drm/imx/dcss: have all init functions use devres

dcss currently allocates and ioremaps quite a few resources in its probe
function's call graph. Devres now provides convenient functions which
perform the same task but do the cleanup automatically.

Port all memory allocations and ioremap() calls to the devres
counterparts.
Signed-off-by: Philipp Stanner <pstanner@redhat.com>
Reviewed-by: Laurentiu Palcu <laurentiu.palcu@oss.nxp.com>
Signed-off-by: Laurentiu Palcu <laurentiu.palcu@oss.nxp.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240124111904.18261-4-pstanner@redhat.com

drivers/gpu/drm/imx/dcss/dcss-blkctl.c

@@ -42,14 +42,13 @@ int dcss_blkctl_init(struct dcss_dev *dcss, unsigned long blkctl_base)
 {
 	struct dcss_blkctl *blkctl;
 
-	blkctl = kzalloc(sizeof(*blkctl), GFP_KERNEL);
+	blkctl = devm_kzalloc(dcss->dev, sizeof(*blkctl), GFP_KERNEL);
 	if (!blkctl)
 		return -ENOMEM;
 
-	blkctl->base_reg = ioremap(blkctl_base, SZ_4K);
+	blkctl->base_reg = devm_ioremap(dcss->dev, blkctl_base, SZ_4K);
 	if (!blkctl->base_reg) {
 		dev_err(dcss->dev, "unable to remap BLK CTRL base\n");
-		kfree(blkctl);
 		return -ENOMEM;
 	}
 
@@ -60,11 +59,3 @@ int dcss_blkctl_init(struct dcss_dev *dcss, unsigned long blkctl_base)
 
 	return 0;
 }
-
-void dcss_blkctl_exit(struct dcss_blkctl *blkctl)
-{
-	if (blkctl->base_reg)
-		iounmap(blkctl->base_reg);
-
-	kfree(blkctl);
-}

drivers/gpu/drm/imx/dcss/dcss-ctxld.c

@@ -202,7 +202,7 @@ int dcss_ctxld_init(struct dcss_dev *dcss, unsigned long ctxld_base)
 	struct dcss_ctxld *ctxld;
 	int ret;
 
-	ctxld = kzalloc(sizeof(*ctxld), GFP_KERNEL);
+	ctxld = devm_kzalloc(dcss->dev, sizeof(*ctxld), GFP_KERNEL);
 	if (!ctxld)
 		return -ENOMEM;
 
@@ -217,7 +217,7 @@ int dcss_ctxld_init(struct dcss_dev *dcss, unsigned long ctxld_base)
 		goto err;
 	}
 
-	ctxld->ctxld_reg = ioremap(ctxld_base, SZ_4K);
+	ctxld->ctxld_reg = devm_ioremap(dcss->dev, ctxld_base, SZ_4K);
 	if (!ctxld->ctxld_reg) {
 		dev_err(dcss->dev, "ctxld: unable to remap ctxld base\n");
 		ret = -ENOMEM;
@@ -226,18 +226,14 @@ int dcss_ctxld_init(struct dcss_dev *dcss, unsigned long ctxld_base)
 
 	ret = dcss_ctxld_irq_config(ctxld, to_platform_device(dcss->dev));
 	if (ret)
-		goto err_irq;
+		goto err;
 
 	dcss_ctxld_hw_cfg(ctxld);
 
 	return 0;
 
-err_irq:
-	iounmap(ctxld->ctxld_reg);
-
 err:
 	dcss_ctxld_free_ctx(ctxld);
-	kfree(ctxld);
 
 	return ret;
 }
@@ -246,11 +242,7 @@ void dcss_ctxld_exit(struct dcss_ctxld *ctxld)
 {
 	free_irq(ctxld->irq, ctxld);
 
