[PATCH v1 5/5] rockchip: gpio: fix debounce config error

[Ye Zhang]

1. Prevent data from crossing boundaries
2. Support GPIO_TYPE_V2_2 debounce config
3. fix rockchip_gpio_set_config

Signed-off-by: Ye Zhang <ye.zhang at rock-chips.com>
---
 drivers/gpio/gpio-rockchip.c | 42 ++++++++++++++++++++++--------------
 1 file changed, 26 insertions(+), 16 deletions(-)

diff --git a/drivers/gpio/gpio-rockchip.c b/drivers/gpio/gpio-rockchip.c
index 03e949b0a344..186d8c750fce 100644
--- a/drivers/gpio/gpio-rockchip.c
+++ b/drivers/gpio/gpio-rockchip.c
@@ -84,7 +84,7 @@ static inline void rockchip_gpio_writel(struct rockchip_pin_bank *bank,
 {
 	void __iomem *reg = bank->reg_base + offset;
 
-	if (bank->gpio_type == GPIO_TYPE_V2)
+	if (bank->gpio_type >= GPIO_TYPE_V2)
 		gpio_writel_v2(value, reg);
 	else
 		writel(value, reg);
@@ -96,7 +96,7 @@ static inline u32 rockchip_gpio_readl(struct rockchip_pin_bank *bank,
 	void __iomem *reg = bank->reg_base + offset;
 	u32 value;
 
-	if (bank->gpio_type == GPIO_TYPE_V2)
+	if (bank->gpio_type >= GPIO_TYPE_V2)
 		value = gpio_readl_v2(reg);
 	else
 		value = readl(reg);
@@ -111,7 +111,7 @@ static inline void rockchip_gpio_writel_bit(struct rockchip_pin_bank *bank,
 	void __iomem *reg = bank->reg_base + offset;
 	u32 data;
 
-	if (bank->gpio_type == GPIO_TYPE_V2) {
+	if (bank->gpio_type >= GPIO_TYPE_V2) {
 		if (value)
 			data = BIT(bit % 16) | BIT(bit % 16 + 16);
 		else
@@ -132,7 +132,7 @@ static inline u32 rockchip_gpio_readl_bit(struct rockchip_pin_bank *bank,
 	void __iomem *reg = bank->reg_base + offset;
 	u32 data;
 
-	if (bank->gpio_type == GPIO_TYPE_V2) {
+	if (bank->gpio_type >= GPIO_TYPE_V2) {
 		data = readl(bit >= 16 ? reg + 0x4 : reg);
 		data >>= bit % 16;
 	} else {
@@ -209,19 +209,25 @@ static int rockchip_gpio_set_debounce(struct gpio_chip *gc,
 	unsigned int cur_div_reg;
 	u64 div;
 
-	if (bank->gpio_type == GPIO_TYPE_V2 && !IS_ERR(bank->db_clk)) {
-		div_debounce_support = true;
+	div_debounce_support = (bank->gpio_type >= GPIO_TYPE_V2) && !IS_ERR(bank->db_clk);
+	if (debounce && div_debounce_support) {
 		freq = clk_get_rate(bank->db_clk);
 		if (!freq)
 			return -EINVAL;
-		max_debounce = (GENMASK(23, 0) + 1) * 2 * 1000000 / freq;
+
+		div = (u64)(GENMASK(23, 0) + 1) * 1000000;
+		if (bank->gpio_type == GPIO_TYPE_V2)
+			max_debounce = DIV_ROUND_CLOSEST_ULL(div, freq);
+		else
+			max_debounce = DIV_ROUND_CLOSEST_ULL(div, 2 * freq);
 		if ((unsigned long)debounce > max_debounce)
 			return -EINVAL;
 
-		div = debounce * freq;
-		div_reg = DIV_ROUND_CLOSEST_ULL(div, 2 * USEC_PER_SEC) - 1;
-	} else {
-		div_debounce_support = false;
+		div = (u64)debounce * freq;
+		if (bank->gpio_type == GPIO_TYPE_V2)
+			div_reg = DIV_ROUND_CLOSEST_ULL(div, USEC_PER_SEC) - 1;
+		else
+			div_reg = DIV_ROUND_CLOSEST_ULL(div, USEC_PER_SEC / 2) - 1;
 	}
 
 	raw_spin_lock_irqsave(&bank->slock, flags);
@@ -284,10 +290,11 @@ static int rockchip_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
 				  unsigned long config)
 {
 	enum pin_config_param param = pinconf_to_config_param(config);
+	unsigned int debounce = pinconf_to_config_argument(config);
 
 	switch (param) {
 	case PIN_CONFIG_INPUT_DEBOUNCE:
-		rockchip_gpio_set_debounce(gc, offset, true);
+		rockchip_gpio_set_debounce(gc, offset, debounce);
 		/*
 		 * Rockchip's gpio could only support up to one period
 		 * of the debounce clock(pclk), which is far away from
@@ -416,7 +423,7 @@ static int rockchip_irq_set_type(struct irq_data *d, unsigned int type)
 	polarity = rockchip_gpio_readl(bank, bank->gpio_regs->int_polarity);
 
 	if (type == IRQ_TYPE_EDGE_BOTH) {
-		if (bank->gpio_type == GPIO_TYPE_V2) {
+		if (bank->gpio_type >= GPIO_TYPE_V2) {
 			rockchip_gpio_writel_bit(bank, d->hwirq, 1,
 						 bank->gpio_regs->int_bothedge);
 			goto out;
@@ -435,7 +442,7 @@ static int rockchip_irq_set_type(struct irq_data *d, unsigned int type)
 				polarity |= mask;
 		}
 	} else {
-		if (bank->gpio_type == GPIO_TYPE_V2) {
+		if (bank->gpio_type >= GPIO_TYPE_V2) {
 			rockchip_gpio_writel_bit(bank, d->hwirq, 0,
 						 bank->gpio_regs->int_bothedge);
 		} else {
@@ -543,7 +550,7 @@ static int rockchip_interrupts_register(struct rockchip_pin_bank *bank)
 	}
 
 	gc = irq_get_domain_generic_chip(bank->domain, 0);
-	if (bank->gpio_type == GPIO_TYPE_V2) {
+	if (bank->gpio_type >= GPIO_TYPE_V2) {
 		gc->reg_writel = gpio_writel_v2;
 		gc->reg_readl = gpio_readl_v2;
 	}
@@ -632,10 +639,13 @@ static void rockchip_gpio_get_ver(struct rockchip_pin_bank *bank)
 	switch (id) {
 	case GPIO_TYPE_V2:
 	case GPIO_TYPE_V2_1:
-	case GPIO_TYPE_V2_2:
 		bank->gpio_regs = &gpio_regs_v2;
 		bank->gpio_type = GPIO_TYPE_V2;
 		break;
+	case GPIO_TYPE_V2_2:
+		bank->gpio_regs = &gpio_regs_v2;
+		bank->gpio_type = GPIO_TYPE_V2_2;
+		break;
 	default:
 		bank->gpio_regs = &gpio_regs_v1;
 		bank->gpio_type = GPIO_TYPE_V1;
-- 
2.34.1