diff options
| author | Boris Brezillon <boris.brezillon@collabora.com> | 2019-12-03 17:15:08 +0300 |
|---|---|---|
| committer | Boris Brezillon <boris.brezillon@collabora.com> | 2019-12-09 12:03:01 +0300 |
| commit | 05193dc38197021894b17239fafbd2eb1afe5a45 (patch) | |
| tree | ae8656cacf3a21e180c0a9a920c3d661550032a3 /drivers/gpu/drm/vc4/vc4_dsi.c | |
| parent | 35a61fe9218a9d32a93447bdcca1d0f167cd0433 (diff) | |
| download | linux-05193dc38197021894b17239fafbd2eb1afe5a45.tar.xz | |
drm/bridge: Make the bridge chain a double-linked list
So that each element in the chain can easily access its predecessor.
This will be needed to support bus format negotiation between elements
of the bridge chain.
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191203141515.3597631-5-boris.brezillon@collabora.com
Diffstat (limited to 'drivers/gpu/drm/vc4/vc4_dsi.c')
| -rw-r--r-- | drivers/gpu/drm/vc4/vc4_dsi.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/gpu/drm/vc4/vc4_dsi.c b/drivers/gpu/drm/vc4/vc4_dsi.c index ff81b54ea281..6c5b80ad6154 100644 --- a/drivers/gpu/drm/vc4/vc4_dsi.c +++ b/drivers/gpu/drm/vc4/vc4_dsi.c @@ -499,6 +499,7 @@ struct vc4_dsi { struct mipi_dsi_host dsi_host; struct drm_encoder *encoder; struct drm_bridge *bridge; + struct list_head bridge_chain; void __iomem *regs; @@ -1460,6 +1461,8 @@ static int vc4_dsi_bind(struct device *dev, struct device *master, void *data) GFP_KERNEL); if (!vc4_dsi_encoder) return -ENOMEM; + + INIT_LIST_HEAD(&dsi->bridge_chain); vc4_dsi_encoder->base.type = VC4_ENCODER_TYPE_DSI1; vc4_dsi_encoder->dsi = dsi; dsi->encoder = &vc4_dsi_encoder->base.base; @@ -1610,7 +1613,7 @@ static int vc4_dsi_bind(struct device *dev, struct device *master, void *data) * from our driver, since we need to sequence them within the * encoder's enable/disable paths. */ - dsi->encoder->bridge = NULL; + list_splice(&dsi->encoder->bridge_chain, &dsi->bridge_chain); if (dsi->port == 0) vc4_debugfs_add_regset32(drm, "dsi0_regs", &dsi->regset); @@ -1632,6 +1635,11 @@ static void vc4_dsi_unbind(struct device *dev, struct device *master, if (dsi->bridge) pm_runtime_disable(dev); + /* + * Restore the bridge_chain so the bridge detach procedure can happen + * normally. + */ + list_splice(&dsi->bridge_chain, &dsi->encoder->bridge_chain); vc4_dsi_encoder_destroy(dsi->encoder); if (dsi->port == 1) |