-	if (ctxld->ctxld_reg)
-		iounmap(ctxld->ctxld_reg);
-
 	dcss_ctxld_free_ctx(ctxld);
-	kfree(ctxld);
 }
 
 static int dcss_ctxld_enable_locked(struct dcss_ctxld *ctxld)

drivers/gpu/drm/imx/dcss/dcss-dev.c

@@ -109,8 +109,6 @@ static int dcss_submodules_init(struct dcss_dev *dcss)
 	dcss_ctxld_exit(dcss->ctxld);
 
 ctxld_err:
-	dcss_blkctl_exit(dcss->blkctl);
-
 	dcss_clocks_disable(dcss);
 
 	return ret;
@@ -124,7 +122,6 @@ static void dcss_submodules_stop(struct dcss_dev *dcss)
 	dcss_ss_exit(dcss->ss);
 	dcss_dtg_exit(dcss->dtg);
 	dcss_ctxld_exit(dcss->ctxld);
-	dcss_blkctl_exit(dcss->blkctl);
 	dcss_clocks_disable(dcss);
 }
 
@@ -190,7 +187,7 @@ struct dcss_dev *dcss_dev_create(struct device *dev, bool hdmi_output)
 		return ERR_PTR(-EBUSY);
 	}
 
-	dcss = kzalloc(sizeof(*dcss), GFP_KERNEL);
+	dcss = devm_kzalloc(dev, sizeof(*dcss), GFP_KERNEL);
 	if (!dcss)
 		return ERR_PTR(-ENOMEM);
 
@@ -201,7 +198,7 @@ struct dcss_dev *dcss_dev_create(struct device *dev, bool hdmi_output)
 	ret = dcss_clks_init(dcss);
 	if (ret) {
 		dev_err(dev, "clocks initialization failed\n");
-		goto err;
+		return ERR_PTR(ret);
 	}
 
 	dcss->of_port = of_graph_get_port_by_id(dev->of_node, 0);
@@ -233,9 +230,6 @@ struct dcss_dev *dcss_dev_create(struct device *dev, bool hdmi_output)
 clks_err:
 	dcss_clks_release(dcss);
 
-err:
-	kfree(dcss);
-
 	return ERR_PTR(ret);
 }
 
@@ -253,8 +247,6 @@ void dcss_dev_destroy(struct dcss_dev *dcss)
 	dcss_submodules_stop(dcss);
 
 	dcss_clks_release(dcss);
-
-	kfree(dcss);
 }
 
 static int dcss_dev_suspend(struct device *dev)

drivers/gpu/drm/imx/dcss/dcss-dev.h

@@ -104,7 +104,6 @@ extern const struct dev_pm_ops dcss_dev_pm_ops;
 /* BLKCTL */
 int dcss_blkctl_init(struct dcss_dev *dcss, unsigned long blkctl_base);
 void dcss_blkctl_cfg(struct dcss_blkctl *blkctl);
-void dcss_blkctl_exit(struct dcss_blkctl *blkctl);
 
 /* CTXLD */
 int dcss_ctxld_init(struct dcss_dev *dcss, unsigned long ctxld_base);

drivers/gpu/drm/imx/dcss/dcss-dpr.c

@@ -135,7 +135,7 @@ static int dcss_dpr_ch_init_all(struct dcss_dpr *dpr, unsigned long dpr_base)
 
 		ch->base_ofs = dpr_base + i * 0x1000;
 
-		ch->base_reg = ioremap(ch->base_ofs, SZ_4K);
+		ch->base_reg = devm_ioremap(dpr->dev, ch->base_ofs, SZ_4K);
 		if (!ch->base_reg) {
 			dev_err(dpr->dev, "dpr: unable to remap ch %d base\n",
 				i);
@@ -155,7 +155,7 @@ int dcss_dpr_init(struct dcss_dev *dcss, unsigned long dpr_base)
 {
 	struct dcss_dpr *dpr;
 
-	dpr = kzalloc(sizeof(*dpr), GFP_KERNEL);
+	dpr = devm_kzalloc(dcss->dev, sizeof(*dpr), GFP_KERNEL);
 	if (!dpr)
 		return -ENOMEM;
 
@@ -164,18 +164,8 @@ int dcss_dpr_init(struct dcss_dev *dcss, unsigned long dpr_base)
 	dpr->ctxld = dcss->ctxld;
 	dpr->ctx_id = CTX_SB_HP;
 
