[PATCH v2 0/5] media: rc: meson-ir: series with smaller improvements

[PATCH v2 0/5] media: rc: meson-ir: series with smaller improvements

[Heiner Kallweit]

This series includes smaller improvements for the meson-ir driver.
Tested on a Odroid C2.

v2:
- minor change to patch 2
- added Reviewed-by to patch 2, 3, 4

Heiner Kallweit (5):
  media: rc: meson-ir: remove irq from struct meson_ir
  media: rc: meson-ir: make use of the bitfield macros
  media: rc: meson-ir: switch to managed rc device allocation / registration
  media: rc: meson-ir: use readl_relaxed in the interrupt handler
  media: rc: meson-ir: change irq name to to of node name

 drivers/media/rc/meson-ir.c | 64 ++++++++++++++++++---------------------------
 1 file changed, 26 insertions(+), 38 deletions(-)

-- 
2.12.2

[PATCH v2 1/5] media: rc: meson-ir: remove irq from struct meson_ir

[Heiner Kallweit]

The irq number is used in the probe function only, therefore just use
a local variable.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
v2:
- no changes
---
 drivers/media/rc/meson-ir.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/media/rc/meson-ir.c b/drivers/media/rc/meson-ir.c
index 5576dbd6..a4128d7c 100644
--- a/drivers/media/rc/meson-ir.c
+++ b/drivers/media/rc/meson-ir.c
@@ -68,7 +68,6 @@
 struct meson_ir {
 	void __iomem	*reg;
 	struct rc_dev	*rc;
-	int		irq;
 	spinlock_t	lock;
 };
 
@@ -112,7 +111,7 @@ static int meson_ir_probe(struct platform_device *pdev)
 	struct resource *res;
 	const char *map_name;
 	struct meson_ir *ir;
-	int ret;
+	int irq, ret;
 
 	ir = devm_kzalloc(dev, sizeof(struct meson_ir), GFP_KERNEL);
 	if (!ir)
@@ -125,10 +124,10 @@ static int meson_ir_probe(struct platform_device *pdev)
 		return PTR_ERR(ir->reg);
 	}
 
-	ir->irq = platform_get_irq(pdev, 0);
-	if (ir->irq < 0) {
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
 		dev_err(dev, "no irq resource\n");
-		return ir->irq;
+		return irq;
 	}
 
 	ir->rc = rc_allocate_device(RC_DRIVER_IR_RAW);
@@ -158,7 +157,7 @@ static int meson_ir_probe(struct platform_device *pdev)
 		goto out_free;
 	}
 
-	ret = devm_request_irq(dev, ir->irq, meson_ir_irq, 0, "ir-meson", ir);
+	ret = devm_request_irq(dev, irq, meson_ir_irq, 0, "ir-meson", ir);
 	if (ret) {
 		dev_err(dev, "failed to request irq\n");
 		goto out_unreg;
-- 
2.12.2

[PATCH v2 2/5] media: rc: meson-ir: make use of the bitfield macros

[Heiner Kallweit]

Make use of the bitfield macros thus partially hiding the complexity
of dealing with bitfields.

The patch also includes a minor fix to REG0_RATE_MASK, so far it was
set to bit 0..10, but according to the spec it's bit 0..11.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
---
v2:
- revert change in meson_ir_set_mask
- add R-b
---
 drivers/media/rc/meson-ir.c | 26 ++++++++++++--------------
 1 file changed, 12 insertions(+), 14 deletions(-)

diff --git a/drivers/media/rc/meson-ir.c b/drivers/media/rc/meson-ir.c
index a4128d7c..3864ebe3 100644
--- a/drivers/media/rc/meson-ir.c
+++ b/drivers/media/rc/meson-ir.c
@@ -19,6 +19,7 @@
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
 #include <linux/spinlock.h>
+#include <linux/bitfield.h>
 
 #include <media/rc-core.h>
 
@@ -36,27 +37,24 @@
 /* only available on Meson 8b and newer */
 #define IR_DEC_REG2		0x20
 
-#define REG0_RATE_MASK		(BIT(11) - 1)
+#define REG0_RATE_MASK		GENMASK(11, 0)
 
 #define DECODE_MODE_NEC		0x0
 #define DECODE_MODE_RAW		0x2
 
 /* Meson 6b uses REG1 to configure the mode */
 #define REG1_MODE_MASK		GENMASK(8, 7)
-#define REG1_MODE_SHIFT		7
 
