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platform/x86/intel-uncore-freq: Handle autonomous UFS status bit

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When the AUTONOMOUS_UFS_DISABLED bit is set in the header, the ELC
(Efficiency Latency Control) feature is non-functional. Hence, return
error for read or write to ELC attributes.

Fixes: bb516dc79c ("platform/x86/intel-uncore-freq: Add support for efficiency latency control")
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260325192909.3417322-1-srinivas.pandruvada@linux.intel.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
This commit is contained in:
Srinivas Pandruvada
2026-03-25 12:29:09 -07:00
committed by Ilpo Järvinen
parent e1415b9418
commit 4ab604b3f3
1 changed files with 7 additions and 1 deletions
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8
drivers/platform/x86/intel/uncore-frequency/uncore-frequency-tpmi.c
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@@ -537,6 +537,7 @@ static void set_cdie_id(int domain_id, struct tpmi_uncore_cluster_info *cluster_
#define UNCORE_VERSION_MASK GENMASK_ULL(7, 0)
#define UNCORE_LOCAL_FABRIC_CLUSTER_ID_MASK GENMASK_ULL(15, 8)
#define UNCORE_CLUSTER_OFF_MASK GENMASK_ULL(7, 0)
#define UNCORE_AUTONOMOUS_UFS_DISABLED BIT(32)
#define UNCORE_MAX_CLUSTER_PER_DOMAIN 8
static int uncore_probe(struct auxiliary_device *auxdev, const struct auxiliary_device_id *id)
@@ -598,6 +599,7 @@ static int uncore_probe(struct auxiliary_device *auxdev, const struct auxiliary_
for (i = 0; i < num_resources; ++i) {
struct tpmi_uncore_power_domain_info *pd_info;
bool auto_ufs_enabled;
struct resource *res;
u64 cluster_offset;
u8 cluster_mask;
@@ -647,6 +649,8 @@ static int uncore_probe(struct auxiliary_device *auxdev, const struct auxiliary_
continue;
}
auto_ufs_enabled = !(header & UNCORE_AUTONOMOUS_UFS_DISABLED);
/* Find out number of clusters in this resource */
pd_info->cluster_count = hweight8(cluster_mask);
@@ -689,7 +693,9 @@ static int uncore_probe(struct auxiliary_device *auxdev, const struct auxiliary_
cluster_info->uncore_root = tpmi_uncore;
if (TPMI_MINOR_VERSION(pd_info->ufs_header_ver) >= UNCORE_ELC_SUPPORTED_VERSION)
if ((TPMI_MINOR_VERSION(pd_info->ufs_header_ver) >=
UNCORE_ELC_SUPPORTED_VERSION) &&
auto_ufs_enabled)
cluster_info->elc_supported = true;
ret = uncore_freq_add_entry(&cluster_info->uncore_data, 0);