[PATCH v4 01/12] drm: exynos: dsi: Restore proper bridge chain order

[Jagan Teki]

From: Marek Szyprowski <m.szyprow...@samsung.com>

Restore the proper bridge chain by finding the previous bridge
in the chain instead of passing NULL.

This establishes a proper bridge chain while attaching downstream
bridges.

v4:
* none

v3:
* new patch

Signed-off-by: Marek Szyprowski <m.szyprow...@samsung.com>
Signed-off-by: Jagan Teki <ja...@amarulasolutions.com>
---
 drivers/gpu/drm/exynos/exynos_drm_dsi.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c 
b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
index ec673223d6b7..e5b1540c4ae4 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
@@ -1428,7 +1428,8 @@ static int exynos_dsi_attach(struct drm_bridge *bridge,
 {
        struct exynos_dsi *dsi = bridge_to_dsi(bridge);
 
-       return drm_bridge_attach(bridge->encoder, dsi->out_bridge, NULL, flags);
+       return drm_bridge_attach(bridge->encoder, dsi->out_bridge, bridge,
+                                flags);
 }
 
 static const struct drm_bridge_funcs exynos_dsi_bridge_funcs = {
@@ -1474,7 +1475,10 @@ static int exynos_dsi_host_attach(struct mipi_dsi_host 
*host,
 
        drm_bridge_add(&dsi->bridge);
 
-       drm_bridge_attach(encoder, &dsi->bridge, NULL, 0);
+       drm_bridge_attach(encoder, &dsi->bridge,
+                         list_first_entry_or_null(&encoder->bridge_chain,
+                                                  struct drm_bridge,
+                                                  chain_node), 0);
 
        /*
         * This is a temporary solution and should be made by more generic way.
-- 
2.25.1