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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>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Chiawen Huang 2018-09-05 20:34:57 +08:00 committed by Alex Deucher
parent cac7643a27
commit 16f4c69549
2 changed files with 19 additions and 0 deletions
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18
drivers/gpu/drm/amd/display/dc/core/dc_link.c
View File

@ -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)
{

1
drivers/gpu/drm/amd/display/dc/dc_link.h
View File

@ -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: