google/patches/grace-platform/0001-cppc_cpufreq-Remove-HiSilicon-CPPC-workaround.patch

From 07181320df241b03c4b83113dd89b08985034d83 Mon Sep 17 00:00:00 2001
From: Jie Zhan <zhanjie9@hisilicon.com>
Date: Sun, 29 Sep 2024 11:32:14 +0800
Subject: [PATCH 1/3] cppc_cpufreq: Remove HiSilicon CPPC workaround

Since commit 6c8d750f9784 ("cpufreq / cppc: Work around for Hisilicon CPPC
cpufreq"), we introduce a workround for HiSilicon platforms that do not
support performance feedback counters, whereas they can get the actual
frequency from the desired perf register.  Later on, FIE is disabled in
that workaround as well.

Now the workround can be handled by the common code.  Desired perf would be
read and converted to frequency if feedback counters don't change.  FIE
would be disabled if the CPPC regs are in PCC region.

Hence, the workaround is no longer needed and can be safely removed, in an
effort to consolidate the driver procedure.

Signed-off-by: Jie Zhan <zhanjie9@hisilicon.com>
Reviewed-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Reviewed-by: Huisong Li <lihuisong@huawei.com>
[ Viresh: Move fie_disabled withing CONFIG option to fix warning ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
---
 drivers/cpufreq/cppc_cpufreq.c | 73 +---------------------------------
 1 file changed, 1 insertion(+), 72 deletions(-)

diff --git a/drivers/cpufreq/cppc_cpufreq.c b/drivers/cpufreq/cppc_cpufreq.c
index 36ea181260c7..ca314b764675 100644
--- a/drivers/cpufreq/cppc_cpufreq.c
+++ b/drivers/cpufreq/cppc_cpufreq.c
@@ -36,33 +36,15 @@ static LIST_HEAD(cpu_data_list);
 
 static bool boost_supported;
 
-struct cppc_workaround_oem_info {
-	char oem_id[ACPI_OEM_ID_SIZE + 1];
-	char oem_table_id[ACPI_OEM_TABLE_ID_SIZE + 1];
-	u32 oem_revision;
-};
-
-static struct cppc_workaround_oem_info wa_info[] = {
-	{
-		.oem_id		= "HISI  ",
-		.oem_table_id	= "HIP07   ",
-		.oem_revision	= 0,
-	}, {
-		.oem_id		= "HISI  ",
-		.oem_table_id	= "HIP08   ",
-		.oem_revision	= 0,
-	}
-};
-
 static struct cpufreq_driver cppc_cpufreq_driver;
 
+#ifdef CONFIG_ACPI_CPPC_CPUFREQ_FIE
 static enum {
 	FIE_UNSET = -1,
 	FIE_ENABLED,
 	FIE_DISABLED
 } fie_disabled = FIE_UNSET;
 
-#ifdef CONFIG_ACPI_CPPC_CPUFREQ_FIE
 module_param(fie_disabled, int, 0444);
 MODULE_PARM_DESC(fie_disabled, "Disable Frequency Invariance Engine (FIE)");
 
@@ -78,7 +60,6 @@ struct cppc_freq_invariance {
 static DEFINE_PER_CPU(struct cppc_freq_invariance, cppc_freq_inv);
 static struct kthread_worker *kworker_fie;
 
-static unsigned int hisi_cppc_cpufreq_get_rate(unsigned int cpu);
 static int cppc_perf_from_fbctrs(struct cppc_cpudata *cpu_data,
 				 struct cppc_perf_fb_ctrs *fb_ctrs_t0,
 				 struct cppc_perf_fb_ctrs *fb_ctrs_t1);
@@ -853,57 +834,6 @@ static struct cpufreq_driver cppc_cpufreq_driver = {
 	.name = "cppc_cpufreq",
 };
 
-/*
- * HISI platform does not support delivered performance counter and
- * reference performance counter. It can calculate the performance using the
- * platform specific mechanism. We reuse the desired performance register to
- * store the real performance calculated by the platform.
- */
-static unsigned int hisi_cppc_cpufreq_get_rate(unsigned int cpu)
-{
-	struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
-	struct cppc_cpudata *cpu_data;
-	u64 desired_perf;
-	int ret;
-
-	if (!policy)
-		return -ENODEV;
-
-	cpu_data = policy->driver_data;
-
-	cpufreq_cpu_put(policy);
-
-	ret = cppc_get_desired_perf(cpu, &desired_perf);
-	if (ret < 0)
-		return -EIO;
-
-	return cppc_perf_to_khz(&cpu_data->perf_caps, desired_perf);
-}
-
-static void cppc_check_hisi_workaround(void)
-{
-	struct acpi_table_header *tbl;
-	acpi_status status = AE_OK;
-	int i;
-
-	status = acpi_get_table(ACPI_SIG_PCCT, 0, &tbl);
-	if (ACPI_FAILURE(status) || !tbl)
-		return;
-
-	for (i = 0; i < ARRAY_SIZE(wa_info); i++) {
-		if (!memcmp(wa_info[i].oem_id, tbl->oem_id, ACPI_OEM_ID_SIZE) &&
-		    !memcmp(wa_info[i].oem_table_id, tbl->oem_table_id, ACPI_OEM_TABLE_ID_SIZE) &&
-		    wa_info[i].oem_revision == tbl->oem_revision) {
-			/* Overwrite the get() callback */
-			cppc_cpufreq_driver.get = hisi_cppc_cpufreq_get_rate;
-			fie_disabled = FIE_DISABLED;
-			break;
-		}
-	}
-
-	acpi_put_table(tbl);
-}
-
 static int __init cppc_cpufreq_init(void)
 {
 	int ret;
@@ -911,7 +841,6 @@ static int __init cppc_cpufreq_init(void)
 	if (!acpi_cpc_valid())
 		return -ENODEV;
 
-	cppc_check_hisi_workaround();
 	cppc_freq_invariance_init();
 	populate_efficiency_class();
 
-- 
2.50.1.703.g449372360f-goog