It's enabled by default. -1 is auto, to allow both vram and gtt
memory be available, for testing purpose only.
---
drivers/gpu/drm/amd/amdgpu/amdgpu.h | 1 +
drivers/gpu/drm/amd/amdgpu/amdgpu_display.c | 9 +++++++--
drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 4 ++++
drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c | 5 +++++
4 files changed, 17 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 292c7e7..6b0ee34 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -129,6 +129,7 @@ extern int amdgpu_lbpw;
extern int amdgpu_compute_multipipe;
extern int amdgpu_gpu_recovery;
extern int amdgpu_emu_mode;
+extern int amdgpu_sg_display;
#ifdef CONFIG_DRM_AMDGPU_SI
extern int amdgpu_si_support;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
index 5495b29..dfa11b1 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
@@ -513,8 +513,13 @@ uint32_t amdgpu_display_framebuffer_domains(struct amdgpu_device *adev)
#if defined(CONFIG_DRM_AMD_DC)
if (adev->asic_type >= CHIP_CARRIZO && adev->asic_type < CHIP_RAVEN &&
adev->flags & AMD_IS_APU &&
- amdgpu_device_asic_has_dc_support(adev->asic_type))
- domain |= AMDGPU_GEM_DOMAIN_GTT;
+ amdgpu_device_asic_has_dc_support(adev->asic_type)) {
+ if (amdgpu_sg_display == 1) {
+ domain = AMDGPU_GEM_DOMAIN_GTT;
+ } else if (amdgpu_sg_display == -1) {
+ domain |= AMDGPU_GEM_DOMAIN_GTT;
+ }
+ }
#endif
return domain;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index e670936..f0ada24 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -132,6 +132,7 @@ int amdgpu_lbpw = -1;
int amdgpu_compute_multipipe = -1;
int amdgpu_gpu_recovery = -1; /* auto */
int amdgpu_emu_mode = 0;
+int amdgpu_sg_display = 1;
MODULE_PARM_DESC(vramlimit, "Restrict VRAM for testing, in megabytes");
module_param_named(vramlimit, amdgpu_vram_limit, int, 0600);
@@ -290,6 +291,9 @@ module_param_named(gpu_recovery, amdgpu_gpu_recovery, int, 0444);
MODULE_PARM_DESC(emu_mode, "Emulation mode, (1 = enable, 0 = disable)");
module_param_named(emu_mode, amdgpu_emu_mode, int, 0444);
+MODULE_PARM_DESC(sg_display, "Enable scatter gather display, (1 = enable, 0 = disable, -1 = auto");
+module_param_named(sg_display, amdgpu_sg_display, int, 0444);
+
#ifdef CONFIG_DRM_AMDGPU_SI
#if defined(CONFIG_DRM_RADEON) || defined(CONFIG_DRM_RADEON_MODULE)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c
index 1206301..10f1f4f 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c
@@ -138,6 +138,11 @@ static int amdgpufb_create_pinned_object(struct amdgpu_fbdev *rfbdev,
mode_cmd->pitches[0] = amdgpu_align_pitch(adev, mode_cmd->width, cpp,
fb_tiled);
domain = amdgpu_display_framebuffer_domains(adev);
+ if (domain == AMDGPU_GEM_DOMAIN_GTT) {
+ DRM_INFO("Scatter gather display: enabled\n");
+ } else if (domain & AMDGPU_GEM_DOMAIN_GTT) {
+ DRM_INFO("Scatter gather display: auto\n");
+ }
height = ALIGN(mode_cmd->height, 8);
size = mode_cmd->pitches[0] * height;
--
2.7.4
