diff mbox series

[1/3] Input: matrix_keypad - avoid repeatedly converting GPIO to IRQ

Message ID 20240121053232.276968-1-dmitry.torokhov@gmail.com
State Accepted
Commit a96fb711c6be76bcfbcf594a865002fa7c0eb525
Headers show
Series [1/3] Input: matrix_keypad - avoid repeatedly converting GPIO to IRQ | expand

Commit Message

Dmitry Torokhov Jan. 21, 2024, 5:32 a.m. UTC 
gpio_to_irq() is getting more expensive and may require sleeping.
Convert row GPIOs to interrupt numbers once in probe() and use
this information when the driver needs to enable or disable given
interrupt line.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
---
 drivers/input/keyboard/matrix_keypad.c | 48 ++++++++++++++------------
 1 file changed, 25 insertions(+), 23 deletions(-)

Comments

Dmitry Torokhov Jan. 31, 2024, 6:48 p.m. UTC | #1 
On Mon, Jan 22, 2024 at 09:19:56AM +0100, Bartosz Golaszewski wrote:
> On Sun, 21 Jan 2024 at 06:32, Dmitry Torokhov <dmitry.torokhov@gmail.com> wrote:
> >
> > gpio_to_irq() is getting more expensive and may require sleeping.
> 
> This is no longer true, the relevant commit was reverted and I have
> now a working series where I'm using SRCU for lockless list traversal
> so if anything it will actually become cheaper.
> 
> > Convert row GPIOs to interrupt numbers once in probe() and use
> > this information when the driver needs to enable or disable given
> > interrupt line.
> 
> That being said, I'm not against this change, though this may not be
> very useful after all.

OK, then I'll tone down the patch description and apply.

Thanks.
diff mbox series

Patch

diff --git a/drivers/input/keyboard/matrix_keypad.c b/drivers/input/keyboard/matrix_keypad.c
index 50fa764c82d2..1cd1ffb80401 100644
--- a/drivers/input/keyboard/matrix_keypad.c
+++ b/drivers/input/keyboard/matrix_keypad.c
@@ -27,6 +27,7 @@  struct matrix_keypad {
 	const struct matrix_keypad_platform_data *pdata;
 	struct input_dev *input_dev;
 	unsigned int row_shift;
+	unsigned int row_irqs[MATRIX_MAX_ROWS];
 
 	DECLARE_BITMAP(disabled_gpios, MATRIX_MAX_ROWS);
 
@@ -92,7 +93,7 @@  static void enable_row_irqs(struct matrix_keypad *keypad)
 		enable_irq(pdata->clustered_irq);
 	else {
 		for (i = 0; i < pdata->num_row_gpios; i++)
-			enable_irq(gpio_to_irq(pdata->row_gpios[i]));
+			enable_irq(keypad->row_irqs[i]);
 	}
 }
 
@@ -105,7 +106,7 @@  static void disable_row_irqs(struct matrix_keypad *keypad)
 		disable_irq_nosync(pdata->clustered_irq);
 	else {
 		for (i = 0; i < pdata->num_row_gpios; i++)
-			disable_irq_nosync(gpio_to_irq(pdata->row_gpios[i]));
+			disable_irq_nosync(keypad->row_irqs[i]);
 	}
 }
 
@@ -233,7 +234,6 @@  static void matrix_keypad_stop(struct input_dev *dev)
 static void matrix_keypad_enable_wakeup(struct matrix_keypad *keypad)
 {
 	const struct matrix_keypad_platform_data *pdata = keypad->pdata;
-	unsigned int gpio;
 	int i;
 
 	if (pdata->clustered_irq > 0) {
@@ -241,21 +241,16 @@  static void matrix_keypad_enable_wakeup(struct matrix_keypad *keypad)
 			keypad->gpio_all_disabled = true;
 	} else {
 
