linux-kernel - [PATCH v2 3/3] platform/x86: ISST: Use only TPMI interface when present

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Message-ID: <20240531083554.1313110-4-srinivas.pandruvada@linux.intel.com>
Date: Fri, 31 May 2024 01:35:48 -0700
From: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To: hdegoede@...hat.com,
	ilpo.jarvinen@...ux.intel.com
Cc: platform-driver-x86@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	andriy.shevchenko@...ux.intel.com,
	rui.zhang@...el.com,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Subject: [PATCH v2 3/3] platform/x86: ISST: Use only TPMI interface when present

When the TPMI interface is present, use this interface instead of legacy.
On some systems legacy IO device is also present. Using both interfaces
together is confusing and may set the hardware in inconsistent state.

When TPMI interface is present, don't load legacy drivers.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Reviewed-by: Zhang Rui <rui.zhang@...el.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
---
Previously 2/2, now 3/3
No change except reviewed-by Ilpo.

 drivers/platform/x86/intel/speed_select_if/isst_if_common.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/platform/x86/intel/speed_select_if/isst_if_common.c b/drivers/platform/x86/intel/speed_select_if/isst_if_common.c
index 7ea058571ab5..10e21563fa46 100644
--- a/drivers/platform/x86/intel/speed_select_if/isst_if_common.c
+++ b/drivers/platform/x86/intel/speed_select_if/isst_if_common.c
@@ -775,6 +775,9 @@ int isst_if_cdev_register(int device_type, struct isst_if_cmd_cb *cb)
 	if (device_type >= ISST_IF_DEV_MAX)
 		return -EINVAL;
 
+	if (device_type < ISST_IF_DEV_TPMI && isst_hpm_support)
+		return -ENODEV;
+
 	mutex_lock(&punit_misc_dev_open_lock);
 	/* Device is already open, we don't want to add new callbacks */
 	if (misc_device_open) {
-- 
2.40.1