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authorLinus Torvalds <torvalds@linux-foundation.org>2019-05-15 08:46:44 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2019-05-15 08:46:44 -0700
commitbfbfbf7368627860dd769567599d73ad8f6d8191 (patch)
tree0db55522cfa41fa95fa236c7074753dfc6c7e2e8 /drivers/soc
parent88f76bc31b93cc228f5a43d5b565dc53615970ae (diff)
parent2a8d69f6139b605b2e36c80540cb8e8da2d016be (diff)
Merge tag 'pm-5.2-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull more power management updates from Rafael Wysocki: "These fix a recent regression causing kernels built with CONFIG_PM unset to crash on systems that support the Performance and Energy Bias Hint (EPB), clean up the cpufreq core and some users of transition notifiers and introduce a new power domain flag into the generic power domains framework (genpd). Specifics: - Fix recent regression causing kernels built with CONFIG_PM unset to crash on systems that support the Performance and Energy Bias Hint (EPB) by avoiding to compile the EPB-related code depending on CONFIG_PM when it is unset (Rafael Wysocki). - Clean up the transition notifier invocation code in the cpufreq core and change some users of cpufreq transition notifiers accordingly (Viresh Kumar). - Change MAINTAINERS to cover the schedutil governor as part of cpufreq (Viresh Kumar). - Simplify cpufreq_init_policy() to avoid redundant computations (Yue Hu). - Add explanatory comment to the cpufreq core (Rafael Wysocki). - Introduce a new flag, GENPD_FLAG_RPM_ALWAYS_ON, to the generic power domains (genpd) framework along with the first user of it (Leonard Crestez)" * tag 'pm-5.2-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: soc: imx: gpc: Use GENPD_FLAG_RPM_ALWAYS_ON for ERR009619 PM / Domains: Add GENPD_FLAG_RPM_ALWAYS_ON flag cpufreq: Update MAINTAINERS to include schedutil governor cpufreq: Don't find governor for setpolicy drivers in cpufreq_init_policy() cpufreq: Explain the kobject_put() in cpufreq_policy_alloc() cpufreq: Call transition notifier only once for each policy x86: intel_epb: Take CONFIG_PM into account
Diffstat (limited to 'drivers/soc')
-rw-r--r--drivers/soc/imx/gpc.c13
1 files changed, 11 insertions, 2 deletions
diff --git a/drivers/soc/imx/gpc.c b/drivers/soc/imx/gpc.c
index 7d14a4b4e82a..29b43651c261 100644
--- a/drivers/soc/imx/gpc.c
+++ b/drivers/soc/imx/gpc.c
@@ -431,10 +431,19 @@ static int imx_gpc_probe(struct platform_device *pdev)
return ret;
}
- /* Disable PU power down in normal operation if ERR009619 is present */
+ /*
+ * Disable PU power down by runtime PM if ERR009619 is present.
+ *
+ * The PRE clock will be paused for several cycles when turning on the
+ * PU domain LDO from power down state. If PRE is in use at that time,
+ * the IPU/PRG cannot get the correct display data from the PRE.
+ *
+ * This is not a concern when the whole system enters suspend state, so
+ * it's safe to power down PU in this case.
+ */
if (of_id_data->err009619_present)
imx_gpc_domains[GPC_PGC_DOMAIN_PU].base.flags |=
- GENPD_FLAG_ALWAYS_ON;
+ GENPD_FLAG_RPM_ALWAYS_ON;
/* Keep DISP always on if ERR006287 is present */
if (of_id_data->err006287_present)