[PATCH AUTOSEL 5.18 17/93] drm/amd/display: Reduce frame size in the bouding box for DCN20

Sasha Levin
2022-08-11T15:53:55Z

From: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>

[ Upstream commit c55300ad4a1814bac9191a4d2c7b0d74273aec7c ]

GCC throw warnings for the function dcn20_update_bounding_box due to its
frame size that looks like this:

error: the frame size of 1936 bytes is larger than 1024 bytes [-Werror=frame-larger-than=]

This commit fixes this issue by eliminating an intermediary variable
that creates a large array.

Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Hamza Mahfooz <hamza.mahfooz@amd.com>
Cc: Aurabindo Pillai <aurabindo.pillai@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
.../drm/amd/display/dc/dml/dcn20/dcn20_fpu.c | 38 +++++++++----------
1 file changed, 18 insertions(+), 20 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn20/dcn20_fpu.c b/drivers/gpu/drm/amd/display/dc/dml/dcn20/dcn20_fpu.c
index f93af45aeab4..c758f84baaf5 100644
--- a/drivers/gpu/drm/amd/display/dc/dml/dcn20/dcn20_fpu.c
+++ b/drivers/gpu/drm/amd/display/dc/dml/dcn20/dcn20_fpu.c
@@ -1430,21 +1430,20 @@ void dcn20_calculate_wm(
void dcn20_update_bounding_box(struct dc *dc, struct _vcs_dpi_soc_bounding_box_st *bb,
struct pp_smu_nv_clock_table *max_clocks, unsigned int *uclk_states, unsigned int num_states)
{
- struct _vcs_dpi_voltage_scaling_st calculated_states[DC__VOLTAGE_STATES];
- int i;
int num_calculated_states = 0;
int min_dcfclk = 0;
+ int i;

dc_assert_fp_enabled();

if (num_states == 0)
return;

- memset(calculated_states, 0, sizeof(calculated_states));
+ memset(bb->clock_limits, 0, sizeof(bb->clock_limits));

- if (dc->bb_overrides.min_dcfclk_mhz > 0)
+ if (dc->bb_overrides.min_dcfclk_mhz > 0) {
min_dcfclk = dc->bb_overrides.min_dcfclk_mhz;
- else {
+ } else {
if (ASICREV_IS_NAVI12_P(dc->ctx->asic_id.hw_internal_rev))
min_dcfclk = 310;
else
@@ -1455,36 +1454,35 @@ void dcn20_update_bounding_box(struct dc *dc, struct _vcs_dpi_soc_bounding_box_s

for (i = 0; i < num_states; i++) {
int min_fclk_required_by_uclk;
- calculated_states[i].state = i;
- calculated_states[i].dram_speed_mts = uclk_states[i] * 16 / 1000;
+ bb->clock_limits[i].state = i;
+ bb->clock_limits[i].dram_speed_mts = uclk_states[i] * 16 / 1000;

// FCLK:UCLK ratio is 1.08
min_fclk_required_by_uclk = div_u64(((unsigned long long)uclk_states[i]) * 1080,
1000000);

- calculated_states[i].fabricclk_mhz = (min_fclk_required_by_uclk < min_dcfclk) ?
+ bb->clock_limits[i].fabricclk_mhz = (min_fclk_required_by_uclk < min_dcfclk) ?
min_dcfclk : min_fclk_required_by_uclk;

- calculated_states[i].socclk_mhz = (calculated_states[i].fabricclk_mhz > max_clocks->socClockInKhz / 1000) ?
- max_clocks->socClockInKhz / 1000 : calculated_states[i].fabricclk_mhz;
+ bb->clock_limits[i].socclk_mhz = (bb->clock_limits[i].fabricclk_mhz > max_clocks->socClockInKhz / 1000) ?
+ max_clocks->socClockInKhz / 1000 : bb->clock_limits[i].fabricclk_mhz;

- calculated_states[i].dcfclk_mhz = (calculated_states[i].fabricclk_mhz > max_clocks->dcfClockInKhz / 1000) ?
- max_clocks->dcfClockInKhz / 1000 : calculated_states[i].fabricclk_mhz;
+ bb->clock_limits[i].dcfclk_mhz = (bb->clock_limits[i].fabricclk_mhz > max_clocks->dcfClockInKhz / 1000) ?
+ max_clocks->dcfClockInKhz / 1000 : bb->clock_limits[i].fabricclk_mhz;

- calculated_states[i].dispclk_mhz = max_clocks->displayClockInKhz / 1000;
- calculated_states[i].dppclk_mhz = max_clocks->displayClockInKhz / 1000;
- calculated_states[i].dscclk_mhz = max_clocks->displayClockInKhz / (1000 * 3);
+ bb->clock_limits[i].dispclk_mhz = max_clocks->displayClockInKhz / 1000;
+ bb->clock_limits[i].dppclk_mhz = max_clocks->displayClockInKhz / 1000;
+ bb->clock_limits[i].dscclk_mhz = max_clocks->displayClockInKhz / (1000 * 3);

- calculated_states[i].phyclk_mhz = max_clocks->phyClockInKhz / 1000;
+ bb->clock_limits[i].phyclk_mhz = max_clocks->phyClockInKhz / 1000;

num_calculated_states++;
}

- calculated_states[num_calculated_states - 1].socclk_mhz = max_clocks->socClockInKhz / 1000;
- calculated_states[num_calculated_states - 1].fabricclk_mhz = max_clocks->socClockInKhz / 1000;
- calculated_states[num_calculated_states - 1].dcfclk_mhz = max_clocks->dcfClockInKhz / 1000;
+ bb->clock_limits[num_calculated_states - 1].socclk_mhz = max_clocks->socClockInKhz / 1000;
+ bb->clock_limits[num_calculated_states - 1].fabricclk_mhz = max_clocks->socClockInKhz / 1000;
+ bb->clock_limits[num_calculated_states - 1].dcfclk_mhz = max_clocks->dcfClockInKhz / 1000;

- memcpy(bb->clock_limits, calculated_states, sizeof(bb->clock_limits));
bb->num_states = num_calculated_states;

// Duplicate the last state, DML always an extra state identical to max state to work
--
2.35.1