[PATCH 16/43] drm/amd/display: stop doing unnecessary detection when going to D3

[Rodrigo Siqueira]

From: Joseph Gravenor <joseph.gravenor at amd.com>

[Why]
Don't want to start HW discovery unless we have lost power,
as doing rediscovery otherwise is both unnecessary and time consuming.
Before this change it takes 40 seconds to go in to suspend, after it
takes 27 seconds

[How]
Accelerated mode gets cleared if we lose power. Only do detection if
this register is cleared

Signed-off-by: Joseph Gravenor <joseph.gravenor at amd.com>
Reviewed-by: Eric Yang <eric.yang2 at amd.com>
Acked-by: Harry Wentland <harry.wentland at amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira at amd.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc.c | 6 ++++++
 drivers/gpu/drm/amd/display/dc/dc.h      | 1 +
 2 files changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index 46f2b54c3526..c918a0cd8c60 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -1318,6 +1318,12 @@ bool dc_commit_state(struct dc *dc, struct dc_state *context)
 	return (result == DC_OK);
 }
 
+bool dc_is_hw_initialized(struct dc *dc)
+{
+	struct dc_bios *dcb = dc->ctx->dc_bios;
+	return dcb->funcs->is_accelerated_mode(dcb);
+}
+
 bool dc_post_update_surfaces_to_stream(struct dc *dc)
 {
 	int i;
diff --git a/drivers/gpu/drm/amd/display/dc/dc.h b/drivers/gpu/drm/amd/display/dc/dc.h
index 29762b0531fc..d1d57432bc7e 100644
--- a/drivers/gpu/drm/amd/display/dc/dc.h
+++ b/drivers/gpu/drm/amd/display/dc/dc.h
@@ -1069,6 +1069,7 @@ unsigned int dc_get_current_backlight_pwm(struct dc *dc);
 unsigned int dc_get_target_backlight_pwm(struct dc *dc);
 
 bool dc_is_dmcu_initialized(struct dc *dc);
+bool dc_is_hw_initialized(struct dc *dc);
 
 enum dc_status dc_set_clock(struct dc *dc, enum dc_clock_type clock_type, uint32_t clk_khz, uint32_t stepping);
 void dc_get_clock(struct dc *dc, enum dc_clock_type clock_type, struct dc_clock_config *clock_cfg);
-- 
2.24.1