linux-kernel - [PATCH v2] platform/x86: ISST: Optimize suspend/resume callbacks

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Message-ID: <20260107061649.1634737-1-srinivas.pandruvada@linux.intel.com>
Date: Tue,  6 Jan 2026 22:16:49 -0800
From: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To: hansg@...nel.org,
	ilpo.jarvinen@...ux.intel.com
Cc: platform-driver-x86@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Subject: [PATCH v2] platform/x86: ISST: Optimize suspend/resume callbacks

If SST-CP or SST-PP is not supported then don't store configuration
during suspend callback and restore during resume callback.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
---
This patch is dependent on series "
[PATCH v2 0/2] platform/x86: ISST: Fix for write lock and suspend/resume"

v2:
- Move bit definition to defines

 .../x86/intel/speed_select_if/isst_tpmi_core.c  | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/platform/x86/intel/speed_select_if/isst_tpmi_core.c b/drivers/platform/x86/intel/speed_select_if/isst_tpmi_core.c
index f71d7df03f35..9c078c8acb50 100644
--- a/drivers/platform/x86/intel/speed_select_if/isst_tpmi_core.c
+++ b/drivers/platform/x86/intel/speed_select_if/isst_tpmi_core.c
@@ -1721,6 +1721,9 @@ void tpmi_sst_dev_remove(struct auxiliary_device *auxdev)
 }
 EXPORT_SYMBOL_NS_GPL(tpmi_sst_dev_remove, "INTEL_TPMI_SST");
 
+#define SST_PP_CAP_CP_ENABLE	BIT(0)
+#define SST_PP_CAP_PP_ENABLE	BIT(1)
+
 void tpmi_sst_dev_suspend(struct auxiliary_device *auxdev)
 {
 	struct tpmi_sst_struct *tpmi_sst = auxiliary_get_drvdata(auxdev);
@@ -1741,6 +1744,9 @@ void tpmi_sst_dev_suspend(struct auxiliary_device *auxdev)
 		if (!pd_info || !pd_info->sst_base)
 			continue;
 
+		if (!(pd_info->sst_header.cap_mask & SST_PP_CAP_CP_ENABLE))
+			goto process_pp_suspend;
+
 		cp_base = pd_info->sst_base + pd_info->sst_header.cp_offset;
 		pd_info->saved_sst_cp_control = readq(cp_base + SST_CP_CONTROL_OFFSET);
 		memcpy_fromio(pd_info->saved_clos_configs, cp_base + SST_CLOS_CONFIG_0_OFFSET,
@@ -1748,6 +1754,10 @@ void tpmi_sst_dev_suspend(struct auxiliary_device *auxdev)
 		memcpy_fromio(pd_info->saved_clos_assocs, cp_base + SST_CLOS_ASSOC_0_OFFSET,
 			      sizeof(pd_info->saved_clos_assocs));
 
+process_pp_suspend:
+		if (!(pd_info->sst_header.cap_mask & SST_PP_CAP_PP_ENABLE))
+			continue;
+
 		pd_info->saved_pp_control = readq(pd_info->sst_base +
 						  pd_info->sst_header.pp_offset +
 						  SST_PP_CONTROL_OFFSET);
@@ -1775,6 +1785,9 @@ void tpmi_sst_dev_resume(struct auxiliary_device *auxdev)
 		if (!pd_info || !pd_info->sst_base)
 			continue;
 
+		if (!(pd_info->sst_header.cap_mask & SST_PP_CAP_CP_ENABLE))
+			goto process_pp_resume;
+
 		cp_base = pd_info->sst_base + pd_info->sst_header.cp_offset;
 		writeq(pd_info->saved_sst_cp_control, cp_base + SST_CP_CONTROL_OFFSET);
 		memcpy_toio(cp_base + SST_CLOS_CONFIG_0_OFFSET, pd_info->saved_clos_configs,
@@ -1782,6 +1795,10 @@ void tpmi_sst_dev_resume(struct auxiliary_device *auxdev)
 		memcpy_toio(cp_base + SST_CLOS_ASSOC_0_OFFSET, pd_info->saved_clos_assocs,
 			    sizeof(pd_info->saved_clos_assocs));
 
+process_pp_resume:
+		if (!(pd_info->sst_header.cap_mask & SST_PP_CAP_PP_ENABLE))
+			continue;
+
 		writeq(pd_info->saved_pp_control, power_domain_info->sst_base +
 		       pd_info->sst_header.pp_offset + SST_PP_CONTROL_OFFSET);
 	}
-- 
2.52.0