[PATCH 6.12 074/113] platform/x86: intel_telemetry: Fix PSS event register mask

Greg Kroah-Hartman
2026-02-09T14:39:01Z

From: Kaushlendra Kumar <kaushlendra.kumar@intel.com>

[ Upstream commit 39e9c376ac42705af4ed4ae39eec028e8bced9b4 ]

The PSS telemetry info parsing incorrectly applies
TELEM_INFO_SRAMEVTS_MASK when extracting event register
count from firmware response. This reads bits 15-8 instead
of the correct bits 7-0, causing misdetection of hardware
capabilities.

The IOSS path correctly uses TELEM_INFO_NENABLES_MASK for
register count. Apply the same mask to PSS parsing for
consistency.

Fixes: 9d16b482b059 ("platform:x86: Add Intel telemetry platform driver")
Signed-off-by: Kaushlendra Kumar <kaushlendra.kumar@intel.com>
Link: https://patch.msgid.link/20251224061144.3925519-1-kaushlendra.kumar@intel.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/platform/x86/intel/telemetry/pltdrv.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/platform/x86/intel/telemetry/pltdrv.c b/drivers/platform/x86/intel/telemetry/pltdrv.c
index 767a0bc6c7ad5..29991bc80dada 100644
--- a/drivers/platform/x86/intel/telemetry/pltdrv.c
+++ b/drivers/platform/x86/intel/telemetry/pltdrv.c
@@ -610,7 +610,7 @@ static int telemetry_setup(struct platform_device *pdev)
/* Get telemetry Info */
events = (read_buf & TELEM_INFO_SRAMEVTS_MASK) >>
TELEM_INFO_SRAMEVTS_SHIFT;
- event_regs = read_buf & TELEM_INFO_SRAMEVTS_MASK;
+ event_regs = read_buf & TELEM_INFO_NENABLES_MASK;
if ((events < TELEM_MAX_EVENTS_SRAM) ||
(event_regs < TELEM_MAX_EVENTS_SRAM)) {
dev_err(&pdev->dev, "PSS:Insufficient Space for SRAM Trace\n");
--
2.51.0