linux-kernel - [PATCH v4 9/9] acpi: Remove acpi_hwp_native_thermal_lvt

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Date:   Mon, 10 Jul 2023 17:03:37 +0300
From:   Michal Wilczynski <michal.wilczynski@...el.com>
To:     linux-acpi@...r.kernel.org
Cc:     rafael@...nel.org, andriy.shevchenko@...el.com,
        artem.bityutskiy@...ux.intel.com, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, hpa@...or.com, lenb@...nel.org,
        jgross@...e.com, linux-kernel@...r.kernel.org, x86@...nel.org,
        Michal Wilczynski <michal.wilczynski@...el.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v4 9/9] acpi: Remove acpi_hwp_native_thermal_lvt_osc()

Workaround for buggy skylake BIOS is implemented in acpi_processor_osc()
and acpi_hwp_native_thermal_lvt_osc() function is not called anywhere.
Remove it.

Suggested-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Michal Wilczynski <michal.wilczynski@...el.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/acpi/acpi_processor.c | 36 -----------------------------------
 1 file changed, 36 deletions(-)

diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c
index 50c456dbecea..a1815155543a 100644
--- a/drivers/acpi/acpi_processor.c
+++ b/drivers/acpi/acpi_processor.c
@@ -561,7 +561,6 @@ bool __init processor_physically_present(acpi_handle handle)
 
 /* vendor specific UUID indicating an Intel platform */
 static u8 sb_uuid_str[] = "4077A616-290C-47BE-9EBD-D87058713953";
-static bool acpi_hwp_native_thermal_lvt_set;
 static acpi_status __init acpi_processor_osc(acpi_handle handle, u32 lvl,
 					     void *context, void **rv)
 {
@@ -588,41 +587,6 @@ static acpi_status __init acpi_processor_osc(acpi_handle handle, u32 lvl,
 	return AE_OK;
 }
 
-static acpi_status __init acpi_hwp_native_thermal_lvt_osc(acpi_handle handle,
-							  u32 lvl,
-							  void *context,
-							  void **rv)
-{
-	u32 capbuf[2];
-	struct acpi_osc_context osc_context = {
-		.uuid_str = sb_uuid_str,
-		.rev = 1,
-		.cap.length = 8,
-		.cap.pointer = capbuf,
-	};
-
-	if (acpi_hwp_native_thermal_lvt_set)
-		return AE_CTRL_TERMINATE;
-
-	capbuf[0] = 0x0000;
-	capbuf[1] = 0x1000; /* set bit 12 */
-
-	if (ACPI_SUCCESS(acpi_run_osc(handle, &osc_context))) {
-		if (osc_context.ret.pointer && osc_context.ret.length > 1) {
-			u32 *capbuf_ret = osc_context.ret.pointer;
-
-			if (capbuf_ret[1] & 0x1000) {
-				acpi_handle_info(handle,
-					"_OSC native thermal LVT Acked\n");
-				acpi_hwp_native_thermal_lvt_set = true;
-			}
-		}
-		kfree(osc_context.ret.pointer);
-	}
-
-	return AE_OK;
-}
-
 acpi_status __init acpi_early_processor_osc(void)
 {
 	acpi_status status;
-- 
2.41.0