-	if (dcss_dpr_ch_init_all(dpr, dpr_base)) {
-		int i;
-
-		for (i = 0; i < 3; i++) {
-			if (dpr->ch[i].base_reg)
-				iounmap(dpr->ch[i].base_reg);
-		}
-
-		kfree(dpr);
-
+	if (dcss_dpr_ch_init_all(dpr, dpr_base))
 		return -ENOMEM;
-	}
 
 	return 0;
 }
@@ -189,12 +179,7 @@ void dcss_dpr_exit(struct dcss_dpr *dpr)
 		struct dcss_dpr_ch *ch = &dpr->ch[ch_no];
 
 		dcss_writel(0, ch->base_reg + DCSS_DPR_SYSTEM_CTRL0);
-
-		if (ch->base_reg)
-			iounmap(ch->base_reg);
 	}
-
-	kfree(dpr);
 }
 
 static u32 dcss_dpr_x_pix_wide_adjust(struct dcss_dpr_ch *ch, u32 pix_wide,

drivers/gpu/drm/imx/dcss/dcss-drv.c

@@ -51,15 +51,13 @@ static int dcss_drv_platform_probe(struct platform_device *pdev)
 
 	of_node_put(remote);
 
-	mdrv = kzalloc(sizeof(*mdrv), GFP_KERNEL);
+	mdrv = devm_kzalloc(dev, sizeof(*mdrv), GFP_KERNEL);
 	if (!mdrv)
 		return -ENOMEM;
 
 	mdrv->dcss = dcss_dev_create(dev, hdmi_output);
-	if (IS_ERR(mdrv->dcss)) {
-		err = PTR_ERR(mdrv->dcss);
-		goto err;
-	}
+	if (IS_ERR(mdrv->dcss))
+		return PTR_ERR(mdrv->dcss);
 
 	dev_set_drvdata(dev, mdrv);
 
@@ -75,8 +73,6 @@ static int dcss_drv_platform_probe(struct platform_device *pdev)
 dcss_shutoff:
 	dcss_dev_destroy(mdrv->dcss);
 
-err:
-	kfree(mdrv);
 	return err;
 }
 
@@ -86,8 +82,6 @@ static void dcss_drv_platform_remove(struct platform_device *pdev)
 
 	dcss_kms_detach(mdrv->kms);
 	dcss_dev_destroy(mdrv->dcss);
-
-	kfree(mdrv);
 }
 
 static void dcss_drv_platform_shutdown(struct platform_device *pdev)

drivers/gpu/drm/imx/dcss/dcss-dtg.c

@@ -152,7 +152,7 @@ int dcss_dtg_init(struct dcss_dev *dcss, unsigned long dtg_base)
 	int ret = 0;
 	struct dcss_dtg *dtg;
 
-	dtg = kzalloc(sizeof(*dtg), GFP_KERNEL);
+	dtg = devm_kzalloc(dcss->dev, sizeof(*dtg), GFP_KERNEL);
 	if (!dtg)
 		return -ENOMEM;
 
@@ -160,11 +160,10 @@ int dcss_dtg_init(struct dcss_dev *dcss, unsigned long dtg_base)
 	dtg->dev = dcss->dev;
 	dtg->ctxld = dcss->ctxld;
 
-	dtg->base_reg = ioremap(dtg_base, SZ_4K);
+	dtg->base_reg = devm_ioremap(dtg->dev, dtg_base, SZ_4K);
 	if (!dtg->base_reg) {
-		dev_err(dcss->dev, "dtg: unable to remap dtg base\n");
-		ret = -ENOMEM;
-		goto err_ioremap;
+		dev_err(dtg->dev, "dtg: unable to remap dtg base\n");
+		return -ENOMEM;
 	}
 
 	dtg->base_ofs = dtg_base;
@@ -175,17 +174,7 @@ int dcss_dtg_init(struct dcss_dev *dcss, unsigned long dtg_base)
 	dtg->control_status |= OVL_DATA_MODE | BLENDER_VIDEO_ALPHA_SEL |
 		((dtg->alpha << DEFAULT_FG_ALPHA_POS) & DEFAULT_FG_ALPHA_MASK);
 
