Merge "msm: kgsl: Add GPU Cx ipeak client support on SDM660"

Documentation/devicetree/bindings/gpu/adreno.txt

@@ -110,6 +110,17 @@ Optional Properties:
 - qcom,l2pc-cpu-mask-latency:
 				The CPU mask latency in microseconds to avoid L2PC
 				on masked CPUs.
+
+- qcom,gpu-cx-ipeak:
+				To handle Cx peak current limit.
+				<phandle bit>
+				phandle - phandle of cx ipeak device node
+				bit     - bit number of client in relevant register
+- qcom,gpu-cx-ipeak-clk:
+				GPU clock threshold for Cx Ipeak voting. KGSL votes
+				to Cx Ipeak driver when GPU clock crosses this threshold.
+				Cx Ipeak can limit peak current based on voting from other clients.
+
 - qcom,force-32bit:
 				Force the GPU to use 32 bit data sizes even if
 				it is capable of doing 64 bit.

drivers/gpu/msm/kgsl_pwrctrl.c

@@ -361,6 +361,26 @@ void kgsl_pwrctrl_pwrlevel_change(struct kgsl_device *device,
 	if (new_level == old_level)
 		return;
 
+	if (pwr->gpu_cx_ipeak) {
+		unsigned int old_freq = pwr->pwrlevels[old_level].gpu_freq;
+		unsigned int new_freq = pwr->pwrlevels[new_level].gpu_freq;
+
+		/*
+		 * Set Cx ipeak vote for GPU if it tries to cross
+		 * threshold frequency.
+		 */
+		if (old_freq < pwr->gpu_cx_ipeak_clk &&
+			new_freq >= pwr->gpu_cx_ipeak_clk) {
+			int ret = cx_ipeak_update(pwr->gpu_cx_ipeak, true);
+
+			if (ret) {
+				KGSL_PWR_ERR(device,
+					"cx_ipeak_update failed %d\n", ret);
+				return;
+			}
+		}
+	}
+
 	kgsl_pwrscale_update_stats(device);
 
 	/*
@@ -422,6 +442,24 @@ void kgsl_pwrctrl_pwrlevel_change(struct kgsl_device *device,
 
 	/* Timestamp the frequency change */
 	device->pwrscale.freq_change_time = ktime_to_ms(ktime_get());
+
+	if (pwr->gpu_cx_ipeak) {
+		unsigned int old_freq = pwr->pwrlevels[old_level].gpu_freq;
+		unsigned int new_freq = pwr->pwrlevels[new_level].gpu_freq;
+
+		/*
+		 * Reset Cx ipeak vote for GPU if it goes below
+		 * threshold frequency.
+		 */
+		if (old_freq >= pwr->gpu_cx_ipeak_clk &&
+			new_freq < pwr->gpu_cx_ipeak_clk) {
+			int ret = cx_ipeak_update(pwr->gpu_cx_ipeak, false);
+
+			if (ret)
+				KGSL_PWR_ERR(device,
+					"cx_ipeak_update failed %d\n", ret);
+		}
+	}
 }
 EXPORT_SYMBOL(kgsl_pwrctrl_pwrlevel_change);
 
@@ -2217,8 +2255,37 @@ int kgsl_pwrctrl_init(struct kgsl_device *device)
 	of_property_read_string(pdev->dev.of_node, "qcom,tsens-name",
 		&pwr->tsens_name);
 
+	/* Cx ipeak client support */
+	if (of_find_property(pdev->dev.of_node, "qcom,gpu-cx-ipeak", NULL)) {
+		if (!of_property_read_u32(pdev->dev.of_node,
+			"qcom,gpu-cx-ipeak-clk", &pwr->gpu_cx_ipeak_clk)) {
+			pwr->gpu_cx_ipeak = cx_ipeak_register(pdev->dev.of_node,
+						"qcom,gpu-cx-ipeak");
+		} else {
+			KGSL_PWR_ERR(device, "failed to get gpu cxip clk\n");
+			result = -EINVAL;
+			goto error_cleanup_pwr_limit;
+		}
+
+		if (IS_ERR(pwr->gpu_cx_ipeak)) {
+			result = PTR_ERR(pwr->gpu_cx_ipeak);
+			KGSL_PWR_ERR(device,
+				"Failed to register Cx ipeak client %d\n",
+				result);
+			goto error_cleanup_pwr_limit;
+		}
+	}
 	return result;
 
+error_cleanup_pwr_limit:
+	pwr->power_flags = 0;
+
+	if (!IS_ERR_OR_NULL(pwr->sysfs_pwr_limit)) {
+		list_del(&pwr->sysfs_pwr_limit->node);
+		kfree(pwr->sysfs_pwr_limit);
+		pwr->sysfs_pwr_limit = NULL;
+	}
+	kfree(pwr->bus_ib);
 error_cleanup_pcl:
 	_close_pcl(pwr);
 error_cleanup_ocmem_pcl:
@@ -2238,6 +2305,8 @@ void kgsl_pwrctrl_close(struct kgsl_device *device)
 
 	KGSL_PWR_INFO(device, "close device %d\n", device->id);
 
+	cx_ipeak_unregister(pwr->gpu_cx_ipeak);
+
 	pwr->power_flags = 0;
 
 	if (!IS_ERR_OR_NULL(pwr->sysfs_pwr_limit)) {

drivers/gpu/msm/kgsl_pwrctrl.h

@@ -1,4 +1,4 @@
-/* Copyright (c) 2010-2016, The Linux Foundation. All rights reserved.
+/* Copyright (c) 2010-2017, The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
@@ -14,6 +14,7 @@
 #define __KGSL_PWRCTRL_H
 
 #include <linux/pm_qos.h>
+#include <soc/qcom/cx_ipeak.h>
 
 /*****************************************************************************
 ** power flags
@@ -153,6 +154,8 @@ struct kgsl_regulator {
  * isense_clk_indx - index of isense clock, 0 if no isense
  * isense_clk_on_level - isense clock rate is XO rate below this level.
  * tsens_name - pointer to temperature sensor name of GPU temperature sensor
+ * gpu_cx_ipeak - pointer to cx ipeak client used by GPU
+ * gpu_cx_ipeak_clk - GPU threshold frequency to call cx ipeak driver API
  */
 
 struct kgsl_pwrctrl {
@@ -206,6 +209,8 @@ struct kgsl_pwrctrl {
 	unsigned int gpu_bimc_int_clk_freq;
 	bool gpu_bimc_interface_enabled;
 	const char *tsens_name;
+	struct cx_ipeak_client *gpu_cx_ipeak;
+	unsigned int gpu_cx_ipeak_clk;
 };
 
 int kgsl_pwrctrl_init(struct kgsl_device *device);