Re: [RFC 4/7] soc: qcom: Utilize qcom scmi vendor protocol for bus dvfs

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On 1/18/24 01:58, Konrad Dybcio wrote:


On 1/17/24 18:34, Sibi Sankar wrote:
From: Shivnandan Kumar <quic_kshivnan@xxxxxxxxxxx>

This patch introduces a client driver that interacts with the SCMI QCOM
vendor protocol and passes on the required tuneables to start various
features running on the SCMI controller.

Signed-off-by: Shivnandan Kumar <quic_kshivnan@xxxxxxxxxxx>
Co-developed-by: Ramakrishna Gottimukkula <quic_rgottimu@xxxxxxxxxxx>
Signed-off-by: Ramakrishna Gottimukkula <quic_rgottimu@xxxxxxxxxxx>
Co-developed-by: Amir Vajid <avajid@xxxxxxxxxxx>
Signed-off-by: Amir Vajid <avajid@xxxxxxxxxxx>
Co-developed-by: Sibi Sankar <quic_sibis@xxxxxxxxxxx>
Signed-off-by: Sibi Sankar <quic_sibis@xxxxxxxxxxx>
---

[...]


+
+struct cpufreq_memfreq_map {
+    unsigned int            cpufreq_mhz;
+    unsigned int            memfreq_khz;
+};

Weird use of tabs

will fix it in the next re-spin.


[...]

+static int get_mask(struct device_node *np, u32 *mask)
+{
+    struct device_node *dev_phandle;
+    struct device *cpu_dev;
+    int cpu, i = 0;
+    int ret = -ENODEV;

Don't initialize ret here, return 0 instead of breaking and return
enodev otherwise.

ack


+
+    dev_phandle = of_parse_phandle(np, "qcom,cpulist", i++);
+    while (dev_phandle) {
+        for_each_possible_cpu(cpu) {
+            cpu_dev = get_cpu_device(cpu);
+            if (cpu_dev && cpu_dev->of_node == dev_phandle) {
+                *mask |= BIT(cpu);
+                ret = 0;
+                break;
+            }
+        }

of_cpu_node_to_id()

ack


+        dev_phandle = of_parse_phandle(np, "qcom,cpulist", i++);
+    }
+
+    return ret;
+}


+
+static struct cpufreq_memfreq_map *init_cpufreq_memfreq_map(struct device *dev,
+                                struct device_node *of_node,
+                                u32 *cnt)

I really feel like this is trying to reinvent OPP..

if you structure your entries like so:

opp-0 {
     opp-hz = /bits/ 64 <12341234 43214321>;
};

you'll be able to use all the fantastic APIs that have been
created over the years!

I didn't know listing multiple frequencies in a opp was allowed. We can
probably get away with it here since we just parse the data here and not
populate data in the opp core.


[...]

+            monitor->mon_type = (of_property_read_bool(monitor_np, "qcom,compute-mon")) ? 1 : 0; +            monitor->ipm_ceil = (of_property_read_bool(monitor_np, "qcom,compute-mon")) ? 0 : 20000000;

What does it even mean for a monitor to be a compute mon?


When a monitor is marked compute-mon it means that the table is
followed religiously irrespective whether the instruction per miss
count threshold (ipm) is exceeded or not. Equivalent to having
a cpufreq map -> l3/DDR bw mapping upstream.

There seem to be no dt-bindings for properties referenced in this
driver, neither in the series nor in the dependencies. This is
strictly required.

Ack

Thanks again for reviewing the series. :)

-Sibi


Konrad




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