drm/amd/display: Add opp recout adjustment

[Why]
For subsampled YUV output formats, more pixels can get fetched and be
used for scaling.

[How]
Add the adjustment to the calculated recout, so the viewport covers the
corresponding pixels on the source plane.

Signed-off-by: Navid Assadian <Navid.Assadian@amd.com>
Reviewed-by: Samson Tam <Samson.Tam@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

Author: Navid Assadian

drivers/gpu/drm/amd/display/dc/sspl/dc_spl.c

@@ -76,6 +76,21 @@ static struct spl_rect shift_rec(const struct spl_rect *rec_in, int x, int y)
 	return rec_out;
 }
 
+static void spl_opp_adjust_rect(struct spl_rect *rec, const struct spl_opp_adjust *adjust)
+{
+	if ((rec->x + adjust->x) >= 0)
+		rec->x += adjust->x;
+
+	if ((rec->y + adjust->y) >= 0)
+		rec->y += adjust->y;
+
+	if ((rec->width + adjust->width) >= 1)
+		rec->width += adjust->width;
+
+	if ((rec->height + adjust->height) >= 1)
+		rec->height += adjust->height;
+}
+
 static struct spl_rect calculate_plane_rec_in_timing_active(
 		struct spl_in *spl_in,
 		const struct spl_rect *rec_in)
@@ -723,13 +738,15 @@ static void spl_handle_3d_recout(struct spl_in *spl_in, struct spl_rect *recout)
 	}
 }
 
-static void spl_clamp_viewport(struct spl_rect *viewport)
+static void spl_clamp_viewport(struct spl_rect *viewport, int min_viewport_size)
 {
+	if (min_viewport_size == 0)
+		min_viewport_size = MIN_VIEWPORT_SIZE;
 	/* Clamp minimum viewport size */
-	if (viewport->height < MIN_VIEWPORT_SIZE)
-		viewport->height = MIN_VIEWPORT_SIZE;
-	if (viewport->width < MIN_VIEWPORT_SIZE)
-		viewport->width = MIN_VIEWPORT_SIZE;
+	if (viewport->height < min_viewport_size)
+		viewport->height = min_viewport_size;
+	if (viewport->width < min_viewport_size)
+		viewport->width = min_viewport_size;
 }
 
 static enum scl_mode spl_get_dscl_mode(const struct spl_in *spl_in,
@@ -1764,6 +1781,8 @@ static bool spl_calculate_number_of_taps(struct spl_in *spl_in, struct spl_scrat
 	spl_calculate_recout(spl_in, spl_scratch, spl_out);
 	/* depends on pixel format */
 	spl_calculate_scaling_ratios(spl_in, spl_scratch, spl_out);
+	/* Adjust recout for opp if needed */
+	spl_opp_adjust_rect(&spl_scratch->scl_data.recout, &spl_in->basic_in.opp_recout_adjust);
 	/* depends on scaling ratios and recout, does not calculate offset yet */
 	spl_calculate_viewport_size(spl_in, spl_scratch);
 
@@ -1800,7 +1819,7 @@ bool spl_calculate_scaler_params(struct spl_in *spl_in, struct spl_out *spl_out)
 	// Handle 3d recout
 	spl_handle_3d_recout(spl_in, &spl_scratch.scl_data.recout);
 	// Clamp
-	spl_clamp_viewport(&spl_scratch.scl_data.viewport);
+	spl_clamp_viewport(&spl_scratch.scl_data.viewport, spl_in->min_viewport_size);
 
 	// Save all calculated parameters in dscl_prog_data structure to program hw registers
 	spl_set_dscl_prog_data(spl_in, &spl_scratch, spl_out, enable_easf_v, enable_easf_h, enable_isharp);

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

@@ -427,6 +427,14 @@ struct spl_out	{
 
 // SPL inputs
 
+// opp extra adjustment for rect
+struct spl_opp_adjust {
+	int x;
+	int y;
+	int width;
+	int height;
+};
+
 // Basic input information
 struct basic_in	{
 	enum spl_pixel_format format; // Pixel Format
@@ -444,6 +452,7 @@ struct basic_in	{
 		} num_slices_recout_width;
 	} num_h_slices_recout_width_align;
 	int mpc_h_slice_index; // previous mpc_combine_v - split_idx
+	struct spl_opp_adjust opp_recout_adjust;
 	// Inputs for adaptive scaler - TODO
 	enum spl_transfer_func_type tf_type; /* Transfer function type */
 	enum spl_transfer_func_predefined tf_predefined_type; /* Transfer function predefined type */
@@ -535,6 +544,7 @@ struct spl_in	{
 	bool is_hdr_on;
 	int h_active;
 	int v_active;
+	int min_viewport_size;
 	int sdr_white_level_nits;
 	enum sharpen_policy sharpen_policy;
 };