msm: pm-8x60: Add SNOC request for faster warmboot
Keep a request of 100 Mhz for SNOC bus when Apps is active. This
improves the exit times from power collapse. Without this change the
trust zone code running in secure mode will be bus limited. The request
will be made one time during bootup, the bus request is active only meaning
when Apps does an RPM notified sleep RPM will remove the SNOC bus request
when transitioning to sleep.
Currently trust zone is not an RPM client so it cannot make this request,
even then it is ineffecient to constantly send RPM SMD messages especially
since standalone power collapse can happen in much greater frequency on
all cores in a multi core processor.
Change-Id: Ief9ccd6c803a9a22c8af350b63f568a33bafa94e
Signed-off-by: Girish Mahadevan <girishm@codeaurora.org>
diff --git a/arch/arm/mach-msm/pm-8x60.c b/arch/arm/mach-msm/pm-8x60.c
index 33ad83f..efbcbe7 100644
--- a/arch/arm/mach-msm/pm-8x60.c
+++ b/arch/arm/mach-msm/pm-8x60.c
@@ -36,6 +36,7 @@
#include <mach/scm.h>
#include <mach/socinfo.h>
#include <mach/msm-krait-l2-accessors.h>
+#include <mach/msm_bus.h>
#include <asm/cacheflush.h>
#include <asm/hardware/gic.h>
#include <asm/pgtable.h>
@@ -1110,6 +1111,36 @@
.enter = msm_pm_enter,
.valid = suspend_valid_only_mem,
};
+
+static int __devinit msm_pm_snoc_client_probe(struct platform_device *pdev)
+{
+ int rc = 0;
+ static struct msm_bus_scale_pdata *msm_pm_bus_pdata;
+ static uint32_t msm_pm_bus_client;
+
+ msm_pm_bus_pdata = msm_bus_cl_get_pdata(pdev);
+
+ if (msm_pm_bus_pdata) {
+ msm_pm_bus_client =
+ msm_bus_scale_register_client(msm_pm_bus_pdata);
+
+ if (!msm_pm_bus_client) {
+ pr_err("%s: Failed to register SNOC client",
+ __func__);
+ rc = -ENXIO;
+ goto snoc_cl_probe_done;
+ }
+
+ rc = msm_bus_scale_client_update_request(msm_pm_bus_client, 1);
+
+ if (rc)
+ pr_err("%s: Error setting bus rate", __func__);
+ }
+
+snoc_cl_probe_done:
+ return rc;
+}
+
static int __devinit msm_cpu_status_probe(struct platform_device *pdev)
{
struct msm_pm_sleep_status_data *pdata;
@@ -1198,6 +1229,21 @@
},
};
+static struct of_device_id msm_snoc_clnt_match_tbl[] = {
+ {.compatible = "qcom,pm-snoc-client"},
+ {},
+};
+
+static struct platform_driver msm_cpu_pm_snoc_client_driver = {
+ .probe = msm_pm_snoc_client_probe,
+ .driver = {
+ .name = "pm_snoc_client",
+ .owner = THIS_MODULE,
+ .of_match_table = msm_snoc_clnt_match_tbl,
+ },
+};
+
+
static int __init msm_pm_setup_saved_state(void)
{
pgd_t *pc_pgd;
@@ -1538,6 +1584,14 @@
return rc;
}
+ rc = platform_driver_register(&msm_cpu_pm_snoc_client_driver);
+
+ if (rc) {
+ pr_err("%s(): failed to register driver %s\n", __func__,
+ msm_cpu_pm_snoc_client_driver.driver.name);
+ return rc;
+ }
+
return platform_driver_register(&msm_pm_8x60_driver);
}
device_initcall(msm_pm_8x60_init);