Hi,

On 12/08/2022 00:19, Jiapeng Chong wrote:
drivers/gpu/drm/amd/amdgpu/../display/dc/dml/dcn32/display_mode_vba_util_32.c:1658
 dml32_TruncToValidBPP() warn: ignoring unreachable code.

Link: https://bugzilla.openanolis.cn/show_bug.cgi?id=1894
Reported-by: Abaci Robot <ab...@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.ch...@linux.alibaba.com>
---
  .../drm/amd/display/dc/dml/dcn32/display_mode_vba_util_32.c   | 4 ----
  1 file changed, 4 deletions(-)

diff --git 
a/drivers/gpu/drm/amd/display/dc/dml/dcn32/display_mode_vba_util_32.c 
b/drivers/gpu/drm/amd/display/dc/dml/dcn32/display_mode_vba_util_32.c
index 05fc14a47fba..0758e1da55a9 100644
--- a/drivers/gpu/drm/amd/display/dc/dml/dcn32/display_mode_vba_util_32.c
+++ b/drivers/gpu/drm/amd/display/dc/dml/dcn32/display_mode_vba_util_32.c
@@ -1654,10 +1654,6 @@ double dml32_TruncToValidBPP(
                else
                        return DesiredBPP;
        }
-
-       *RequiredSlots = dml_ceil(DesiredBPP / MaxLinkBPP * 64, 1);
-
-       return BPP_INVALID;
  } // TruncToValidBPP
double dml32_RequiredDTBCLK(

Seems correct.

Reviewed-by: Tales Aparecida <tales.aparec...@gmail.com>

I feel like RequiredSlots is not actually used anywhere in the code, just passed around dml32_TruncToValidBPP() and dml32_CalculateOutputLink(). I've looked for any mentions of it in the mailing list, but could not find anything that implied it's part of ground working. I wonder if it's something outside the Linux tree for other platforms or related to HW gospel.

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