From bcd78a0be617be07234e3ef4925cecaef66f2fa4 Mon Sep 17 00:00:00 2001
From: Seema Khowala <seemaj@nvidia.com>
Date: Tue, 31 Oct 2017 20:56:29 -0700
Subject: nvgpu: gv11b: implement railgate/unrailgate

Implement gv11b platform specific rail gating functions
by calling relevant powergate and unpowergate functions
and linux clock frmework functions:

gv11b_tegra_is_railgated
gv11b_tegra_railgate
gv11b_tegra_unrailgate

These calls will take care of hot reset sequence
required for gpu powergate and gpu unpowergate.

Bug 200269361
Bug 200273571

Change-Id: Ib1825e4324d51fc508b3b5dc9e5e2fdb252eeff4
Signed-off-by: seshendra Gadagottu <sgadagottu@nvidia.com>
Signed-off-by: Seema Khowala <seemaj@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1589509
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/gv11b/platform_gv11b_tegra.c | 59 ++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)

(limited to 'drivers/gpu/nvgpu/gv11b/platform_gv11b_tegra.c')

diff --git a/drivers/gpu/nvgpu/gv11b/platform_gv11b_tegra.c b/drivers/gpu/nvgpu/gv11b/platform_gv11b_tegra.c
index ca346d97..95d82254 100644
--- a/drivers/gpu/nvgpu/gv11b/platform_gv11b_tegra.c
+++ b/drivers/gpu/nvgpu/gv11b/platform_gv11b_tegra.c
@@ -28,11 +28,15 @@
 #include <linux/nvmap.h>
 #include <linux/reset.h>
 #include <linux/hashtable.h>
+#include <linux/clk.h>
 #include <nvgpu/nvhost.h>
 #include <nvgpu/nvhost_t19x.h>
 
 #include <uapi/linux/nvgpu.h>
 
+#include <soc/tegra/tegra_bpmp.h>
+#include <soc/tegra/tegra_powergate.h>
+
 #include "gk20a/gk20a.h"
 #include "common/linux/platform_gk20a.h"
 #include "common/linux/clk.h"
@@ -103,18 +107,73 @@ static int gv11b_tegra_remove(struct device *dev)
 static bool gv11b_tegra_is_railgated(struct device *dev)
 {
 	bool ret = false;
+#ifdef TEGRA194_POWER_DOMAIN_GPU
+	struct gk20a *g = get_gk20a(dev);
+
+	if (tegra_bpmp_running()) {
+		nvgpu_log(g, gpu_dbg_info, "bpmp running");
+		ret = !tegra_powergate_is_powered(TEGRA194_POWER_DOMAIN_GPU);
 
+		nvgpu_log(g, gpu_dbg_info, "railgated? %s", ret ? "yes" : "no");
+	} else {
+		nvgpu_log(g, gpu_dbg_info, "bpmp not running");
+	}
+#endif
 	return ret;
 }
 
 static int gv11b_tegra_railgate(struct device *dev)
 {
+#ifdef TEGRA194_POWER_DOMAIN_GPU
+	struct gk20a_platform *platform = gk20a_get_platform(dev);
+	struct gk20a *g = get_gk20a(dev);
+	int i;
+
+	if (tegra_bpmp_running()) {
+		nvgpu_log(g, gpu_dbg_info, "bpmp running");
+		if (!tegra_powergate_is_powered(TEGRA194_POWER_DOMAIN_GPU)) {
+			nvgpu_log(g, gpu_dbg_info, "powergate is not powered");
+			return 0;
+		}
+		nvgpu_log(g, gpu_dbg_info, "clk_disable_unprepare");
+		for (i = 0; i < platform->num_clks; i++) {
+			if (platform->clk[i])
+				clk_disable_unprepare(platform->clk[i]);
+		}
+		nvgpu_log(g, gpu_dbg_info, "powergate_partition");
+		tegra_powergate_partition(TEGRA194_POWER_DOMAIN_GPU);
+	} else {
+		nvgpu_log(g, gpu_dbg_info, "bpmp not running");
+	}
+#endif
 	return 0;
 }
 
 static int gv11b_tegra_unrailgate(struct device *dev)
 {
 	int ret = 0;
+#ifdef TEGRA194_POWER_DOMAIN_GPU
+	struct gk20a_platform *platform = gk20a_get_platform(dev);
+	struct gk20a *g = get_gk20a(dev);
+	int i;
+
+	if (tegra_bpmp_running()) {
+		nvgpu_log(g, gpu_dbg_info, "bpmp running");
+		ret = tegra_unpowergate_partition(TEGRA194_POWER_DOMAIN_GPU);
+		if (ret) {
+			nvgpu_log(g, gpu_dbg_info,
+				"unpowergate partition failed");
+			return ret;
+		}
+		nvgpu_log(g, gpu_dbg_info, "clk_prepare_enable");
+		for (i = 0; i < platform->num_clks; i++) {
+			if (platform->clk[i])
+				clk_prepare_enable(platform->clk[i]);
+		}
+	} else {
+		nvgpu_log(g, gpu_dbg_info, "bpmp not running");
+	}
+#endif
 	return ret;
 }
 
-- 
cgit v1.2.2