Module Name: src
Committed By: tnn
Date: Tue Jun 4 19:49:43 UTC 2019
Modified Files:
src/sys/arch/arm/sunxi: sunxi_gpio.c
Log Message:
sunxi_gpio: set interrupt debounce filter to HOSC instead of LOSC
This improves gpio ISR response time from ~1.5ms to ~5us.
The hardware debounce filter is of limited value anyway because if we
at some point want to support interrupts from mechanical switches in
gpiobutton(4) it will still need a software debounce filter to be portable
to devices without hardware debouncing capability.
To generate a diff of this commit:
cvs rdiff -u -r1.25 -r1.26 src/sys/arch/arm/sunxi/sunxi_gpio.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/arch/arm/sunxi/sunxi_gpio.c
diff -u src/sys/arch/arm/sunxi/sunxi_gpio.c:1.25 src/sys/arch/arm/sunxi/sunxi_gpio.c:1.26
--- src/sys/arch/arm/sunxi/sunxi_gpio.c:1.25 Thu May 30 18:19:36 2019
+++ src/sys/arch/arm/sunxi/sunxi_gpio.c Tue Jun 4 19:49:43 2019
@@ -1,4 +1,4 @@
-/* $NetBSD: sunxi_gpio.c,v 1.25 2019/05/30 18:19:36 tnn Exp $ */
+/* $NetBSD: sunxi_gpio.c,v 1.26 2019/06/04 19:49:43 tnn Exp $ */
/*-
* Copyright (c) 2017 Jared McNeill <jmcne...@invisible.ca>
@@ -29,7 +29,7 @@
#include "opt_soc.h"
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: sunxi_gpio.c,v 1.25 2019/05/30 18:19:36 tnn Exp $");
+__KERNEL_RCSID(0, "$NetBSD: sunxi_gpio.c,v 1.26 2019/06/04 19:49:43 tnn Exp $");
#include <sys/param.h>
#include <sys/bus.h>
@@ -72,6 +72,9 @@ __KERNEL_RCSID(0, "$NetBSD: sunxi_gpio.c
#define SUNXI_GPIO_INT_MODE_DOUBLE_EDGE 0x4
#define SUNXI_GPIO_INT_CTL(bank) (0x210 + 0x20 * (bank))
#define SUNXI_GPIO_INT_STATUS(bank) (0x214 + 0x20 * (bank))
+#define SUNXI_GPIO_INT_DEBOUNCE(bank) (0x218 + 0x20 * (bank))
+#define SUNXI_GPIO_INT_DEBOUNCE_CLK_PRESCALE __BITS(6,4)
+#define SUNXI_GPIO_INT_DEBOUNCE_CLK_SEL __BIT(0)
#define SUNXI_GPIO_GRP_CONFIG(bank) (0x300 + 0x4 * (bank))
#define SUNXI_GPIO_GRP_IO_BIAS_CONFIGMASK 0xf
@@ -480,6 +483,9 @@ sunxi_intr_enable(struct sunxi_gpio_soft
val |= __SHIFTIN(mode, SUNXI_GPIO_INT_MODEMASK(eint->eint_num));
GPIO_WRITE(sc, SUNXI_GPIO_INT_CFG(eint->eint_bank, eint->eint_num), val);
+ val = SUNXI_GPIO_INT_DEBOUNCE_CLK_SEL;
+ GPIO_WRITE(sc, SUNXI_GPIO_INT_DEBOUNCE(eint->eint_bank), val);
+
/* Enable eint */
val = GPIO_READ(sc, SUNXI_GPIO_INT_CTL(eint->eint_bank));
val |= __BIT(eint->eint_num);
