Eric Lee / smarc-ti-linux-kernel

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Commit 62a041a4f58f32989460e37cb4f9aed5183f357f

Authored by Dmitry Torokhov
Committed by Rafael J. Wysocki
1 parent 437574c9cb
Exists in ti-lsk-linux-4.1.y and in 10 other branches dlt-processor-sdk-linux-03.00.00.04, processor-sdk-linux-02.00.01, smarc-ti-lsk-linux-4.1.y, smarct3x-processor-sdk-04.01.00.06, smarct3x-processor-sdk-linux-02.00.01, smarct3x-processor-sdk-linux-03.00.00.04, smarct4x-800-processor-sdk-linux-02.00.01, smarct4x-processor-sdk-04.01.00.06, smarct4x-processor-sdk-linux-02.00.01, smarct4x-processor-sdk-linux-03.00.00.04

cpufreq-dt: defer probing if OPP table is not ready 

cpufreq-dt driver supports mode when OPP table is provided by platform
code and not device tree. However on certain platforms code that fills
OPP table may run after cpufreq driver tries to initialize, so let's
report -EPROBE_DEFER if we do not find any entires in OPP table for the
CPU.

Signed-off-by: Dmitry Torokhov <dtor@chromium.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Showing 1 changed file with 11 additions and 0 deletions Side-by-side Diff

drivers/cpufreq/cpufreq-dt.c
Diff comments   View file @ 62a041a
... ... @@ -211,6 +211,17 @@
211 211 /* OPPs might be populated at runtime, don't check for error here */
212 212 of_init_opp_table(cpu_dev);
213 213  
  214 + /*
  215 + * But we need OPP table to function so if it is not there let's
  216 + * give platform code chance to provide it for us.
  217 + */
  218 + ret = dev_pm_opp_get_opp_count(cpu_dev);
  219 + if (ret <= 0) {
  220 + pr_debug("OPP table is not ready, deferring probe\n");
  221 + ret = -EPROBE_DEFER;
  222 + goto out_free_opp;
  223 + }
  224 +
214 225 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
215 226 if (!priv) {
216 227 ret = -ENOMEM;