[PATCH AUTOSEL 5.14 061/252] drm/amd/display: Fixed hardware power down bypass during headless boot

Sasha Levin
2021-09-09T11:45:39Z

From: Jake Wang <haonan.wang2@amd.com>

[ Upstream commit 3addbde269f21ffc735f6d3d0c2237664923824e ]

[Why]
During headless boot, DIG may be on which causes HW/SW discrepancies.
To avoid this we power down hardware on boot if DIG is turned on. With
introduction of multiple eDP, hardware power down is being bypassed
under certain conditions.

[How]
Fixed hardware power down bypass, and ensured hardware will power down
if DIG is on and seamless boot is not enabled.

Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Jake Wang <haonan.wang2@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
.../amd/display/dc/dcn10/dcn10_hw_sequencer.c | 27 +++++++++----------
.../drm/amd/display/dc/dcn30/dcn30_hwseq.c | 25 ++++++++---------
.../drm/amd/display/dc/dcn31/dcn31_hwseq.c | 5 +++-
3 files changed, 27 insertions(+), 30 deletions(-)

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 c545eddabdcc..dee1ce5f9609 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
@@ -1502,25 +1502,22 @@ void dcn10_init_hw(struct dc *dc)
void dcn10_power_down_on_boot(struct dc *dc)
{
struct dc_link *edp_links[MAX_NUM_EDP];
- struct dc_link *edp_link;
+ struct dc_link *edp_link = NULL;
int edp_num;
int i = 0;

get_edp_links(dc, edp_links, &edp_num);
-
- if (edp_num) {
- for (i = 0; i < edp_num; i++) {
- edp_link = edp_links[i];
- if (edp_link->link_enc->funcs->is_dig_enabled &&
- edp_link->link_enc->funcs->is_dig_enabled(edp_link->link_enc) &&
- dc->hwseq->funcs.edp_backlight_control &&
- dc->hwss.power_down &&
- dc->hwss.edp_power_control) {
- dc->hwseq->funcs.edp_backlight_control(edp_link, false);
- dc->hwss.power_down(dc);
- dc->hwss.edp_power_control(edp_link, false);
- }
- }
+ if (edp_num)
+ edp_link = edp_links[0];
+
+ if (edp_link && edp_link->link_enc->funcs->is_dig_enabled &&
+ edp_link->link_enc->funcs->is_dig_enabled(edp_link->link_enc) &&
+ dc->hwseq->funcs.edp_backlight_control &&
+ dc->hwss.power_down &&
+ dc->hwss.edp_power_control) {
+ dc->hwseq->funcs.edp_backlight_control(edp_link, false);
+ dc->hwss.power_down(dc);
+ dc->hwss.edp_power_control(edp_link, false);
} else {
for (i = 0; i < dc->link_count; i++) {
struct dc_link *link = dc->links[i];
diff --git a/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_hwseq.c b/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_hwseq.c
index c68e3a708a33..2e8ab9775fa3 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_hwseq.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_hwseq.c
@@ -580,22 +580,19 @@ void dcn30_init_hw(struct dc *dc)
*/
if (dc->config.power_down_display_on_boot) {
struct dc_link *edp_links[MAX_NUM_EDP];
- struct dc_link *edp_link;
+ struct dc_link *edp_link = NULL;

get_edp_links(dc, edp_links, &edp_num);
- if (edp_num) {
- for (i = 0; i < edp_num; i++) {
- edp_link = edp_links[i];
- if (edp_link->link_enc->funcs->is_dig_enabled &&
- edp_link->link_enc->funcs->is_dig_enabled(edp_link->link_enc) &&
- dc->hwss.edp_backlight_control &&
- dc->hwss.power_down &&
- dc->hwss.edp_power_control) {
- dc->hwss.edp_backlight_control(edp_link, false);
- dc->hwss.power_down(dc);
- dc->hwss.edp_power_control(edp_link, false);
- }
- }
+ if (edp_num)
+ edp_link = edp_links[0];
+ if (edp_link && edp_link->link_enc->funcs->is_dig_enabled &&
+ edp_link->link_enc->funcs->is_dig_enabled(edp_link->link_enc) &&
+ dc->hwss.edp_backlight_control &&
+ dc->hwss.power_down &&
+ dc->hwss.edp_power_control) {
+ dc->hwss.edp_backlight_control(edp_link, false);
+ dc->hwss.power_down(dc);
+ dc->hwss.edp_power_control(edp_link, false);
} else {
for (i = 0; i < dc->link_count; i++) {
struct dc_link *link = dc->links[i];
diff --git a/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hwseq.c b/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hwseq.c
index 8a2119d8ca0d..8189606537c5 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hwseq.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hwseq.c
@@ -226,6 +226,7 @@ void dcn31_init_hw(struct dc *dc)
if (dc->config.power_down_display_on_boot) {
struct dc_link *edp_links[MAX_NUM_EDP];
struct dc_link *edp_link;
+ bool power_down = false;

get_edp_links(dc, edp_links, &edp_num);
if (edp_num) {
@@ -239,9 +240,11 @@ void dcn31_init_hw(struct dc *dc)
dc->hwss.edp_backlight_control(edp_link, false);
dc->hwss.power_down(dc);
dc->hwss.edp_power_control(edp_link, false);
+ power_down = true;
}
}
- } else {
+ }
+ if (!power_down) {
for (i = 0; i < dc->link_count; i++) {
struct dc_link *link = dc->links[i];

--
2.30.2