[PATCH 3/5] drm/radeon: Add module param to control SI support

[Felix Kuehling]

If AMDGPU supports SI, add a module parameter to control SI
support in radeon. It's on by default in radeon, while it will be
off by default in AMDGPU as long as SI support is experimental.

Signed-off-by: Felix Kuehling <Felix.Kuehling at amd.com>
---
 drivers/gpu/drm/radeon/radeon.h     |  3 +++
 drivers/gpu/drm/radeon/radeon_drv.c |  6 ++++++
 drivers/gpu/drm/radeon/radeon_kms.c | 14 ++++++++++++++
 3 files changed, 23 insertions(+)

diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 8d2a021..8698812 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -116,6 +116,9 @@
 extern int radeon_uvd;
 extern int radeon_vce;
 
+#ifdef CONFIG_DRM_AMDGPU_SI
+extern int radeon_si_support;
+#endif
 #ifdef CONFIG_DRM_AMDGPU_CIK
 extern int radeon_cik_support;
 #endif
diff --git a/drivers/gpu/drm/radeon/radeon_drv.c b/drivers/gpu/drm/radeon/radeon_drv.c
index 2cdb01b..247a923 100644
--- a/drivers/gpu/drm/radeon/radeon_drv.c
+++ b/drivers/gpu/drm/radeon/radeon_drv.c
@@ -301,6 +301,12 @@ static inline void radeon_unregister_atpx_handler(void) {}
 MODULE_PARM_DESC(vce, "vce enable/disable vce support (1 = enable, 0 = disable)");
 module_param_named(vce, radeon_vce, int, 0444);
 
+#ifdef CONFIG_DRM_AMDGPU_SI
+int radeon_si_support = 1;
+MODULE_PARM_DESC(si_support, "SI support (1 = enabled (default), 0 = disabled)");
+module_param_named(si_support, radeon_si_support, int, 0444);
+#endif
+
 #ifdef CONFIG_DRM_AMDGPU_CIK
 int radeon_cik_support = 0;
 MODULE_PARM_DESC(cik_support, "CIK support (1 = enabled, 0 = disabled (default))");
diff --git a/drivers/gpu/drm/radeon/radeon_kms.c b/drivers/gpu/drm/radeon/radeon_kms.c
index 9453e28..63d9f2d 100644
--- a/drivers/gpu/drm/radeon/radeon_kms.c
+++ b/drivers/gpu/drm/radeon/radeon_kms.c
@@ -99,6 +99,20 @@ int radeon_driver_load_kms(struct drm_device *dev, unsigned long flags)
 	struct radeon_device *rdev;
 	int r, acpi_status;
 
+#ifdef CONFIG_DRM_AMDGPU_SI
+	if (!radeon_si_support) {
+		switch (flags & RADEON_FAMILY_MASK) {
+		case CHIP_TAHITI:
+		case CHIP_PITCAIRN:
+		case CHIP_VERDE:
+		case CHIP_OLAND:
+		case CHIP_HAINAN:
+			dev_info(dev->dev,
+				 "SI support disabled by module param\n");
+			return -ENODEV;
+		}
+	}
+#endif
 #ifdef CONFIG_DRM_AMDGPU_CIK
 	if (!radeon_cik_support) {
 		switch (flags & RADEON_FAMILY_MASK) {
-- 
1.9.1