msm: vidc: Apply a QOS vote when Venus is active

During video playback, L2 power collapse is occurring far too often to
actually save power.  As such, apply a vote to prevent L2 PC from
occurring.

Change-Id: I1d86b47a1ed9dffb02d099d3158892bf99ed955e
Signed-off-by: Deva Ramasubramanian <dramasub@codeaurora.org>
Signed-off-by: Vasantha Balla <vballa@codeaurora.org>

Documentation/devicetree/bindings/media/video/msm-vidc.txt

@@ -131,6 +131,8 @@ Optional properties:
   clock settings if video hardware requests to do so.
 - qcom,regulator-scaling = A bool indicating whether driver need to control
   voltage settings.
+- qcom,pm-qos-latency-us = The latency used to vote for QOS power manager. This
+value is typically max(latencies of every cluster at all power levels) + 1
 
 Example:
 

drivers/media/platform/msm/vidc/msm_vidc_res_parse.c

@@ -919,6 +919,10 @@ int read_platform_resources_from_dt(
 		dprintk(VIDC_DBG,
 				"Using fw-bias : %pa", &res->firmware_base);
 	}
+
+	of_property_read_u32(pdev->dev.of_node,
+			"qcom,pm-qos-latency-us", &res->pm_qos_latency_us);
+
 	return rc;
 err_load_max_hw_load:
 	msm_vidc_free_clock_voltage_table(res);

drivers/media/platform/msm/vidc/msm_vidc_resources.h

@@ -153,6 +153,7 @@ struct msm_vidc_platform_resources {
 	bool early_fw_load;
 	bool thermal_mitigable;
 	const char *fw_name;
+	uint32_t pm_qos_latency_us;
 };
 
 static inline int is_iommu_present(struct msm_vidc_platform_resources *res)

drivers/media/platform/msm/vidc/venus_hfi.c

@@ -19,6 +19,7 @@
 #include <linux/of.h>
 #include <linux/iommu.h>
 #include <linux/qcom_iommu.h>
+#include <linux/pm_qos.h>
 #include <linux/regulator/consumer.h>
 #include <linux/iopoll.h>
 #include <linux/coresight-stm.h>
@@ -1654,6 +1655,8 @@ static inline int venus_hfi_power_off(struct venus_hfi_device *device)
 	}
 
 	dprintk(VIDC_DBG, "Entering power collapse\n");
+
+	pm_qos_remove_request(&device->qos);
 	rc = venus_hfi_tzbsp_set_video_state(TZBSP_VIDEO_STATE_SUSPEND);
 	if (rc) {
 		dprintk(VIDC_WARN, "Failed to suspend video core %d\n", rc);
@@ -1797,6 +1800,9 @@ static inline int venus_hfi_power_on(struct venus_hfi_device *device)
 	}
 
 	device->power_enabled = true;
+	if(device->res->pm_qos_latency_us)
+		pm_qos_add_request(&device->qos, PM_QOS_CPU_DMA_LATENCY,
+					device->res->pm_qos_latency_us);
 
 	dprintk(VIDC_INFO, "Resumed from power collapse\n");
 	return rc;
@@ -2614,6 +2620,10 @@ static int venus_hfi_core_init(void *device)
 	if (rc || venus_hfi_iface_cmdq_write(dev, &version_pkt))
 		dprintk(VIDC_WARN, "Failed to send image version pkt to f/w\n");
 
+	if (dev->res->pm_qos_latency_us)
+		pm_qos_add_request(&dev->qos, PM_QOS_CPU_DMA_LATENCY,
+				dev->res->pm_qos_latency_us);
+
 	return rc;
 err_core_init:
 	venus_hfi_set_state(dev, VENUS_STATE_DEINIT);
@@ -2658,6 +2668,8 @@ static int venus_hfi_core_release(void *device)
 			disable_irq_nosync(dev->hal_data->irq);
 		dev->intr_status = 0;
 	}
+
+	pm_qos_remove_request(&dev->qos);
 	venus_hfi_set_state(dev, VENUS_STATE_DEINIT);
 
 	dprintk(VIDC_INFO, "HAL exited\n");

drivers/media/platform/msm/vidc/venus_hfi.h

@@ -17,6 +17,7 @@
 #include <linux/clk.h>
 #include <linux/mutex.h>
 #include <linux/platform_device.h>
+#include <linux/pm_qos.h>
 #include <linux/spinlock.h>
 #include <linux/msm_iommu_domains.h>
 #include <soc/qcom/ocmem.h>
@@ -205,6 +206,7 @@ struct venus_hfi_device {
 	enum venus_hfi_state state;
 	struct hfi_packetization_ops *pkt_ops;
 	enum hfi_packetization_type packetization_type;
+	struct pm_qos_request qos;
 };
 
 void venus_hfi_delete_device(void *device);