[PATCH 04/16] drm/amd/display: Blank eDP on enable drv if odm enabled

[Hamza Mahfooz]

From: Duncan Ma <duncan.ma at amd.com>

[Why]
For panels with pixel clock > 1200MHz that require ODM
in pre-OS, when driver is disabled in OS, odm is enabled.
Upon driver enablement, corruption is seen if
odm was originally enabled. DP_PIXEL_COMBINE and
pixelclk must be programmed prior to programming the
optc-odm registers. However, eDP displays aren't blanked
prior to initializing odm in this case.

[How]
Upon driver enablement, check whether odm is enabled,
if so, blank eDP prior to programming optc-odm
registers.

Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas at amd.com>
Acked-by: Hamza Mahfooz <hamza.mahfooz at amd.com>
Signed-off-by: Duncan Ma <duncan.ma at amd.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc_link.c | 20 +++++++++++++++++
 drivers/gpu/drm/amd/display/dc/dc.h           |  1 +
 drivers/gpu/drm/amd/display/dc/dc_link.h      |  1 +
 .../drm/amd/display/dc/dcn31/dcn31_hwseq.c    | 22 +++++++++++++++++++
 4 files changed, 44 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
index 55a8f58ee239..818a605dcab1 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
@@ -2126,6 +2126,26 @@ void dc_link_blank_all_dp_displays(struct dc *dc)
 
 }
 
+void dc_link_blank_all_edp_displays(struct dc *dc)
+{
+	unsigned int i;
+	uint8_t dpcd_power_state = '\0';
+	enum dc_status status = DC_ERROR_UNEXPECTED;
+
+	for (i = 0; i < dc->link_count; i++) {
+		if ((dc->links[i]->connector_signal != SIGNAL_TYPE_EDP) ||
+			(!dc->links[i]->edp_sink_present))
+			continue;
+
+		/* if any of the displays are lit up turn them off */
+		status = core_link_read_dpcd(dc->links[i], DP_SET_POWER,
+							&dpcd_power_state, sizeof(dpcd_power_state));
+
+		if (status == DC_OK && dpcd_power_state == DP_POWER_STATE_D0)
+			dc_link_blank_dp_stream(dc->links[i], true);
+	}
+}
+
 void dc_link_blank_dp_stream(struct dc_link *link, bool hw_init)
 {
 	unsigned int j;
diff --git a/drivers/gpu/drm/amd/display/dc/dc.h b/drivers/gpu/drm/amd/display/dc/dc.h
index 11b02a98cf0f..d08550337a09 100644
--- a/drivers/gpu/drm/amd/display/dc/dc.h
+++ b/drivers/gpu/drm/amd/display/dc/dc.h
@@ -202,6 +202,7 @@ struct dc_caps {
 	bool vbios_lttpr_aware;
 	bool vbios_lttpr_enable;
 	uint32_t max_otg_num;
+	bool seamless_odm;
 };
 
 struct dc_bug_wa {
diff --git a/drivers/gpu/drm/amd/display/dc/dc_link.h b/drivers/gpu/drm/amd/display/dc/dc_link.h
index a3c37ee3f849..592b1d473cb6 100644
--- a/drivers/gpu/drm/amd/display/dc/dc_link.h
+++ b/drivers/gpu/drm/amd/display/dc/dc_link.h
@@ -321,6 +321,7 @@ bool dc_link_setup_psr(struct dc_link *dc_link,
 void dc_link_get_psr_residency(const struct dc_link *link, uint32_t *residency);
 
 void dc_link_blank_all_dp_displays(struct dc *dc);
+void dc_link_blank_all_edp_displays(struct dc *dc);
 
 void dc_link_blank_dp_stream(struct dc_link *link, bool hw_init);
 
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 531dd2c65007..55f2e30b8e5a 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hwseq.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hwseq.c
@@ -213,6 +213,28 @@ void dcn31_init_hw(struct dc *dc)
 	 * everything down.
 	 */
 	if (dcb->funcs->is_accelerated_mode(dcb) || !dc->config.seamless_boot_edp_requested) {
+
+		// we want to turn off edp displays if odm is enabled and no seamless boot
+		if (!dc->caps.seamless_odm) {
+			for (i = 0; i < dc->res_pool->timing_generator_count; i++) {
+				struct timing_generator *tg = dc->res_pool->timing_generators[i];
+				uint32_t num_opps, opp_id_src0, opp_id_src1;
+
+				num_opps = 1;
+				if (tg) {
+					if (tg->funcs->is_tg_enabled(tg) && tg->funcs->get_optc_source) {
+						tg->funcs->get_optc_source(tg, &num_opps,
+								&opp_id_src0, &opp_id_src1);
+					}
+				}
+
+				if (num_opps > 1) {
+					dc_link_blank_all_edp_displays(dc);
+					break;
+				}
+			}
+		}
+
 		hws->funcs.init_pipes(dc, dc->current_state);
 		if (dc->res_pool->hubbub->funcs->allow_self_refresh_control)
 			dc->res_pool->hubbub->funcs->allow_self_refresh_control(dc->res_pool->hubbub,
-- 
2.36.1