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From 5ba99cdaa75b41227f78ad74625b07a686bc0279 Mon Sep 17 00:00:00 2001
From: Joseph Gravenor <joseph.gravenor@amd.com>
Date: Thu, 17 Oct 2019 11:56:34 -0400
Subject: [PATCH 4473/4736] drm/amd/display: Renoir chroma viewport WA change
formula
[why]
we want to increase the pte row plus 1 line if chroma viewport
height is integer multiple of the pte row height
[how]
instead of ceiling viewport height, we floor it. this allows
us to accommodate both cases: those where the chroma viewport
height is integer multiple of the pte row height and those where
it is not
Signed-off-by: Joseph Gravenor <joseph.gravenor@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
---
drivers/gpu/drm/amd/display/dc/dcn21/dcn21_hubp.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_hubp.c b/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_hubp.c
index 1ddd6ae22155..d86b6b6211bc 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_hubp.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_hubp.c
@@ -204,8 +204,8 @@ void hubp21_set_viewport(
PTE_ROW_HEIGHT_LINEAR, &pte_row_height);
pte_row_height = 1 << (pte_row_height + 3);
- pte_rows = (viewport_c->height + pte_row_height - 1) / pte_row_height;
- patched_viewport_height = pte_rows * pte_row_height + 3;
+ pte_rows = (viewport_c->height / pte_row_height) + 1;
+ patched_viewport_height = pte_rows * pte_row_height + 1;
}
--
2.17.1
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