drm/amd/display: Add in/out transfer functions to DC

Refactor part 1 of degamma/regamma programming.

End goal is to have source and output transfer function in
which dc can use to decide how to program the degamma
and regamma HW.

Gamma will be explicitly applied through
dc_update_surfaces_for_target.

Color module should build the logical curve with all
adjustments applied and pass enough information
for dc to program HW PWL.

Signed-off-by: Anthony Koo <anthony.koo@amd.com>
Reviewed-by: Aric Cyr <Aric.Cyr@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/core/dc.c

@@ -1455,6 +1455,34 @@ void dc_update_surfaces_for_target(struct dc *dc, struct dc_surface_update *upda
 				surface->public.gamma_correction =
 							updates[i].gamma;
 			}
+
+			if (updates[i].in_transfer_func &&
+					updates[i].in_transfer_func !=
+					surface->public.in_transfer_func) {
+				if (surface->public.in_transfer_func != NULL)
+					dc_transfer_func_release(
+							surface->public.
+							in_transfer_func);
+
+				dc_transfer_func_retain(
+						updates[i].in_transfer_func);
+				surface->public.in_transfer_func =
+						updates[i].in_transfer_func;
+			}
+
+			if (updates[i].out_transfer_func &&
+					updates[i].out_transfer_func !=
+					surface->public.out_transfer_func) {
+				if (surface->public.out_transfer_func != NULL)
+					dc_transfer_func_release(
+							surface->public.
+							out_transfer_func);
+
+				dc_transfer_func_retain(
+						updates[i].out_transfer_func);
+				surface->public.out_transfer_func =
+						updates[i].out_transfer_func;
+			}
 		}
 	}
 
@@ -1474,7 +1502,6 @@ void dc_update_surfaces_for_target(struct dc *dc, struct dc_surface_update *upda
 
 			if (updates[i].plane_info || updates[i].scaling_info
 					|| is_new_pipe_surface[j]) {
-
 				apply_ctx = true;
 
 				if (!pipe_ctx->tg->funcs->is_blanked(pipe_ctx->tg)) {
@@ -1489,9 +1516,12 @@ void dc_update_surfaces_for_target(struct dc *dc, struct dc_surface_update *upda
 				}
 			}
 
-			if (updates[i].gamma)
-				core_dc->hwss.prepare_pipe_for_context(
-						core_dc, pipe_ctx, context);
+			if (is_new_pipe_surface[j] ||
+					updates[i].gamma ||
+					updates[i].in_transfer_func ||
+					updates[i].out_transfer_func)
+				core_dc->hwss.set_gamma_correction(
+						pipe_ctx, pipe_ctx->surface);
 		}
 		if (apply_ctx) {
 			core_dc->hwss.apply_ctx_for_surface(core_dc, surface, context);

drivers/gpu/drm/amd/display/dc/core/dc_surface.c

@@ -45,11 +45,18 @@ struct gamma {
 	int ref_count;
 };
 
+struct transfer_func {
+	struct core_transfer_func protected;
+	int ref_count;
+};
+
 #define DC_SURFACE_TO_SURFACE(dc_surface) container_of(dc_surface, struct surface, protected.public)
 #define CORE_SURFACE_TO_SURFACE(core_surface) container_of(core_surface, struct surface, protected)
 
 #define DC_GAMMA_TO_GAMMA(dc_gamma) \
 	container_of(dc_gamma, struct gamma, protected.public)
+#define DC_TRANSFER_FUNC_TO_TRANSFER_FUNC(dc_tf) \
+	container_of(dc_tf, struct transfer_func, protected.public)
 #define CORE_GAMMA_TO_GAMMA(core_gamma) \
 	container_of(core_gamma, struct gamma, protected)
 
@@ -66,6 +73,12 @@ static void destruct(struct surface *surface)
 {
 	if (surface->protected.public.gamma_correction != NULL)
 		dc_gamma_release(surface->protected.public.gamma_correction);
+	if (surface->protected.public.in_transfer_func != NULL)
+		dc_transfer_func_release(
+				surface->protected.public.in_transfer_func);
+	if (surface->protected.public.out_transfer_func != NULL)
+		dc_transfer_func_release(
+				surface->protected.public.out_transfer_func);
 }
 
 /*******************************************************************************
@@ -163,16 +176,6 @@ void dc_surface_release(const struct dc_surface *dc_surface)
 	}
 }
 
