linux-kernel - [PATCH v1 1/2] drm/msm: enable msm irq after all initializations are done successfully at msm_drm

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Date:   Fri, 3 Jun 2022 14:28:35 -0700
From:   Kuogee Hsieh <quic_khsieh@...cinc.com>
To:     <dri-devel@...ts.freedesktop.org>, <robdclark@...il.com>,
        <sean@...rly.run>, <swboyd@...omium.org>, <dianders@...omium.org>,
        <vkoul@...nel.org>, <daniel@...ll.ch>, <airlied@...ux.ie>,
        <agross@...nel.org>, <dmitry.baryshkov@...aro.org>,
        <bjorn.andersson@...aro.org>
CC:     Kuogee Hsieh <quic_khsieh@...cinc.com>,
        <quic_abhinavk@...cinc.com>, <quic_aravindh@...cinc.com>,
        <quic_sbillaka@...cinc.com>, <freedreno@...ts.freedesktop.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v1 1/2] drm/msm: enable msm irq after all initializations are done successfully at msm_drm_init()

At msm initialize phase, msm_drm_init() is called to initialize modules
sequentially. It will call msm_drm_uninit() to clean up initialized phase
if any module initialization return failed. This patch move msm_irq_install()
to the last step of msm_drm_init() after all modules are initialized successfully
so that no msm_irq_unistall() required at msm_drm_uninit() if any module
initialization failed happen at msm_drm_init().

Signed-off-by: Kuogee Hsieh <quic_khsieh@...cinc.com>
---
 drivers/gpu/drm/msm/msm_drv.c | 29 ++++++-----------------------
 1 file changed, 6 insertions(+), 23 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index 6665c5a..ab42e9a 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -132,15 +132,6 @@ static int msm_irq_install(struct drm_device *dev, unsigned int irq)
 	return 0;
 }
 
-static void msm_irq_uninstall(struct drm_device *dev)
-{
-	struct msm_drm_private *priv = dev->dev_private;
-	struct msm_kms *kms = priv->kms;
-
-	kms->funcs->irq_uninstall(kms);
-	free_irq(kms->irq, dev);
-}
-
 struct msm_vblank_work {
 	struct work_struct work;
 	int crtc_id;
@@ -232,10 +223,6 @@ static int msm_drm_uninit(struct device *dev)
 
 	drm_mode_config_cleanup(ddev);
 
-	pm_runtime_get_sync(dev);
-	msm_irq_uninstall(ddev);
-	pm_runtime_put_sync(dev);
-
 	if (kms && kms->funcs)
 		kms->funcs->destroy(kms);
 
@@ -437,16 +424,6 @@ static int msm_drm_init(struct device *dev, const struct drm_driver *drv)
 		goto err_msm_uninit;
 	}
 
-	if (kms) {
-		pm_runtime_get_sync(dev);
-		ret = msm_irq_install(ddev, kms->irq);
-		pm_runtime_put_sync(dev);
-		if (ret < 0) {
-			DRM_DEV_ERROR(dev, "failed to install IRQ handler\n");
-			goto err_msm_uninit;
-		}
-	}
-
 	ret = drm_dev_register(ddev, 0);
 	if (ret)
 		goto err_msm_uninit;
@@ -467,6 +444,12 @@ static int msm_drm_init(struct device *dev, const struct drm_driver *drv)
 	if (ret)
 		goto err_msm_uninit;
 
+	if (kms) {
+		pm_runtime_get_sync(dev);
+		msm_irq_install(ddev, kms->irq);
+		pm_runtime_put_sync(dev);
+	}
+
 	drm_kms_helper_poll_init(ddev);
 
 	return 0;
-- 
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