[PATCH 17/50] drm/amd/display: Initialize denominators' default to 1

[Fangzhi Zuo]

From: Alex Hung <alex.h...@amd.com>

[WHAT & HOW]
Variables used as denominators and maybe not assigned to other values,
should not be 0. Change their default to 1 so they are never 0.

This fixes 10 DIVIDE_BY_ZERO issues reported by Coverity.

Reviewed-by: Harry Wentland <harry.wentl...@amd.com>
Signed-off-by: Jerry Zuo <jerry....@amd.com>
Signed-off-by: Alex Hung <alex.h...@amd.com>
---
 .../gpu/drm/amd/display/dc/dml/dcn20/display_rq_dlg_calc_20.c | 2 +-
 drivers/gpu/drm/amd/display/dc/dml/dml1_display_rq_dlg_calc.c | 2 +-
 .../display/dc/dml2/dml21/src/dml2_core/dml2_core_shared.c    | 4 ++--
 3 files changed, 4 insertions(+), 4 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 7c56ad0f8812..e7019c95ba79 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
@@ -78,7 +78,7 @@ static void calculate_ttu_cursor(struct display_mode_lib 
*mode_lib,
 
 static unsigned int get_bytes_per_element(enum source_format_class 
source_format, bool is_chroma)
 {
-       unsigned int ret_val = 0;
+       unsigned int ret_val = 1;
 
        if (source_format == dm_444_16) {
                if (!is_chroma)
diff --git a/drivers/gpu/drm/amd/display/dc/dml/dml1_display_rq_dlg_calc.c 
b/drivers/gpu/drm/amd/display/dc/dml/dml1_display_rq_dlg_calc.c
index dae13f202220..d8bfc85e5dcd 100644
--- a/drivers/gpu/drm/amd/display/dc/dml/dml1_display_rq_dlg_calc.c
+++ b/drivers/gpu/drm/amd/display/dc/dml/dml1_display_rq_dlg_calc.c
@@ -39,7 +39,7 @@
 
 static unsigned int get_bytes_per_element(enum source_format_class 
source_format, bool is_chroma)
 {
-       unsigned int ret_val = 0;
+       unsigned int ret_val = 1;
 
        if (source_format == dm_444_16) {
                if (!is_chroma)
diff --git 
a/drivers/gpu/drm/amd/display/dc/dml2/dml21/src/dml2_core/dml2_core_shared.c 
b/drivers/gpu/drm/amd/display/dc/dml2/dml21/src/dml2_core/dml2_core_shared.c
index 81f0a6f19f87..679b20031903 100644
--- a/drivers/gpu/drm/amd/display/dc/dml2/dml21/src/dml2_core/dml2_core_shared.c
+++ b/drivers/gpu/drm/amd/display/dc/dml2/dml21/src/dml2_core/dml2_core_shared.c
@@ -9386,8 +9386,8 @@ static void CalculateVMGroupAndRequestTimes(
        double TimePerVMRequestVBlank[],
        double TimePerVMRequestFlip[])
 {
-       unsigned int num_group_per_lower_vm_stage = 0;
-       unsigned int num_req_per_lower_vm_stage = 0;
+       unsigned int num_group_per_lower_vm_stage = 1;
+       unsigned int num_req_per_lower_vm_stage = 1;
 
 #ifdef __DML_VBA_DEBUG__
        dml2_printf("DML::%s: NumberOfActiveSurfaces = %u\n", __func__, 
NumberOfActiveSurfaces);
-- 
2.34.1