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Date: Wed, 25 Feb 2015 07:24:43 +0000
From: Lee Jones <lee.jones@...aro.org>
To: NeilBrown <neilb@...e.de>
Cc: Samuel Ortiz <sameo@...ux.intel.com>,
Tony Lindgren <tony@...mide.com>,
Sebastian Reichel <sre@...nel.org>,
Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
David Woodhouse <dwmw2@...radead.org>,
GTA04 owners <gta04-owner@...delico.com>,
linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-pm@...r.kernel.org
Subject: Re: [PATCH 04/15] twl4030_charger: use runtime_pm to keep usb phy
active while charging.
On Tue, 24 Feb 2015, NeilBrown wrote:
> The twl4030 usb phy needs to be active while we are using
> the USB VBUS as a current source for charging.
> In particular, the usb3v1 regulator must be enabled and the
> PHY_PWR_PHYPWD bit must be set to keep the phy powered.
>
> commit ab37813f4093a5f59cb8e083cde277289dc72ed3
> twl4030_charger: Allow charger to control the regulator that feeds it
>
> Gave the charger control over the regulator, but didn't resolve
> the PHY_PWR_PHYPWD issue.
>
> Now that both of these are controlled by runtime_pm in
> phy-twl4030-usb, we can simply take a runtime_pm reference to the USB
> phy whenever the charger wants to use it as a current source.
>
> So this patch reverts the above commit, and adds the necessary
> runtime_pm calls.
>
> Signed-off-by: NeilBrown <neilb@...e.de>
> ---
> drivers/mfd/twl-core.c | 9 ++++-----
Acked-by: Lee Jones <lee.jones@...aro.org>
> drivers/power/twl4030_charger.c | 18 +++++-------------
> 2 files changed, 9 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/mfd/twl-core.c b/drivers/mfd/twl-core.c
> index 489674a2497e..831696ee2472 100644
> --- a/drivers/mfd/twl-core.c
> +++ b/drivers/mfd/twl-core.c
> @@ -788,9 +788,8 @@ add_children(struct twl4030_platform_data *pdata, unsigned irq_base,
> static struct regulator_consumer_supply usb1v8 = {
> .supply = "usb1v8",
> };
> - static struct regulator_consumer_supply usb3v1[] = {
> - { .supply = "usb3v1" },
> - { .supply = "bci3v1" },
> + static struct regulator_consumer_supply usb3v1 = {
> + .supply = "usb3v1",
> };
>
> /* First add the regulators so that they can be used by transceiver */
> @@ -818,7 +817,7 @@ add_children(struct twl4030_platform_data *pdata, unsigned irq_base,
> return PTR_ERR(child);
>
> child = add_regulator_linked(TWL4030_REG_VUSB3V1,
> - &usb_fixed, usb3v1, 2,
> + &usb_fixed, &usb3v1, 1,
> features);
> if (IS_ERR(child))
> return PTR_ERR(child);
> @@ -838,7 +837,7 @@ add_children(struct twl4030_platform_data *pdata, unsigned irq_base,
> if (IS_ENABLED(CONFIG_REGULATOR_TWL4030) && child) {
> usb1v5.dev_name = dev_name(child);
> usb1v8.dev_name = dev_name(child);
> - usb3v1[0].dev_name = dev_name(child);
> + usb3v1.dev_name = dev_name(child);
> }
> }
>
> diff --git a/drivers/power/twl4030_charger.c b/drivers/power/twl4030_charger.c
> index 51321f0c5548..11f352a5ef55 100644
> --- a/drivers/power/twl4030_charger.c
> +++ b/drivers/power/twl4030_charger.c
> @@ -22,7 +22,6 @@
> #include <linux/power_supply.h>
> #include <linux/notifier.h>
> #include <linux/usb/otg.h>
> -#include <linux/regulator/machine.h>
>
> #define TWL4030_BCIMSTATEC 0x02
> #define TWL4030_BCIICHG 0x08
> @@ -94,7 +93,6 @@ struct twl4030_bci {
> struct work_struct work;
> int irq_chg;
> int irq_bci;
> - struct regulator *usb_reg;
> int usb_enabled;
>
> unsigned long event;
> @@ -208,7 +206,7 @@ static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
> {
> int ret;
>
> - if (enable) {
> + if (enable && !IS_ERR_OR_NULL(bci->transceiver)) {
> /* Check for USB charger connected */
> if (!twl4030_bci_have_vbus(bci))
> return -ENODEV;
> @@ -222,14 +220,9 @@ static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
> return -EACCES;
> }
>
> - /* Need to keep regulator on */
> + /* Need to keep phy powered */
> if (!bci->usb_enabled) {
> - ret = regulator_enable(bci->usb_reg);
> - if (ret) {
> - dev_err(bci->dev,
> - "Failed to enable regulator\n");
> - return ret;
> - }
> + pm_runtime_get_sync(bci->transceiver->dev);
> bci->usb_enabled = 1;
> }
>
> @@ -244,7 +237,8 @@ static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
> } else {
> ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0);
> if (bci->usb_enabled) {
> - regulator_disable(bci->usb_reg);
> + pm_runtime_mark_last_busy(bci->transceiver->dev);
> + pm_runtime_put_autosuspend(bci->transceiver->dev);
> bci->usb_enabled = 0;
> }
> }
> @@ -602,8 +596,6 @@ static int __init twl4030_bci_probe(struct platform_device *pdev)
> bci->usb.num_properties = ARRAY_SIZE(twl4030_charger_props);
> bci->usb.get_property = twl4030_bci_get_property;
>
> - bci->usb_reg = regulator_get(bci->dev, "bci3v1");
> -
> ret = devm_power_supply_register(&pdev->dev, &bci->usb);
> if (ret) {
> dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
>
>
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog
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