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Date: Sun, 13 Aug 2023 19:11:20 +0200
From: Maxim Schwalm <maxim.schwalm@...il.com>
To: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
Andrzej Hajda <andrzej.hajda@...el.com>,
Neil Armstrong <neil.armstrong@...aro.org>,
Robert Foss <rfoss@...nel.org>,
Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
Jonas Karlman <jonas@...boo.se>,
Jernej Skrabec <jernej.skrabec@...il.com>,
David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>,
Péter Ujfalusi <peter.ujfalusi@...il.com>,
Francesco Dolcini <francesco@...cini.it>
Cc: linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
Aradhya Bhatia <a-bhatia1@...com>,
Dmitry Osipenko <digetx@...il.com>,
Thierry Reding <thierry.reding@...il.com>
Subject: Re: [PATCH 11/11] drm/bridge: tc358768: Add
DRM_BRIDGE_ATTACH_NO_CONNECTOR support
On 04.08.23 12:44, Tomi Valkeinen wrote:
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
> ---
> drivers/gpu/drm/bridge/tc358768.c | 64 +++++++++++++++++++++++++++------------
> 1 file changed, 45 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/tc358768.c b/drivers/gpu/drm/bridge/tc358768.c
> index ea19de5509ed..a567f136ddc7 100644
> --- a/drivers/gpu/drm/bridge/tc358768.c
> +++ b/drivers/gpu/drm/bridge/tc358768.c
> @@ -131,8 +131,17 @@ static const char * const tc358768_supplies[] = {
>
> struct tc358768_dsi_output {
> struct mipi_dsi_device *dev;
> +
> + /* Legacy field if DRM_BRIDGE_ATTACH_NO_CONNECTOR is not used */
> struct drm_panel *panel;
> - struct drm_bridge *bridge;
> +
> + /*
> + * If DRM_BRIDGE_ATTACH_NO_CONNECTOR is not used and a panel is attached
> + * to tc358768, 'next_bridge' contains the bridge the driver created
> + * with drm_panel_bridge_add_typed(). Otherwise 'next_bridge' contains
> + * the next bridge the driver found.
> + */
> + struct drm_bridge *next_bridge;
> };
>
> struct tc358768_priv {
> @@ -391,8 +400,6 @@ static int tc358768_dsi_host_attach(struct mipi_dsi_host *host,
> struct mipi_dsi_device *dev)
> {
> struct tc358768_priv *priv = dsi_host_to_tc358768(host);
> - struct drm_bridge *bridge;
> - struct drm_panel *panel;
> struct device_node *ep;
> int ret;
>
> @@ -420,21 +427,7 @@ static int tc358768_dsi_host_attach(struct mipi_dsi_host *host,
> return -ENOTSUPP;
> }
>
> - ret = drm_of_find_panel_or_bridge(host->dev->of_node, 1, 0, &panel,
> - &bridge);
> - if (ret)
> - return ret;
> -
> - if (panel) {
> - bridge = drm_panel_bridge_add_typed(panel,
> - DRM_MODE_CONNECTOR_DSI);
> - if (IS_ERR(bridge))
> - return PTR_ERR(bridge);
> - }
> -
> priv->output.dev = dev;
> - priv->output.bridge = bridge;
> - priv->output.panel = panel;
>
> priv->dsi_lanes = dev->lanes;
> priv->dsi_bpp = mipi_dsi_pixel_format_to_bpp(dev->format);
> @@ -463,7 +456,7 @@ static int tc358768_dsi_host_detach(struct mipi_dsi_host *host,
>
> drm_bridge_remove(&priv->bridge);
> if (priv->output.panel)
> - drm_panel_bridge_remove(priv->output.bridge);
> + drm_panel_bridge_remove(priv->output.next_bridge);
>
> return 0;
> }
> @@ -544,7 +537,40 @@ static int tc358768_bridge_attach(struct drm_bridge *bridge,
> return -ENOTSUPP;
> }
>
> - return drm_bridge_attach(bridge->encoder, priv->output.bridge, bridge,
> + if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) {
> + struct device_node *node;
> +
> + /* Get the next bridge, connected to port@1. */
> + node = of_graph_get_remote_node(priv->dev->of_node, 1, -1);
> + if (!node)
> + return -ENODEV;
> +
> + priv->output.next_bridge = of_drm_find_bridge(node);
> + of_node_put(node);
> + if (!priv->output.next_bridge)
> + return -EPROBE_DEFER;
> + } else {
> + struct drm_bridge *bridge;
> + struct drm_panel *panel;
> + int ret;
> +
> + ret = drm_of_find_panel_or_bridge(priv->dev->of_node, 1, 0,
> + &panel, &bridge);
> + if (ret)
> + return ret;
> +
> + if (panel) {
> + bridge = drm_panel_bridge_add_typed(panel,
> + DRM_MODE_CONNECTOR_DSI);
> + if (IS_ERR(bridge))
> + return PTR_ERR(bridge);
> + }
> +
> + priv->output.next_bridge = bridge;
> + priv->output.panel = panel;
> + }
> +
> + return drm_bridge_attach(bridge->encoder, priv->output.next_bridge, bridge,
> flags);
> }
>
>
This patch unfortunately breaks the display output on the Asus TF700T:
[drm:drm_bridge_attach] *ERROR* failed to attach bridge /i2c-mux/i2c@...si@7 to encoder LVDS-59: -517
tegra-dc 54200000.dc: failed to initialize RGB output: -517
drm drm: failed to initialize 54200000.dc: -517
------------[ cut here ]------------
WARNING: CPU: 3 PID: 69 at lib/refcount.c:28 tegra_dc_init+0x24/0x5fc
refcount_t: underflow; use-after-free.
Modules linked in: elants_i2c panel_simple tc358768 atkbd vivaldi_fmap
CPU: 3 PID: 69 Comm: kworker/u8:6 Not tainted 6.5.0-rc2-postmarketos-grate #95
Hardware name: NVIDIA Tegra SoC (Flattened Device Tree)
Workqueue: events_unbound deferred_probe_work_func
unwind_backtrace from show_stack+0x10/0x14
show_stack from dump_stack_lvl+0x40/0x4c
dump_stack_lvl from __warn+0x94/0xc0
__warn from warn_slowpath_fmt+0x118/0x16c
warn_slowpath_fmt from tegra_dc_init+0x24/0x5fc
tegra_dc_init from host1x_device_init+0x84/0x15c
host1x_device_init from host1x_drm_probe+0xd8/0x3c4
host1x_drm_probe from really_probe+0xc8/0x2dc
really_probe from __driver_probe_device+0x88/0x19c
__driver_probe_device from driver_probe_device+0x30/0x104
driver_probe_device from __device_attach_driver+0x94/0x108
__device_attach_driver from bus_for_each_drv+0x80/0xb8
bus_for_each_drv from __device_attach+0xa0/0x190
__device_attach from bus_probe_device+0x88/0x8c
bus_probe_device from deferred_probe_work_func+0x78/0xa4
deferred_probe_work_func from process_one_work+0x208/0x420
process_one_work from worker_thread+0x54/0x550
worker_thread from kthread+0xdc/0xf8
kthread from ret_from_fork+0x14/0x2c
Exception stack(0xcf9c5fb0 to 0xcf9c5ff8)
5fa0: 00000000 00000000 00000000 00000000
5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
5fe0: 00000000 00000000 00000000 00000000 00000013 00000000
---[ end trace 0000000000000000 ]---
Best regards,
Maxim
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