[PATCH 5.10 24/41] platform/x86: intel_telemetry: Fix PSS event register mask

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

5.10-stable review patch.  If anyone has any objections, please let me know.

------------------

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 405dea87de6bf..dd1ee2730b6a6 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