From: Sean Paul <seanpaul@chromium.org>
To: linux-fbdev@vger.kernel.org
Subject: [PATCH 10/10] video: exynos_dp: Enable hotplug interrupts
Date: Wed, 08 Aug 2012 03:54:24 +0000 [thread overview]
Message-ID: <1344398064-13563-11-git-send-email-seanpaul@chromium.org> (raw)
Enable hotplug interrupts and move the hotplug scheduling into the
interrupt handler. This allows us to introduce a screen at any time
while we're running.
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Reviewed-by: Olof Johansson <olofj@chromium.org>
---
drivers/video/exynos/exynos_dp_core.c | 40 +++++++++++++++++++++++++-------
drivers/video/exynos/exynos_dp_core.h | 9 +++++++
drivers/video/exynos/exynos_dp_reg.c | 35 ++++++++++++++++++++++++++++-
3 files changed, 74 insertions(+), 10 deletions(-)
diff --git a/drivers/video/exynos/exynos_dp_core.c b/drivers/video/exynos/exynos_dp_core.c
index eb5816f..5279027 100644
--- a/drivers/video/exynos/exynos_dp_core.c
+++ b/drivers/video/exynos/exynos_dp_core.c
@@ -47,10 +47,6 @@ static int exynos_dp_detect_hpd(struct exynos_dp_device *dp)
{
int timeout_loop = 0;
- exynos_dp_init_hpd(dp);
-
- usleep_range(200, 210);
-
while (exynos_dp_get_plug_in_status(dp) != 0) {
timeout_loop++;
if (DP_TIMEOUT_LOOP_COUNT < timeout_loop) {
@@ -829,8 +825,32 @@ static void exynos_dp_enable_scramble(struct exynos_dp_device *dp, bool enable)
static irqreturn_t exynos_dp_irq_handler(int irq, void *arg)
{
struct exynos_dp_device *dp = arg;
-
- dev_err(dp->dev, "exynos_dp_irq_handler\n");
+ enum dp_irq_type irq_type;
+
+ irq_type = exynos_dp_get_irq_type(dp);
+ switch (irq_type) {
+ case DP_IRQ_TYPE_HP_CABLE_IN:
+ dev_dbg(dp->dev, "Received irq - cable in\n");
+ schedule_work(&dp->hotplug_work);
+ exynos_dp_clear_hotplug_interrupts(dp);
+ break;
+ case DP_IRQ_TYPE_HP_CABLE_OUT:
+ dev_dbg(dp->dev, "Received irq - cable out\n");
+ exynos_dp_clear_hotplug_interrupts(dp);
+ break;
+ case DP_IRQ_TYPE_HP_CHANGE:
+ /*
+ * We get these change notifications once in a while, but there
+ * is nothing we can do with them. Just ignore it for now and
+ * only handle cable changes.
+ */
+ dev_dbg(dp->dev, "Received irq - hotplug change; ignoring.\n");
+ exynos_dp_clear_hotplug_interrupts(dp);
+ break;
+ default:
+ dev_err(dp->dev, "Received irq - unknown type!\n");
+ break;
+ }
return IRQ_HANDLED;
}
@@ -843,7 +863,7 @@ static void exynos_dp_hotplug(struct work_struct *work)
ret = exynos_dp_detect_hpd(dp);
if (ret) {
- dev_err(dp->dev, "unable to detect hpd\n");
+ /* Cable has been disconnected, we're done */
return;
}
@@ -941,7 +961,6 @@ static int __devinit exynos_dp_probe(struct platform_device *pdev)
exynos_dp_init_dp(dp);
platform_set_drvdata(pdev, dp);
- schedule_work(&dp->hotplug_work);
return 0;
@@ -975,6 +994,8 @@ static int exynos_dp_suspend(struct device *dev)
struct exynos_dp_platdata *pdata = pdev->dev.platform_data;
struct exynos_dp_device *dp = platform_get_drvdata(pdev);
+ disable_irq(dp->irq);
+
if (work_pending(&dp->hotplug_work))
