[PATCH v3 0/2] drm/imx/dcss: implement region request and devres

[PATCH v3 0/2] drm/imx/dcss: implement region request and devres

[Philipp Stanner]

OK, I messed up the ARM64 build. That's what you get for living on x86
for years and decades. Mea culpa. Should work now.

--

Changes in v3:
- Fix build errors (missing variable, forgotten remove to call of deleted
  function)

Changes in v2:
- Add the region-request to this patch-series. That was previously a
  separate patch.

dcss currently does not request its memory resource. This series adds
that request with devres. As we're at it, it also ports all the ioremaps
and associated allocations to devres.

I can build this, but I don't have the hardware available to test it. So
you might want to have a closer look.

P.

Philipp Stanner (2):
  drm/imx/dcss: request memory region
  drm/imx/dcss: have all init functions use devres

 drivers/gpu/drm/imx/dcss/dcss-blkctl.c | 14 +++-----------
 drivers/gpu/drm/imx/dcss/dcss-ctxld.c  | 15 ++++-----------
 drivers/gpu/drm/imx/dcss/dcss-dev.c    | 19 +++++++++----------
 drivers/gpu/drm/imx/dcss/dcss-dev.h    |  1 -
 drivers/gpu/drm/imx/dcss/dcss-dpr.c    | 25 ++++++-------------------
 drivers/gpu/drm/imx/dcss/dcss-drv.c    | 12 +++---------
 drivers/gpu/drm/imx/dcss/dcss-dtg.c    | 23 ++++-------------------
 drivers/gpu/drm/imx/dcss/dcss-scaler.c | 24 +++++-------------------
 drivers/gpu/drm/imx/dcss/dcss-ss.c     | 11 +++--------
 9 files changed, 37 insertions(+), 107 deletions(-)

-- 
2.43.0


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[PATCH v3 1/2] drm/imx/dcss: request memory region

[Philipp Stanner]

The driver's memory regions are currently just ioremap()ed, but not
reserved through a request. That's not a bug, but having the request is
a little more robust.

Implement the region-request through the corresponding managed
devres-function.

Signed-off-by: Philipp Stanner <pstanner@redhat.com>
---
 drivers/gpu/drm/imx/dcss/dcss-dev.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/imx/dcss/dcss-dev.c b/drivers/gpu/drm/imx/dcss/dcss-dev.c
index 4f3af0dfb344..d448bf1c205e 100644
--- a/drivers/gpu/drm/imx/dcss/dcss-dev.c
+++ b/drivers/gpu/drm/imx/dcss/dcss-dev.c
@@ -170,6 +170,7 @@ struct dcss_dev *dcss_dev_create(struct device *dev, bool hdmi_output)
 	struct resource *res;
 	struct dcss_dev *dcss;
 	const struct dcss_type_data *devtype;
+	resource_size_t res_len;
 
 	devtype = of_device_get_match_data(dev);
 	if (!devtype) {
@@ -183,6 +184,12 @@ struct dcss_dev *dcss_dev_create(struct device *dev, bool hdmi_output)
 		return ERR_PTR(-EINVAL);
 	}
 
+	res_len = res->end - res->start;
+	if (!devm_request_mem_region(dev, res->start, res_len, "dcss")) {
+		dev_err(dev, "cannot request memory region\n");
+		return ERR_PTR(-EBUSY);
+	}
+
 	dcss = kzalloc(sizeof(*dcss), GFP_KERNEL);
 	if (!dcss)
 		return ERR_PTR(-ENOMEM);
-- 
2.43.0


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[PATCH v3 2/2] drm/imx/dcss: have all init functions use devres

[Philipp Stanner]

