linux-kernel - [PATCH v2] drm/arm/malidp: Ensure that the crtcs are shutdown before removing any encoder/connector

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Message-Id: <1523633388-15112-1-git-send-email-ayan.halder@arm.com>
Date:   Fri, 13 Apr 2018 16:29:48 +0100
From:   Ayan Kumar Halder <ayan.halder@....com>
To:     ayan.halder@....com, liviu.dudau@....com, brian.starkey@....com,
        alexandru-cosmin.gheorghe@....com, malidp@...s.arm.com,
        airlied@...ux.ie, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Cc:     nd@....com
Subject: [PATCH v2] drm/arm/malidp: Ensure that the crtcs are shutdown before removing any encoder/connector

One needs to ensure that the crtcs are shutdown so that the
drm_crtc_state->connector_mask reflects that no connectors
are currently active. Further, it reduces the reference
count for each connector. This ensures that the connectors
and encoders can be cleanly removed either when _unbind
is called for the corresponding drivers or by
drm_mode_config_cleanup().

Signed-off-by: Ayan Kumar Halder <ayan.halder@....com>
---

Changes in v2:
 - Reset the connectors' mask and the reference counts in drm_device
before unbinding any of its components (ie connectors and 
encoders).

---
 drivers/gpu/drm/arm/malidp_drv.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/arm/malidp_drv.c b/drivers/gpu/drm/arm/malidp_drv.c
index 8d20faa..0a788d7 100644
--- a/drivers/gpu/drm/arm/malidp_drv.c
+++ b/drivers/gpu/drm/arm/malidp_drv.c
@@ -278,7 +278,6 @@ static int malidp_init(struct drm_device *drm)
 
 static void malidp_fini(struct drm_device *drm)
 {
-	drm_atomic_helper_shutdown(drm);
 	drm_mode_config_cleanup(drm);
 }
 
@@ -646,6 +645,7 @@ static int malidp_bind(struct device *dev)
 	malidp_de_irq_fini(drm);
 	drm->irq_enabled = false;
 irq_init_fail:
+	drm_atomic_helper_shutdown(drm);
 	component_unbind_all(dev, drm);
 bind_fail:
 	of_node_put(malidp->crtc.port);
@@ -681,6 +681,7 @@ static void malidp_unbind(struct device *dev)
 	malidp_se_irq_fini(drm);
 	malidp_de_irq_fini(drm);
 	drm->irq_enabled = false;
+	drm_atomic_helper_shutdown(drm);
 	component_unbind_all(dev, drm);
 	of_node_put(malidp->crtc.port);
 	malidp->crtc.port = NULL;
-- 
2.7.4