[PATCH v2 3/4] drm/amd: Add a module parameter for seamless boot

[Mario Limonciello]

The module parameter can be used to test more easily enabling seamless
boot support on additional ASICs.

Reviewed-by: Harry Wentland <harry.wentl...@amd.com>
Signed-off-by: Mario Limonciello <mario.limoncie...@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu.h        |  1 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 20 +++++++++++++++++---
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c    |  8 ++++++++
 3 files changed, 26 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h 
b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 38a10d6be921..875448c44afa 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -246,6 +246,7 @@ extern int amdgpu_num_kcq;
 extern int amdgpu_vcnfw_log;
 extern int amdgpu_sg_display;
 extern int amdgpu_umsch_mm;
+extern int amdgpu_seamless;
 
 extern int amdgpu_user_partt_mode;
 
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 7187eeb8ffa6..2116e016178a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -1367,11 +1367,25 @@ bool amdgpu_device_need_post(struct amdgpu_device *adev)
  */
 bool amdgpu_device_seamless_boot_supported(struct amdgpu_device *adev)
 {
+       switch (amdgpu_seamless) {
+       case -1:
+               break;
+       case 1:
+               return true;
+       case 0:
+               return false;
+       default:
+               DRM_ERROR("Invalid value for amdgpu.seamless: %d\n",
+                         amdgpu_seamless);
+               return false;
+       }
+
+       if (adev->mman.keep_stolen_vga_memory)
+               return false;
+
        switch (adev->ip_versions[DCE_HWIP][0]) {
        case IP_VERSION(3, 0, 1):
-               if (!adev->mman.keep_stolen_vga_memory)
-                       return true;
-               break;
+               return true;
        default:
                break;
        }
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index 90d6c5e5d66d..e3471293846f 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -203,6 +203,7 @@ int amdgpu_vcnfw_log;
 int amdgpu_sg_display = -1; /* auto */
 int amdgpu_user_partt_mode = AMDGPU_AUTO_COMPUTE_PARTITION_MODE;
 int amdgpu_umsch_mm;
+int amdgpu_seamless = -1; /* auto */
 uint amdgpu_debug_mask;
 
 static void amdgpu_drv_delayed_reset_work_handler(struct work_struct *work);
@@ -938,6 +939,13 @@ module_param_named(user_partt_mode, 
amdgpu_user_partt_mode, uint, 0444);
 module_param(enforce_isolation, bool, 0444);
 MODULE_PARM_DESC(enforce_isolation, "enforce process isolation between 
graphics and compute . enforce_isolation = on");
 
+/**
+ * DOC: seamless (int)
+ * Seamless boot will keep the image on the screen during the boot process.
+ */
+MODULE_PARM_DESC(seamless, "Seamless boot (-1 = auto (default), 0 = disable, 1 
= enable)");
+module_param_named(seamless, amdgpu_seamless, int, 0444);
+
 /**
  * DOC: debug_mask (uint)
  * Debug options for amdgpu, work as a binary mask with the following options:
-- 
2.34.1