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>
---
 drivers/gpu/drm/imx/dcss/dcss-blkctl.c | 14 +++-----------
 drivers/gpu/drm/imx/dcss/dcss-ctxld.c  | 15 ++++-----------
 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    | 25 ++++++-------------------
 drivers/gpu/drm/imx/dcss/dcss-drv.c    | 12 +++---------
 drivers/gpu/drm/imx/dcss/dcss-dtg.c    | 23 ++++-------------------
 drivers/gpu/drm/imx/dcss/dcss-scaler.c | 24 +++++-------------------
 drivers/gpu/drm/imx/dcss/dcss-ss.c     | 11 +++--------
 9 files changed, 30 insertions(+), 107 deletions(-)

diff --git a/drivers/gpu/drm/imx/dcss/dcss-blkctl.c b/drivers/gpu/drm/imx/dcss/dcss-blkctl.c
index c9b54bb2692d..58e12ec65f80 100644
--- a/drivers/gpu/drm/imx/dcss/dcss-blkctl.c
+++ b/drivers/gpu/drm/imx/dcss/dcss-blkctl.c
@@ -41,15 +41,15 @@ void dcss_blkctl_cfg(struct dcss_blkctl *blkctl)
 int dcss_blkctl_init(struct dcss_dev *dcss, unsigned long blkctl_base)
 {
 	struct dcss_blkctl *blkctl;
+	struct device *dev = dcss->dev;
 
-	blkctl = kzalloc(sizeof(*blkctl), GFP_KERNEL);
+	blkctl = devm_kzalloc(dev, sizeof(*blkctl), GFP_KERNEL);
 	if (!blkctl)
 		return -ENOMEM;
 
-	blkctl->base_reg = ioremap(blkctl_base, SZ_4K);
+	blkctl->base_reg = devm_ioremap(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 +60,3 @@ 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..444511d0f382 100644
--- a/drivers/gpu/drm/imx/dcss/dcss-ctxld.c
+++ b/drivers/gpu/drm/imx/dcss/dcss-ctxld.c
@@ -199,10 +199,11 @@ static int dcss_ctxld_alloc_ctx(struct dcss_ctxld *ctxld)
 
 int dcss_ctxld_init(struct dcss_dev *dcss, unsigned long ctxld_base)
 {
+	struct device *dev = dcss->dev;
 	struct dcss_ctxld *ctxld;
 	int ret;
 
-	ctxld = kzalloc(sizeof(*ctxld), GFP_KERNEL);
+	ctxld = devm_kzalloc(dev, sizeof(*ctxld), GFP_KERNEL);
 	if (!ctxld)
 		return -ENOMEM;
 
@@ -217,7 +218,7 @@ 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(dev, ctxld_base, SZ_4K);
 	if (!ctxld->ctxld_reg) {
 		dev_err(dcss->dev, "ctxld: unable to remap ctxld base\n");
 		ret = -ENOMEM;
@@ -226,18 +227,14 @@ 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 +243,7 @@ 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..d6b2ad5e6977 100644
--- a/drivers/gpu/drm/imx/dcss/dcss-dpr.c
+++ b/drivers/gpu/drm/imx/dcss/dcss-dpr.c
@@ -125,7 +125,8 @@ static void dcss_dpr_write(struct dcss_dpr_ch *ch, u32 val, u32 ofs)
 	dcss_ctxld_write(dpr->ctxld, dpr->ctx_id, val, ch->base_ofs + ofs);
 }
 
-static int dcss_dpr_ch_init_all(struct dcss_dpr *dpr, unsigned long dpr_base)
+static int dcss_dpr_ch_init_all(struct device *dev, struct dcss_dpr *dpr,
+		unsigned long dpr_base)
 {
 	struct dcss_dpr_ch *ch;
 	int i;
@@ -135,7 +136,7 @@ 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(dev, ch->base_ofs, SZ_4K);
 		if (!ch->base_reg) {
 			dev_err(dpr->dev, "dpr: unable to remap ch %d base\n",
 				i);
@@ -154,8 +155,9 @@ static int dcss_dpr_ch_init_all(struct dcss_dpr *dpr, unsigned long dpr_base)
 int dcss_dpr_init(struct dcss_dev *dcss, unsigned long dpr_base)
 {
 	struct dcss_dpr *dpr;
+	struct device *dev = dcss->dev;
 
-	dpr = kzalloc(sizeof(*dpr), GFP_KERNEL);
+	dpr = devm_kzalloc(dev, sizeof(*dpr), GFP_KERNEL);
 	if (!dpr)
 		return -ENOMEM;
 
@@ -164,18 +166,8 @@ 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(dev, dpr, dpr_base))
 		return -ENOMEM;
-	}
 
 	return 0;
 }
@@ -189,12 +181,7 @@ 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 b61cec0cc79d..bd3f9d58042c 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;
 }
 
