[PATCH 06/22] drm/amd/display: Waiting for 1 frame to fix the flash issue on PSR1

[Alan Liu]

From: Ryan Lin <tsung-hua.lin at amd.com>

[Why]
Needs more frames waiting before the PSR_Exit sending for the specific
TCON.

[How]
Add relock_delay_frame_cnt to control how many frames waiting are needed
before the PSR_Exit sending. The default value is 0. The Driver side can
set this variable for specific TCONs.

Reviewed-by: Robin Chen <robin.chen at amd.com>
Acked-by: Alan Liu <HaoPing.Liu at amd.com>
Signed-off-by: Ryan Lin <tsung-hua.lin at amd.com>
---
 drivers/gpu/drm/amd/display/dc/dce/dmub_psr.c   | 5 +++++
 drivers/gpu/drm/amd/display/dmub/inc/dmub_cmd.h | 6 +++++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dce/dmub_psr.c b/drivers/gpu/drm/amd/display/dc/dce/dmub_psr.c
index cda1592c3a5b..2d3201b77d6a 100644
--- a/drivers/gpu/drm/amd/display/dc/dce/dmub_psr.c
+++ b/drivers/gpu/drm/amd/display/dc/dce/dmub_psr.c
@@ -413,6 +413,11 @@ static bool dmub_psr_copy_settings(struct dmub_psr *dmub,
 	else
 		copy_settings_data->debug.bitfields.force_wakeup_by_tps3 = 0;
 
+	//WA for PSR1 on specific TCON, require frame delay for frame re-lock
+	copy_settings_data->relock_delay_frame_cnt = 0;
+	if (link->dpcd_caps.sink_dev_id == DP_BRANCH_DEVICE_ID_001CF8)
+		copy_settings_data->relock_delay_frame_cnt = 2;
+
 	dc_dmub_srv_cmd_queue(dc->dmub_srv, &cmd);
 	dc_dmub_srv_cmd_execute(dc->dmub_srv);
 	dc_dmub_srv_wait_idle(dc->dmub_srv);
diff --git a/drivers/gpu/drm/amd/display/dmub/inc/dmub_cmd.h b/drivers/gpu/drm/amd/display/dmub/inc/dmub_cmd.h
index 9df330c86a55..34b03bc7f838 100644
--- a/drivers/gpu/drm/amd/display/dmub/inc/dmub_cmd.h
+++ b/drivers/gpu/drm/amd/display/dmub/inc/dmub_cmd.h
@@ -1876,10 +1876,14 @@ struct dmub_cmd_psr_copy_settings_data {
 	 * Use FSM state for PSR power up/down
 	 */
 	uint8_t use_phy_fsm;
+	/**
+	 * frame delay for frame re-lock
+	 */
+	uint8_t relock_delay_frame_cnt;
 	/**
 	 * Explicit padding to 2 byte boundary.
 	 */
-	uint8_t pad3[2];
+	uint8_t pad3;
 };
 
 /**
-- 
2.25.1