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authorLeonard Crestez <leonard.crestez@nxp.com>2019-04-30 15:06:12 +0000
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2019-05-13 10:51:31 +0200
commit8d5d766f00726efd0abd2e7835b0e538fe4ad6e4 (patch)
tree075116346ac613427c243517359fa797c93dabe7 /drivers/soc/imx/gpc.c
parented61e18a4b4e445ae8622a4faec6a259601cc4a5 (diff)
soc: imx: gpc: Use GENPD_FLAG_RPM_ALWAYS_ON for ERR009619
This allows PU domain to be turned off in suspend and save power. Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/soc/imx/gpc.c')
-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)