@@ -87,8 +83,6 @@ static int dcss_drv_platform_remove(struct platform_device *pdev)
 	dcss_kms_detach(mdrv->kms);
 	dcss_dev_destroy(mdrv->dcss);
 
-	kfree(mdrv);
-
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/imx/dcss/dcss-dtg.c b/drivers/gpu/drm/imx/dcss/dcss-dtg.c
index 30de00540f63..5c0f697587e6 100644
--- a/drivers/gpu/drm/imx/dcss/dcss-dtg.c
+++ b/drivers/gpu/drm/imx/dcss/dcss-dtg.c
@@ -151,8 +151,9 @@ int dcss_dtg_init(struct dcss_dev *dcss, unsigned long dtg_base)
 {
 	int ret = 0;
 	struct dcss_dtg *dtg;
+	struct device *dev = dcss->dev;
 
-	dtg = kzalloc(sizeof(*dtg), GFP_KERNEL);
+	dtg = devm_kzalloc(dev, sizeof(*dtg), GFP_KERNEL);
 	if (!dtg)
 		return -ENOMEM;
 
@@ -160,11 +161,10 @@ 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(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;
+		return -ENOMEM;
 	}
 
 	dtg->base_ofs = dtg_base;
@@ -176,16 +176,6 @@ int dcss_dtg_init(struct dcss_dev *dcss, unsigned long dtg_base)
 		((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);
 
 	return ret;
 }
@@ -193,11 +183,6 @@ 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..ed4d1eb9442e 100644
--- a/drivers/gpu/drm/imx/dcss/dcss-scaler.c
+++ b/drivers/gpu/drm/imx/dcss/dcss-scaler.c
@@ -291,7 +291,7 @@ static void dcss_scaler_write(struct dcss_scaler_ch *ch, u32 val, u32 ofs)
 	dcss_ctxld_write(scl->ctxld, scl->ctx_id, val, ch->base_ofs + ofs);
 }
 
-static int dcss_scaler_ch_init_all(struct dcss_scaler *scl,
+static int dcss_scaler_ch_init_all(struct device *dev, struct dcss_scaler *scl,
 				   unsigned long scaler_base)
 {
 	struct dcss_scaler_ch *ch;
@@ -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(dev, ch->base_ofs, SZ_4K);
 		if (!ch->base_reg) {
 			dev_err(scl->dev, "scaler: unable to remap ch base\n");
 			return -ENOMEM;
@@ -317,8 +317,9 @@ static int dcss_scaler_ch_init_all(struct dcss_scaler *scl,
 int dcss_scaler_init(struct dcss_dev *dcss, unsigned long scaler_base)
 {
 	struct dcss_scaler *scaler;
+	struct device *dev = dcss->dev;
 
-	scaler = kzalloc(sizeof(*scaler), GFP_KERNEL);
+	scaler = devm_kzalloc(dev, sizeof(*scaler), GFP_KERNEL);
 	if (!scaler)
 		return -ENOMEM;
 
@@ -327,18 +328,8 @@ 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(dev, scaler, scaler_base))
 		return -ENOMEM;
-	}
 
 	return 0;
 }
@@ -351,12 +342,7 @@ 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..0a8320adc302 100644
--- a/drivers/gpu/drm/imx/dcss/dcss-ss.c
+++ b/drivers/gpu/drm/imx/dcss/dcss-ss.c
@@ -82,8 +82,9 @@ static void dcss_ss_write(struct dcss_ss *ss, u32 val, u32 ofs)
 int dcss_ss_init(struct dcss_dev *dcss, unsigned long ss_base)
 {
 	struct dcss_ss *ss;
+	struct device *dev = dcss->dev;
 
-	ss = kzalloc(sizeof(*ss), GFP_KERNEL);
+	ss = devm_kzalloc(dev, sizeof(*ss), GFP_KERNEL);
 	if (!ss)
 		return -ENOMEM;
 
@@ -91,10 +92,9 @@ 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(dev, ss_base, SZ_4K);
 	if (!ss->base_reg) {
 		dev_err(dcss->dev, "ss: unable to remap ss base\n");
-		kfree(ss);
 		return -ENOMEM;
 	}
 