 /* Meson 8b / GXBB use REG2 to configure the mode */
 #define REG2_MODE_MASK		GENMASK(3, 0)
-#define REG2_MODE_SHIFT		0
 
-#define REG1_TIME_IV_SHIFT	16
-#define REG1_TIME_IV_MASK	((BIT(13) - 1) << REG1_TIME_IV_SHIFT)
+#define REG1_TIME_IV_MASK	GENMASK(28, 16)
 
-#define REG1_IRQSEL_MASK	(BIT(2) | BIT(3))
-#define REG1_IRQSEL_NEC_MODE	(0 << 2)
-#define REG1_IRQSEL_RISE_FALL	(1 << 2)
-#define REG1_IRQSEL_FALL	(2 << 2)
-#define REG1_IRQSEL_RISE	(3 << 2)
+#define REG1_IRQSEL_MASK	GENMASK(3, 2)
+#define REG1_IRQSEL_NEC_MODE	0
+#define REG1_IRQSEL_RISE_FALL	1
+#define REG1_IRQSEL_FALL	2
+#define REG1_IRQSEL_RISE	3
 
 #define REG1_RESET		BIT(0)
 #define REG1_ENABLE		BIT(15)
@@ -91,7 +89,7 @@ static irqreturn_t meson_ir_irq(int irqno, void *dev_id)
 	spin_lock(&ir->lock);
 
 	duration = readl(ir->reg + IR_DEC_REG1);
-	duration = (duration & REG1_TIME_IV_MASK) >> REG1_TIME_IV_SHIFT;
+	duration = FIELD_GET(REG1_TIME_IV_MASK, duration);
 	rawir.duration = US_TO_NS(duration * MESON_TRATE);
 
 	rawir.pulse = !!(readl(ir->reg + IR_DEC_STATUS) & STATUS_IR_DEC_IN);
@@ -170,16 +168,16 @@ static int meson_ir_probe(struct platform_device *pdev)
 	/* Set general operation mode (= raw/software decoding) */
 	if (of_device_is_compatible(node, "amlogic,meson6-ir"))
 		meson_ir_set_mask(ir, IR_DEC_REG1, REG1_MODE_MASK,
-				  DECODE_MODE_RAW << REG1_MODE_SHIFT);
+				  FIELD_PREP(REG1_MODE_MASK, DECODE_MODE_RAW));
 	else
 		meson_ir_set_mask(ir, IR_DEC_REG2, REG2_MODE_MASK,
-				  DECODE_MODE_RAW << REG2_MODE_SHIFT);
+				  FIELD_PREP(REG2_MODE_MASK, DECODE_MODE_RAW));
 
 	/* Set rate */
 	meson_ir_set_mask(ir, IR_DEC_REG0, REG0_RATE_MASK, MESON_TRATE - 1);
 	/* IRQ on rising and falling edges */
 	meson_ir_set_mask(ir, IR_DEC_REG1, REG1_IRQSEL_MASK,
-			  REG1_IRQSEL_RISE_FALL);
+			  FIELD_PREP(REG1_IRQSEL_MASK, REG1_IRQSEL_RISE_FALL));
 	/* Enable the decoder */
 	meson_ir_set_mask(ir, IR_DEC_REG1, REG1_ENABLE, REG1_ENABLE);
 
-- 
2.12.2

[PATCH v2 3/5] media: rc: meson-ir: switch to managed rc device allocation / registration

[Heiner Kallweit]

Switch to the managed versions of rc_allocate_device/rc_register_device,
thus simplifying the code.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
---
v2:
- added R-b
---
 drivers/media/rc/meson-ir.c | 18 ++++--------------
 1 file changed, 4 insertions(+), 14 deletions(-)

diff --git a/drivers/media/rc/meson-ir.c b/drivers/media/rc/meson-ir.c
index 3864ebe3..cf8943d2 100644
--- a/drivers/media/rc/meson-ir.c
+++ b/drivers/media/rc/meson-ir.c
@@ -128,7 +128,7 @@ static int meson_ir_probe(struct platform_device *pdev)
 		return irq;
 	}
 
