[PATCH 14/18] drm/amd/display: Add power down display on boot flag

[sunpeng.li at amd.com]

From: Thomas Lim <Thomas.Lim at amd.com>

[Why]

Due to the generic introduction of seamless boot, the display is no
longer blanked upon boot. However, this causes corruption on some
systems that does not lock the memory in the non-secure boot case,
resulting in brief corruption on boot due to garbage being written into
the frame buffer.

[How]
Add a flag, read during DC init, to determine whether display should be
blanked on boot. Default to true.

Change-Id: Iba2aa0b57d9bf71d6fc8bcc34ffb60cf54937f02
Signed-off-by: Thomas Lim <Thomas.Lim at amd.com>
Reviewed-by: Aric Cyr <Aric.Cyr at amd.com>
Acked-by: Anthony Koo <Anthony.Koo at amd.com>
Acked-by: Leo Li <sunpeng.li at amd.com>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c         | 2 ++
 drivers/gpu/drm/amd/display/dc/dc.h                       | 1 +
 drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c | 2 +-
 3 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 9933aee..f521864 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -534,6 +534,8 @@ static int amdgpu_dm_init(struct amdgpu_device *adev)
 	if (amdgpu_dc_feature_mask & DC_FBC_MASK)
 		init_data.flags.fbc_support = true;
 
+	init_data.flags.power_down_display_on_boot = true;
+
 	/* Display Core create. */
 	adev->dm.dc = dc_create(&init_data);
 
diff --git a/drivers/gpu/drm/amd/display/dc/dc.h b/drivers/gpu/drm/amd/display/dc/dc.h
index 8f2b2d4..428175e0 100644
--- a/drivers/gpu/drm/amd/display/dc/dc.h
+++ b/drivers/gpu/drm/amd/display/dc/dc.h
@@ -207,6 +207,7 @@ struct dc_config {
 	bool optimize_edp_link_rate;
 	bool disable_fractional_pwm;
 	bool allow_seamless_boot_optimization;
+	bool power_down_display_on_boot;
 };
 
 enum visual_confirm {
diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
index 549836c..7e173c7 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
@@ -1118,7 +1118,7 @@ static void dcn10_init_hw(struct dc *dc)
 	 * Otherwise, if taking control is not possible, we need to power
 	 * everything down.
 	 */
-	if (dcb->funcs->is_accelerated_mode(dcb)) {
+	if (dcb->funcs->is_accelerated_mode(dcb) || dc->config.power_down_display_on_boot) {
 		for (i = 0; i < dc->res_pool->pipe_count; i++) {
 			struct hubp *hubp = dc->res_pool->hubps[i];
 			struct dpp *dpp = dc->res_pool->dpps[i];
-- 
2.7.4