msm: kgsl: Create sysfs entry to control GPU NAP state

Create sysfs entry to have option to disable software clockgating
NAP state.

CRs-Fixed: 973565
Change-Id: I2376f10161040dbf426887ce146ac597f401153f
Signed-off-by: Oleg Perelet <operelet@codeaurora.org>

diff --git a/drivers/gpu/msm/kgsl_pwrctrl.c b/drivers/gpu/msm/kgsl_pwrctrl.c
index 08f7b29..15c10ad 100644 (file)
--- a/drivers/gpu/msm/kgsl_pwrctrl.c
+++ b/drivers/gpu/msm/kgsl_pwrctrl.c
@@ -32,6 +32,7 @@
 #define KGSL_PWRFLAGS_AXI_ON   2
 #define KGSL_PWRFLAGS_IRQ_ON   3
 #define KGSL_PWRFLAGS_RETENTION_ON  4
+#define KGSL_PWRFLAGS_NAP_OFF  5
 
 #define UPDATE_BUSY_VAL                1000000
 
@@ -1053,6 +1054,21 @@ static ssize_t kgsl_pwrctrl_force_non_retention_on_store(struct device *dev,
                                        KGSL_PWRFLAGS_RETENTION_ON);
 }
 
+static ssize_t kgsl_pwrctrl_force_no_nap_show(struct device *dev,
+                                       struct device_attribute *attr,
+                                       char *buf)
+{
+       return __force_on_show(dev, attr, buf, KGSL_PWRFLAGS_NAP_OFF);
+}
+
+static ssize_t kgsl_pwrctrl_force_no_nap_store(struct device *dev,
+                                       struct device_attribute *attr,
+                                       const char *buf, size_t count)
+{
+       return __force_on_store(dev, attr, buf, count,
+                                       KGSL_PWRFLAGS_NAP_OFF);
+}
+
 static ssize_t kgsl_pwrctrl_bus_split_show(struct device *dev,
                                        struct device_attribute *attr,
                                        char *buf)
@@ -1217,6 +1233,9 @@ static DEVICE_ATTR(popp, 0644, kgsl_popp_show, kgsl_popp_store);
 static DEVICE_ATTR(force_non_retention_on, 0644,
        kgsl_pwrctrl_force_non_retention_on_show,
        kgsl_pwrctrl_force_non_retention_on_store);
+static DEVICE_ATTR(force_no_nap, 0644,
+       kgsl_pwrctrl_force_no_nap_show,
+       kgsl_pwrctrl_force_no_nap_store);
 
 static const struct device_attribute *pwrctrl_attr_list[] = {
        &dev_attr_gpuclk,
@@ -1235,6 +1254,7 @@ static const struct device_attribute *pwrctrl_attr_list[] = {
        &dev_attr_force_bus_on,
        &dev_attr_force_rail_on,
        &dev_attr_force_non_retention_on,
+       &dev_attr_force_no_nap,
        &dev_attr_bus_split,
        &dev_attr_default_pwrlevel,
        &dev_attr_popp,
@@ -2549,7 +2569,9 @@ void kgsl_active_count_put(struct kgsl_device *device)
        BUG_ON(atomic_read(&device->active_cnt) == 0);
 
        if (atomic_dec_and_test(&device->active_cnt)) {
-               if (device->state == KGSL_STATE_ACTIVE &&
+               bool nap_on = !(device->pwrctrl.ctrl_flags &
+                       BIT(KGSL_PWRFLAGS_NAP_OFF));
+               if (nap_on && device->state == KGSL_STATE_ACTIVE &&
                        device->requested_state == KGSL_STATE_NONE) {
                        kgsl_pwrctrl_request_state(device, KGSL_STATE_NAP);
                        kgsl_schedule_work(&device->idle_check_ws);