drm/vc4: dsi: Add correct stop condition to vc4_dsi_encoder_disable iteration

[ Upstream commit 7bcb9c8d0bc9f3cab8ac2634b056c2e6b63945ca ]

vc4_dsi_encoder_disable is partially an open coded version of
drm_bridge_chain_disable, but it missed a termination condition
in the loop for ->disable which meant that no post_disable
calls were made.

Add in the termination clause.

Fixes: 033bfe7538a1 ("drm/vc4: dsi: Fix bridge chain handling")
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Link: https://lore.kernel.org/r/20220613144800.326124-17-maxime@cerno.tech
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/vc4/vc4_dsi.c b/drivers/gpu/drm/vc4/vc4_dsi.c
index 333ea96..b7b2c76 100644 (file)
--- a/drivers/gpu/drm/vc4/vc4_dsi.c
+++ b/drivers/gpu/drm/vc4/vc4_dsi.c
@@ -803,6 +803,9 @@ static void vc4_dsi_encoder_disable(struct drm_encoder *encoder)
        list_for_each_entry_reverse(iter, &dsi->bridge_chain, chain_node) {
                if (iter->funcs->disable)
                        iter->funcs->disable(iter);
+
+               if (iter == dsi->bridge)
+                       break;
        }
 
        vc4_dsi_ulps(dsi, true);