1 files changed, 54 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/common/linux/sysfs.c b/drivers/gpu/nvgpu/common/linux/sysfs.c
index 6709285d..1f6da803 100644
--- a/drivers/gpu/nvgpu/common/linux/sysfs.c
+++ b/drivers/gpu/nvgpu/common/linux/sysfs.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2011-2017, NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2011-2018, 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,
@@ -504,6 +504,58 @@ static ssize_t elpg_enable_read(struct device *dev,
 
 static DEVICE_ATTR(elpg_enable, ROOTRW, elpg_enable_read, elpg_enable_store);
 
+static ssize_t ldiv_slowdown_factor_store(struct device *dev,
+        struct device_attribute *attr, const char *buf, size_t count)
+{
+        struct gk20a *g = get_gk20a(dev);
+        unsigned long val = 0;
+        int err;
+
+        if (kstrtoul(buf, 10, &val) < 0) {
+                nvgpu_err(g, "parse error for input SLOWDOWN factor\n");
+                return -EINVAL;
+        }
+
+        if (val >= SLOWDOWN_FACTOR_FPDIV_BYMAX) {
+                nvgpu_err(g, "Invalid SLOWDOWN factor\n");
+                return -EINVAL;
+        }
+
+        if (val == g->ldiv_slowdown_factor)
+                return count;
+
+        if (!g->power_on) {
+                g->ldiv_slowdown_factor = val;
+        } else {
+                err = gk20a_busy(g);
+                if (err)
+                        return -EAGAIN;
+
+                g->ldiv_slowdown_factor = val;
+
+                if (g->ops.pmu.pmu_pg_init_param)
+                        g->ops.pmu.pmu_pg_init_param(g,
+                                PMU_PG_ELPG_ENGINE_ID_GRAPHICS);
+
+                gk20a_idle(g);
+        }
+
+        nvgpu_info(g, "ldiv_slowdown_factor is %x\n", g->ldiv_slowdown_factor);
+
+        return count;
+}
+
+static ssize_t ldiv_slowdown_factor_read(struct device *dev,
+        struct device_attribute *attr, char *buf)
+{
+        struct gk20a *g = get_gk20a(dev);
+
+        return snprintf(buf, PAGE_SIZE, "%d\n", g->ldiv_slowdown_factor);
+}
+
+static DEVICE_ATTR(ldiv_slowdown_factor, ROOTRW,
+                        ldiv_slowdown_factor_read, ldiv_slowdown_factor_store);
+
 static ssize_t mscg_enable_store(struct device *dev,
         struct device_attribute *attr, const char *buf, size_t count)
 {
@@ -1114,6 +1166,7 @@ int nvgpu_create_sysfs(struct device *dev)
         error |= device_create_file(dev, &dev_attr_elpg_enable);
         error |= device_create_file(dev, &dev_attr_mscg_enable);
         error |= device_create_file(dev, &dev_attr_emc3d_ratio);
+        error |= device_create_file(dev, &dev_attr_ldiv_slowdown_factor);
 #ifdef CONFIG_TEGRA_DVFS
         error |= device_create_file(dev, &dev_attr_fmax_at_vmin_safe);
 #endif