From: Alex Hung <alex.hung@amd.com>
Date: Thu, 29 Aug 2024 22:35:51 +0000 (-0600)
Subject: drm/amd/display: Remove always-false branches
X-Git-Tag: v6.12-rc1~15^2^2~31
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b6499840cafca25175f43ebd601913bf31d06f16;p=thirdparty%2Flinux.git

drm/amd/display: Remove always-false branches

[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@amd.com>
Reviewed-by: Alvin Lee <alvin.lee2@amd.com>
Reviewed-by: Rodrigo Siqueira <rodrigo.siqueira@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---

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 e7019c95ba79e..4fce64a030b60 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 ae52510417280..3fa9a5da02f6a 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 0b132ce1d2cdc..2b275e6803797 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;