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drm/tegra: dp - Implement hotplug detection in work queue

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Calling the drm_helper_hpd_irq_event() helper can sleep, so instead of
invoking it directly from the interrupt handler, schedule a work queue
and run it from there.

Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Thierry Reding 2014-04-25 16:42:32 +02:00
parent e687651bc1
commit 2fff79d38b
1 changed files with 20 additions and 10 deletions
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30
drivers/gpu/drm/tegra/dpaux.c
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@ -15,6 +15,7 @@
#include <linux/platform_device.h>
#include <linux/reset.h>
#include <linux/regulator/consumer.h>
#include <linux/workqueue.h>
#include <drm/drm_dp_helper.h>
#include <drm/drm_panel.h>
@ -41,6 +42,7 @@ struct tegra_dpaux {
struct regulator *vdd;
struct completion complete;
struct work_struct work;
struct list_head list;
};
@ -49,6 +51,11 @@ static inline struct tegra_dpaux *to_dpaux(struct drm_dp_aux *aux)
return container_of(aux, struct tegra_dpaux, aux);
}
static inline struct tegra_dpaux *work_to_dpaux(struct work_struct *work)
{
return container_of(work, struct tegra_dpaux, work);
}
static inline unsigned long tegra_dpaux_readl(struct tegra_dpaux *dpaux,
unsigned long offset)
{
@ -231,6 +238,14 @@ static ssize_t tegra_dpaux_transfer(struct drm_dp_aux *aux,
return ret;
}
static void tegra_dpaux_hotplug(struct work_struct *work)
{
struct tegra_dpaux *dpaux = work_to_dpaux(work);
if (dpaux->output)
drm_helper_hpd_irq_event(dpaux->output->connector.dev);
}
static irqreturn_t tegra_dpaux_irq(int irq, void *data)
{
struct tegra_dpaux *dpaux = data;
@ -241,16 +256,8 @@ static irqreturn_t tegra_dpaux_irq(int irq, void *data)
value = tegra_dpaux_readl(dpaux, DPAUX_INTR_AUX);
tegra_dpaux_writel(dpaux, value, DPAUX_INTR_AUX);
if (value & DPAUX_INTR_PLUG_EVENT) {
if (dpaux->output) {
drm_helper_hpd_irq_event(dpaux->output->connector.dev);
}
}
if (value & DPAUX_INTR_UNPLUG_EVENT) {
if (dpaux->output)
drm_helper_hpd_irq_event(dpaux->output->connector.dev);
}
if (value & (DPAUX_INTR_PLUG_EVENT | DPAUX_INTR_UNPLUG_EVENT))
schedule_work(&dpaux->work);
if (value & DPAUX_INTR_IRQ_EVENT) {
/* TODO: handle this */
@ -273,6 +280,7 @@ static int tegra_dpaux_probe(struct platform_device *pdev)
if (!dpaux)
return -ENOMEM;
INIT_WORK(&dpaux->work, tegra_dpaux_hotplug);
init_completion(&dpaux->complete);
INIT_LIST_HEAD(&dpaux->list);
dpaux->dev = &pdev->dev;
@ -361,6 +369,8 @@ static int tegra_dpaux_remove(struct platform_device *pdev)
list_del(&dpaux->list);
mutex_unlock(&dpaux_lock);
cancel_work_sync(&dpaux->work);
clk_disable_unprepare(dpaux->clk_parent);
reset_control_assert(dpaux->rst);
clk_disable_unprepare(dpaux->clk);