From 16f4c69549ef676bc278be8b267a811b6f8f59ad Mon Sep 17 00:00:00 2001 From: Chiawen Huang Date: Wed, 5 Sep 2018 20:34:57 +0800 Subject: [PATCH] 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 Reviewed-by: Tony Cheng Acked-by: Leo Li Signed-off-by: Alex Deucher --- 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 9d8dc2c1ca65..bd58dbae7d3e 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 d43cefbc43d3..438fb35d87b8 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: -- 2.30.2