linux-kernel - [PATCH 06/20] usb/chipidea: core: Use pm

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Date:   Thu,  3 Sep 2020 13:25:40 +0200
From:   Paul Cercueil <paul@...pouillou.net>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Peter Chen <Peter.Chen@....com>,
        Cristian Birsan <cristian.birsan@...rochip.com>,
        Felipe Balbi <balbi@...nel.org>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Ludovic Desroches <ludovic.desroches@...rochip.com>,
        Avi Fishman <avifishman70@...il.com>,
        Tomer Maimon <tmaimon77@...il.com>,
        Tali Perry <tali.perry1@...il.com>,
        Patrick Venture <venture@...gle.com>,
        Nancy Yuen <yuenn@...gle.com>,
        Benjamin Fair <benjaminfair@...gle.com>,
        Alan Stern <stern@...land.harvard.edu>,
        Tony Prisk <linux@...sktech.co.nz>, Bin Liu <b-liu@...com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, openbmc@...ts.ozlabs.org,
        Paul Cercueil <paul@...pouillou.net>
Subject: [PATCH 06/20] usb/chipidea: core: Use pm_ptr() macro

Use the newly introduced pm_ptr() macro, and mark the suspend/resume
functions __maybe_unused. These functions can then be moved outside the
CONFIG_PM_SUSPEND block, and the compiler can then process them and
detect build failures independently of the config. If unused, they will
simply be discarded by the compiler.

Signed-off-by: Paul Cercueil <paul@...pouillou.net>
---
 drivers/usb/chipidea/core.c | 26 +++++++++++---------------
 1 file changed, 11 insertions(+), 15 deletions(-)

diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
index aa40e510b806..af64ab98fb56 100644
--- a/drivers/usb/chipidea/core.c
+++ b/drivers/usb/chipidea/core.c
@@ -1231,9 +1231,8 @@ static int ci_hdrc_remove(struct platform_device *pdev)
 	return 0;
 }
 
-#ifdef CONFIG_PM
 /* Prepare wakeup by SRP before suspend */
-static void ci_otg_fsm_suspend_for_srp(struct ci_hdrc *ci)
+static void __maybe_unused ci_otg_fsm_suspend_for_srp(struct ci_hdrc *ci)
 {
 	if ((ci->fsm.otg->state == OTG_STATE_A_IDLE) &&
 				!hw_read_otgsc(ci, OTGSC_ID)) {
@@ -1245,7 +1244,7 @@ static void ci_otg_fsm_suspend_for_srp(struct ci_hdrc *ci)
 }
 
 /* Handle SRP when wakeup by data pulse */
-static void ci_otg_fsm_wakeup_by_srp(struct ci_hdrc *ci)
+static void __maybe_unused ci_otg_fsm_wakeup_by_srp(struct ci_hdrc *ci)
 {
 	if ((ci->fsm.otg->state == OTG_STATE_A_IDLE) &&
 		(ci->fsm.a_bus_drop == 1) && (ci->fsm.a_bus_req == 0)) {
@@ -1259,7 +1258,7 @@ static void ci_otg_fsm_wakeup_by_srp(struct ci_hdrc *ci)
 	}
 }
 
-static void ci_controller_suspend(struct ci_hdrc *ci)
+static void __maybe_unused ci_controller_suspend(struct ci_hdrc *ci)
 {
 	disable_irq(ci->irq);
 	ci_hdrc_enter_lpm(ci, true);
@@ -1277,7 +1276,7 @@ static void ci_controller_suspend(struct ci_hdrc *ci)
  * interrupt (wakeup int) only let the controller be out of
  * low power mode, but not handle any interrupts.
  */
-static void ci_extcon_wakeup_int(struct ci_hdrc *ci)
+static void __maybe_unused ci_extcon_wakeup_int(struct ci_hdrc *ci)
 {
 	struct ci_hdrc_cable *cable_id, *cable_vbus;
 	u32 otgsc = hw_read_otgsc(ci, ~0);
@@ -1294,7 +1293,7 @@ static void ci_extcon_wakeup_int(struct ci_hdrc *ci)
 		ci_irq(ci->irq, ci);
 }
 
-static int ci_controller_resume(struct device *dev)
+static int __maybe_unused ci_controller_resume(struct device *dev)
 {
 	struct ci_hdrc *ci = dev_get_drvdata(dev);
 	int ret;
@@ -1332,8 +1331,7 @@ static int ci_controller_resume(struct device *dev)
 	return 0;
 }
 
-#ifdef CONFIG_PM_SLEEP
-static int ci_suspend(struct device *dev)
+static int __maybe_unused ci_suspend(struct device *dev)
 {
 	struct ci_hdrc *ci = dev_get_drvdata(dev);
 
@@ -1366,7 +1364,7 @@ static int ci_suspend(struct device *dev)
 	return 0;
 }
 
-static int ci_resume(struct device *dev)
+static int __maybe_unused ci_resume(struct device *dev)
 {
 	struct ci_hdrc *ci = dev_get_drvdata(dev);
 	int ret;
@@ -1386,9 +1384,8 @@ static int ci_resume(struct device *dev)
 
 	return ret;
 }
-#endif /* CONFIG_PM_SLEEP */
 
-static int ci_runtime_suspend(struct device *dev)
+static int __maybe_unused ci_runtime_suspend(struct device *dev)
 {
 	struct ci_hdrc *ci = dev_get_drvdata(dev);
 
@@ -1408,13 +1405,12 @@ static int ci_runtime_suspend(struct device *dev)
 	return 0;
 }
 
-static int ci_runtime_resume(struct device *dev)
+static int __maybe_unused ci_runtime_resume(struct device *dev)
 {
 	return ci_controller_resume(dev);
 }
 
-#endif /* CONFIG_PM */
-static const struct dev_pm_ops ci_pm_ops = {
+static const struct dev_pm_ops __maybe_unused ci_pm_ops = {
 	SET_SYSTEM_SLEEP_PM_OPS(ci_suspend, ci_resume)
 	SET_RUNTIME_PM_OPS(ci_runtime_suspend, ci_runtime_resume, NULL)
 };
@@ -1424,7 +1420,7 @@ static struct platform_driver ci_hdrc_driver = {
 	.remove	= ci_hdrc_remove,
 	.driver	= {
 		.name	= "ci_hdrc",
-		.pm	= &ci_pm_ops,
+		.pm	= pm_ptr(&ci_pm_ops),
 		.dev_groups = ci_groups,
 	},
 };
-- 
2.28.0