-	ir->rc = rc_allocate_device(RC_DRIVER_IR_RAW);
+	ir->rc = devm_rc_allocate_device(dev, RC_DRIVER_IR_RAW);
 	if (!ir->rc) {
 		dev_err(dev, "failed to allocate rc device\n");
 		return -ENOMEM;
@@ -140,7 +140,6 @@ static int meson_ir_probe(struct platform_device *pdev)
 	ir->rc->input_id.bustype = BUS_HOST;
 	map_name = of_get_property(node, "linux,rc-map-name", NULL);
 	ir->rc->map_name = map_name ? map_name : RC_MAP_EMPTY;
-	ir->rc->dev.parent = dev;
 	ir->rc->allowed_protocols = RC_BIT_ALL_IR_DECODER;
 	ir->rc->rx_resolution = US_TO_NS(MESON_TRATE);
 	ir->rc->timeout = MS_TO_NS(200);
@@ -149,16 +148,16 @@ static int meson_ir_probe(struct platform_device *pdev)
 	spin_lock_init(&ir->lock);
 	platform_set_drvdata(pdev, ir);
 
-	ret = rc_register_device(ir->rc);
+	ret = devm_rc_register_device(dev, ir->rc);
 	if (ret) {
 		dev_err(dev, "failed to register rc device\n");
-		goto out_free;
+		return ret;
 	}
 
 	ret = devm_request_irq(dev, irq, meson_ir_irq, 0, "ir-meson", ir);
 	if (ret) {
 		dev_err(dev, "failed to request irq\n");
-		goto out_unreg;
+		return ret;
 	}
 
 	/* Reset the decoder */
@@ -184,13 +183,6 @@ static int meson_ir_probe(struct platform_device *pdev)
 	dev_info(dev, "receiver initialized\n");
 
 	return 0;
-out_unreg:
-	rc_unregister_device(ir->rc);
-	ir->rc = NULL;
-out_free:
-	rc_free_device(ir->rc);
-
-	return ret;
 }
 
 static int meson_ir_remove(struct platform_device *pdev)
@@ -203,8 +195,6 @@ static int meson_ir_remove(struct platform_device *pdev)
 	meson_ir_set_mask(ir, IR_DEC_REG1, REG1_ENABLE, 0);
 	spin_unlock_irqrestore(&ir->lock, flags);
 
-	rc_unregister_device(ir->rc);
-
 	return 0;
 }
 
-- 
2.12.2

[PATCH v2 4/5] media: rc: meson-ir: use readl_relaxed in the interrupt handler

[Heiner Kallweit]

We don't need the memory barriers here and an interrupt handler should
be as fast as possible. Therefore switch to readl_relaxed.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
---
v2:
- added R-b
---
 drivers/media/rc/meson-ir.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/media/rc/meson-ir.c b/drivers/media/rc/meson-ir.c
index cf8943d2..1c72593d 100644
--- a/drivers/media/rc/meson-ir.c
+++ b/drivers/media/rc/meson-ir.c
@@ -83,16 +83,17 @@ static void meson_ir_set_mask(struct meson_ir *ir, unsigned int reg,
 static irqreturn_t meson_ir_irq(int irqno, void *dev_id)
 {
 	struct meson_ir *ir = dev_id;
-	u32 duration;
+	u32 duration, status;
 	DEFINE_IR_RAW_EVENT(rawir);
 
 	spin_lock(&ir->lock);
 
-	duration = readl(ir->reg + IR_DEC_REG1);
+	duration = readl_relaxed(ir->reg + IR_DEC_REG1);
 	duration = FIELD_GET(REG1_TIME_IV_MASK, duration);
 	rawir.duration = US_TO_NS(duration * MESON_TRATE);
 
-	rawir.pulse = !!(readl(ir->reg + IR_DEC_STATUS) & STATUS_IR_DEC_IN);
+	status = readl_relaxed(ir->reg + IR_DEC_STATUS);
+	rawir.pulse = !!(status & STATUS_IR_DEC_IN);
 
 	ir_raw_event_store_with_filter(ir->rc, &rawir);
 	ir_raw_event_handle(ir->rc);
-- 
2.12.2

[PATCH v2 5/5] media: rc: meson-ir: change irq name to to of node name

[Heiner Kallweit]

Switch the interrupt description to the default which is the of node
name. This is more in line with the interrupt descriptions in
other meson drivers.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
v2:
- no changes
---
 drivers/media/rc/meson-ir.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/rc/meson-ir.c b/drivers/media/rc/meson-ir.c
index 1c72593d..1ece3c04 100644
--- a/drivers/media/rc/meson-ir.c
+++ b/drivers/media/rc/meson-ir.c
@@ -155,7 +155,7 @@ static int meson_ir_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	ret = devm_request_irq(dev, irq, meson_ir_irq, 0, "ir-meson", ir);
+	ret = devm_request_irq(dev, irq, meson_ir_irq, 0, NULL, ir);
 	if (ret) {
 		dev_err(dev, "failed to request irq\n");
 		return ret;
-- 
2.12.2