From ac627caf6b9275a3df4730be3b8637c3bc232979 Mon Sep 17 00:00:00 2001 From: Chiawen Huang Date: Fri, 18 Jan 2019 14:07:54 +0800 Subject: 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 Reviewed-by: Tony Cheng Acked-by: Bhawanpreet Lakha Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/display/include/gpio_interface.h | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'drivers/gpu/drm/amd/display/include/gpio_interface.h') 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); -- cgit v1.2.3-70-g09d2