gpu: nvgpu: Disable rail gating for dGPU

Bug 200224907

Change-Id: I515bba1987e54fb5ab78efda85916b6f0d3a4297
Signed-off-by: Lakshmanan M <lm@nvidia.com>
Reviewed-on: http://git-master/r/1201233
(cherry picked from commit aa45908e77d451376728860cebe3938e765c4388)
Reviewed-on: http://git-master/r/1201654
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 16 insertions, 11 deletions

diff --git a/drivers/gpu/nvgpu/pci.c b/drivers/gpu/nvgpu/pci.c
index 5165c715..5d058ed9 100644
--- a/drivers/gpu/nvgpu/pci.c
+++ b/drivers/gpu/nvgpu/pci.c
@@ -47,6 +47,7 @@ static struct gk20a_platform nvgpu_pci_device = {
 
         /* power management configuration */
         .railgate_delay         = 500,
+        .can_railgate           = false,
         .can_elpg = false,
 
         /* power management callbacks */
@@ -165,17 +166,21 @@ static int nvgpu_pci_pm_init(struct device *dev)
 #ifdef CONFIG_PM
         struct gk20a_platform *platform = gk20a_get_platform(dev);
 
-        if (platform->railgate_delay)
-                pm_runtime_set_autosuspend_delay(dev,
-                        platform->railgate_delay);
-
-        /*
-         * Runtime PM for PCI devices is disabled by default,
-         * so we need to enable it first
-         */
-        pm_runtime_use_autosuspend(dev);
-        pm_runtime_put_noidle(dev);
-        pm_runtime_allow(dev);
+        if (!platform->can_railgate) {
+                pm_runtime_disable(dev);
+        } else {
+                if (platform->railgate_delay)
+                        pm_runtime_set_autosuspend_delay(dev,
+                                platform->railgate_delay);
+
+                /*
+                 * Runtime PM for PCI devices is disabled by default,
+                 * so we need to enable it first
+                 */
+                pm_runtime_use_autosuspend(dev);
+                pm_runtime_put_noidle(dev);
+                pm_runtime_allow(dev);
+        }
 #endif
         return 0;
 }