drm/amd/display: add gpio lock/unlock

[Why]
When querying HPD via GPIO flow,
it will create a new gpio object then free in the end of query.
There is a irql issue for HPD querying at ISR level.

[How]
Therefore, creating the HPD gpio object in dc_link and set it as unlcok in default.
1. reducing unnecessary malloc/free when HPD querying.
2. reducing init GPIO flow.
3. add lock/unlock to prevent multi gpio service running.

Signed-off-by: Chiawen Huang <chiawen.huang@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/display/include/gpio_interface.h b/drivers/gpu/drm/amd/display/include/gpio_interface.h
index e4fd31024b92..7de64195dc33 100644
--- a/drivers/gpu/drm/amd/display/include/gpio_interface.h
+++ b/drivers/gpu/drm/amd/display/include/gpio_interface.h
@@ -59,6 +59,14 @@ enum gpio_result dal_gpio_change_mode(
 	struct gpio *gpio,
 	enum gpio_mode mode);
 
+/* Lock Pin */
+enum gpio_result dal_gpio_lock_pin(
+	struct gpio *gpio);
+
+/* Unlock Pin */
+enum gpio_result dal_gpio_unlock_pin(
+	struct gpio *gpio);
+
 /* Get the GPIO id */
 enum gpio_id dal_gpio_get_id(
 	const struct gpio *gpio);