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Wysocki" , Ulf Hansson Subject: [PATCH] pinctrl: Enforce device links Date: Fri, 13 Dec 2019 14:20:43 +0100 Message-Id: <20191213132043.20806-1-linus.walleij@linaro.org> X-Mailer: git-send-email 2.23.0 MIME-Version: 1.0 Sender: linux-gpio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org 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 Cc: Rafael J. Wysocki Cc: Ulf Hansson Signed-off-by: Linus Walleij --- 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! --- drivers/pinctrl/core.c | 35 +++++++++++++++++---------- drivers/pinctrl/core.h | 3 +++ drivers/pinctrl/pinctrl-stmfx.c | 1 - drivers/pinctrl/stm32/pinctrl-stm32.c | 1 - include/linux/pinctrl/pinctrl.h | 5 ---- 5 files changed, 25 insertions(+), 20 deletions(-) -- 2.23.0 diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c index 2bbd8ee93507..89ac42a145f2 100644 --- a/drivers/pinctrl/core.c +++ b/drivers/pinctrl/core.c @@ -1000,6 +1000,26 @@ 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; } @@ -1135,6 +1155,8 @@ 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) @@ -1220,15 +1242,6 @@ 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 @@ -1274,10 +1287,6 @@ 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 7f34167a0405..4073a1e4dde1 100644 --- a/drivers/pinctrl/core.h +++ b/drivers/pinctrl/core.h @@ -11,6 +11,7 @@ #include #include #include +#include #include #include @@ -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 16723797fa7c..4306b8444188 100644 --- a/drivers/pinctrl/pinctrl-stmfx.c +++ b/drivers/pinctrl/pinctrl-stmfx.c @@ -638,7 +638,6 @@ 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 2d5e0435af0a..ec59a58600ce 100644 --- a/drivers/pinctrl/stm32/pinctrl-stm32.c +++ b/drivers/pinctrl/stm32/pinctrl-stm32.c @@ -1439,7 +1439,6 @@ 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 7ce23450a1cb..c6159f041f4e 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 */