Date: Wed, 24 Jan 2024 12:19:05 +0100
From: Philipp Stanner <pstanner@...hat.com>
To: Laurentiu Palcu <laurentiu.palcu@....nxp.com>,
	Lucas Stach <l.stach@...gutronix.de>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Daniel Vetter <daniel@...ll.ch>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>
Cc: NXP Linux Team <linux-imx@....com>,
	dri-devel@...ts.freedesktop.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Philipp Stanner <pstanner@...hat.com>
Subject: [PATCH v4 2/2] 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@...hat.com>
---
 drivers/gpu/drm/imx/dcss/dcss-blkctl.c | 13 ++-----------
 drivers/gpu/drm/imx/dcss/dcss-ctxld.c  | 14 +++-----------
 drivers/gpu/drm/imx/dcss/dcss-dev.c    | 12 ++----------
 drivers/gpu/drm/imx/dcss/dcss-dev.h    |  1 -
 drivers/gpu/drm/imx/dcss/dcss-dpr.c    | 21 +++------------------
 drivers/gpu/drm/imx/dcss/dcss-drv.c    | 12 +++---------
 drivers/gpu/drm/imx/dcss/dcss-dtg.c    | 26 +++++---------------------
 drivers/gpu/drm/imx/dcss/dcss-scaler.c | 21 +++------------------
 drivers/gpu/drm/imx/dcss/dcss-ss.c     | 12 +++---------
 9 files changed, 24 insertions(+), 108 deletions(-)

diff --git a/drivers/gpu/drm/imx/dcss/dcss-blkctl.c b/drivers/gpu/drm/imx/dcss/dcss-blkctl.c
index c9b54bb2692d..803e3fcdb50f 100644
--- a/drivers/gpu/drm/imx/dcss/dcss-blkctl.c
+++ b/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);
-}
diff --git a/drivers/gpu/drm/imx/dcss/dcss-ctxld.c b/drivers/gpu/drm/imx/dcss/dcss-ctxld.c
index 3a84cb3209c4..e41d5c2a3ea4 100644
--- a/drivers/gpu/drm/imx/dcss/dcss-ctxld.c
+++ b/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)
diff --git a/drivers/gpu/drm/imx/dcss/dcss-dev.c b/drivers/gpu/drm/imx/dcss/dcss-dev.c
index d448bf1c205e..597e9b7bd4bf 100644
--- a/drivers/gpu/drm/imx/dcss/dcss-dev.c
+++ b/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)
diff --git a/drivers/gpu/drm/imx/dcss/dcss-dev.h b/drivers/gpu/drm/imx/dcss/dcss-dev.h
index f27b87c09599..b032e873d227 100644
--- a/drivers/gpu/drm/imx/dcss/dcss-dev.h
+++ b/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);
diff --git a/drivers/gpu/drm/imx/dcss/dcss-dpr.c b/drivers/gpu/drm/imx/dcss/dcss-dpr.c
index df9dab949bf2..072eb209249f 100644
--- a/drivers/gpu/drm/imx/dcss/dcss-dpr.c
+++ b/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,
diff --git a/drivers/gpu/drm/imx/dcss/dcss-drv.c b/drivers/gpu/drm/imx/dcss/dcss-drv.c
index ad5f29ea8f6a..d881f5a34760 100644
--- a/drivers/gpu/drm/imx/dcss/dcss-drv.c
+++ b/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)
diff --git a/drivers/gpu/drm/imx/dcss/dcss-dtg.c b/drivers/gpu/drm/imx/dcss/dcss-dtg.c
index 30de00540f63..2968f5d5bd41 100644
--- a/drivers/gpu/drm/imx/dcss/dcss-dtg.c
+++ b/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)
diff --git a/drivers/gpu/drm/imx/dcss/dcss-scaler.c b/drivers/gpu/drm/imx/dcss/dcss-scaler.c
index 47852b9dd5ea..825728c356ff 100644
--- a/drivers/gpu/drm/imx/dcss/dcss-scaler.c
+++ b/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)
diff --git a/drivers/gpu/drm/imx/dcss/dcss-ss.c b/drivers/gpu/drm/imx/dcss/dcss-ss.c
index 8ddf08da911b..0df81866fb7b 100644
--- a/drivers/gpu/drm/imx/dcss/dcss-ss.c
+++ b/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)
-- 
2.43.0

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