renegade-project/linux-next
2
0
Fork 0
mirror of https://github.com/edk2-porting/linux-next.git synced 2025-01-01 18:24:23 +08:00
Code

drm/exynos: Debounce HDMI hotplug interrupts

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
drivers/gpu/drm/exynos/exynos_hdmi.c
View File

@ -50,6 +50,8 @@
#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 HOTPLUG_DEBOUNCE_MS 1100
/* AVI header and aspect ratio */
#define HDMI_AVI_VERSION 0x02
#define HDMI_AVI_LENGTH 0x0D
@ -187,6 +189,7 @@ struct hdmi_context {
void __iomem *regs;
int irq;
struct delayed_work hotplug_work;
struct i2c_adapter *ddc_adpt;
struct i2c_client *hdmiphy_port;
@ -1857,6 +1860,8 @@ static void hdmi_poweroff(struct exynos_drm_display *display)
hdmiphy_poweroff(hdata);
cancel_delayed_work(&hdata->hotplug_work);
clk_disable_unprepare(res->sclk_hdmi);
clk_disable_unprepare(res->hdmi);
clk_disable_unprepare(res->hdmiphy);
@ -1903,9 +1908,11 @@ static struct exynos_drm_display hdmi_display = {
.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);
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)
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;
}
@ -2142,6 +2157,8 @@ static int hdmi_probe(struct platform_device *pdev)
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,
hdmi_irq_thread, IRQF_TRIGGER_RISING |
IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
@ -2167,6 +2184,8 @@ static int hdmi_remove(struct platform_device *pdev)
{
struct hdmi_context *hdata = hdmi_display.ctx;
cancel_delayed_work_sync(&hdata->hotplug_work);
put_device(&hdata->hdmiphy_port->dev);
put_device(&hdata->ddc_adpt->dev);