drm/amdgpu: disable runtime pm on PX laptops without dGPU power control

commit bedf2a65c1aa8fb29ba8527fd00c0f68ec1f55f1 upstream.

Some PX laptops don't provide an ACPI method to control dGPU power.  On
those systems, the driver is responsible for handling the dGPU power
state.  Disable runtime PM on them until support for this is implemented.

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_atpx_handler.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_atpx_handler.c
index 5a8fbadbd27b4ca0ed663f4ad9cad804b9aae87f..8ac49812a71622b586a7eb1a9a54e44dc5bcb59d 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_atpx_handler.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_atpx_handler.c
@@ -63,6 +63,10 @@ bool amdgpu_has_atpx(void) {
        return amdgpu_atpx_priv.atpx_detected;
 }
 
+bool amdgpu_has_atpx_dgpu_power_cntl(void) {
+       return amdgpu_atpx_priv.atpx.functions.power_cntl;
+}
+
 /**
  * amdgpu_atpx_call - call an ATPX method
  *
@@ -142,10 +146,6 @@ static void amdgpu_atpx_parse_functions(struct amdgpu_atpx_functions *f, u32 mas
  */
 static int amdgpu_atpx_validate(struct amdgpu_atpx *atpx)
 {
-       /* make sure required functions are enabled */
-       /* dGPU power control is required */
-       atpx->functions.power_cntl = true;
-
        if (atpx->functions.px_params) {
                union acpi_object *info;
                struct atpx_px_params output;

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index c961fe093e12fb3d7fc4f71b358ef594bfc8621c..9d88023df836e84220218bd63dcf48be8430b2f3 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -61,6 +61,12 @@ static const char *amdgpu_asic_name[] = {
        "LAST",
 };
 
+#if defined(CONFIG_VGA_SWITCHEROO)
+bool amdgpu_has_atpx_dgpu_power_cntl(void);
+#else
+static inline bool amdgpu_has_atpx_dgpu_power_cntl(void) { return false; }
+#endif
+
 bool amdgpu_device_is_px(struct drm_device *dev)
 {
        struct amdgpu_device *adev = dev->dev_private;
@@ -1469,7 +1475,7 @@ int amdgpu_device_init(struct amdgpu_device *adev,
 
        if (amdgpu_runtime_pm == 1)
                runtime = true;
-       if (amdgpu_device_is_px(ddev))
+       if (amdgpu_device_is_px(ddev) && amdgpu_has_atpx_dgpu_power_cntl())
                runtime = true;
        vga_switcheroo_register_client(adev->pdev, &amdgpu_switcheroo_ops, runtime);
        if (runtime)