[PATCH v3 10/14] drm/msm: tear down only a successfully initialised KMS

[Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>]

All the kms drivers now undo their own failures in kms_init() and have
folded their hardware setup into it.

Drop ->hw_init(), call ->destroy() only for a KMS which was initialised
successfully, and remove the flag which let the drivers opt in to that
one at a time, as well as the handling of a half torn down KMS in
msm_kms_destroy().

Assisted-by: LLM
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c  |  2 --
 drivers/gpu/drm/msm/disp/mdp4/mdp4_kms.c |  1 -
 drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c |  2 --
 drivers/gpu/drm/msm/msm_kms.c            | 16 ++--------------
 drivers/gpu/drm/msm/msm_kms.h            | 10 ++--------
 5 files changed, 4 insertions(+), 27 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
index 255beb83fc94..65ba8fa697e9 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
@@ -1290,8 +1290,6 @@ static int dpu_kms_init(struct drm_device *ddev)
 	int ret = 0;
 	unsigned long max_freq = ULONG_MAX;
 
-	dpu_kms->base.init_unwinds = true;
-
 	opp = dev_pm_opp_find_freq_floor(dev, &max_freq);
 	if (!IS_ERR(opp))
 		dev_pm_opp_put(opp);
diff --git a/drivers/gpu/drm/msm/disp/mdp4/mdp4_kms.c b/drivers/gpu/drm/msm/disp/mdp4/mdp4_kms.c
index c2172e5f9e85..c1f61ecf800f 100644
--- a/drivers/gpu/drm/msm/disp/mdp4/mdp4_kms.c
+++ b/drivers/gpu/drm/msm/disp/mdp4/mdp4_kms.c
@@ -409,7 +409,6 @@ static int mdp4_kms_init(struct drm_device *dev)
 	/* TODO: Chips that aren't apq8064 have a 200 Mhz max_clk */
 	max_clk = 266667000;
 
-	kms->init_unwinds = true;
 	mdp4_kms->dev = dev;
 
 	ret = mdp_kms_init(&mdp4_kms->base, &kms_funcs);
diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
index 30af8ef51e4c..c349eedd55a6 100644
--- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
+++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
@@ -505,8 +505,6 @@ static int mdp5_kms_init(struct drm_device *dev)
 	struct drm_gpuvm *vm;
 	int i, ret;
 
-	kms->init_unwinds = true;
-
 	ret = mdp5_init(to_platform_device(dev->dev), dev);
 	if (ret)
 		return ret;
diff --git a/drivers/gpu/drm/msm/msm_kms.c b/drivers/gpu/drm/msm/msm_kms.c
index e4d61935a6df..9a207c1e8583 100644
--- a/drivers/gpu/drm/msm/msm_kms.c
+++ b/drivers/gpu/drm/msm/msm_kms.c
@@ -293,17 +293,7 @@ int msm_drm_kms_init(struct device *dev, const struct drm_driver *drv)
 	ret = priv->kms_init(ddev);
 	if (ret) {
 		DRM_DEV_ERROR(dev, "failed to load kms\n");
-		if (kms->init_unwinds)
-			goto err_destroy_snapshot;
-		goto err_destroy_kms;
-	}
-
-	if (kms->funcs->hw_init) {
-		ret = kms->funcs->hw_init(kms);
-		if (ret) {
-			DRM_DEV_ERROR(dev, "kms hw init failed: %d\n", ret);
-			goto err_destroy_kms;
-		}
+		goto err_destroy_snapshot;
 	}
 
 	drm_helper_move_panel_connectors_to_head(ddev);
@@ -347,9 +337,7 @@ int msm_drm_kms_init(struct device *dev, const struct drm_driver *drv)
 
 err_destroy_event_threads:
 	msm_drm_kms_destroy_event_threads(kms);
-err_destroy_kms:
-	if (kms->funcs)
-		kms->funcs->destroy(kms);
+	kms->funcs->destroy(kms);
 err_destroy_snapshot:
 	msm_disp_snapshot_destroy(ddev);
 
diff --git a/drivers/gpu/drm/msm/msm_kms.h b/drivers/gpu/drm/msm/msm_kms.h
index 2f097e23e2e9..b5e1cd38cd8a 100644
--- a/drivers/gpu/drm/msm/msm_kms.h
+++ b/drivers/gpu/drm/msm/msm_kms.h
@@ -23,8 +23,6 @@
  * for constructing the appropriate planes/crtcs/encoders/connectors.
  */
 struct msm_kms_funcs {
-	/* hw initialization: */
-	int (*hw_init)(struct msm_kms *kms);
 	/* irq handling: */
 	void (*irq_preinstall)(struct msm_kms *kms);
 	int (*irq_postinstall)(struct msm_kms *kms);
@@ -149,9 +147,6 @@ struct msm_kms {
 	int irq;
 	bool irq_requested;
 
-	/* set by the kms drivers whose kms_init() undoes its own failures */
-	bool init_unwinds;
-
 	/* rate limit the snapshot capture to once per attach */
 	atomic_t fault_snapshot_capture;
 
@@ -214,9 +209,8 @@ static inline void msm_kms_destroy(struct msm_kms *kms)
 	for (i = 0; i < ARRAY_SIZE(kms->pending_timers); i++)
 		msm_atomic_destroy_pending_timer(&kms->pending_timers[i]);
 
-	/* the kms drivers' ->destroy() also runs after a failed init */
-	if (kms->wq)
-		destroy_workqueue(kms->wq);
+	destroy_workqueue(kms->wq);
+	kms->wq = NULL;
 }
 
 #define for_each_crtc_mask(dev, crtc, crtc_mask) \

-- 
2.47.3