gpu: nvgpu: implement reset_assert/deassert for gp10b

Implement platform specific reset_assert() and reset_deassert()
calls for gp10b

These APIs will in turn will use reset_control APIs to do
their work

Also, set force_reset_in_do_idle = true for gp10b, since
railgating is not supported yet

Bug 200137963

Change-Id: I2c0fe1273d3ecfd0c46704a44374712052ff51d6
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: http://git-master/r/797150
(cherry picked from commit 6ac04ca84cee8a4d3b089678c81534799880712d)
Reviewed-on: http://git-master/r/808240
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 32 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gp10b/platform_gp10b_tegra.c b/drivers/gpu/nvgpu/gp10b/platform_gp10b_tegra.c
index fbca62b0..a4348f6c 100644
--- a/drivers/gpu/nvgpu/gp10b/platform_gp10b_tegra.c
+++ b/drivers/gpu/nvgpu/gp10b/platform_gp10b_tegra.c
@@ -24,6 +24,7 @@
 #include <linux/dma-buf.h>
 #include <linux/nvmap.h>
 #include <linux/tegra_pm_domains.h>
+#include <linux/reset.h>
 #include "gk20a/platform_gk20a.h"
 #include "gk20a/gk20a.h"
 #include "platform_tegra.h"
@@ -178,6 +179,32 @@ static int gp10b_tegra_suspend(struct device *dev)
         return 0;
 }
 
+static int gp10b_tegra_reset_assert(struct platform_device *dev)
+{
+        struct gk20a_platform *platform = gk20a_get_platform(dev);
+        int ret = 0;
+
+        if (!platform->reset_control)
+                return -EINVAL;
+
+        ret = reset_control_assert(platform->reset_control);
+
+        return ret;
+}
+
+static int gp10b_tegra_reset_deassert(struct platform_device *dev)
+{
+        struct gk20a_platform *platform = gk20a_get_platform(dev);
+        int ret = 0;
+
+        if (!platform->reset_control)
+                return -EINVAL;
+
+        ret = reset_control_deassert(platform->reset_control);
+
+        return ret;
+}
+
 struct gk20a_platform t18x_gpu_tegra_platform = {
         .has_syncpoints = true,
 
@@ -209,4 +236,9 @@ struct gk20a_platform t18x_gpu_tegra_platform = {
 
         .secure_alloc = gk20a_tegra_secure_alloc,
         .secure_page_alloc = gk20a_tegra_secure_page_alloc,
+
+        .reset_assert = gp10b_tegra_reset_assert,
+        .reset_deassert = gp10b_tegra_reset_deassert,
+
+        .force_reset_in_do_idle = true,
 };