cppc_set_epp - write energy performance preference register value, based on
ACPI 6.5, s8.4.6.1.7
cppc_get_auto_act_window - read autonomous activity window register value,
based on ACPI 6.5, s8.4.6.1.6
cppc_set_auto_act_window - write autonomous activity window register value,
based on ACPI 6.5, s8.4.6.1.6
Signed-off-by: Lifeng Zheng <zhenglifeng1@xxxxxxxxxx>
---
drivers/acpi/cppc_acpi.c | 80 ++++++++++++++++++++++++++++++++++++++++
include/acpi/cppc_acpi.h | 24 ++++++++++++
2 files changed, 104 insertions(+)
diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c
index e4c663000e40..a075eaa83d6c 100644
--- a/drivers/acpi/cppc_acpi.c
+++ b/drivers/acpi/cppc_acpi.c
@@ -1607,6 +1607,86 @@ int cppc_set_epp_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls, bool enable)
}
EXPORT_SYMBOL_GPL(cppc_set_epp_perf);
+/**
+ * cppc_set_epp() - Write the EPP register.
+ * @cpu: CPU on which to write register.
+ * @epp_val: Value to write to the EPP register.
+ */
+int cppc_set_epp(int cpu, u64 epp_val)
+{
+ if (epp_val > CPPC_ENERGY_PERF_MAX)
+ return -EINVAL;
+
+ return cppc_set_reg_val(cpu, ENERGY_PERF, epp_val);
+}
+EXPORT_SYMBOL_GPL(cppc_set_epp);
+
+/**
+ * cppc_get_auto_act_window() - Read autonomous activity window register.
+ * @cpu: CPU from which to read register.
+ * @auto_act_window: Return address.
+ *
+ * According to ACPI 6.5, s8.4.6.1.6, the value read from the autonomous
+ * activity window register consists of two parts: a 7 bits value indicate
+ * significand and a 3 bits value indicate exponent.
+ */
+int cppc_get_auto_act_window(int cpu, u64 *auto_act_window)
+{
+ unsigned int exp;
+ u64 val, sig;
+ int ret;
+
+ ret = cppc_get_reg_val(cpu, AUTO_ACT_WINDOW, &val);
+ if (ret)
+ return ret;
+
+ sig = val & CPPC_AUTO_ACT_WINDOW_MAX_SIG;
+ exp = (val >> CPPC_AUTO_ACT_WINDOW_SIG_BIT_SIZE) & CPPC_AUTO_ACT_WINDOW_MAX_EXP;
+ *auto_act_window = sig * int_pow(10, exp);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(cppc_get_auto_act_window);
+
+/**
+ * cppc_set_auto_act_window() - Write autonomous activity window register.
+ * @cpu: CPU on which to write register.
+ * @auto_act_window: usec value to write to the autonomous activity window register.
+ *
+ * According to ACPI 6.5, s8.4.6.1.6, the value to write to the autonomous
+ * activity window register consists of two parts: a 7 bits value indicate
+ * significand and a 3 bits value indicate exponent.
+ */
+int cppc_set_auto_act_window(int cpu, u64 auto_act_window)
+{
+ /* The max value to stroe is 1270000000 */
+ u64 max_val = CPPC_AUTO_ACT_WINDOW_MAX_SIG * int_pow(10, CPPC_AUTO_ACT_WINDOW_MAX_EXP);
+ int exp = 0;
+ u64 val;
+
+ if (auto_act_window > max_val)
+ return -EINVAL;
+
+ /*
+ * The max significand is 127, when auto_act_window is larger than
+ * 129, discard the precision of the last digit and increase the
+ * exponent by 1.
+ */
+ while (auto_act_window > CPPC_AUTO_ACT_WINDOW_SIG_CARRY_THRESH) {
+ auto_act_window /= 10;
+ exp += 1;
+ }
+
+ /* For 128 and 129, cut it to 127. */
+ if (auto_act_window > CPPC_AUTO_ACT_WINDOW_MAX_SIG)
+ auto_act_window = CPPC_AUTO_ACT_WINDOW_MAX_SIG;
+
+ val = (exp << CPPC_AUTO_ACT_WINDOW_SIG_BIT_SIZE) + auto_act_window;
+
+ return cppc_set_reg_val(cpu, AUTO_ACT_WINDOW, val);
+}
+EXPORT_SYMBOL_GPL(cppc_set_auto_act_window);
+
/**
* cppc_get_auto_sel() - Read autonomous selection register.
* @cpu: CPU from which to read register.
diff --git a/include/acpi/cppc_acpi.h b/include/acpi/cppc_acpi.h
index 31767c65be20..325e9543e08f 100644
--- a/include/acpi/cppc_acpi.h
+++ b/include/acpi/cppc_acpi.h
@@ -32,6 +32,15 @@
#define CMD_READ 0
#define CMD_WRITE 1
+#define CPPC_AUTO_ACT_WINDOW_SIG_BIT_SIZE (7)
+#define CPPC_AUTO_ACT_WINDOW_EXP_BIT_SIZE (3)
+#define CPPC_AUTO_ACT_WINDOW_MAX_SIG ((1 << CPPC_AUTO_ACT_WINDOW_SIG_BIT_SIZE) - 1)
+#define CPPC_AUTO_ACT_WINDOW_MAX_EXP ((1 << CPPC_AUTO_ACT_WINDOW_EXP_BIT_SIZE) - 1)
+/* CPPC_AUTO_ACT_WINDOW_MAX_SIG is 127, so 128 and 129 will decay to 127 when writing */
+#define CPPC_AUTO_ACT_WINDOW_SIG_CARRY_THRESH 129
+
+#define CPPC_ENERGY_PERF_MAX (0xFF)
+
/* Each register has the folowing format. */
struct cpc_reg {
u8 descriptor;
@@ -159,6 +168,9 @@ extern int cpc_read_ffh(int cpunum, struct cpc_reg *reg, u64 *val);
extern int cpc_write_ffh(int cpunum, struct cpc_reg *reg, u64 val);
extern int cppc_get_epp_perf(int cpunum, u64 *epp_perf);
extern int cppc_set_epp_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls, bool enable);
+extern int cppc_set_epp(int cpu, u64 epp_val);
+extern int cppc_get_auto_act_window(int cpu, u64 *auto_act_window);
+extern int cppc_set_auto_act_window(int cpu, u64 auto_act_window);
extern int cppc_get_auto_sel(int cpu, bool *enable);
extern int cppc_set_auto_sel(int cpu, bool enable);
extern int amd_get_highest_perf(unsigned int cpu, u32 *highest_perf);
@@ -229,6 +241,18 @@ static inline int cppc_get_epp_perf(int cpunum, u64 *epp_perf)
{
return -EOPNOTSUPP;
}
+static inline int cppc_set_epp(int cpu, u64 epp_val)
+{
+ return -EOPNOTSUPP;
+}
+static inline int cppc_get_auto_act_window(int cpu, u64 *auto_act_window)
+{
+ return -EOPNOTSUPP;
+}
+static inline int cppc_set_auto_act_window(int cpu, u64 auto_act_window)
+{
+ return -EOPNOTSUPP;
+}
static inline int cppc_get_auto_sel(int cpu, bool *enable)
{
return -EOPNOTSUPP;
--
2.33.0
