forked from Minki/linux
drm/exynos: dp: support hotplug detection via GPIO
Certain bridge chips use a GPIO to indicate the cable status instead of the I_DP_HPD pin. This adds an optional device-tree property, "samsung,hpd-gpio", to the exynos-dp controller which indicates that the specified GPIO should be used for hotplug detection. The GPIO is then set up as an edge-triggered interrupt where the rising edge indicates hotplug-in and the falling edge indicates hotplug-out. Signed-off-by: Andrew Bresticker <abrestic@chromium.org> Signed-off-by: Rahul Sharma <rahul.sharma@samsung.com> Signed-off-by: Ajay Kumar <ajaykumar.rs@samsung.com> Acked-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Inki Dae <inki.dae@samsung.com>
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@ -62,6 +62,10 @@ Optional properties for dp-controller:
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-hsync-active-high:
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HSYNC polarity configuration.
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High if defined, Low if not defined
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-samsung,hpd-gpio:
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Hotplug detect GPIO.
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Indicates which GPIO should be used for hotplug
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detection
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Example:
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@ -18,6 +18,8 @@
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/of.h>
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#include <linux/of_gpio.h>
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#include <linux/gpio.h>
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#include <linux/component.h>
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#include <linux/phy/phy.h>
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#include <video/of_display_timing.h>
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@ -1217,6 +1219,7 @@ static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
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struct drm_device *drm_dev = data;
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struct resource *res;
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struct exynos_dp_device *dp;
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unsigned int irq_flags;
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int ret = 0;
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@ -1254,7 +1257,30 @@ static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
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if (IS_ERR(dp->reg_base))
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return PTR_ERR(dp->reg_base);
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dp->irq = platform_get_irq(pdev, 0);
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dp->hpd_gpio = of_get_named_gpio(dev->of_node, "samsung,hpd-gpio", 0);
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if (gpio_is_valid(dp->hpd_gpio)) {
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/*
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* Set up the hotplug GPIO from the device tree as an interrupt.
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* Simply specifying a different interrupt in the device tree
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* doesn't work since we handle hotplug rather differently when
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* using a GPIO. We also need the actual GPIO specifier so
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* that we can get the current state of the GPIO.
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*/
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ret = devm_gpio_request_one(&pdev->dev, dp->hpd_gpio, GPIOF_IN,
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"hpd_gpio");
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if (ret) {
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dev_err(&pdev->dev, "failed to get hpd gpio\n");
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return ret;
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}
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dp->irq = gpio_to_irq(dp->hpd_gpio);
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irq_flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING;
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} else {
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dp->hpd_gpio = -ENODEV;
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dp->irq = platform_get_irq(pdev, 0);
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irq_flags = 0;
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}
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if (dp->irq == -ENXIO) {
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dev_err(&pdev->dev, "failed to get irq\n");
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return -ENODEV;
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@ -1266,8 +1292,8 @@ static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
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exynos_dp_init_dp(dp);
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ret = devm_request_irq(&pdev->dev, dp->irq, exynos_dp_irq_handler, 0,
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"exynos-dp", dp);
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ret = devm_request_irq(&pdev->dev, dp->irq, exynos_dp_irq_handler,
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irq_flags, "exynos-dp", dp);
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if (ret) {
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dev_err(&pdev->dev, "failed to request irq\n");
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return ret;
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@ -159,6 +159,7 @@ struct exynos_dp_device {
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struct work_struct hotplug_work;
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struct phy *phy;
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int dpms_mode;
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int hpd_gpio;
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struct exynos_drm_panel_info panel;
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};
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@ -13,6 +13,7 @@
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#include <linux/device.h>
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#include <linux/io.h>
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#include <linux/delay.h>
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#include <linux/gpio.h>
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#include "exynos_dp_core.h"
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#include "exynos_dp_reg.h"
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@ -326,6 +327,9 @@ void exynos_dp_clear_hotplug_interrupts(struct exynos_dp_device *dp)
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{
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u32 reg;
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if (gpio_is_valid(dp->hpd_gpio))
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return;
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reg = HOTPLUG_CHG | HPD_LOST | PLUG;
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writel(reg, dp->reg_base + EXYNOS_DP_COMMON_INT_STA_4);
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@ -337,6 +341,9 @@ void exynos_dp_init_hpd(struct exynos_dp_device *dp)
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{
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u32 reg;
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if (gpio_is_valid(dp->hpd_gpio))
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return;
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exynos_dp_clear_hotplug_interrupts(dp);
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reg = readl(dp->reg_base + EXYNOS_DP_SYS_CTL_3);
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@ -348,19 +355,27 @@ enum dp_irq_type exynos_dp_get_irq_type(struct exynos_dp_device *dp)
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{
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u32 reg;
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/* Parse hotplug interrupt status register */
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reg = readl(dp->reg_base + EXYNOS_DP_COMMON_INT_STA_4);
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if (gpio_is_valid(dp->hpd_gpio)) {
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reg = gpio_get_value(dp->hpd_gpio);
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if (reg)
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return DP_IRQ_TYPE_HP_CABLE_IN;
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else
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return DP_IRQ_TYPE_HP_CABLE_OUT;
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} else {
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/* Parse hotplug interrupt status register */
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reg = readl(dp->reg_base + EXYNOS_DP_COMMON_INT_STA_4);
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if (reg & PLUG)
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return DP_IRQ_TYPE_HP_CABLE_IN;
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if (reg & PLUG)
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return DP_IRQ_TYPE_HP_CABLE_IN;
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if (reg & HPD_LOST)
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return DP_IRQ_TYPE_HP_CABLE_OUT;
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if (reg & HPD_LOST)
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return DP_IRQ_TYPE_HP_CABLE_OUT;
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if (reg & HOTPLUG_CHG)
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return DP_IRQ_TYPE_HP_CHANGE;
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if (reg & HOTPLUG_CHG)
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return DP_IRQ_TYPE_HP_CHANGE;
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return DP_IRQ_TYPE_UNKNOWN;
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return DP_IRQ_TYPE_UNKNOWN;
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}
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}
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void exynos_dp_reset_aux(struct exynos_dp_device *dp)
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@ -402,9 +417,14 @@ int exynos_dp_get_plug_in_status(struct exynos_dp_device *dp)
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{
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u32 reg;
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reg = readl(dp->reg_base + EXYNOS_DP_SYS_CTL_3);
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if (reg & HPD_STATUS)
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return 0;
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if (gpio_is_valid(dp->hpd_gpio)) {
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if (gpio_get_value(dp->hpd_gpio))
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return 0;
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} else {
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reg = readl(dp->reg_base + EXYNOS_DP_SYS_CTL_3);
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if (reg & HPD_STATUS)
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return 0;
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}
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return -EINVAL;
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}
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