flush_work_sync(&dp->hotplug_work);
@@ -998,7 +1019,8 @@ static int exynos_dp_resume(struct device *dev)
clk_enable(dp->clock);
exynos_dp_init_dp(dp);
- schedule_work(&dp->hotplug_work);
+
+ enable_irq(dp->irq);
return 0;
}
diff --git a/drivers/video/exynos/exynos_dp_core.h b/drivers/video/exynos/exynos_dp_core.h
index cf1010b..a5795dd 100644
--- a/drivers/video/exynos/exynos_dp_core.h
+++ b/drivers/video/exynos/exynos_dp_core.h
@@ -13,6 +13,13 @@
#ifndef _EXYNOS_DP_CORE_H
#define _EXYNOS_DP_CORE_H
+enum dp_irq_type {
+ DP_IRQ_TYPE_HP_CABLE_IN,
+ DP_IRQ_TYPE_HP_CABLE_OUT,
+ DP_IRQ_TYPE_HP_CHANGE,
+ DP_IRQ_TYPE_UNKNOWN,
+};
+
struct link_train {
int eq_loop;
int cr_loop[4];
@@ -51,6 +58,8 @@ void exynos_dp_set_analog_power_down(struct exynos_dp_device *dp,
bool enable);
void exynos_dp_init_analog_func(struct exynos_dp_device *dp);
void exynos_dp_init_hpd(struct exynos_dp_device *dp);
+enum dp_irq_type exynos_dp_get_irq_type(struct exynos_dp_device *dp);
+void exynos_dp_clear_hotplug_interrupts(struct exynos_dp_device *dp);
void exynos_dp_reset_aux(struct exynos_dp_device *dp);
void exynos_dp_init_aux(struct exynos_dp_device *dp);
int exynos_dp_get_plug_in_status(struct exynos_dp_device *dp);
diff --git a/drivers/video/exynos/exynos_dp_reg.c b/drivers/video/exynos/exynos_dp_reg.c
index 389e0f0..5906fc7 100644
--- a/drivers/video/exynos/exynos_dp_reg.c
+++ b/drivers/video/exynos/exynos_dp_reg.c
@@ -327,7 +327,7 @@ void exynos_dp_init_analog_func(struct exynos_dp_device *dp)
writel(reg, dp->reg_base + EXYNOS_DP_FUNC_EN_2);
}
-void exynos_dp_init_hpd(struct exynos_dp_device *dp)
+void exynos_dp_clear_hotplug_interrupts(struct exynos_dp_device *dp)
{
u32 reg;
@@ -336,10 +336,43 @@ void exynos_dp_init_hpd(struct exynos_dp_device *dp)
reg = INT_HPD;
writel(reg, dp->reg_base + EXYNOS_DP_INT_STA);
+}
+
+void exynos_dp_init_hpd(struct exynos_dp_device *dp)
+{
+ u32 reg;
+
+ exynos_dp_clear_hotplug_interrupts(dp);
reg = readl(dp->reg_base + EXYNOS_DP_SYS_CTL_3);
reg &= ~(F_HPD | HPD_CTRL);
writel(reg, dp->reg_base + EXYNOS_DP_SYS_CTL_3);
+
+ /* Unmask hotplug interrupts */
+ reg = HOTPLUG_CHG | HPD_LOST | PLUG;
+ writel(reg, dp->reg_base + EXYNOS_DP_COMMON_INT_MASK_4);
+
+ reg = INT_HPD;
+ writel(reg, dp->reg_base + EXYNOS_DP_INT_STA_MASK);
+}
+
+enum dp_irq_type exynos_dp_get_irq_type(struct exynos_dp_device *dp)
+{
+ u32 reg;
+
+ /* Parse hotplug interrupt status register */
+ reg = readl(dp->reg_base + EXYNOS_DP_COMMON_INT_STA_4);
+
+ if (reg & PLUG)
+ return DP_IRQ_TYPE_HP_CABLE_IN;
+
+ if (reg & HPD_LOST)
+ return DP_IRQ_TYPE_HP_CABLE_OUT;
+
+ if (reg & HOTPLUG_CHG)
+ return DP_IRQ_TYPE_HP_CHANGE;
+
+ return DP_IRQ_TYPE_UNKNOWN;
}
void exynos_dp_reset_aux(struct exynos_dp_device *dp)
--
1.7.7.3
next reply other threads:[~2012-08-08 3:54 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-08 3:54 Sean Paul [this message]
2012-08-20 9:29 ` [PATCH 10/10] video: exynos_dp: Enable hotplug interrupts Jingoo Han
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