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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>
This commit is contained in:
Grygorii Strashko 2015-08-18 14:10:54 +03:00 committed by Linus Walleij
parent 89d18e3af8
commit e85ec6c304
1 changed files with 10 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
drivers/gpio/gpio-omap.c
View File

@ -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 @@ static inline void omap_gpio_dbck_disable(struct gpio_bank *bank)
* @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 @@ static void omap2_set_gpio_debounce(struct gpio_bank *bank, unsigned offset,
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 @@ static void omap2_set_gpio_debounce(struct gpio_bank *bank, unsigned offset,
reg = bank->base + bank->regs->debounce_en;
val = readl_relaxed(reg);
if (debounce)
if (enable)
val |= l;
else
val &= ~l;