@@ -108,11 +108,6 @@ 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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Re: [PATCH v3 1/2] drm/imx/dcss: request memory region

[Laurentiu Palcu]

Hi Philipp,

On Thu, Jan 11, 2024 at 11:13:46AM +0100, Philipp Stanner wrote:
> The driver's memory regions are currently just ioremap()ed, but not
> reserved through a request. That's not a bug, but having the request is
> a little more robust.
> 
> Implement the region-request through the corresponding managed
> devres-function.
> 
> Signed-off-by: Philipp Stanner <pstanner@redhat.com>

Reviewed-by: Laurentiu Palcu <laurentiu.palcu@oss.nxp.com>

Thanks,
Laurentiu

> ---
>  drivers/gpu/drm/imx/dcss/dcss-dev.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/gpu/drm/imx/dcss/dcss-dev.c b/drivers/gpu/drm/imx/dcss/dcss-dev.c
> index 4f3af0dfb344..d448bf1c205e 100644
> --- a/drivers/gpu/drm/imx/dcss/dcss-dev.c
> +++ b/drivers/gpu/drm/imx/dcss/dcss-dev.c
> @@ -170,6 +170,7 @@ struct dcss_dev *dcss_dev_create(struct device *dev, bool hdmi_output)
>  	struct resource *res;
>  	struct dcss_dev *dcss;
>  	const struct dcss_type_data *devtype;
> +	resource_size_t res_len;
>  
>  	devtype = of_device_get_match_data(dev);
>  	if (!devtype) {
> @@ -183,6 +184,12 @@ struct dcss_dev *dcss_dev_create(struct device *dev, bool hdmi_output)
>  		return ERR_PTR(-EINVAL);
>  	}
>  
> +	res_len = res->end - res->start;
> +	if (!devm_request_mem_region(dev, res->start, res_len, "dcss")) {
> +		dev_err(dev, "cannot request memory region\n");
> +		return ERR_PTR(-EBUSY);
> +	}
> +
>  	dcss = kzalloc(sizeof(*dcss), GFP_KERNEL);
>  	if (!dcss)
>  		return ERR_PTR(-ENOMEM);
> -- 
> 2.43.0
> 

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Re: [PATCH v3 2/2] drm/imx/dcss: have all init functions use devres

[Laurentiu Palcu]

Hi Philipp,

Several minor comments below.

