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drm/exynos: Debounce HDMI hotplug interrupts 

This patch debounces hotplug interrupts generated by the HDMI hotplug
gpio. The reason this is needed is that we get multiple (5) interrupts
every time a monitor is inserted which causes us to needlessly enable
and disable the IP block.

Signed-off-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Rahul Sharma <Rahul.Sharma@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
This commit is contained in:
Sean Paul 2014-05-09 15:05:10 +09:00 committed by Inki Dae
parent 35b95ac5c3
commit 724fd140d5
1 changed files with 21 additions and 2 deletions
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23
drivers/gpu/drm/exynos/exynos_hdmi.c
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@ -50,6 +50,8 @@
#define get_hdmi_display(dev) platform_get_drvdata(to_platform_device(dev)) #define get_hdmi_display(dev) platform_get_drvdata(to_platform_device(dev))
#define ctx_from_connector(c) container_of(c, struct hdmi_context, connector) #define ctx_from_connector(c) container_of(c, struct hdmi_context, connector)
#define HOTPLUG_DEBOUNCE_MS 1100
/* AVI header and aspect ratio */ /* AVI header and aspect ratio */
#define HDMI_AVI_VERSION 0x02 #define HDMI_AVI_VERSION 0x02
#define HDMI_AVI_LENGTH 0x0D #define HDMI_AVI_LENGTH 0x0D
@ -187,6 +189,7 @@ struct hdmi_context {
void __iomem *regs; void __iomem *regs;
int irq; int irq;
struct delayed_work hotplug_work;
struct i2c_adapter *ddc_adpt; struct i2c_adapter *ddc_adpt;
struct i2c_client *hdmiphy_port; struct i2c_client *hdmiphy_port;
@ -1857,6 +1860,8 @@ static void hdmi_poweroff(struct exynos_drm_display *display)
hdmiphy_poweroff(hdata); hdmiphy_poweroff(hdata);
cancel_delayed_work(&hdata->hotplug_work);
clk_disable_unprepare(res->sclk_hdmi); clk_disable_unprepare(res->sclk_hdmi);
clk_disable_unprepare(res->hdmi); clk_disable_unprepare(res->hdmi);
clk_disable_unprepare(res->hdmiphy); clk_disable_unprepare(res->hdmiphy);
@ -1903,9 +1908,11 @@ static struct exynos_drm_display hdmi_display = {
.ops = &hdmi_display_ops, .ops = &hdmi_display_ops,
}; };
static irqreturn_t hdmi_irq_thread(int irq, void *arg) static void hdmi_hotplug_work_func(struct work_struct *work)
{ {
struct hdmi_context *hdata = arg; struct hdmi_context *hdata;
hdata = container_of(work, struct hdmi_context, hotplug_work.work);
mutex_lock(&hdata->hdmi_mutex); mutex_lock(&hdata->hdmi_mutex);
hdata->hpd = gpio_get_value(hdata->hpd_gpio); hdata->hpd = gpio_get_value(hdata->hpd_gpio);
@ -1913,6 +1920,14 @@ static irqreturn_t hdmi_irq_thread(int irq, void *arg)
if (hdata->drm_dev) if (hdata->drm_dev)
drm_helper_hpd_irq_event(hdata->drm_dev); drm_helper_hpd_irq_event(hdata->drm_dev);
}
static irqreturn_t hdmi_irq_thread(int irq, void *arg)
{
struct hdmi_context *hdata = arg;
mod_delayed_work(system_wq, &hdata->hotplug_work,
msecs_to_jiffies(HOTPLUG_DEBOUNCE_MS));
return IRQ_HANDLED; return IRQ_HANDLED;
} }
@ -2142,6 +2157,8 @@ static int hdmi_probe(struct platform_device *pdev)
hdata->hpd = gpio_get_value(hdata->hpd_gpio); hdata->hpd = gpio_get_value(hdata->hpd_gpio);
INIT_DELAYED_WORK(&hdata->hotplug_work, hdmi_hotplug_work_func);
ret = devm_request_threaded_irq(dev, hdata->irq, NULL, ret = devm_request_threaded_irq(dev, hdata->irq, NULL,
hdmi_irq_thread, IRQF_TRIGGER_RISING | hdmi_irq_thread, IRQF_TRIGGER_RISING |
IRQF_TRIGGER_FALLING | IRQF_ONESHOT, IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
@ -2167,6 +2184,8 @@ static int hdmi_remove(struct platform_device *pdev)
{ {
struct hdmi_context *hdata = hdmi_display.ctx; struct hdmi_context *hdata = hdmi_display.ctx;
cancel_delayed_work_sync(&hdata->hotplug_work);
put_device(&hdata->hdmiphy_port->dev); put_device(&hdata->hdmiphy_port->dev);
put_device(&hdata->ddc_adpt->dev); put_device(&hdata->ddc_adpt->dev);