From: Duncan Ma <Duncan.Ma@amd.com>
Date: Fri, 2 May 2025 16:40:48 +0000 (-0400)
Subject: drm/amd/display: Notify DMUB on HW Release
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=a8a21bafa1b964ea566c69152c3299fefcb6c0c5;p=thirdparty%2Fkernel%2Flinux.git

drm/amd/display: Notify DMUB on HW Release

[Why & How]
DMUB shall be notified on driver hardware
release. Implement notification.

Reviewed-by: Duncan Ma <duncan.ma@amd.com>
Signed-off-by: Duncan Ma <Duncan.Ma@amd.com>
Signed-off-by: Ivan Lipski <ivan.lipski@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---

diff --git a/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c b/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c
index c10e603b54afe..b4525b1fc11b0 100644
--- a/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c
+++ b/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c
@@ -2176,3 +2176,20 @@ bool dmub_lsdma_send_poll_reg_write_command(struct dc_dmub_srv *dc_dmub_srv, uin
 	return result;
 }
 
+void dc_dmub_srv_release_hw(const struct dc *dc)
+{
+	struct dc_dmub_srv *dc_dmub_srv = dc->ctx->dmub_srv;
+	union dmub_rb_cmd cmd = {0};
+
+	if (!dc_dmub_srv || !dc_dmub_srv->dmub)
+		return;
+
+	memset(&cmd, 0, sizeof(cmd));
+	cmd.idle_opt_notify_idle.header.type = DMUB_CMD__IDLE_OPT;
+	cmd.idle_opt_notify_idle.header.sub_type = DMUB_CMD__IDLE_OPT_RELEASE_HW;
+	cmd.idle_opt_notify_idle.header.payload_bytes =
+		sizeof(cmd.idle_opt_notify_idle) -
+		sizeof(cmd.idle_opt_notify_idle.header);
+
+	dm_execute_dmub_cmd(dc->ctx, &cmd,  DM_DMUB_WAIT_TYPE_WAIT);
+}
diff --git a/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.h b/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.h
index 1f1c155be30e9..8ea320f212699 100644
--- a/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.h
+++ b/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.h
@@ -291,4 +291,10 @@ bool dc_dmub_srv_ips_query_residency_info(const struct dc_context *ctx, uint8_t
 					  struct dmub_ips_residency_info *driver_info,
 					  enum ips_residency_mode ips_mode);
 
+/**
+ * dc_dmub_srv_release_hw() - Notifies DMUB service that HW access is no longer required.
+ *
+ * @dc - pointer to DC object
+ */
+void dc_dmub_srv_release_hw(const struct dc *dc);
 #endif /* _DMUB_DC_SRV_H_ */