Patch "drm/amd/display: Exit idle optimizations before HDCP execution" has been added to the 6.9-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    drm/amd/display: Exit idle optimizations before HDCP execution

to the 6.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-amd-display-exit-idle-optimizations-before-hdcp-.patch
and it can be found in the queue-6.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 5ba8662aea142c261e8d93287f9c7be18adae5da
Author: Nicholas Kazlauskas <nicholas.kazlauskas@xxxxxxx>
Date:   Mon Feb 12 16:51:59 2024 -0500

    drm/amd/display: Exit idle optimizations before HDCP execution
    
    [ Upstream commit f30a3bea92bdab398531129d187629fb1d28f598 ]
    
    [WHY]
    PSP can access DCN registers during command submission and we need
    to ensure that DCN is not in PG before doing so.
    
    [HOW]
    Add a callback to DM to lock and notify DC for idle optimization exit.
    It can't be DC directly because of a potential race condition with the
    link protection thread and the rest of DM operation.
    
    Cc: Mario Limonciello <mario.limonciello@xxxxxxx>
    Cc: Alex Deucher <alexander.deucher@xxxxxxx>
    Reviewed-by: Charlene Liu <charlene.liu@xxxxxxx>
    Acked-by: Alex Hung <alex.hung@xxxxxxx>
    Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@xxxxxxx>
    Tested-by: Daniel Wheeler <daniel.wheeler@xxxxxxx>
    Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/gpu/drm/amd/display/modules/hdcp/hdcp.c b/drivers/gpu/drm/amd/display/modules/hdcp/hdcp.c
index 5e01c6e24cbc8..9a5a1726acaf8 100644
--- a/drivers/gpu/drm/amd/display/modules/hdcp/hdcp.c
+++ b/drivers/gpu/drm/amd/display/modules/hdcp/hdcp.c
@@ -88,6 +88,14 @@ static uint8_t is_cp_desired_hdcp2(struct mod_hdcp *hdcp)
 			!hdcp->connection.is_hdcp2_revoked;
 }
 
+static void exit_idle_optimizations(struct mod_hdcp *hdcp)
+{
+	struct mod_hdcp_dm *dm = &hdcp->config.dm;
+
+	if (dm->funcs.exit_idle_optimizations)
+		dm->funcs.exit_idle_optimizations(dm->handle);
+}
+
 static enum mod_hdcp_status execution(struct mod_hdcp *hdcp,
 		struct mod_hdcp_event_context *event_ctx,
 		union mod_hdcp_transition_input *input)
@@ -543,6 +551,8 @@ enum mod_hdcp_status mod_hdcp_process_event(struct mod_hdcp *hdcp,
 	memset(&event_ctx, 0, sizeof(struct mod_hdcp_event_context));
 	event_ctx.event = event;
 
+	exit_idle_optimizations(hdcp);
+
 	/* execute and transition */
 	exec_status = execution(hdcp, &event_ctx, &hdcp->auth.trans_input);
 	trans_status = transition(
diff --git a/drivers/gpu/drm/amd/display/modules/inc/mod_hdcp.h b/drivers/gpu/drm/amd/display/modules/inc/mod_hdcp.h
index a4d344a4db9e1..cdb17b093f2b8 100644
--- a/drivers/gpu/drm/amd/display/modules/inc/mod_hdcp.h
+++ b/drivers/gpu/drm/amd/display/modules/inc/mod_hdcp.h
@@ -156,6 +156,13 @@ struct mod_hdcp_ddc {
 	} funcs;
 };
 
+struct mod_hdcp_dm {
+	void *handle;
+	struct {
+		void (*exit_idle_optimizations)(void *handle);
+	} funcs;
+};
+
 struct mod_hdcp_psp {
 	void *handle;
 	void *funcs;
@@ -272,6 +279,7 @@ struct mod_hdcp_display_query {
 struct mod_hdcp_config {
 	struct mod_hdcp_psp psp;
 	struct mod_hdcp_ddc ddc;
+	struct mod_hdcp_dm dm;
 	uint8_t index;
 };