[PATCH 13/17] drm/amd/display: PSRSU+DSC WA for specific TCON

[David Zhang]

[why]
Some specific TCON chip has HW limitation to support PSRSU+DSC.

[how]
Force ffu mode when DSC enabled if we detect it is the specific
model from sink OUI DPCD. And disable ABM update for this case.

Signed-off-by: David Zhang <dingchen.zhang at amd.com>
---
 drivers/gpu/drm/amd/display/dc/dc_link.h      |  1 +
 drivers/gpu/drm/amd/display/dc/dce/dmub_psr.c | 14 ++++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/dc_link.h b/drivers/gpu/drm/amd/display/dc/dc_link.h
index a3c37ee3f849..0bec986a6de8 100644
--- a/drivers/gpu/drm/amd/display/dc/dc_link.h
+++ b/drivers/gpu/drm/amd/display/dc/dc_link.h
@@ -108,6 +108,7 @@ struct psr_settings {
 	 */
 	bool psr_frame_capture_indication_req;
 	unsigned int psr_sdp_transmit_line_num_deadline;
+	uint8_t force_ffu_mode;
 	unsigned int psr_power_opt;
 };
 
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 e784002fe312..9ca0cbb0af9b 100644
--- a/drivers/gpu/drm/amd/display/dc/dce/dmub_psr.c
+++ b/drivers/gpu/drm/amd/display/dc/dce/dmub_psr.c
@@ -349,6 +349,7 @@ static bool dmub_psr_copy_settings(struct dmub_psr *dmub,
 	copy_settings_data->debug.u32All = 0;
 	copy_settings_data->debug.bitfields.visual_confirm	= dc->dc->debug.visual_confirm == VISUAL_CONFIRM_PSR;
 	copy_settings_data->debug.bitfields.use_hw_lock_mgr		= 1;
+	copy_settings_data->debug.bitfields.force_full_frame_update	= 0;
 
 	if (psr_context->su_granularity_required == 0)
 		copy_settings_data->su_y_granularity = 0;
@@ -363,6 +364,19 @@ static bool dmub_psr_copy_settings(struct dmub_psr *dmub,
 	copy_settings_data->panel_inst = panel_inst;
 	copy_settings_data->dsc_enable_status = (pipe_ctx->stream->timing.flags.DSC == 1);
 
+	/**
+	 * WA for PSRSU+DSC on specific TCON, if DSC is enabled, force PSRSU as ffu mode(full frame update)
+	 * Note that PSRSU+DSC is still under development.
+	 */
+	if (copy_settings_data->dsc_enable_status &&
+		link->dpcd_caps.sink_dev_id == DP_DEVICE_ID_38EC11 &&
+		!memcmp(link->dpcd_caps.sink_dev_id_str, DP_SINK_DEVICE_STR_ID_1,
+			sizeof(link->dpcd_caps.sink_dev_id_str)))
+		link->psr_settings.force_ffu_mode = 1;
+	else
+		link->psr_settings.force_ffu_mode = 0;
+	copy_settings_data->force_ffu_mode = link->psr_settings.force_ffu_mode;
+
 	if (link->fec_state == dc_link_fec_enabled &&
 		(!memcmp(link->dpcd_caps.sink_dev_id_str, DP_SINK_DEVICE_STR_ID_1,
 			sizeof(link->dpcd_caps.sink_dev_id_str)) ||
-- 
2.25.1