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From 7146434404a337891cdb41acb0ba91bb42eaab51 Mon Sep 17 00:00:00 2001
From: Chiawen Huang <chiawen.huang@amd.com>
Date: Wed, 5 Sep 2018 20:34:57 +0800
Subject: [PATCH 0279/2940] drm/amd/display: add query HPD interface.
[Why]
current dc_link_detect function is not only detection but also update some link data.
[How]
added a pure get HPD state function.
Signed-off-by: Chiawen Huang <chiawen.huang@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
---
drivers/gpu/drm/amd/display/dc/core/dc_link.c | 18 ++++++++++++++++++
drivers/gpu/drm/amd/display/dc/dc_link.h | 1 +
2 files changed, 19 insertions(+)
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
index 14c00c704a45..54d8c0afca59 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
@@ -890,6 +890,24 @@ bool dc_link_detect(struct dc_link *link, enum dc_detect_reason reason)
return true;
}
+bool dc_link_get_hpd_state(struct dc_link *dc_link)
+{
+ struct gpio *hpd_pin;
+ uint32_t state;
+
+ hpd_pin = get_hpd_gpio(dc_link->ctx->dc_bios,
+ dc_link->link_id, dc_link->ctx->gpio_service);
+ if (hpd_pin == NULL)
+ ASSERT(false);
+
+ dal_gpio_open(hpd_pin, GPIO_MODE_INTERRUPT);
+ dal_gpio_get_value(hpd_pin, &state);
+ dal_gpio_close(hpd_pin);
+ dal_gpio_destroy_irq(&hpd_pin);
+
+ return state;
+}
+
static enum hpd_source_id get_hpd_line(
struct dc_link *link)
{
diff --git a/drivers/gpu/drm/amd/display/dc/dc_link.h b/drivers/gpu/drm/amd/display/dc/dc_link.h
index 1b48ab9aea89..3bfdccceb524 100644
--- a/drivers/gpu/drm/amd/display/dc/dc_link.h
+++ b/drivers/gpu/drm/amd/display/dc/dc_link.h
@@ -167,6 +167,7 @@ enum dc_detect_reason {
};
bool dc_link_detect(struct dc_link *dc_link, enum dc_detect_reason reason);
+bool dc_link_get_hpd_state(struct dc_link *dc_link);
/* Notify DC about DP RX Interrupt (aka Short Pulse Interrupt).
* Return:
--
2.17.1
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