gpio: omap: fix omap2_set_gpio_debounce
According to TRMs:
Required input line stable =
(the value of the GPIO_DEBOUNCINGTIME[7:0].DEBOUNCETIME + 1) × 31,
where the value of the GPIO_DEBOUNCINGTIME[7:0].DEBOUNCETIME bit field
is from 0 to 255.
But now omap2_set_gpio_debounce() will calculate debounce time and
behave incorrectly in the following cases:
1) requested debounce time is !0 and <32
calculated DEBOUNCETIME = 0x1 == 62 us;
expected value of DEBOUNCETIME = 0x0 == 31us
2) requested debounce time is 0
calculated DEBOUNCETIME = 0x1 == 62 us;
expected: disable debounce and DEBOUNCETIME = 0x0
3) requested debounce time is >32 and <63
calculated DEBOUNCETIME = 0x0 and debounce will be disabled;
expected: enable debounce and DEBOUNCETIME = 0x1 == 62 us
Hence, rework omap2_set_gpio_debounce() to fix above cases:
1) introduce local variable "enable" and use it to identify
when debounce need to be enabled or disabled. Disable debounce
if requested debounce time is 0.
2) use below formula for debounce time calculation:
debounce = (DIV_ROUND_UP(debounce, 31) - 1) & 0xFF;
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Acked-by: Santosh Shilimkar <ssantosh@kernel.org>
Tested-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/gpio/gpio-omap.c b/drivers/gpio/gpio-omap.c
index 03fd111..9ed5a67 100644
--- a/drivers/gpio/gpio-omap.c
+++ b/drivers/gpio/gpio-omap.c
@@ -29,6 +29,7 @@
#include <linux/platform_data/gpio-omap.h>
#define OFF_MODE 1
+#define OMAP4_GPIO_DEBOUNCINGTIME_MASK 0xFF
static LIST_HEAD(omap_gpio_list);
@@ -204,8 +205,9 @@
* @offset: the gpio number on this @bank
* @debounce: debounce time to use
*
- * OMAP's debounce time is in 31us steps so we need
- * to convert and round up to the closest unit.
+ * OMAP's debounce time is in 31us steps
+ * <debounce time> = (GPIO_DEBOUNCINGTIME[7:0].DEBOUNCETIME + 1) x 31
+ * so we need to convert and round up to the closest unit.
*/
static void omap2_set_gpio_debounce(struct gpio_bank *bank, unsigned offset,
unsigned debounce)
@@ -213,16 +215,15 @@
void __iomem *reg;
u32 val;
u32 l;
+ bool enable = !!debounce;
if (!bank->dbck_flag)
return;
- if (debounce < 32)
- debounce = 0x01;
- else if (debounce > 7936)
- debounce = 0xff;
- else
- debounce = (debounce / 0x1f) - 1;
+ if (enable) {
+ debounce = DIV_ROUND_UP(debounce, 31) - 1;
+ debounce &= OMAP4_GPIO_DEBOUNCINGTIME_MASK;
+ }
l = BIT(offset);
@@ -233,7 +234,7 @@
reg = bank->base + bank->regs->debounce_en;
val = readl_relaxed(reg);
- if (debounce)
+ if (enable)
val |= l;
else
val &= ~l;