drm/amd/pm: restore SCLK settings after S0ix resume

User-configured SCLK(GPU core clock)frequencies were not persisting
across S0ix suspend/resume cycles on smu v14 hardware.
The issue occurred because of the code resetting clock frequency
to zero during resume.

This patch addresses the problem by:
- Preserving user-configured values in driver and sets the
clock frequency across resume
- Preserved settings are sent to the hardware during resume

Signed-off-by: mythilam <[e-mail]>
Acked-by: Alex Deucher <[e-mail]>
Reviewed-by: Yang Wang <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>
(cherry picked from commit 20ba98326f4c69e6bf8d1f42942ece485a675b27)

drivers/gpu/drm/amd/pm/swsmu/smu14/smu_v14_0.c

···
 			dev_err(smu->adev->dev, "Set soft max sclk failed!");
 			return ret;
 		}
+		if (smu->gfx_actual_hard_min_freq != smu->gfx_default_hard_min_freq ||
+		    smu->gfx_actual_soft_max_freq != smu->gfx_default_soft_max_freq)
+			smu->user_dpm_profile.user_od = true;
+		else
+			smu->user_dpm_profile.user_od = false;
 		break;
 	default:
 		return -ENOSYS;

drivers/gpu/drm/amd/pm/swsmu/smu14/smu_v14_0_0_ppt.c

···
 
 	smu->gfx_default_hard_min_freq = clk_table->MinGfxClk;
 	smu->gfx_default_soft_max_freq = clk_table->MaxGfxClk;
-	smu->gfx_actual_hard_min_freq = 0;
-	smu->gfx_actual_soft_max_freq = 0;
-
+	if (smu->gfx_actual_hard_min_freq == 0)
+		smu->gfx_actual_hard_min_freq = smu->gfx_default_hard_min_freq;
+	if (smu->gfx_actual_soft_max_freq == 0)
+		smu->gfx_actual_soft_max_freq = smu->gfx_default_soft_max_freq;
 	return 0;
 }
 
···
 
 	smu->gfx_default_hard_min_freq = clk_table->MinGfxClk;
 	smu->gfx_default_soft_max_freq = clk_table->MaxGfxClk;
-	smu->gfx_actual_hard_min_freq = 0;
-	smu->gfx_actual_soft_max_freq = 0;
+	if (smu->gfx_actual_hard_min_freq == 0)
+		smu->gfx_actual_hard_min_freq = smu->gfx_default_hard_min_freq;
+	if (smu->gfx_actual_soft_max_freq == 0)
+		smu->gfx_actual_soft_max_freq = smu->gfx_default_soft_max_freq;
 
 	return 0;
 }
···
 	return ret;
 }
 
+static int smu_v14_0_0_restore_user_od_settings(struct smu_context *smu)
+{
+	int ret;
+
+	ret = smu_cmn_send_smc_msg_with_param(smu, SMU_MSG_SetHardMinGfxClk,
+					      smu->gfx_actual_hard_min_freq,
+					      NULL);
+	if (ret) {
+		dev_err(smu->adev->dev, "Failed to restore hard min sclk!\n");
+		return ret;
+	}
+
+	ret = smu_cmn_send_smc_msg_with_param(smu, SMU_MSG_SetSoftMaxGfxClk,
+					      smu->gfx_actual_soft_max_freq,
+					      NULL);
+	if (ret) {
+		dev_err(smu->adev->dev, "Failed to restore soft max sclk!\n");
+		return ret;
+	}
+
+	return 0;
+}
+
 static const struct pptable_funcs smu_v14_0_0_ppt_funcs = {
 	.check_fw_status = smu_v14_0_check_fw_status,
 	.check_fw_version = smu_v14_0_check_fw_version,
···
 	.mode2_reset = smu_v14_0_0_mode2_reset,
 	.get_dpm_ultimate_freq = smu_v14_0_common_get_dpm_ultimate_freq,
 	.set_soft_freq_limited_range = smu_v14_0_0_set_soft_freq_limited_range,
+	.restore_user_od_settings = smu_v14_0_0_restore_user_od_settings,
 	.od_edit_dpm_table = smu_v14_0_od_edit_dpm_table,
 	.print_clk_levels = smu_v14_0_0_print_clk_levels,
 	.force_clk_levels = smu_v14_0_0_force_clk_levels,