linux-kernel - [PATCH 23/26] drm: vc4: Remove #ifdef guards for PM related functions

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Message-Id: <20221107175256.360839-13-paul@crapouillou.net>
Date:   Mon,  7 Nov 2022 17:52:53 +0000
From:   Paul Cercueil <paul@...pouillou.net>
To:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Paul Cercueil <paul@...pouillou.net>,
        Emma Anholt <emma@...olt.net>
Subject: [PATCH 23/26] drm: vc4: Remove #ifdef guards for PM related functions

Use the RUNTIME_PM_OPS() and pm_ptr() macros to handle the
.runtime_suspend/.runtime_resume callbacks.

These macros allow the suspend and resume functions to be automatically
dropped by the compiler when CONFIG_PM is disabled, without having
to use #ifdef guards.

This has the advantage of always compiling these functions in,
independently of any Kconfig option. Thanks to that, bugs and other
regressions are subsequently easier to catch.

Note that this driver should probably use the
DEFINE_RUNTIME_DEV_PM_OPS() macro instead, which will provide
.suspend/.resume callbacks, pointing to pm_runtime_force_suspend() and
pm_runtime_force_resume() respectively; unless those callbacks really
aren't needed.

Signed-off-by: Paul Cercueil <paul@...pouillou.net>
---
Cc: Emma Anholt <emma@...olt.net>
Cc: Maxime Ripard <mripard@...nel.org>
---
 drivers/gpu/drm/vc4/vc4_v3d.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/vc4/vc4_v3d.c b/drivers/gpu/drm/vc4/vc4_v3d.c
index 56abb0d6bc39..6000c7032b92 100644
--- a/drivers/gpu/drm/vc4/vc4_v3d.c
+++ b/drivers/gpu/drm/vc4/vc4_v3d.c
@@ -368,7 +368,6 @@ void vc4_v3d_bin_bo_put(struct vc4_dev *vc4)
 	mutex_unlock(&vc4->bin_bo_lock);
 }
 
-#ifdef CONFIG_PM
 static int vc4_v3d_runtime_suspend(struct device *dev)
 {
 	struct vc4_v3d *v3d = dev_get_drvdata(dev);
@@ -397,7 +396,6 @@ static int vc4_v3d_runtime_resume(struct device *dev)
 
 	return 0;
 }
-#endif
 
 int vc4_v3d_debugfs_init(struct drm_minor *minor)
 {
@@ -525,7 +523,7 @@ static void vc4_v3d_unbind(struct device *dev, struct device *master,
 }
 
 static const struct dev_pm_ops vc4_v3d_pm_ops = {
-	SET_RUNTIME_PM_OPS(vc4_v3d_runtime_suspend, vc4_v3d_runtime_resume, NULL)
+	RUNTIME_PM_OPS(vc4_v3d_runtime_suspend, vc4_v3d_runtime_resume, NULL)
 };
 
 static const struct component_ops vc4_v3d_ops = {
@@ -557,6 +555,6 @@ struct platform_driver vc4_v3d_driver = {
 	.driver = {
 		.name = "vc4_v3d",
 		.of_match_table = vc4_v3d_dt_match,
-		.pm = &vc4_v3d_pm_ops,
+		.pm = pm_ptr(&vc4_v3d_pm_ops),
 	},
 };
-- 
2.35.1