On Thu, Jan 11, 2024 at 11:13:47AM +0100, Philipp Stanner wrote:
> 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>
> ---
>  drivers/gpu/drm/imx/dcss/dcss-blkctl.c | 14 +++-----------
>  drivers/gpu/drm/imx/dcss/dcss-ctxld.c  | 15 ++++-----------
>  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    | 25 ++++++-------------------
>  drivers/gpu/drm/imx/dcss/dcss-drv.c    | 12 +++---------
>  drivers/gpu/drm/imx/dcss/dcss-dtg.c    | 23 ++++-------------------
>  drivers/gpu/drm/imx/dcss/dcss-scaler.c | 24 +++++-------------------
>  drivers/gpu/drm/imx/dcss/dcss-ss.c     | 11 +++--------
>  9 files changed, 30 insertions(+), 107 deletions(-)
> 
> diff --git a/drivers/gpu/drm/imx/dcss/dcss-blkctl.c b/drivers/gpu/drm/imx/dcss/dcss-blkctl.c
> index c9b54bb2692d..58e12ec65f80 100644
> --- a/drivers/gpu/drm/imx/dcss/dcss-blkctl.c
> +++ b/drivers/gpu/drm/imx/dcss/dcss-blkctl.c
> @@ -41,15 +41,15 @@ void dcss_blkctl_cfg(struct dcss_blkctl *blkctl)
>  int dcss_blkctl_init(struct dcss_dev *dcss, unsigned long blkctl_base)
>  {
>  	struct dcss_blkctl *blkctl;
> +	struct device *dev = dcss->dev;
>  
> -	blkctl = kzalloc(sizeof(*blkctl), GFP_KERNEL);
> +	blkctl = devm_kzalloc(dev, sizeof(*blkctl), GFP_KERNEL);
>  	if (!blkctl)
>  		return -ENOMEM;
>  
> -	blkctl->base_reg = ioremap(blkctl_base, SZ_4K);
> +	blkctl->base_reg = devm_ioremap(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 +60,3 @@ 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..444511d0f382 100644
> --- a/drivers/gpu/drm/imx/dcss/dcss-ctxld.c
> +++ b/drivers/gpu/drm/imx/dcss/dcss-ctxld.c
> @@ -199,10 +199,11 @@ static int dcss_ctxld_alloc_ctx(struct dcss_ctxld *ctxld)
>  
>  int dcss_ctxld_init(struct dcss_dev *dcss, unsigned long ctxld_base)
>  {
> +	struct device *dev = dcss->dev;
>  	struct dcss_ctxld *ctxld;
>  	int ret;
>  
> -	ctxld = kzalloc(sizeof(*ctxld), GFP_KERNEL);
> +	ctxld = devm_kzalloc(dev, sizeof(*ctxld), GFP_KERNEL);
>  	if (!ctxld)
>  		return -ENOMEM;
>  
> @@ -217,7 +218,7 @@ 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(dev, ctxld_base, SZ_4K);
>  	if (!ctxld->ctxld_reg) {
>  		dev_err(dcss->dev, "ctxld: unable to remap ctxld base\n");
>  		ret = -ENOMEM;
> @@ -226,18 +227,14 @@ 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 +243,7 @@ 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..d6b2ad5e6977 100644
> --- a/drivers/gpu/drm/imx/dcss/dcss-dpr.c
> +++ b/drivers/gpu/drm/imx/dcss/dcss-dpr.c
> @@ -125,7 +125,8 @@ static void dcss_dpr_write(struct dcss_dpr_ch *ch, u32 val, u32 ofs)
>  	dcss_ctxld_write(dpr->ctxld, dpr->ctx_id, val, ch->base_ofs + ofs);
>  }
>  
> -static int dcss_dpr_ch_init_all(struct dcss_dpr *dpr, unsigned long dpr_base)
> +static int dcss_dpr_ch_init_all(struct device *dev, struct dcss_dpr *dpr,
> +		unsigned long dpr_base)
>  {
>  	struct dcss_dpr_ch *ch;
>  	int i;
> @@ -135,7 +136,7 @@ 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(dev, ch->base_ofs, SZ_4K);
>  		if (!ch->base_reg) {
>  			dev_err(dpr->dev, "dpr: unable to remap ch %d base\n",
>  				i);
> @@ -154,8 +155,9 @@ static int dcss_dpr_ch_init_all(struct dcss_dpr *dpr, unsigned long dpr_base)
>  int dcss_dpr_init(struct dcss_dev *dcss, unsigned long dpr_base)
>  {
>  	struct dcss_dpr *dpr;
> +	struct device *dev = dcss->dev;
>  
> -	dpr = kzalloc(sizeof(*dpr), GFP_KERNEL);
> +	dpr = devm_kzalloc(dev, sizeof(*dpr), GFP_KERNEL);
>  	if (!dpr)
>  		return -ENOMEM;
>  
> @@ -164,18 +166,8 @@ 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(dev, dpr, dpr_base))
>  		return -ENOMEM;
> -	}
>  
>  	return 0;
>  }
> @@ -189,12 +181,7 @@ 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 b61cec0cc79d..bd3f9d58042c 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;
>  }
>  
> @@ -87,8 +83,6 @@ static int dcss_drv_platform_remove(struct platform_device *pdev)

I think you are on a slightly old kernel version. The remove() callback
in the latest kernels returns void. Hence the patch does not apply
cleanly.

