disp: msm: fix driver unload issues in gki config

Resolves segmentation fault during driver unload in GKI
configuration, caused by repeated debugfs destroy calls.
Also removes redundant unload calls.

Change-Id: I20a8efc1916b9a60766f9c7714a4b458aa518566
Signed-off-by: Orion Brody <obrody@codeaurora.org>

msm/msm_drv.c

@@ -397,13 +397,9 @@ static int msm_drm_uninit(struct device *dev)
 	struct msm_vm_client_entry *client_entry, *tmp;
 	int i;
 
-	/* We must cancel and cleanup any pending vblank enable/disable
-	 * work before drm_irq_uninstall() to avoid work re-enabling an
-	 * irq after uninstall has disabled it.
-	 */
-
 	flush_workqueue(priv->wq);
-	destroy_workqueue(priv->wq);
+	pm_runtime_get_sync(dev);
+
 	/* clean up display commit/event worker threads */
 	for (i = 0; i < priv->num_crtcs; i++) {
 		if (priv->disp_thread[i].thread) {
@@ -420,7 +416,11 @@ static int msm_drm_uninit(struct device *dev)
 	}
 
 	drm_kms_helper_poll_fini(ddev);
+	if (kms && kms->funcs)
+		kms->funcs->debugfs_destroy(kms);
 
+	sde_dbg_destroy();
+	debugfs_remove_recursive(priv->debug_root);
 	drm_mode_config_cleanup(ddev);
 
 	if (priv->registered) {
@@ -433,11 +433,7 @@ static int msm_drm_uninit(struct device *dev)
 		msm_fbdev_free(ddev);
 #endif
 	drm_atomic_helper_shutdown(ddev);
-	drm_mode_config_cleanup(ddev);
-
-	pm_runtime_get_sync(dev);
 	drm_irq_uninstall(ddev);
-	pm_runtime_put_sync(dev);
 
 	if (kms && kms->funcs)
 		kms->funcs->destroy(kms);
@@ -450,9 +446,7 @@ static int msm_drm_uninit(struct device *dev)
 	}
 
 	component_unbind_all(dev, ddev);
-
+	pm_runtime_put_sync(dev);
-	sde_dbg_destroy();
-	debugfs_remove_recursive(priv->debug_root);
 
 	sde_power_resource_deinit(pdev, &priv->phandle);
 
@@ -470,6 +464,7 @@ static int msm_drm_uninit(struct device *dev)
 	msm_mdss_destroy(ddev);
 
 	ddev->dev_private = NULL;
+	destroy_workqueue(priv->wq);
 	kfree(priv);
 
 	drm_dev_put(ddev);
@@ -2090,8 +2085,6 @@ static int msm_pdev_remove(struct platform_device *pdev)
 	component_master_del(&pdev->dev, &msm_drm_ops);
 	of_platform_depopulate(&pdev->dev);
 
-	msm_drm_unbind(&pdev->dev);
-	component_master_del(&pdev->dev, &msm_drm_ops);
 	return 0;
 }
 

msm/msm_kms.h

@@ -116,6 +116,8 @@ struct msm_kms_funcs {
 	/* debugfs: */
 	int (*debugfs_init)(struct msm_kms *kms, struct drm_minor *minor);
 #endif
+	/* destroys debugfs */
+	void (*debugfs_destroy)(struct msm_kms *kms);
 	/* handle continuous splash  */
 	int (*cont_splash_config)(struct msm_kms *kms);
 	/* check for continuous splash status */

msm/sde/sde_encoder.c

@@ -546,6 +546,7 @@ void sde_encoder_destroy(struct drm_encoder *drm_enc)
 {
 	struct sde_encoder_virt *sde_enc = NULL;
 	int i = 0;
+	unsigned int num_encs;
 
 	if (!drm_enc) {
 		SDE_ERROR("invalid encoder\n");
@@ -554,21 +555,29 @@ void sde_encoder_destroy(struct drm_encoder *drm_enc)
 
 	sde_enc = to_sde_encoder_virt(drm_enc);
 	SDE_DEBUG_ENC(sde_enc, "\n");
+	num_encs = sde_enc->num_phys_encs;
 
 	mutex_lock(&sde_enc->enc_lock);
 	sde_rsc_client_destroy(sde_enc->rsc_client);
 
-	for (i = 0; i < sde_enc->num_phys_encs; i++) {
+	for (i = 0; i < num_encs; i++) {
 		struct sde_encoder_phys *phys;
 
 		phys = sde_enc->phys_vid_encs[i];
 		if (phys && phys->ops.destroy) {
 			phys->ops.destroy(phys);
 			--sde_enc->num_phys_encs;
-			sde_enc->phys_encs[i] = NULL;
+			sde_enc->phys_vid_encs[i] = NULL;
 		}
 
 		phys = sde_enc->phys_cmd_encs[i];
+		if (phys && phys->ops.destroy) {
+			phys->ops.destroy(phys);
+			--sde_enc->num_phys_encs;
+			sde_enc->phys_cmd_encs[i] = NULL;
+		}
+
+		phys = sde_enc->phys_encs[i];
 		if (phys && phys->ops.destroy) {
 			phys->ops.destroy(phys);
 			--sde_enc->num_phys_encs;

msm/sde/sde_kms.c

@@ -161,8 +161,10 @@ static int _sde_debugfs_init(struct sde_kms *sde_kms)
 	return 0;
 }
 
-static void _sde_debugfs_destroy(struct sde_kms *sde_kms)
+static void sde_kms_debugfs_destroy(struct msm_kms *kms)
 {
+	struct sde_kms *sde_kms = to_sde_kms(kms);
+
 	/* don't need to NULL check debugfs_root */
 	if (sde_kms) {
 		sde_debugfs_vbif_destroy(sde_kms);
@@ -189,7 +191,7 @@ static int _sde_debugfs_init(struct sde_kms *sde_kms)
 	return 0;
 }
 
-static void _sde_debugfs_destroy(struct sde_kms *sde_kms)
+static void sde_kms_debugfs_destroy(struct msm_kms *kms)
 {
 }
 
@@ -1806,10 +1808,6 @@ static void _sde_kms_hw_destroy(struct sde_kms *sde_kms,
 
 	_sde_kms_unmap_all_splash_regions(sde_kms);
 
-	/* safe to call these more than once during shutdown */
-	_sde_debugfs_destroy(sde_kms);
-	_sde_kms_mmu_destroy(sde_kms);
-
 	if (sde_kms->catalog) {
 		for (i = 0; i < sde_kms->catalog->vbif_count; i++) {
 			u32 vbif_idx = sde_kms->catalog->vbif[i].id;
@@ -1848,6 +1846,7 @@ static void _sde_kms_hw_destroy(struct sde_kms *sde_kms,
 	sde_kms->mmio = NULL;
 
 	sde_reg_dma_deinit();
+	_sde_kms_mmu_destroy(sde_kms);
 }
 
 int sde_kms_mmu_detach(struct sde_kms *sde_kms, bool secure_only)
@@ -2936,6 +2935,7 @@ static const struct msm_kms_funcs kms_funcs = {
 	.pm_suspend      = sde_kms_pm_suspend,
 	.pm_resume       = sde_kms_pm_resume,
 	.destroy         = sde_kms_destroy,
+	.debugfs_destroy = sde_kms_debugfs_destroy,
 	.cont_splash_config = sde_kms_cont_splash_config,
 	.register_events = _sde_kms_register_events,
 	.get_address_space = _sde_kms_get_address_space,