[PATCH 6.18 106/122] drm/amd/pm: fix smu v14 soft clock frequency setting issue

Greg Kroah-Hartman
2026-02-04T15:33:49Z

From: Yang Wang <kevinyang.wang@amd.com>

commit 239d0ccf567c3b09aed58eb88cd3376af37aaf14 upstream.

v1:
resolve the issue where some freq frequencies cannot be set correctly
due to insufficient floating-point precision.

v2:
patch this convert on 'max' value only.

Signed-off-by: Yang Wang <kevinyang.wang@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 53868dd8774344051999c880115740da92f97feb)
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/gpu/drm/amd/pm/swsmu/inc/smu_v14_0.h | 1 +
drivers/gpu/drm/amd/pm/swsmu/smu14/smu_v14_0.c | 1 +
2 files changed, 2 insertions(+)

--- a/drivers/gpu/drm/amd/pm/swsmu/inc/smu_v14_0.h
+++ b/drivers/gpu/drm/amd/pm/swsmu/inc/smu_v14_0.h
@@ -57,6 +57,7 @@ extern const int decoded_link_width[8];

#define DECODE_GEN_SPEED(gen_speed_idx) (decoded_link_speed[gen_speed_idx])
#define DECODE_LANE_WIDTH(lane_width_idx) (decoded_link_width[lane_width_idx])
+#define SMU_V14_SOFT_FREQ_ROUND(x) ((x) + 1)

struct smu_14_0_max_sustainable_clocks {
uint32_t display_clock;
--- a/drivers/gpu/drm/amd/pm/swsmu/smu14/smu_v14_0.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/smu14/smu_v14_0.c
@@ -1178,6 +1178,7 @@ int smu_v14_0_set_soft_freq_limited_rang
return clk_id;

if (max > 0) {
+ max = SMU_V14_SOFT_FREQ_ROUND(max);
if (automatic)
param = (uint32_t)((clk_id << 16) | 0xffff);
else