Hi Tanyia,
On Thu, Jan 17, 2019 at 04:29:58PM +0530, Taniya Das wrote:
Add support to read the voltage look up table and populate OPP for all
corresponding CPUS for consumers like the energy model could use the
frequency and voltage from the OPP tables. Also update the logic to not add
duplicate OPPs.
Tested-by: Matthias Kaehlcke <mka@xxxxxxxxxxxx>
Signed-off-by: Matthias Kaehlcke <mka@xxxxxxxxxxxx>
Signed-off-by: Taniya Das <tdas@xxxxxxxxxxxxxx>
---
drivers/cpufreq/qcom-cpufreq-hw.c | 41 ++++++++++++++++++++++++++++++++-------
1 file changed, 34 insertions(+), 7 deletions(-)
diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c b/drivers/cpufreq/qcom-cpufreq-hw.c
index d83939a..e006938 100644
--- a/drivers/cpufreq/qcom-cpufreq-hw.c
+++ b/drivers/cpufreq/qcom-cpufreq-hw.c
@@ -10,18 +10,21 @@
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
+#include <linux/pm_opp.h>
#include <linux/slab.h>
#define LUT_MAX_ENTRIES 40U
#define LUT_SRC GENMASK(31, 30)
#define LUT_L_VAL GENMASK(7, 0)
#define LUT_CORE_COUNT GENMASK(18, 16)
+#define LUT_VOLT GENMASK(11, 0)
#define LUT_ROW_SIZE 32
#define CLK_HW_DIV 2
/* Register offsets */
#define REG_ENABLE 0x0
-#define REG_LUT_TABLE 0x110
+#define REG_FREQ_LUT 0x110
+#define REG_VOLT_LUT 0x114
#define REG_PERF_STATE 0x920
static unsigned long cpu_hw_rate, xo_rate;
@@ -70,11 +73,12 @@ static unsigned int qcom_cpufreq_hw_fast_switch(struct cpufreq_policy *policy,
return policy->freq_table[index].frequency;
}
-static int qcom_cpufreq_hw_read_lut(struct device *dev,
+static int qcom_cpufreq_hw_read_lut(struct device *cpu_dev,
struct cpufreq_policy *policy,
void __iomem *base)
{
u32 data, src, lval, i, core_count, prev_cc = 0, prev_freq = 0, freq;
+ u32 volt;
unsigned int max_cores = cpumask_weight(policy->cpus);
struct cpufreq_frequency_table *table;
@@ -83,22 +87,27 @@ static int qcom_cpufreq_hw_read_lut(struct device *dev,
return -ENOMEM;
for (i = 0; i < LUT_MAX_ENTRIES; i++) {
- data = readl_relaxed(base + REG_LUT_TABLE + i * LUT_ROW_SIZE);
+ data = readl_relaxed(base + REG_FREQ_LUT +
+ i * LUT_ROW_SIZE);
src = FIELD_GET(LUT_SRC, data);
lval = FIELD_GET(LUT_L_VAL, data);
core_count = FIELD_GET(LUT_CORE_COUNT, data);
+ data = readl_relaxed(base + REG_VOLT_LUT +
+ i * LUT_ROW_SIZE);
+ volt = FIELD_GET(LUT_VOLT, data) * 1000;
+
if (src)
freq = xo_rate * lval / 1000;
else
freq = cpu_hw_rate / 1000;
- /* Ignore boosts in the middle of the table */
- if (core_count != max_cores) {
+ if (freq != prev_freq && core_count == max_cores) {
table[i].frequency = CPUFREQ_ENTRY_INVALID;
} else {
table[i].frequency = freq;
- dev_dbg(dev, "index=%d freq=%d, core_count %d\n", i,
+ dev_pm_opp_add(cpu_dev, freq * 1000, volt);
+ dev_dbg(cpu_dev, "index=%d freq=%d, core_count %d\n", i,
freq, core_count);
}
This marks normal entries as invalid and tries to add (potential)
boost frequencies to the OPP table. Note that the patch I posted on
https://lore.kernel.org/patchwork/patch/1030239/#1218724 does not only
change the condition, but also the order of the 'if' and 'else'
branches.
@@ -116,6 +125,7 @@ static int qcom_cpufreq_hw_read_lut(struct device *dev,
if (prev_cc != max_cores) {
prev->frequency = prev_freq;
prev->flags = CPUFREQ_BOOST_FREQ;
+ dev_pm_opp_add(cpu_dev, prev_freq * 1000, volt);
}
break;
@@ -127,6 +137,7 @@ static int qcom_cpufreq_hw_read_lut(struct device *dev,
table[i].frequency = CPUFREQ_TABLE_END;
policy->freq_table = table;
+ dev_pm_opp_set_sharing_cpus(cpu_dev, policy->cpus);
return 0;
}
@@ -159,10 +170,18 @@ static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy)
struct device *dev = &global_pdev->dev;
struct of_phandle_args args;
struct device_node *cpu_np;
+ struct device *cpu_dev;
struct resource *res;
void __iomem *base;
int ret, index;
+ cpu_dev = get_cpu_device(policy->cpu);
+ if (!cpu_dev) {
+ pr_err("%s: failed to get cpu%d device\n", __func__,
+ policy->cpu);
+ return -ENODEV;
+ }
+
cpu_np = of_cpu_device_node_get(policy->cpu);
if (!cpu_np)
return -EINVAL;
@@ -199,12 +218,18 @@ static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy)
policy->driver_data = base + REG_PERF_STATE;
- ret = qcom_cpufreq_hw_read_lut(dev, policy, base);
+ ret = qcom_cpufreq_hw_read_lut(cpu_dev, policy, base);
if (ret) {
dev_err(dev, "Domain-%d failed to read LUT\n", index);
goto error;
}
+ ret = dev_pm_opp_get_opp_count(cpu_dev);
+ if (ret <= 0) {
+ dev_err(cpu_dev, "Failed to add OPPs\n");
+ goto error;
This will return 0 (success) if the OPP count is zero, which probably
is not intended.
Cheers
Matthias
