diff options
| author | Thierry Reding <treding@nvidia.com> | 2014-04-25 16:42:32 +0200 |
|---|---|---|
| committer | Thierry Reding <treding@nvidia.com> | 2014-06-05 23:14:48 +0200 |
| commit | 2fff79d38bbed2266232d2526a19d42cde476ea7 (patch) | |
| tree | e2368f12049ded09d249be2b94e48a988112375c /drivers/gpu/drm/tegra | |
| parent | e687651bc1ed96b0ad2ee9464f341c53563b5353 (diff) | |
drm/tegra: dp - Implement hotplug detection in work queue
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>
Diffstat (limited to 'drivers/gpu/drm/tegra')
| -rw-r--r-- | drivers/gpu/drm/tegra/dpaux.c | 30 |
1 files changed, 20 insertions, 10 deletions
diff --git a/drivers/gpu/drm/tegra/dpaux.c b/drivers/gpu/drm/tegra/dpaux.c index 2b725ba7facc..208fc1bef7c5 100644 --- a/drivers/gpu/drm/tegra/dpaux.c +++ b/drivers/gpu/drm/tegra/dpaux.c @@ -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); |