[PATCH 17/23] drm/amd/display: Remove always-false branches

[Alex Hung]

[WHAT & HOW]
req128_c is always set to false and its branch is never taken.
Similarly, MacroTileSizeBytes is set to either 256 or 65535 and it is
never 4096 and it's branch is not taken.

Therefore, their branches are removed.

This fixes 3 DEADCODE issues reported by Coverity.

Acked-by: Alex Hung <alex.hung at amd.com>
Reviewed-by: Alvin Lee <alvin.lee2 at amd.com>
Reviewed-by: Rodrigo Siqueira <rodrigo.siqueira at amd.com>
Signed-off-by: Alex Hung <alex.hung at amd.com>
---
 .../amd/display/dc/dml/dcn20/display_rq_dlg_calc_20.c    | 3 ---
 .../amd/display/dc/dml/dcn20/display_rq_dlg_calc_20v2.c  | 3 ---
 .../drm/amd/display/dc/dml/dcn31/display_mode_vba_31.c   | 9 ---------
 3 files changed, 15 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn20/display_rq_dlg_calc_20.c b/drivers/gpu/drm/amd/display/dc/dml/dcn20/display_rq_dlg_calc_20.c
index e7019c95ba79..4fce64a030b6 100644
--- a/drivers/gpu/drm/amd/display/dc/dml/dcn20/display_rq_dlg_calc_20.c
+++ b/drivers/gpu/drm/amd/display/dc/dml/dcn20/display_rq_dlg_calc_20.c
@@ -313,9 +313,6 @@ static void handle_det_buf_split(struct display_mode_lib *mode_lib,
 
 		if (swath_height_c > 0)
 			log2_swath_height_c = dml_log2(swath_height_c);
-
-		if (req128_c && log2_swath_height_c > 0)
-			log2_swath_height_c -= 1;
 	}
 
 	rq_param->dlg.rq_l.swath_height = 1 << log2_swath_height_l;
diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn20/display_rq_dlg_calc_20v2.c b/drivers/gpu/drm/amd/display/dc/dml/dcn20/display_rq_dlg_calc_20v2.c
index ae5251041728..3fa9a5da02f6 100644
--- a/drivers/gpu/drm/amd/display/dc/dml/dcn20/display_rq_dlg_calc_20v2.c
+++ b/drivers/gpu/drm/amd/display/dc/dml/dcn20/display_rq_dlg_calc_20v2.c
@@ -313,9 +313,6 @@ static void handle_det_buf_split(struct display_mode_lib *mode_lib,
 
 		if (swath_height_c > 0)
 			log2_swath_height_c = dml_log2(swath_height_c);
-
-		if (req128_c && log2_swath_height_c > 0)
-			log2_swath_height_c -= 1;
 	}
 
 	rq_param->dlg.rq_l.swath_height = 1 << log2_swath_height_l;
diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn31/display_mode_vba_31.c b/drivers/gpu/drm/amd/display/dc/dml/dcn31/display_mode_vba_31.c
index 0b132ce1d2cd..2b275e680379 100644
--- a/drivers/gpu/drm/amd/display/dc/dml/dcn31/display_mode_vba_31.c
+++ b/drivers/gpu/drm/amd/display/dc/dml/dcn31/display_mode_vba_31.c
@@ -1924,15 +1924,6 @@ static unsigned int CalculateVMAndRowBytes(
 		*PixelPTEReqWidth = 32768.0 / BytePerPixel;
 		*PTERequestSize = 64;
 		FractionOfPTEReturnDrop = 0;
-	} else if (MacroTileSizeBytes == 4096) {
-		PixelPTEReqHeightPTEs = 1;
-		*PixelPTEReqHeight = MacroTileHeight;
-		*PixelPTEReqWidth = 8 * *MacroTileWidth;
-		*PTERequestSize = 64;
-		if (ScanDirection != dm_vert)
-			FractionOfPTEReturnDrop = 0;
-		else
-			FractionOfPTEReturnDrop = 7.0 / 8;
 	} else if (GPUVMMinPageSize == 4 && MacroTileSizeBytes > 4096) {
 		PixelPTEReqHeightPTEs = 16;
 		*PixelPTEReqHeight = 16 * BlockHeight256Bytes;
-- 
2.34.1