linux-kernel - [PATCH v4] drm/v3d/v3d_drv: Fix PM disable depth imbalance

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Message-Id: <20220602024408.43070-1-linmq006@gmail.com>
Date:   Thu,  2 Jun 2022 06:44:07 +0400
From:   Miaoqian Lin <linmq006@...il.com>
To:     Emma Anholt <emma@...olt.net>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, Eric Anholt <eric@...olt.net>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc:     linmq006@...il.com
Subject: [PATCH v4] drm/v3d/v3d_drv: Fix PM disable depth imbalance

The pm_runtime_enable will increase power disable depth.
We need to call pm_runtime_disable() to balance it when needed
use devm_pm_runtime_enable() and handle it automatically/

Fixes: 57692c94dcbe ("drm/v3d: Introduce a new DRM driver for Broadcom V3D V3.x+")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
Changes in v4:
- use devm_pm_runtime_enable()

Changes in v3:
- call pm_runtime_disable() in v3d_platform_drm_remove
- update commit message

Changes in v2
- put pm_runtime_disable before dma_free_wc
- rename dma_free to pm_disable

v1: https://lore.kernel.org/r/20220105120442.14418-1-linmq006@gmail.com
v2: https://lore.kernel.org/r/20220106124657.32737-1-linmq006@gmail.com
v3: https://lore.kernel.org/all/20220601122050.1822-1-linmq006@gmail.com
---
 drivers/gpu/drm/v3d/v3d_drv.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/v3d/v3d_drv.c b/drivers/gpu/drm/v3d/v3d_drv.c
index 1afcd54fbbd5..563ad4b9c2e8 100644
--- a/drivers/gpu/drm/v3d/v3d_drv.c
+++ b/drivers/gpu/drm/v3d/v3d_drv.c
@@ -282,7 +282,9 @@ static int v3d_platform_drm_probe(struct platform_device *pdev)
 
 	pm_runtime_use_autosuspend(dev);
 	pm_runtime_set_autosuspend_delay(dev, 50);
-	pm_runtime_enable(dev);
+	ret = devm_pm_runtime_enable(dev);
+	if (ret)
+		goto dma_free;
 
 	ret = v3d_gem_init(drm);
 	if (ret)
-- 
2.25.1