-static bool construct_gamma(struct gamma *gamma)
-{
-	return true;
-}
-
-static void destruct_gamma(struct gamma *gamma)
-{
-
-}
-
 void dc_gamma_retain(const struct dc_gamma *dc_gamma)
 {
 	struct gamma *gamma = DC_GAMMA_TO_GAMMA(dc_gamma);
@@ -185,10 +188,8 @@ void dc_gamma_release(const struct dc_gamma *dc_gamma)
 	struct gamma *gamma = DC_GAMMA_TO_GAMMA(dc_gamma);
 	--gamma->ref_count;
 
-	if (gamma->ref_count == 0) {
-		destruct_gamma(gamma);
+	if (gamma->ref_count == 0)
 		dm_free(gamma);
-	}
 }
 
 struct dc_gamma *dc_create_gamma()
@@ -198,17 +199,44 @@ struct dc_gamma *dc_create_gamma()
 	if (gamma == NULL)
 		goto alloc_fail;
 
-	if (false == construct_gamma(gamma))
-		goto construct_fail;
-
 	dc_gamma_retain(&gamma->protected.public);
 
 	return &gamma->protected.public;
 
-construct_fail:
-	dm_free(gamma);
+alloc_fail:
+	return NULL;
+}
+
+void dc_transfer_func_retain(const struct dc_transfer_func *dc_tf)
+{
+	struct transfer_func *tf = DC_TRANSFER_FUNC_TO_TRANSFER_FUNC(dc_tf);
+
+	++tf->ref_count;
+}
+
+void dc_transfer_func_release(const struct dc_transfer_func *dc_tf)
+{
+	struct transfer_func *tf = DC_TRANSFER_FUNC_TO_TRANSFER_FUNC(dc_tf);
+	--tf->ref_count;
+
+	if (tf->ref_count == 0)
+		dm_free(tf);
+}
+
+struct dc_transfer_func *dc_create_transfer_func(const struct dc *dc)
+{
+	struct core_dc *core_dc = DC_TO_CORE(dc);
+	struct transfer_func *tf = dm_alloc(sizeof(*tf));
+
+	if (tf == NULL)
+		goto alloc_fail;
+
+	dc_transfer_func_retain(&tf->protected.public);
+
+	return &tf->protected.public;
 
 alloc_fail:
 	return NULL;
 }
 
+

drivers/gpu/drm/amd/display/dc/dc.h

@@ -201,7 +201,8 @@ bool dc_init_dchub(struct dc *dc, struct dchub_init_data *dh_data);
 
 enum {
 	RGB_256X3X16 = 256,
-	FLOAT_GAMMA_RAMP_MAX = 1025
+	FLOAT_GAMMA_RAMP_MAX = 1025,
+	TRANSFER_FUNC_POINTS = 1025
 };
 
 enum dc_gamma_ramp_type {
@@ -236,6 +237,31 @@ struct dc_gamma {
 	uint32_t size;
 };
 
+enum dc_transfer_func_type {
+	TF_TYPE_PREDEFINED,
+	TF_TYPE_DISTRIBUTED_POINTS,
+};
+
+struct dc_transfer_func_distributed_points {
+	uint16_t red[TRANSFER_FUNC_POINTS];
+	uint16_t green[TRANSFER_FUNC_POINTS];
+	uint16_t blue[TRANSFER_FUNC_POINTS];
+	uint16_t end_exponent;
+	uint16_t x_point_at_y1;
+};
+
+enum dc_transfer_func_predefined {
+	TRANSFER_FUNCTION_SRGB,
+	TRANSFER_FUNCTION_BT709,
+	TRANSFER_FUNCTION_LINEAR,
+};
+
+struct dc_transfer_func {
+	enum dc_transfer_func_type type;
+	enum dc_transfer_func_predefined tf;
+	struct dc_transfer_func_distributed_points tf_pts;
+};
+
 struct dc_surface {
 	bool visible;
 	bool flip_immediate;
@@ -256,7 +282,11 @@ struct dc_surface {
 	bool horizontal_mirror;
 	enum plane_stereo_format stereo_format;
 
+	/* TO BE REMOVED AFTER BELOW TRANSFER FUNCTIONS IMPLEMENTED */
 	const struct dc_gamma *gamma_correction;
+
+	const struct dc_transfer_func *in_transfer_func;
+	const struct dc_transfer_func *out_transfer_func;
 };
 
 struct dc_plane_info {
@@ -287,8 +317,12 @@ struct dc_surface_update {
 	/* following updates require alloc/sleep/spin that is not isr safe,
 	 * null means no updates
 	 */
+	/* gamma TO BE REMOVED */
 	struct dc_gamma *gamma;
 
+	struct dc_transfer_func *in_transfer_func;
+	struct dc_transfer_func *out_transfer_func;
+
 
