[PATCH v12.1 13/17] drm: bridge: analogix/dp: try force hpd after plug in lookup failed
From: Yakir Yang
Date: Tue Jan 19 2016 - 05:09:11 EST
Some edp screen do not have hpd signal, so we can't just return
failed when hpd plug in detect failed.
This is an hardware property, so we need add a devicetree property
"analogix,need-force-hpd" to indicate this sutiation.
Signed-off-by: Yakir Yang <ykk@xxxxxxxxxxxxxx>
Acked-by: Rob Herring <robh@xxxxxxxxxx>
Tested-by: Javier Martinez Canillas <javier@xxxxxxxxxxxxxxx>
---
There is no new changes in v12.1, but just rebase the whole patches on
top of Dave's drm-next branch [0] (Heiko)
Changes in v12.1: None
Changes in v12: None
Changes in v11:
- Rename the "analogix,need-force-hpd" to common 'force-hpd' (Rob)
- Add the ack from Rob Herring
Changes in v10: None
Changes in v9: None
Changes in v8: None
Changes in v7: None
Changes in v6: None
Changes in v5: None
Changes in v4: None
Changes in v3:
- Add "analogix,need-force-hpd" to indicate whether driver need foce
hpd when hpd detect failed.
Changes in v2: None
.../bindings/display/bridge/analogix_dp.txt | 4 ++-
.../bindings/display/exynos/exynos_dp.txt | 1 +
.../display/rockchip/analogix_dp-rockchip.txt | 1 +
drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 35 ++++++++++++++++++----
drivers/gpu/drm/bridge/analogix/analogix_dp_core.h | 2 ++
drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c | 9 ++++++
6 files changed, 46 insertions(+), 6 deletions(-)
diff --git a/Documentation/devicetree/bindings/display/bridge/analogix_dp.txt b/Documentation/devicetree/bindings/display/bridge/analogix_dp.txt
index 7659a7a..4f2ba8c 100644
--- a/Documentation/devicetree/bindings/display/bridge/analogix_dp.txt
+++ b/Documentation/devicetree/bindings/display/bridge/analogix_dp.txt
@@ -22,6 +22,9 @@ Required properties for dp-controller:
from general PHY binding: Should be "dp".
Optional properties for dp-controller:
+ -force-hpd:
+ Indicate driver need force hpd when hpd detect failed, this
+ is used for some eDP screen which don't have hpd signal.
-hpd-gpios:
Hotplug detect GPIO.
Indicates which GPIO should be used for hotplug detection
@@ -31,7 +34,6 @@ Optional properties for dp-controller:
* Documentation/devicetree/bindings/display/exynos/exynos_dp.txt
* Documentation/devicetree/bindings/video/analogix_dp-rockchip.txt
-
[1]: Documentation/devicetree/bindings/media/video-interfaces.txt
-------------------------------------------------------------------------------
diff --git a/Documentation/devicetree/bindings/display/exynos/exynos_dp.txt b/Documentation/devicetree/bindings/display/exynos/exynos_dp.txt
index 4fa8aca..ade5d8e 100644
--- a/Documentation/devicetree/bindings/display/exynos/exynos_dp.txt
+++ b/Documentation/devicetree/bindings/display/exynos/exynos_dp.txt
@@ -56,6 +56,7 @@ For the below properties, please refer to Analogix DP binding document:
-phys (required)
-phy-names (required)
-hpd-gpios (optional)
+ force-hpd (optional)
Deprecated properties for DisplayPort:
-interlaced: deprecated prop that can parsed from drm_display_mode.
