Commit 16f4c695 authored by Chiawen Huang's avatar Chiawen Huang Committed by Alex Deucher
Browse files

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: default avatarChiawen Huang <chiawen.huang@amd.com>
Reviewed-by: default avatarTony Cheng <Tony.Cheng@amd.com>
Acked-by: default avatarLeo Li <sunpeng.li@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent cac7643a

drivers/gpu/drm/amd/display/dc/core/dc_link.c

+18 −0
Original line number Diff line number Diff line
@@ -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)

{

drivers/gpu/drm/amd/display/dc/dc_link.h

+1 −0
Original line number Diff line number Diff line
@@ -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:

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