drm/amd/display: Defer LUT memory powerdown until LUT bypass latches

[WHY]
Blnd, 3dlut, and shaper LUT select registers are double buffered, however
their accompanying LUT memory shutdown registers are not. As a result,
shutting down LUT memory immediately after setting a block to bypass causes
corruption as bypass only happens at next Vupdate.

[HOW]
Re-enable mem low power for CM block
Force optimization on next flip and disable LUT memory during optimization
sequence if LUT select field is then set to bypass

v2: squash in CONFIG_DRM_AMD_DC_DCN fix (Alex)

Reviewed-by: Eric Yang <[email protected]>
Acked-by: Anson Jacob <[email protected]>
Signed-off-by: Michael Strauss <[email protected]>
Tested-by: Daniel Wheeler <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/display/dc/inc/hw/dpp.h b/drivers/gpu/drm/amd/display/dc/inc/hw/dpp.h
index 00fc81431b43..9f12792b7e59 100644
--- a/drivers/gpu/drm/amd/display/dc/inc/hw/dpp.h
+++ b/drivers/gpu/drm/amd/display/dc/inc/hw/dpp.h
@@ -29,6 +29,15 @@
 
 #include "transform.h"
 
+union defer_reg_writes {
+	struct {
+		bool disable_blnd_lut:1;
+		bool disable_3dlut:1;
+		bool disable_shaper:1;
+	} bits;
+	uint32_t raw;
+};
+
 struct dpp {
 	const struct dpp_funcs *funcs;
 	struct dc_context *ctx;
@@ -43,6 +52,7 @@ struct dpp {
 	struct pwl_params regamma_params;
 	struct pwl_params degamma_params;
 	struct dpp_cursor_attributes cur_attr;
+	union defer_reg_writes deferred_reg_writes;
 
 	struct pwl_params shaper_params;
 	bool cm_bypass_mode;
@@ -245,6 +255,8 @@ struct dpp_funcs {
 			bool dppclk_div,
 			bool enable);
 
+	void (*dpp_deferred_update)(
+			struct dpp *dpp);
 	bool (*dpp_program_blnd_lut)(
 			struct dpp *dpp,
 			const struct pwl_params *params);