>  	dcss_kms_detach(mdrv->kms);
>  	dcss_dev_destroy(mdrv->dcss);
>  
> -	kfree(mdrv);
> -
>  	return 0;
>  }
>  
> diff --git a/drivers/gpu/drm/imx/dcss/dcss-dtg.c b/drivers/gpu/drm/imx/dcss/dcss-dtg.c
> index 30de00540f63..5c0f697587e6 100644
> --- a/drivers/gpu/drm/imx/dcss/dcss-dtg.c
> +++ b/drivers/gpu/drm/imx/dcss/dcss-dtg.c
> @@ -151,8 +151,9 @@ int dcss_dtg_init(struct dcss_dev *dcss, unsigned long dtg_base)
>  {
>  	int ret = 0;
>  	struct dcss_dtg *dtg;
> +	struct device *dev = dcss->dev;
>  
> -	dtg = kzalloc(sizeof(*dtg), GFP_KERNEL);
> +	dtg = devm_kzalloc(dev, sizeof(*dtg), GFP_KERNEL);
>  	if (!dtg)
>  		return -ENOMEM;
>  
> @@ -160,11 +161,10 @@ 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(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;
> +		return -ENOMEM;
>  	}
>  
>  	dtg->base_ofs = dtg_base;
> @@ -176,16 +176,6 @@ int dcss_dtg_init(struct dcss_dev *dcss, unsigned long dtg_base)
>  		((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);
>  
>  	return ret;
>  }
> @@ -193,11 +183,6 @@ 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..ed4d1eb9442e 100644
> --- a/drivers/gpu/drm/imx/dcss/dcss-scaler.c
> +++ b/drivers/gpu/drm/imx/dcss/dcss-scaler.c
> @@ -291,7 +291,7 @@ static void dcss_scaler_write(struct dcss_scaler_ch *ch, u32 val, u32 ofs)
>  	dcss_ctxld_write(scl->ctxld, scl->ctx_id, val, ch->base_ofs + ofs);
>  }
>  
> -static int dcss_scaler_ch_init_all(struct dcss_scaler *scl,
> +static int dcss_scaler_ch_init_all(struct device *dev, struct dcss_scaler *scl,

No need to add 'dev' as an argument to this function. You can use
'scl->dev'.

>  				   unsigned long scaler_base)
>  {
>  	struct dcss_scaler_ch *ch;
> @@ -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(dev, ch->base_ofs, SZ_4K);
>  		if (!ch->base_reg) {
>  			dev_err(scl->dev, "scaler: unable to remap ch base\n");
>  			return -ENOMEM;
> @@ -317,8 +317,9 @@ static int dcss_scaler_ch_init_all(struct dcss_scaler *scl,
>  int dcss_scaler_init(struct dcss_dev *dcss, unsigned long scaler_base)
>  {
>  	struct dcss_scaler *scaler;
> +	struct device *dev = dcss->dev;

Do you really need this extra variable? Why not use dcss->dev directly?
It's only used in a couple of places in this function.

>  
> -	scaler = kzalloc(sizeof(*scaler), GFP_KERNEL);
> +	scaler = devm_kzalloc(dev, sizeof(*scaler), GFP_KERNEL);
>  	if (!scaler)
>  		return -ENOMEM;
>  
> @@ -327,18 +328,8 @@ 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(dev, scaler, scaler_base))

As I mentioned above, dev is already part of dcss_scaler structure.

Thanks,
Laurentiu

>  		return -ENOMEM;
> -	}
>  
>  	return 0;
>  }
> @@ -351,12 +342,7 @@ 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..0a8320adc302 100644
> --- a/drivers/gpu/drm/imx/dcss/dcss-ss.c
> +++ b/drivers/gpu/drm/imx/dcss/dcss-ss.c
> @@ -82,8 +82,9 @@ static void dcss_ss_write(struct dcss_ss *ss, u32 val, u32 ofs)
>  int dcss_ss_init(struct dcss_dev *dcss, unsigned long ss_base)
>  {
>  	struct dcss_ss *ss;
> +	struct device *dev = dcss->dev;
>  
> -	ss = kzalloc(sizeof(*ss), GFP_KERNEL);
> +	ss = devm_kzalloc(dev, sizeof(*ss), GFP_KERNEL);
>  	if (!ss)
>  		return -ENOMEM;
>  
> @@ -91,10 +92,9 @@ 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(dev, ss_base, SZ_4K);
>  	if (!ss->base_reg) {
>  		dev_err(dcss->dev, "ss: unable to remap ss base\n");
> -		kfree(ss);
>  		return -ENOMEM;
>  	}
>  
> @@ -108,11 +108,6 @@ 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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