[PATCH 2/2] drm/amd/display: Check HDMI FRL support before creating polling workqueue

["Timur Kristóf" <timur.kristof@gmail.com>]

The workqueue is not necessary when FRL is not supported or
when it's disabled. Add a helper to tell when the current
board has any HDMI FRL capable connectors and call that
before creating the workqueue.

Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
---
 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c |  2 +-
 drivers/gpu/drm/amd/display/dc/core/dc.c      | 26 +++++++++++++++++++
 drivers/gpu/drm/amd/display/dc/dc.h           |  2 ++
 3 files changed, 29 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 6299f0e384f1..87d7b60ceb3f 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -827,7 +827,7 @@ static int amdgpu_dm_init(struct amdgpu_device *adev)
 
 		dc_init_callbacks(adev->dm.dc, &init_params);
 	}
-	if (adev->dm.dc->caps.max_links > 0) {
+	if (dc_is_hdmi_frl_supported(adev->dm.dc)) {
 		adev->dm.hdmi_frl_status_polling_wq =
 			create_singlethread_workqueue("hdmi_frl_status_polling_wq");
 		if (!adev->dm.hdmi_frl_status_polling_wq)
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index 1b6627a92d24..1a7073abb8ba 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -6592,6 +6592,32 @@ void dc_mclk_switch_using_fw_based_vblank_stretch_shut_down(struct dc *dc)
 		dc->current_state->bw_ctx.bw.dcn.clk.fw_based_mclk_switching_shut_down = true;
 }
 
+/**
+ * dc_is_hdmi_frl_supported() - Check HDMI FRL support
+ *
+ * @dc: [in] dc structure
+ *
+ * Return:
+ * True if the current board has any HDMI FRL capable connectors,
+ * False otherwise.
+ */
+bool dc_is_hdmi_frl_supported(struct dc *dc)
+{
+	int i;
+
+	if (!dc->config.enable_frl)
+		return false;
+
+	for (i = 0; i < dc->link_count; ++i) {
+		if (dc->links[i] &&
+		    dc->links[i]->link_enc &&
+		    dc->links[i]->link_enc->features.flags.bits.IS_HDMI_FRL_CAPABLE)
+			return true;
+	}
+
+	return false;
+}
+
 /**
  * dc_is_dmub_outbox_supported - Check if DMUB firmware support outbox notification
  *
diff --git a/drivers/gpu/drm/amd/display/dc/dc.h b/drivers/gpu/drm/amd/display/dc/dc.h
index 13c1f7cd9d7d..d27c7437ee7a 100644
--- a/drivers/gpu/drm/amd/display/dc/dc.h
+++ b/drivers/gpu/drm/amd/display/dc/dc.h
@@ -3056,6 +3056,8 @@ bool dc_set_ips_disable(struct dc *dc, unsigned int disable_ips);
 void dc_z10_restore(const struct dc *dc);
 void dc_z10_save_init(struct dc *dc);
 
+bool dc_is_hdmi_frl_supported(struct dc *dc);
+
 bool dc_is_dmub_outbox_supported(struct dc *dc);
 bool dc_enable_dmub_notifications(struct dc *dc);
 
-- 
2.55.0