-		for (i = 0; i < pdata->num_row_gpios; i++) {
-			if (!test_bit(i, keypad->disabled_gpios)) {
-				gpio = pdata->row_gpios[i];
-
-				if (enable_irq_wake(gpio_to_irq(gpio)) == 0)
+		for (i = 0; i < pdata->num_row_gpios; i++)
+			if (!test_bit(i, keypad->disabled_gpios))
+				if (enable_irq_wake(keypad->row_irqs[i]) == 0)
 					__set_bit(i, keypad->disabled_gpios);
-			}
-		}
 	}
 }
 
 static void matrix_keypad_disable_wakeup(struct matrix_keypad *keypad)
 {
 	const struct matrix_keypad_platform_data *pdata = keypad->pdata;
-	unsigned int gpio;
 	int i;
 
 	if (pdata->clustered_irq > 0) {
@@ -264,12 +259,9 @@  static void matrix_keypad_disable_wakeup(struct matrix_keypad *keypad)
 			keypad->gpio_all_disabled = false;
 		}
 	} else {
-		for (i = 0; i < pdata->num_row_gpios; i++) {
-			if (test_and_clear_bit(i, keypad->disabled_gpios)) {
-				gpio = pdata->row_gpios[i];
-				disable_irq_wake(gpio_to_irq(gpio));
-			}
-		}
+		for (i = 0; i < pdata->num_row_gpios; i++)
+			if (test_and_clear_bit(i, keypad->disabled_gpios))
+				disable_irq_wake(keypad->row_irqs[i]);
 	}
 }
 
@@ -306,7 +298,7 @@  static int matrix_keypad_init_gpio(struct platform_device *pdev,
 				   struct matrix_keypad *keypad)
 {
 	const struct matrix_keypad_platform_data *pdata = keypad->pdata;
-	int i, err;
+	int i, irq, err;
 
 	/* initialized strobe lines as outputs, activated */
 	for (i = 0; i < pdata->num_col_gpios; i++) {
@@ -345,11 +337,19 @@  static int matrix_keypad_init_gpio(struct platform_device *pdev,
 		}
 	} else {
 		for (i = 0; i < pdata->num_row_gpios; i++) {
-			err = request_any_context_irq(
-					gpio_to_irq(pdata->row_gpios[i]),
+			irq = gpio_to_irq(pdata->row_gpios[i]);
+			if (irq < 0) {
+				err = irq;
+				dev_err(&pdev->dev,
+					"Unable to convert GPIO line %i to irq: %d\n",
+					pdata->row_gpios[i], err);
+				goto err_free_irqs;
+			}
+
+			err = request_any_context_irq(irq,
 					matrix_keypad_interrupt,
 					IRQF_TRIGGER_RISING |
-					IRQF_TRIGGER_FALLING,
+						IRQF_TRIGGER_FALLING,
 					"matrix-keypad", keypad);
 			if (err < 0) {
 				dev_err(&pdev->dev,
@@ -357,6 +357,8 @@  static int matrix_keypad_init_gpio(struct platform_device *pdev,
 					pdata->row_gpios[i]);
 				goto err_free_irqs;
 			}
+
+			keypad->row_irqs[i] = irq;
 		}
 	}
 
@@ -366,7 +368,7 @@  static int matrix_keypad_init_gpio(struct platform_device *pdev,
 
 err_free_irqs:
 	while (--i >= 0)
-		free_irq(gpio_to_irq(pdata->row_gpios[i]), keypad);
+		free_irq(keypad->row_irqs[i], keypad);
 	i = pdata->num_row_gpios;
 err_free_rows:
 	while (--i >= 0)
@@ -388,7 +390,7 @@  static void matrix_keypad_free_gpio(struct matrix_keypad *keypad)
 		free_irq(pdata->clustered_irq, keypad);
 	} else {
 		for (i = 0; i < pdata->num_row_gpios; i++)
-			free_irq(gpio_to_irq(pdata->row_gpios[i]), keypad);
+			free_irq(keypad->row_irqs[i], keypad);
 	}
 
 	for (i = 0; i < pdata->num_row_gpios; i++)