[PATCH 17/20] drm/amd/display: Use the correct max downscaling value for DCN3.x family

[Stylon Wang]

From: Nikola Cornij <nikola.cor...@amd.com>

[why]
As per spec, DCN3.x can do 6:1 downscaling and DCN2.x can do 4:1. The
max downscaling limit value for DCN2.x is 250, which means it's
calculated as 1000 / 4 = 250. For DCN3.x this then gives 1000 / 6 = 167.

[how]
Set maximum downscaling limit to 167 for DCN3.x

Signed-off-by: Nikola Cornij <nikola.cor...@amd.com>
Reviewed-by: Charlene Liu <charlene....@amd.com>
Reviewed-by: Harry Wentland <harry.wentl...@amd.com>
Acked-by: Stylon Wang <stylon.w...@amd.com>
---
 drivers/gpu/drm/amd/display/dc/dcn30/dcn30_resource.c   | 7 ++++---
 drivers/gpu/drm/amd/display/dc/dcn301/dcn301_resource.c | 7 ++++---
 drivers/gpu/drm/amd/display/dc/dcn302/dcn302_resource.c | 7 ++++---
 3 files changed, 12 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_resource.c 
b/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_resource.c
index 45f96221a094..9109e2433965 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_resource.c
@@ -826,10 +826,11 @@ static const struct dc_plane_cap plane_cap = {
                        .fp16 = 16000
        },
 
+       /* 6:1 downscaling ratio: 1000/6 = 166.666 */
        .max_downscale_factor = {
-                       .argb8888 = 600,
-                       .nv12 = 600,
-                       .fp16 = 600
+                       .argb8888 = 167,
+                       .nv12 = 167,
+                       .fp16 = 167
        }
 };
 
diff --git a/drivers/gpu/drm/amd/display/dc/dcn301/dcn301_resource.c 
b/drivers/gpu/drm/amd/display/dc/dcn301/dcn301_resource.c
index 2127399cf464..63b09c1124c4 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn301/dcn301_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn301/dcn301_resource.c
@@ -843,10 +843,11 @@ static const struct dc_plane_cap plane_cap = {
                        .fp16 = 16000
        },
 
+       /* 6:1 downscaling ratio: 1000/6 = 166.666 */
        .max_downscale_factor = {
-                       .argb8888 = 600,
-                       .nv12 = 600,
-                       .fp16 = 600
+                       .argb8888 = 167,
+                       .nv12 = 167,
+                       .fp16 = 167 
        },
        64,
        64
diff --git a/drivers/gpu/drm/amd/display/dc/dcn302/dcn302_resource.c 
b/drivers/gpu/drm/amd/display/dc/dcn302/dcn302_resource.c
index fc2dea243d1b..a33f0365329b 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn302/dcn302_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn302/dcn302_resource.c
@@ -284,10 +284,11 @@ static const struct dc_plane_cap plane_cap = {
                                .nv12 = 16000,
                                .fp16 = 16000
                },
+               /* 6:1 downscaling ratio: 1000/6 = 166.666 */
                .max_downscale_factor = {
-                               .argb8888 = 600,
-                               .nv12 = 600,
-                               .fp16 = 600
+                               .argb8888 = 167,
+                               .nv12 = 167,
+                               .fp16 = 167
                },
                16,
                16
-- 
2.25.1

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