diff --git a/Documentation/devicetree/bindings/display/rockchip/analogix_dp-rockchip.txt b/Documentation/devicetree/bindings/display/rockchip/analogix_dp-rockchip.txt
index 04d99e3..e832ff9 100644
--- a/Documentation/devicetree/bindings/display/rockchip/analogix_dp-rockchip.txt
+++ b/Documentation/devicetree/bindings/display/rockchip/analogix_dp-rockchip.txt
@@ -32,6 +32,7 @@ For the below properties, please refer to Analogix DP binding document:
- phys (required)
- phy-names (required)
- hpd-gpios (optional)
+- force-hpd (optional)
-------------------------------------------------------------------------------
Example:
diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index a62e8d0..13986b7 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
@@ -62,15 +62,38 @@ static int analogix_dp_detect_hpd(struct analogix_dp_device *dp)
{
int timeout_loop = 0;
- while (analogix_dp_get_plug_in_status(dp) != 0) {
+ while (timeout_loop < DP_TIMEOUT_LOOP_COUNT) {
+ if (analogix_dp_get_plug_in_status(dp) == 0)
+ return 0;
+
timeout_loop++;
- if (timeout_loop > DP_TIMEOUT_LOOP_COUNT) {
- dev_err(dp->dev, "failed to get hpd plug status\n");
- return -ETIMEDOUT;
- }
usleep_range(10, 11);
}
+ /*
+ * Some edp screen do not have hpd signal, so we can't just
+ * return failed when hpd plug in detect failed, DT property
+ * "force-hpd" would indicate whether driver need this.
+ */
+ if (!dp->force_hpd)
+ return -ETIMEDOUT;
+
+ /*
+ * The eDP TRM indicate that if HPD_STATUS(RO) is 0, AUX CH
+ * will not work, so we need to give a force hpd action to
+ * set HPD_STATUS manually.
+ */
+ dev_dbg(dp->dev, "failed to get hpd plug status, try to force hpd\n");
+
+ analogix_dp_force_hpd(dp);
+
+ if (analogix_dp_get_plug_in_status(dp) != 0) {
+ dev_err(dp->dev, "failed to get hpd plug in status\n");
+ return -EINVAL;
+ }
+
+ dev_dbg(dp->dev, "success to get plug in status after force hpd\n");
+
return 0;
}
@@ -1291,6 +1314,8 @@ int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
if (IS_ERR(dp->reg_base))
return PTR_ERR(dp->reg_base);
+ dp->force_hpd = of_property_read_bool(dev->of_node, "force-hpd");
+
dp->hpd_gpio = of_get_named_gpio(dev->of_node, "hpd-gpios", 0);
if (!gpio_is_valid(dp->hpd_gpio))
dp->hpd_gpio = of_get_named_gpio(dev->of_node,
diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
index 6cc53d4..a8cba64 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
@@ -154,6 +154,7 @@ struct analogix_dp_device {
struct phy *phy;
int dpms_mode;
int hpd_gpio;
+ bool force_hpd;
struct analogix_dp_plat_data *plat_data;
};
@@ -174,6 +175,7 @@ void analogix_dp_set_analog_power_down(struct analogix_dp_device *dp,
bool enable);
void analogix_dp_init_analog_func(struct analogix_dp_device *dp);
void analogix_dp_init_hpd(struct analogix_dp_device *dp);
+void analogix_dp_force_hpd(struct analogix_dp_device *dp);
enum dp_irq_type analogix_dp_get_irq_type(struct analogix_dp_device *dp);
void analogix_dp_clear_hotplug_interrupts(struct analogix_dp_device *dp);
void analogix_dp_reset_aux(struct analogix_dp_device *dp);
diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
index 1e24b37..cba3ffd 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
@@ -365,6 +365,15 @@ void analogix_dp_init_hpd(struct analogix_dp_device *dp)
writel(reg, dp->reg_base + ANALOGIX_DP_SYS_CTL_3);
}
+void analogix_dp_force_hpd(struct analogix_dp_device *dp)
+{
+ u32 reg;
+
+ reg = readl(dp->reg_base + ANALOGIX_DP_SYS_CTL_3);
+ reg = (F_HPD | HPD_CTRL);
+ writel(reg, dp->reg_base + ANALOGIX_DP_SYS_CTL_3);
+}
+
enum dp_irq_type analogix_dp_get_irq_type(struct analogix_dp_device *dp)
{
u32 reg;
--
1.9.1