drm/amd/display: Limit Scaling Ratio on DCN3.01

[why]
Underflow and flickering was occuring due to high scaling ratios
when resizing videos.

[how]
Limit the scaling ratios by increasing the max scaling factor

Reviewed-by: Nicholas Kazlauskas <[email protected]>
Signed-off-by: Gabe Teeger <[email protected]>
Signed-off-by: Tom Chung <[email protected]>
Tested-by: Daniel Wheeler <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

Author: Gabe Teeger

drivers/gpu/drm/amd/display/dc/resource/dcn301/dcn301_resource.c

@@ -671,9 +671,9 @@ static const struct dc_plane_cap plane_cap = {
 
 	/* 6:1 downscaling ratio: 1000/6 = 166.666 */
 	.max_downscale_factor = {
-			.argb8888 = 167,
-			.nv12 = 167,
-			.fp16 = 167 
+			.argb8888 = 358,
+			.nv12 = 358,
+			.fp16 = 358
 	},
 	64,
 	64
@@ -693,7 +693,7 @@ static const struct dc_debug_options debug_defaults_drv = {
 	.disable_dcc = DCC_ENABLE,
 	.vsr_support = true,
 	.performance_trace = false,
-	.max_downscale_src_width = 7680,/*upto 8K*/
+	.max_downscale_src_width = 4096,/*upto true 4k*/
 	.scl_reset_length10 = true,
 	.sanity_checks = false,
 	.underflow_assert_delay_us = 0xFFFFFFFF,