drm/amd/display: Add fullscreen only sharpening policy

[WHAT & HOW]
Disable sharpening if not in fullscreen if this policy is selected
Reviewed-by: Samson Tam <samson.tam@amd.com>
Signed-off-by: Relja Vojvodic <Relja.Vojvodic@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -853,6 +853,9 @@ static bool spl_get_isharp_en(struct spl_in *spl_in,
 	else if ((spl_is_yuv420(spl_in->basic_in.format) && !fullscreen) &&
 		(spl_in->debug.sharpen_policy == SHARPEN_RGB_FULLSCREEN_YUV))
 		return enable_isharp;
+	else if (!spl_in->is_fullscreen &&
+			spl_in->debug.sharpen_policy == SHARPEN_FULLSCREEN_ALL)
+		return enable_isharp;
 
 	/*
 	 * Apply sharpness if supports horizontal taps 4,6 AND

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

@@ -490,7 +490,8 @@ enum linear_light_scaling	{	// convert it in translation logic
 enum sharpen_policy {
 	SHARPEN_ALWAYS = 0,
 	SHARPEN_YUV = 1,
-	SHARPEN_RGB_FULLSCREEN_YUV = 2
+	SHARPEN_RGB_FULLSCREEN_YUV = 2,
+	SHARPEN_FULLSCREEN_ALL = 3
 };
 enum scale_to_sharpness_policy {
 	NO_SCALE_TO_SHARPNESS_ADJ = 0,