drm/amd/display: Fix 4to1 MPC black screen with DPP RCO

[Why]
DPP Root clock optimization when combined with 4to1 MPC combine results
in the screen turning black.

This is because the DPPCLK is stopped during the middle of an
optimize_bandwidth sequence during commit_minimal_transition without
going through plane power down/power up.

[How]
The intent of a 0Hz DPP clock through update_clocks is to disable the
DTO. This differs from the behavior of stopping the DPPCLK entirely
(utilizing a 0Hz clock on some ASIC) so it's better to move this logic
to reside next to plane power up/power down where we gate the HUBP/DPP
DOMAIN.

The new  sequence should be:
Power down: PG enabled -> RCO on
Power up: RCO off -> PG disabled

Rename power_on_plane to power_on_plane_resources to reflect the
actual operation that's occurring.

Cc: stable@vger.kernel.org
Cc: Mario Limonciello <mario.limonciello@amd.com>
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 14 insertions, 11 deletions

diff --git a/drivers/gpu/drm/amd/display/dc/inc/hw/dccg.h b/drivers/gpu/drm/amd/display/dc/inc/hw/dccg.h
index ce006762f257..ad6acd1b34e1 100644
--- a/drivers/gpu/drm/amd/display/dc/inc/hw/dccg.h
+++ b/drivers/gpu/drm/amd/display/dc/inc/hw/dccg.h
@@ -148,18 +148,21 @@ struct dccg_funcs {
 		struct dccg *dccg,
 		int inst);
 
-void (*set_pixel_rate_div)(
-        struct dccg *dccg,
-        uint32_t otg_inst,
-        enum pixel_rate_div k1,
-        enum pixel_rate_div k2);
-
-void (*set_valid_pixel_rate)(
-        struct dccg *dccg,
-	int ref_dtbclk_khz,
-        int otg_inst,
-        int pixclk_khz);
+	void (*set_pixel_rate_div)(struct dccg *dccg,
+			uint32_t otg_inst,
+			enum pixel_rate_div k1,
+			enum pixel_rate_div k2);
 
+	void (*set_valid_pixel_rate)(
+			struct dccg *dccg,
+			int ref_dtbclk_khz,
+			int otg_inst,
+			int pixclk_khz);
+
+	void (*dpp_root_clock_control)(
+			struct dccg *dccg,
+			unsigned int dpp_inst,
+			bool clock_on);
 };
 
 #endif //__DAL_DCCG_H__