gpu: nvgpu: gv11b: enable devfreq

After moving devfreq enable to end of finalize power on,
intermittent issues related to gpu booting with devfreq
enabled are fixed.

Enabled devfreq for gv11b by enabling ""nvhost_podgov"
governor in platform data.

Reused scaling functions from gp10b/gk20a.

Removed emc floor on railgate for power saving.
Added max emc frequency as floor in rail-ungate for
faster gpu boot.

Bug 2049965
Bug 2039013
Bug 200377508

Change-Id: Ia1dec278b663b9f7ed859dd953a60f3eae7ef9a0
Signed-off-by: seshendra Gadagottu <sgadagottu@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1644702
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

drivers/gpu/nvgpu/common/linux/platform_gp10b_tegra.c

@@ -1,7 +1,7 @@
 /*
  * GP10B Tegra Platform Interface
  *
- * Copyright (c) 2014-2017, NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2014-2018, NVIDIA CORPORATION.  All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
@@ -97,7 +97,7 @@ int gp10b_tegra_get_clocks(struct device *dev)
 	return 0;
 }
 
-static void gp10b_tegra_scale_init(struct device *dev)
+void gp10b_tegra_scale_init(struct device *dev)
 {
 	struct gk20a_platform *platform = gk20a_get_platform(dev);
 	struct gk20a_scale_profile *profile = platform->g->scale_profile;
@@ -265,7 +265,7 @@ int gp10b_tegra_reset_deassert(struct device *dev)
 	return ret;
 }
 
-static void gp10b_tegra_prescale(struct device *dev)
+void gp10b_tegra_prescale(struct device *dev)
 {
 	struct gk20a *g = get_gk20a(dev);
 	u32 avg = 0;
@@ -277,7 +277,7 @@ static void gp10b_tegra_prescale(struct device *dev)
 	gk20a_dbg_fn("done");
 }
 
-static void gp10b_tegra_postscale(struct device *pdev,
+void gp10b_tegra_postscale(struct device *pdev,
 					unsigned long freq)
 {
 	struct gk20a_platform *platform = gk20a_get_platform(pdev);
@@ -286,7 +286,7 @@ static void gp10b_tegra_postscale(struct device *pdev,
 	unsigned long emc_rate;
 
 	gk20a_dbg_fn("");
-	if (profile && !gp10b_tegra_is_railgated(pdev)) {
+	if (profile && !platform->is_railgated(pdev)) {
 		unsigned long emc_scale;
 
 		if (freq <= gp10b_freq_table[0])
@@ -306,7 +306,7 @@ static void gp10b_tegra_postscale(struct device *pdev,
 	gk20a_dbg_fn("done");
 }
 
-static long gp10b_round_clk_rate(struct device *dev, unsigned long rate)
+long gp10b_round_clk_rate(struct device *dev, unsigned long rate)
 {
 	struct gk20a *g = get_gk20a(dev);
 	struct gk20a_scale_profile *profile = g->scale_profile;
@@ -321,7 +321,7 @@ static long gp10b_round_clk_rate(struct device *dev, unsigned long rate)
 	return freq_table[max_states - 1];
 }
 
-static int gp10b_clk_get_freqs(struct device *dev,
+int gp10b_clk_get_freqs(struct device *dev,
 				unsigned long **freqs, int *num_freqs)
 {
 	struct gk20a_platform *platform = gk20a_get_platform(dev);

drivers/gpu/nvgpu/common/linux/platform_gv11b_tegra.c

@@ -23,6 +23,7 @@
 #include <linux/reset.h>
 #include <linux/hashtable.h>
 #include <linux/clk.h>
+#include <linux/platform/tegra/emc_bwmgr.h>
 
 #include <nvgpu/nvhost.h>
 
@@ -34,6 +35,7 @@
 #include "gk20a/gk20a.h"
 #include "platform_gk20a.h"
 #include "clk.h"
+#include "scale.h"
 
 #include "gp10b/platform_gp10b.h"
 #include "platform_gp10b_tegra.h"
@@ -135,9 +137,16 @@ static int gv11b_tegra_railgate(struct device *dev)
 {
 #ifdef TEGRA194_POWER_DOMAIN_GPU
 	struct gk20a_platform *platform = gk20a_get_platform(dev);
+	struct gk20a_scale_profile *profile = platform->g->scale_profile;
 	struct gk20a *g = get_gk20a(dev);
 	int i;
 
+	/* remove emc frequency floor */
+	if (profile)
+		tegra_bwmgr_set_emc(
+			(struct tegra_bwmgr_client *)profile->private_data,
+			0, TEGRA_BWMGR_SET_EMC_FLOOR);
+
 	if (tegra_bpmp_running()) {
 		nvgpu_log(g, gpu_dbg_info, "bpmp running");
 		if (!tegra_powergate_is_powered(TEGRA194_POWER_DOMAIN_GPU)) {
@@ -164,6 +173,7 @@ static int gv11b_tegra_unrailgate(struct device *dev)
 #ifdef TEGRA194_POWER_DOMAIN_GPU
 	struct gk20a_platform *platform = gk20a_get_platform(dev);
 	struct gk20a *g = get_gk20a(dev);
+	struct gk20a_scale_profile *profile = platform->g->scale_profile;
 	int i;
 
 	if (tegra_bpmp_running()) {
@@ -182,6 +192,13 @@ static int gv11b_tegra_unrailgate(struct device *dev)
 	} else {
 		nvgpu_log(g, gpu_dbg_info, "bpmp not running");
 	}
+
+	/* to start with set emc frequency floor to max rate*/
+	if (profile)
+		tegra_bwmgr_set_emc(
+			(struct tegra_bwmgr_client *)profile->private_data,
+			tegra_bwmgr_get_max_emc_rate(),
+			TEGRA_BWMGR_SET_EMC_FLOOR);
 #endif
 	return ret;
 }
@@ -225,6 +242,17 @@ struct gk20a_platform gv11b_tegra_platform = {
 	.busy = gk20a_tegra_busy,
 	.idle = gk20a_tegra_idle,
 
+	.clk_round_rate = gp10b_round_clk_rate,
+	.get_clk_freqs = gp10b_clk_get_freqs,
+
+	/* frequency scaling configuration */
+	.initscale = gp10b_tegra_scale_init,
+	.prescale = gp10b_tegra_prescale,
+	.postscale = gp10b_tegra_postscale,
+	.devfreq_governor = "nvhost_podgov",
+
+	.qos_notify = gk20a_scale_qos_notify,
+
 	.dump_platform_dependencies = gk20a_tegra_debug_dump,
 
 	.soc_name = "tegra19x",

drivers/gpu/nvgpu/gp10b/platform_gp10b.h

@@ -1,7 +1,7 @@
 /*
  * GP10B Platform (SoC) Interface
  *
- * Copyright (c) 2014-2017, NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2014-2018, NVIDIA CORPORATION.  All rights reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
@@ -30,5 +30,10 @@ struct device;
 int gp10b_tegra_get_clocks(struct device *dev);
 int gp10b_tegra_reset_assert(struct device *dev);
 int gp10b_tegra_reset_deassert(struct device *dev);
-
+void gp10b_tegra_scale_init(struct device *dev);
+long gp10b_round_clk_rate(struct device *dev, unsigned long rate);
+int gp10b_clk_get_freqs(struct device *dev,
+			unsigned long **freqs, int *num_freqs);
+void gp10b_tegra_prescale(struct device *dev);
+void gp10b_tegra_postscale(struct device *pdev, unsigned long freq);
 #endif