From: Fangzhi Zuo <Jerry.Zuo@xxxxxxx>
DSC sequence for non virtual dpcd synaptics hub
Reviewed-by: Hersen Wu <hersenxs.wu@xxxxxxx>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@xxxxxxx>
Signed-off-by: Fangzhi Zuo <Jerry.Zuo@xxxxxxx>
---
.../amd/display/amdgpu_dm/amdgpu_dm_helpers.c | 48 +++++++++++++++++++
.../amd/display/include/ddc_service_types.h | 3 ++
2 files changed, 51 insertions(+)
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
index b760c0b199d5..32fbd3902e93 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
@@ -39,6 +39,7 @@
#include "amdgpu_dm_mst_types.h"
#include "dm_helpers.h"
+#include "ddc_service_types.h"
struct monitor_patch_info {
unsigned int manufacturer_id;
@@ -537,6 +538,7 @@ bool dm_helpers_submit_i2c(
return result;
}
+#if defined(CONFIG_DRM_AMD_DC_DCN)
static bool execute_synatpics_rc_command(struct drm_dp_aux *aux,
bool is_write_cmd,
unsigned char cmd,
@@ -669,6 +671,43 @@ static void apply_synaptics_fifo_reset_wa(struct drm_dp_aux *aux)
DC_LOG_DC("Done apply_synaptics_fifo_reset_wa\n");
}
+static uint8_t write_dsc_enable_synaptics_non_virtual_dpcd_mst(
+ struct drm_dp_aux *aux,
+ const struct dc_stream_state *stream,
+ bool enable)
+{
+ uint8_t ret = 0;
+
+ DC_LOG_DC("Configure DSC to non-virtual dpcd synaptics\n");
+
+ if (enable) {
+ /* When DSC is enabled on previous boot and reboot with the hub,
+ * there is a chance that Synaptics hub gets stuck during reboot sequence.
+ * Applying a workaround to reset Synaptics SDP fifo before enabling the first stream
+ */
+ if (!stream->link->link_status.link_active &&
+ memcmp(stream->link->dpcd_caps.branch_dev_name,
+ (int8_t *)SYNAPTICS_DEVICE_ID, 4) == 0)
+ apply_synaptics_fifo_reset_wa(aux);
+
+ ret = drm_dp_dpcd_write(aux, DP_DSC_ENABLE, &enable, 1);
+ DRM_INFO("Send DSC enable to synaptics\n");
+
+ } else {
+ /* Synaptics hub not support virtual dpcd,
+ * external monitor occur garbage while disable DSC,
+ * Disable DSC only when entire link status turn to false,
+ */
+ if (!stream->link->link_status.link_active) {
+ ret = drm_dp_dpcd_write(aux, DP_DSC_ENABLE, &enable, 1);
+ DRM_INFO("Send DSC disable to synaptics\n");
+ }
+ }
+
+ return ret;
+}
+#endif
+
bool dm_helpers_dp_write_dsc_enable(
struct dc_context *ctx,
const struct dc_stream_state *stream,
@@ -687,7 +726,16 @@ bool dm_helpers_dp_write_dsc_enable(
if (!aconnector->dsc_aux)
return false;
+#if defined(CONFIG_DRM_AMD_DC_DCN)
+ // apply w/a to synaptics
+ if (needs_dsc_aux_workaround(aconnector->dc_link) &&
+ (aconnector->mst_downstream_port_present.byte & 0x7) != 0x3)
+ return write_dsc_enable_synaptics_non_virtual_dpcd_mst(
+ aconnector->dsc_aux, stream, enable_dsc);
+#endif
+
ret = drm_dp_dpcd_write(aconnector->dsc_aux, DP_DSC_ENABLE, &enable_dsc, 1);
+ DC_LOG_DC("Send DSC %s to MST RX\n", enable_dsc ? "enable" : "disable");
}
if (stream->signal == SIGNAL_TYPE_DISPLAY_PORT || stream->signal == SIGNAL_TYPE_EDP) {
diff --git a/drivers/gpu/drm/amd/display/include/ddc_service_types.h b/drivers/gpu/drm/amd/display/include/ddc_service_types.h
index 57f92bd2814f..fb289a5c873a 100644
--- a/drivers/gpu/drm/amd/display/include/ddc_service_types.h
+++ b/drivers/gpu/drm/amd/display/include/ddc_service_types.h
@@ -123,4 +123,7 @@ struct av_sync_data {
static const uint8_t DP_SINK_DEVICE_STR_ID_1[] = {7, 1, 8, 7, 3, 0};
static const uint8_t DP_SINK_DEVICE_STR_ID_2[] = {7, 1, 8, 7, 5, 0};
+/*MST Dock*/
+static const uint8_t SYNAPTICS_DEVICE_ID[] = "SYNA";
+
#endif /* __DAL_DDC_SERVICE_TYPES_H__ */
--
2.25.1