-	ret = dcss_dtg_irq_config(dtg, to_platform_device(dcss->dev));
-	if (ret)
-		goto err_irq;
-
-	return 0;
-
-err_irq:
-	iounmap(dtg->base_reg);
-
-err_ioremap:
-	kfree(dtg);
+	ret = dcss_dtg_irq_config(dtg, to_platform_device(dtg->dev));
 
 	return ret;
 }
@@ -193,11 +182,6 @@ int dcss_dtg_init(struct dcss_dev *dcss, unsigned long dtg_base)
 void dcss_dtg_exit(struct dcss_dtg *dtg)
 {
 	free_irq(dtg->ctxld_kick_irq, dtg);
-
-	if (dtg->base_reg)
-		iounmap(dtg->base_reg);
-
-	kfree(dtg);
 }
 
 void dcss_dtg_sync_set(struct dcss_dtg *dtg, struct videomode *vm)

drivers/gpu/drm/imx/dcss/dcss-scaler.c

@@ -302,7 +302,7 @@ static int dcss_scaler_ch_init_all(struct dcss_scaler *scl,
 
 		ch->base_ofs = scaler_base + i * 0x400;
 
-		ch->base_reg = ioremap(ch->base_ofs, SZ_4K);
+		ch->base_reg = devm_ioremap(scl->dev, ch->base_ofs, SZ_4K);
 		if (!ch->base_reg) {
 			dev_err(scl->dev, "scaler: unable to remap ch base\n");
 			return -ENOMEM;
@@ -318,7 +318,7 @@ int dcss_scaler_init(struct dcss_dev *dcss, unsigned long scaler_base)
 {
 	struct dcss_scaler *scaler;
 
-	scaler = kzalloc(sizeof(*scaler), GFP_KERNEL);
+	scaler = devm_kzalloc(dcss->dev, sizeof(*scaler), GFP_KERNEL);
 	if (!scaler)
 		return -ENOMEM;
 
@@ -327,18 +327,8 @@ int dcss_scaler_init(struct dcss_dev *dcss, unsigned long scaler_base)
 	scaler->ctxld = dcss->ctxld;
 	scaler->ctx_id = CTX_SB_HP;
 
-	if (dcss_scaler_ch_init_all(scaler, scaler_base)) {
-		int i;
-
-		for (i = 0; i < 3; i++) {
-			if (scaler->ch[i].base_reg)
-				iounmap(scaler->ch[i].base_reg);
-		}
-
-		kfree(scaler);
-
+	if (dcss_scaler_ch_init_all(scaler, scaler_base))
 		return -ENOMEM;
-	}
 
 	return 0;
 }
@@ -351,12 +341,7 @@ void dcss_scaler_exit(struct dcss_scaler *scl)
 		struct dcss_scaler_ch *ch = &scl->ch[ch_no];
 
 		dcss_writel(0, ch->base_reg + DCSS_SCALER_CTRL);
-
-		if (ch->base_reg)
-			iounmap(ch->base_reg);
 	}
-
-	kfree(scl);
 }
 
 void dcss_scaler_ch_enable(struct dcss_scaler *scl, int ch_num, bool en)

drivers/gpu/drm/imx/dcss/dcss-ss.c

@@ -83,7 +83,7 @@ int dcss_ss_init(struct dcss_dev *dcss, unsigned long ss_base)
 {
 	struct dcss_ss *ss;
 
-	ss = kzalloc(sizeof(*ss), GFP_KERNEL);
+	ss = devm_kzalloc(dcss->dev, sizeof(*ss), GFP_KERNEL);
 	if (!ss)
 		return -ENOMEM;
 
@@ -91,10 +91,9 @@ int dcss_ss_init(struct dcss_dev *dcss, unsigned long ss_base)
 	ss->dev = dcss->dev;
 	ss->ctxld = dcss->ctxld;
 
-	ss->base_reg = ioremap(ss_base, SZ_4K);
+	ss->base_reg = devm_ioremap(ss->dev, ss_base, SZ_4K);
 	if (!ss->base_reg) {
-		dev_err(dcss->dev, "ss: unable to remap ss base\n");
-		kfree(ss);
+		dev_err(ss->dev, "ss: unable to remap ss base\n");
 		return -ENOMEM;
 	}
 
@@ -108,11 +107,6 @@ void dcss_ss_exit(struct dcss_ss *ss)
 {
 	/* stop SS */
 	dcss_writel(0, ss->base_reg + DCSS_SS_SYS_CTRL);
-
-	if (ss->base_reg)
-		iounmap(ss->base_reg);
-
-	kfree(ss);
 }
 
 void dcss_ss_subsam_set(struct dcss_ss *ss)