[PATCH 04/11] drm/amd/display: make sure pipe power gating reach requested hw state

[Jasdeep Dhillon]

From: Charlene Liu <Charlene.Liu at amd.com>

[why]
display mapping change will involved pipe power gating on and off.
when doing this too fase, sometimes usbc will have no display.
check HW status, it is still in pipe power gating.

[how]
insert polling HW status to make sure the required state reached.
also add dal registry key handling.

Reviewed-by: Sung joon Kim <Sungjoon.Kim at amd.com>
Acked-by: Jasdeep Dhillon <jdhillon at amd.com>
Signed-off-by: Charlene Liu <Charlene.Liu at amd.com>
---
 .../drm/amd/display/dc/dcn31/dcn31_hwseq.c    | 21 ++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

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 ef72d2b82d64..4be228680909 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hwseq.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hwseq.c
@@ -339,21 +339,31 @@ void dcn31_enable_power_gating_plane(
 {
 	bool force_on = true; /* disable power gating */
 
-	if (enable)
+	if (enable && !hws->ctx->dc->debug.disable_hubp_power_gate)
 		force_on = false;
 
 	/* DCHUBP0/1/2/3/4/5 */
 	REG_UPDATE(DOMAIN0_PG_CONFIG, DOMAIN_POWER_FORCEON, force_on);
+	REG_WAIT(DOMAIN0_PG_STATUS, DOMAIN_PGFSM_PWR_STATUS, force_on, 1, 1000);
 	REG_UPDATE(DOMAIN2_PG_CONFIG, DOMAIN_POWER_FORCEON, force_on);
-
+	REG_WAIT(DOMAIN2_PG_STATUS, DOMAIN_PGFSM_PWR_STATUS, force_on, 1, 1000);
 	/* DPP0/1/2/3/4/5 */
 	REG_UPDATE(DOMAIN1_PG_CONFIG, DOMAIN_POWER_FORCEON, force_on);
+	REG_WAIT(DOMAIN1_PG_STATUS, DOMAIN_PGFSM_PWR_STATUS, force_on, 1, 1000);
 	REG_UPDATE(DOMAIN3_PG_CONFIG, DOMAIN_POWER_FORCEON, force_on);
+	REG_WAIT(DOMAIN3_PG_STATUS, DOMAIN_PGFSM_PWR_STATUS, force_on, 1, 1000);
+
+	force_on = true; /* disable power gating */
+	if (enable && !hws->ctx->dc->debug.disable_dsc_power_gate)
+		force_on = false;
 
 	/* DCS0/1/2/3/4/5 */
 	REG_UPDATE(DOMAIN16_PG_CONFIG, DOMAIN_POWER_FORCEON, force_on);
+	REG_WAIT(DOMAIN16_PG_STATUS, DOMAIN_PGFSM_PWR_STATUS, force_on, 1, 1000);
 	REG_UPDATE(DOMAIN17_PG_CONFIG, DOMAIN_POWER_FORCEON, force_on);
+	REG_WAIT(DOMAIN17_PG_STATUS, DOMAIN_PGFSM_PWR_STATUS, force_on, 1, 1000);
 	REG_UPDATE(DOMAIN18_PG_CONFIG, DOMAIN_POWER_FORCEON, force_on);
+	REG_WAIT(DOMAIN18_PG_STATUS, DOMAIN_PGFSM_PWR_STATUS, force_on, 1, 1000);
 }
 
 void dcn31_update_info_frame(struct pipe_ctx *pipe_ctx)
@@ -419,12 +429,15 @@ void dcn31_hubp_pg_control(struct dce_hwseq *hws, unsigned int hubp_inst, bool p
 {
 	uint32_t power_gate = power_on ? 0 : 1;
 	uint32_t pwr_status = power_on ? 0 : 2;
-
+	uint32_t org_ip_request_cntl;
 	if (hws->ctx->dc->debug.disable_hubp_power_gate)
 		return;
 
 	if (REG(DOMAIN0_PG_CONFIG) == 0)
 		return;
+	REG_GET(DC_IP_REQUEST_CNTL, IP_REQUEST_EN, &org_ip_request_cntl);
+	if (org_ip_request_cntl == 0)
+		REG_SET(DC_IP_REQUEST_CNTL, 0, IP_REQUEST_EN, 1);
 
 	switch (hubp_inst) {
 	case 0:
@@ -447,6 +460,8 @@ void dcn31_hubp_pg_control(struct dce_hwseq *hws, unsigned int hubp_inst, bool p
 		BREAK_TO_DEBUGGER();
 		break;
 	}
+	if (org_ip_request_cntl == 0)
+		REG_SET(DC_IP_REQUEST_CNTL, 0, IP_REQUEST_EN, 0);
 }
 
 int dcn31_init_sys_ctx(struct dce_hwseq *hws, struct dc *dc, struct dc_phy_addr_space_config *pa_config)
-- 
2.25.1