 };
 /*
@@ -316,6 +350,10 @@ void dc_gamma_retain(const struct dc_gamma *dc_gamma);
 void dc_gamma_release(const struct dc_gamma *dc_gamma);
 struct dc_gamma *dc_create_gamma(void);
 
+void dc_transfer_func_retain(const struct dc_transfer_func *dc_tf);
+void dc_transfer_func_release(const struct dc_transfer_func *dc_tf);
+struct dc_transfer_func *dc_create_transfer_func(const struct dc *dc);
+
 /*
  * This structure holds a surface address.  There could be multiple addresses
  * in cases such as Stereo 3D, Planar YUV, etc.  Other per-flip attributes such

drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c

@@ -231,16 +231,20 @@ static void build_prescale_params(struct ipp_prescale_params *prescale_params,
 	}
 }
 
-static bool set_gamma_ramp(
-	struct input_pixel_processor *ipp,
-	struct output_pixel_processor *opp,
-	const struct core_gamma *ramp,
+static bool dce110_set_gamma_correction(
+	struct pipe_ctx *pipe_ctx,
 	const struct core_surface *surface)
 {
+	struct input_pixel_processor *ipp = pipe_ctx->ipp;
+	struct output_pixel_processor *opp = pipe_ctx->opp;
+	const struct core_gamma *ramp = NULL;
 	struct ipp_prescale_params prescale_params = { 0 };
 	struct pwl_params *regamma_params;
 	bool result = false;
 
+	if (surface->public.gamma_correction)
+		ramp = DC_GAMMA_TO_CORE(surface->public.gamma_correction);
+
 	regamma_params = dm_alloc(sizeof(struct pwl_params));
 	if (regamma_params == NULL)
 		goto regamma_alloc_fail;
@@ -1842,33 +1846,13 @@ static void dce110_program_front_end_for_pipe(
 			pipe_ctx->scl_data.recout.y);
 }
 
-
-
-static void dce110_prepare_pipe_for_surface_commit(
-		struct core_dc *dc,
-		struct pipe_ctx *pipe_ctx,
-		struct validate_context *context) {
-	struct core_gamma *gamma = NULL;
-
-	dc->hwss.increase_watermarks_for_pipe(dc, pipe_ctx, context);
-
-	if (pipe_ctx->surface->public.gamma_correction)
-		gamma = DC_GAMMA_TO_CORE(
-			pipe_ctx->surface->public.gamma_correction);
-
-	dc->hwss.set_gamma_correction(
-			pipe_ctx->ipp,
-			pipe_ctx->opp,
-			gamma, pipe_ctx->surface);
-}
-
 static void dce110_prepare_pipe_for_context(
 		struct core_dc *dc,
 		struct pipe_ctx *pipe_ctx,
 		struct validate_context *context)
 {
 	dce110_power_on_pipe_if_needed(dc, pipe_ctx, context);
-	dce110_prepare_pipe_for_surface_commit(dc, pipe_ctx, context);
+	dc->hwss.increase_watermarks_for_pipe(dc, pipe_ctx, context);
 }
 
 static void dce110_apply_ctx_for_surface(
@@ -1920,7 +1904,7 @@ static const struct hw_sequencer_funcs dce110_funcs = {
 	.set_plane_config = set_plane_config,
 	.update_plane_addr = update_plane_addr,
 	.update_pending_status = dce110_update_pending_status,
-	.set_gamma_correction = set_gamma_ramp,
+	.set_gamma_correction = dce110_set_gamma_correction,
 	.power_down = dce110_power_down,
 	.enable_accelerated_mode = dce110_enable_accelerated_mode,
 	.enable_timing_synchronization = dce110_enable_timing_synchronization,

drivers/gpu/drm/amd/display/dc/inc/core_types.h

@@ -66,6 +66,11 @@ struct core_gamma {
 	struct dc_context *ctx;
 };
 
+struct core_transfer_func {
+	struct dc_transfer_func public;
+	struct dc_context *ctx;
+};
+
 void enable_surface_flip_reporting(struct dc_surface *dc_surface,
 		uint32_t controller_id);
 

drivers/gpu/drm/amd/display/dc/inc/hw_sequencer.h

@@ -78,9 +78,7 @@ struct hw_sequencer_funcs {
 			struct pipe_ctx *pipe_ctx);
 
 	bool (*set_gamma_correction)(
-				struct input_pixel_processor *ipp,
-				struct output_pixel_processor *opp,
-				const struct core_gamma *ramp,
+				struct pipe_ctx *pipe_ctx,
 				const struct core_surface *surface);
 
 	void (*power_down)(struct core_dc *dc);