators);
>> +/**
>> * ahci_platform_enable_resources - Enable platform resources
>> * @hpriv: host private area to store config values
>> *
>> @@ -157,11 +210,9 @@ int ahci_platform_enable_resources(struct ahci_host_priv *hpriv)
>> {
>> int rc;
>>
>> - if (hpriv->target_pwr) {
>> - rc = regulator_enable(hpriv->target_pwr);
>> - if (rc)
>> - return rc;
>> - }
>> + rc = ahci_platform_enable_regulators(hpriv);
>> + if (rc)
>> + return rc;
>>
>> rc = ahci_platform_enable_clks(hpriv);
>> if (rc)
>> @@ -177,8 +228,8 @@ disable_clks:
>> ahci_platform_disable_clks(hpriv);
>>
>> disable_regulator:
>> - if (hpriv->target_pwr)
>> - regulator_disable(hpriv->target_pwr);
>> + ahci_platform_disable_regulators(hpriv);
>> +
>> return rc;
>> }
>> EXPORT_SYMBOL_GPL(ahci_platform_enable_resources);
>> @@ -199,8 +250,7 @@ void ahci_platform_disable_resources(struct ahci_host_priv *hpriv)
>>
>> ahci_platform_disable_clks(hpriv);
>>
>> - if (hpriv->target_pwr)
>> - regulator_disable(hpriv->target_pwr);
>> + ahci_platform_disable_regulators(hpriv);
>> }
>> EXPORT_SYMBOL_GPL(ahci_platform_disable_resources);
>>
>> @@ -218,6 +268,59 @@ static void ahci_platform_put_resources(struct device *dev, void *res)
>> clk_put(hpriv->clks[c]);
>> }
>>
>> +static int ahci_platform_get_phy(struct ahci_host_priv *hpriv, u32 port,
>> + struct device *dev, struct device_node *node)
>> +{
>> + int rc;
>> +
>> + hpriv->phys[port] = devm_of_phy_get(dev, node, NULL);
>> +
>> + if (!IS_ERR(hpriv->phys[port]))
>> + return 0;
>> +
>> + rc = PTR_ERR(hpriv->phys[port]);
>> + switch (rc) {
>> + case -ENOSYS:
>> + /* No PHY support. Check if PHY is required. */
>> + if (of_find_property(node, "phys", NULL)) {
>> + dev_err(dev,
>> + "couldn't get PHY in node %s: ENOSYS\n",
>> + node->name);
>> + break;
>> + }
>> + case -ENODEV:
>> + /* continue normally */
>> + hpriv->phys[port] = NULL;
>> + rc = 0;
>> + break;
>> +
>> + default:
>> + dev_err(dev,
>> + "couldn't get PHY in node %s: %d\n",
>> + node->name, rc);
>> +
>> + break;
>> + }
>> +
>> + return rc;
>> +}
>> +
>> +static int ahci_platform_get_regulator(struct ahci_host_priv *hpriv, u32 port,
>> + struct device *dev, struct device_node *node)
>> +{
>> + struct regulator *target_pwr;
>> + int rc = 0;
>> +
>> + target_pwr = devm_of_regulator_get_optional(dev, "target", node);
>> +
>> + if (!IS_ERR(target_pwr))
>> + hpriv->target_pwrs[port] = target_pwr;
>> + else
>> + rc = PTR_ERR(target_pwr);
>> +
>> + return rc;
>> +}
>> +
>> /**
>> * ahci_platform_get_resources - Get platform resources
>> * @pdev: platform device to get resources for
>> @@ -240,7 +343,7 @@ struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev)
>> struct ahci_host_priv *hpriv;
>> struct clk *clk;
>> struct device_node *child;
>> - int i, enabled_ports = 0, rc = -ENOMEM;
>> + int i, sz, enabled_ports = 0, rc = -ENOMEM;
>> u32 mask_port_map = 0;
>>
>> if (!devres_open_group(dev, NULL, GFP_KERNEL))
>> @@ -261,14 +364,6 @@ struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev)
>> goto err_out;
>> }
>>
>> - hpriv->target_pwr = devm_regulator_get_optional(dev, "target");
>> - if (IS_ERR(hpriv->target_pwr)) {
>> - rc = PTR_ERR(hpriv->target_pwr);
>> - if (rc == -EPROBE_DEFER)
>> - goto err_out;
>> - hpriv->target_pwr = NULL;
>> - }
>> -
>> for (i = 0; i < AHCI_MAX_CLKS; i++) {
>> /*
>> * For now we must use clk_get(dev, NULL) for the first clock,
>> @@ -292,15 +387,24 @@ struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev)
>>
>> hpriv->nports = of_get_child_count(dev->of_node);
>>
>> - if (hpriv->nports) {
>> - hpriv->phys = devm_kzalloc(dev,
>> - hpriv->nports * sizeof(*hpriv->phys),
>> - GFP_KERNEL);
>> - if (!hpriv->phys) {
>> - rc = -ENOMEM;
>> - goto err_out;
>> - }
>> + /* If no sub-node was found, keep this for device tree compatibility */
>> + if (!hpriv->nports)
>> + hpriv->nports = 1;
>
> So now nports is always >= 1.
>
>> +
>> + sz = hpriv->nports * sizeof(*hpriv->phys);
>> + hpriv->phys = devm_kzalloc(dev, sz, GFP_KERNEL);
>> + if (!hpriv->phys) {
>> + rc = -ENOMEM;
>> + goto err_out;
>> + }
>> + sz = hpriv->nports * sizeof(*hpriv->target_pwrs);
>> + hpriv->target_pwrs = devm_kzalloc(dev, sz, GFP_KERNEL);
>> + if (!hpriv->target_pwrs) {
>> + rc = -ENOMEM;
>> + goto err_out;
>> + }
>>
>> + if (hpriv->nports) {
>
> And this is always true,
>
>> for_each_child_of_node(dev->of_node, child) {
>> u32 port;
>>
>> @@ -319,14 +423,14 @@ struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev)
>>
>> mask_port_map |= BIT(port);
>>
>> - hpriv->phys[port] = devm_of_phy_get(dev, child, NULL);
>> - if (IS_ERR(hpriv->phys[port])) {
>> - rc = PTR_ERR(hpriv->phys[port]);
>> - dev_err(dev,
>> - "couldn't get PHY in node %s: %d\n",
>> - child->name, rc);
>> + rc = ahci_platform_get_regulator(hpriv, port,
>> + dev, child);
>> + if (rc == -EPROBE_DEFER)
>> + goto err_out;
>> +
>> + rc = ahci_platform_get_phy(hpriv, port, dev, child);
>> + if (rc)
>> goto err_out;
>> - }
>>
>> enabled_ports++;
>> }
>> @@ -343,38 +447,14 @@ struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev)
>> * If no sub-node was found, keep this for device tree
>> * compatibility
>> */
>
> And thus the code below (which is in the else) never gets executed, and you've
> broken the case where there are no subnodes.
>
> I think it is best to fix this by keeping nports == 0 when there are no subnodes
> (because we really do not know nports then, so advertising 1 is sorta wrong anyways),
You are definitely right
> and use something like this to calculate the array sizes:
>
> sz = (nports ? nports : 1) * sizeof(*hpriv->phys);
> ...
> sz = (nports ? nports : 1) * sizeof(*hpriv->target_pwrs);
I will do it.
Thanks again for your review,
Gregory
--
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
--
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