[PATCH 14/21] drm/amd/display: add workaround for subvp cursor corruption for DCN32/321

[Pavle Kotarac]

From: Aurabindo Pillai <aurabindo.pillai at amd.com>

[Why&How]
Kernel does not have a means to tell the userspace to use software
cursor. Due to lack of this functionality, reducing the max cursor size
is the only way to ensure that power savings of Subview port feature is
utilized for asics that support it. The workaround could be removed after
cursor caching is fixed while a subviewport config is active.

Reviewed-by: Alvin Lee <Alvin.Lee2 at amd.com>
Acked-by: Pavle Kotarac <Pavle.Kotarac at amd.com>
Signed-off-by: Aurabindo Pillai <aurabindo.pillai at amd.com>
---
 drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.c   | 3 ++-
 drivers/gpu/drm/amd/display/dc/dcn321/dcn321_resource.c | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.c b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.c
index 5953083b76a7..0b94a783d285 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.c
@@ -2116,7 +2116,8 @@ static bool dcn32_resource_construct(
 	dc->caps.max_downscale_ratio = 600;
 	dc->caps.i2c_speed_in_khz = 100;
 	dc->caps.i2c_speed_in_khz_hdcp = 100; /*1.4 w/a applied by default*/
-	dc->caps.max_cursor_size = 256;
+	/* TODO: Bring max_cursor_size back to 256 after subvp cursor corruption is fixed*/
+	dc->caps.max_cursor_size = 64;
 	dc->caps.min_horizontal_blanking_period = 80;
 	dc->caps.dmdata_alloc_size = 2048;
 	dc->caps.mall_size_per_mem_channel = 0;
diff --git a/drivers/gpu/drm/amd/display/dc/dcn321/dcn321_resource.c b/drivers/gpu/drm/amd/display/dc/dcn321/dcn321_resource.c
index 64c225ee3a46..b602fdbbaf10 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn321/dcn321_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn321/dcn321_resource.c
@@ -1721,7 +1721,8 @@ static bool dcn321_resource_construct(
 	dc->caps.max_downscale_ratio = 600;
 	dc->caps.i2c_speed_in_khz = 100;
 	dc->caps.i2c_speed_in_khz_hdcp = 100; /*1.4 w/a applied by default*/
-	dc->caps.max_cursor_size = 256;
+	/* TODO: Bring max cursor size back to 256 after subvp cursor corruption is fixed*/
+	dc->caps.max_cursor_size = 64;
 	dc->caps.min_horizontal_blanking_period = 80;
 	dc->caps.dmdata_alloc_size = 2048;
 	dc->caps.mall_size_per_mem_channel = 0;
-- 
2.34.1