diff options
author | Linus Walleij <linus.walleij@linaro.org> | 2019-12-12 11:05:37 +0100 |
---|---|---|
committer | Linus Walleij <linus.walleij@linaro.org> | 2020-04-16 09:37:51 +0200 |
commit | 73441cf773ed91bff0e7f66614d391b2514188bf (patch) | |
tree | 0fabedc3c5af57cc023a8cfd2bf822c91f8b2924 | |
parent | 8f3d9f354286745c751374f5f1fcafee6b3f3136 (diff) | |
download | linux-pinctrl-consumer-link-enforce.tar.gz |
pinctrl: Enforce device linksconsumer-link-enforce
Instead of opt-in device links, enforce it across the board.
Everyone probably needs this anyway, lest runtime[_pm] suspend
order will be haphazard.
Cc: Benjamin GAIGNARD <benjamin.gaignard@st.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
ChangeLog v1->v2:
- Create links per setting (since settings can be on different
pin controllers) when adding a setting to a pin control handle,
instead of doing this when activating the state.
- Store the link inside the setting.
- Delete the link when we free up the setting.
Benjamin: it would be GREAT if you could test this!
-rw-r--r-- | drivers/pinctrl/core.c | 35 | ||||
-rw-r--r-- | drivers/pinctrl/core.h | 3 | ||||
-rw-r--r-- | drivers/pinctrl/pinctrl-stmfx.c | 1 | ||||
-rw-r--r-- | drivers/pinctrl/stm32/pinctrl-stm32.c | 1 | ||||
-rw-r--r-- | include/linux/pinctrl/pinctrl.h | 5 |
5 files changed, 25 insertions, 20 deletions
diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c index 821242bb4b16a..09eb022074064 100644 --- a/drivers/pinctrl/core.c +++ b/drivers/pinctrl/core.c @@ -1001,6 +1001,26 @@ static int add_setting(struct pinctrl *p, struct pinctrl_dev *pctldev, list_add_tail(&setting->node, &state->settings); + /* + * Set up a device link for power management. + * Do not link hogs (circular dependency) + * Do not create more than one link per pinctrl. + */ + if (p->dev != setting->pctldev->dev) { + /* + * Create a device link to the consumer such that + * it will enforce that runtime PM suspend/resume + * is done first on consumers before we get to + * the pin controller itself. As some devices get + * their pin control state even before probe() it is + * important to use DL_FLAG_AUTOREMOVE_CONSUMER. + */ + setting->dl = device_link_add(p->dev, + setting->pctldev->dev, + DL_FLAG_PM_RUNTIME | + DL_FLAG_AUTOREMOVE_CONSUMER); + } + return 0; } @@ -1136,6 +1156,8 @@ EXPORT_SYMBOL_GPL(pinctrl_get); static void pinctrl_free_setting(bool disable_setting, struct pinctrl_setting *setting) { + if (setting->dl) + device_link_del(setting->dl); switch (setting->type) { case PIN_MAP_TYPE_MUX_GROUP: if (disable_setting) @@ -1221,15 +1243,6 @@ struct pinctrl_state *pinctrl_lookup_state(struct pinctrl *p, } EXPORT_SYMBOL_GPL(pinctrl_lookup_state); -static void pinctrl_link_add(struct pinctrl_dev *pctldev, - struct device *consumer) -{ - if (pctldev->desc->link_consumers) - device_link_add(consumer, pctldev->dev, - DL_FLAG_PM_RUNTIME | - DL_FLAG_AUTOREMOVE_CONSUMER); -} - /** * pinctrl_commit_state() - select/activate/program a pinctrl state to HW * @p: the pinctrl handle for the device that requests configuration @@ -1275,10 +1288,6 @@ static int pinctrl_commit_state(struct pinctrl *p, struct pinctrl_state *state) if (ret < 0) { goto unapply_new_state; } - - /* Do not link hogs (circular dependency) */ - if (p != setting->pctldev->p) - pinctrl_link_add(setting->pctldev, p->dev); } p->state = state; diff --git a/drivers/pinctrl/core.h b/drivers/pinctrl/core.h index 840103c40c14a..f8f45ce7c599b 100644 --- a/drivers/pinctrl/core.h +++ b/drivers/pinctrl/core.h @@ -11,6 +11,7 @@ #include <linux/kref.h> #include <linux/mutex.h> #include <linux/radix-tree.h> +#include <linux/device.h> #include <linux/pinctrl/pinconf.h> #include <linux/pinctrl/machine.h> @@ -126,6 +127,7 @@ struct pinctrl_setting_configs { * @pctldev: pin control device handling to be programmed. Not used for * PIN_MAP_TYPE_DUMMY_STATE. * @dev_name: the name of the device using this state + * @dl: device link for power management * @data: Data specific to the setting type */ struct pinctrl_setting { @@ -133,6 +135,7 @@ struct pinctrl_setting { enum pinctrl_map_type type; struct pinctrl_dev *pctldev; const char *dev_name; + struct device_link *dl; union { struct pinctrl_setting_mux mux; struct pinctrl_setting_configs configs; diff --git a/drivers/pinctrl/pinctrl-stmfx.c b/drivers/pinctrl/pinctrl-stmfx.c index 60100b45f5e5e..77441edf887ea 100644 --- a/drivers/pinctrl/pinctrl-stmfx.c +++ b/drivers/pinctrl/pinctrl-stmfx.c @@ -649,7 +649,6 @@ static int stmfx_pinctrl_probe(struct platform_device *pdev) pctl->pctl_desc.pins = stmfx_pins; pctl->pctl_desc.npins = ARRAY_SIZE(stmfx_pins); pctl->pctl_desc.owner = THIS_MODULE; - pctl->pctl_desc.link_consumers = true; ret = devm_pinctrl_register_and_init(pctl->dev, &pctl->pctl_desc, pctl, &pctl->pctl_dev); diff --git a/drivers/pinctrl/stm32/pinctrl-stm32.c b/drivers/pinctrl/stm32/pinctrl-stm32.c index a657cd829ce6a..459f33cd04e93 100644 --- a/drivers/pinctrl/stm32/pinctrl-stm32.c +++ b/drivers/pinctrl/stm32/pinctrl-stm32.c @@ -1490,7 +1490,6 @@ int stm32_pctl_probe(struct platform_device *pdev) pctl->pctl_desc.owner = THIS_MODULE; pctl->pctl_desc.pins = pins; pctl->pctl_desc.npins = pctl->npins; - pctl->pctl_desc.link_consumers = true; pctl->pctl_desc.confops = &stm32_pconf_ops; pctl->pctl_desc.pctlops = &stm32_pctrl_ops; pctl->pctl_desc.pmxops = &stm32_pmx_ops; diff --git a/include/linux/pinctrl/pinctrl.h b/include/linux/pinctrl/pinctrl.h index 2aef59df93d70..01926351bce18 100644 --- a/include/linux/pinctrl/pinctrl.h +++ b/include/linux/pinctrl/pinctrl.h @@ -122,10 +122,6 @@ struct pinctrl_ops { * the hardware description * @custom_conf_items: Information how to print @params in debugfs, must be * the same size as the @custom_params, i.e. @num_custom_params - * @link_consumers: If true create a device link between pinctrl and its - * consumers (i.e. the devices requesting pin control states). This is - * sometimes necessary to ascertain the right suspend/resume order for - * example. */ struct pinctrl_desc { const char *name; @@ -140,7 +136,6 @@ struct pinctrl_desc { const struct pinconf_generic_params *custom_params; const struct pin_config_item *custom_conf_items; #endif - bool link_consumers; }; /* External interface to pin controller */ |