[SRU][R][PATCH 1/1] drm/amd/pm: smu_v14_0_0: use SoftMin for gfxclk in set_soft_freq_limited_range

[Yo-Jung Leo Lin (AMD)]

From: Priya Hosur <Priya.Hosur at amd.com>

BugLink: https://bugs.launchpad.net/bugs/2156858

In smu_v14_0_0_set_soft_freq_limited_range(), the gfxclk floor is
programmed via SetHardMinGfxClk together with SetSoftMaxGfxClk. Under
power_dpm_force_performance_level=high this pins HardMin to peak gfxclk.

In PMFW arbitration HardMin has higher priority than SoftMax, so the
firmware thermal/PPT throttler cannot clamp gfxclk via SoftMax once
HardMin is set to peak. Replace SetHardMinGfxClk with SetSoftMinGfxclk
so the driver still requests peak performance but the firmware
throttler retains the ability to clamp gfxclk under thermal/PPT
pressure. SoftMax handling is unchanged and no other clock domains
are affected.

Signed-off-by: Priya Hosur <Priya.Hosur at amd.com>
Acked-by: Alex Deucher <alexander.deucher at amd.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
(cherry picked from commit 3ea273267fd29cbf6d83ee72329f59eb5042605b)
Cc: stable at vger.kernel.org
(cherry picked from commit 03b70e0d8aa26bab89a0f1394c1c80a871925e42)
Signed-off-by: Yo-Jung Leo Lin (AMD) <Leo.Lin at amd.com>
---
 drivers/gpu/drm/amd/pm/swsmu/smu14/smu_v14_0_0_ppt.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu14/smu_v14_0_0_ppt.c b/drivers/gpu/drm/amd/pm/swsmu/smu14/smu_v14_0_0_ppt.c
index 2353524b8821..936174d72874 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/smu14/smu_v14_0_0_ppt.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/smu14/smu_v14_0_0_ppt.c
@@ -1228,7 +1228,8 @@ static int smu_v14_0_0_set_soft_freq_limited_range(struct smu_context *smu,
 	switch (clk_type) {
 	case SMU_GFXCLK:
 	case SMU_SCLK:
-		msg_set_min = SMU_MSG_SetHardMinGfxClk;
+		/* SoftMin lets PMFW throttle gfxclk; HardMin would override SoftMax. */
+		msg_set_min = SMU_MSG_SetSoftMinGfxclk;
 		msg_set_max = SMU_MSG_SetSoftMaxGfxClk;
 		break;
 	case SMU_FCLK:
-- 
2.43.0