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| author | Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> | 2023-11-08 14:27:23 +0300 |
|---|---|---|
| committer | Dmitry Baryshkov <dmitry.baryshkov@linaro.org> | 2024-10-12 11:06:07 +0300 |
| commit | 2d343723c7e1f9f6d64f721f07cfdfc2993758d1 (patch) | |
| tree | 1f0af48f95d1cf2eda70dde7f4b59d34b2776289 /drivers/gpu/drm/bridge | |
| parent | 1b1d5fe66ca591d34c5501aab8f5f09f347e8a3e (diff) | |
| download | linux-2d343723c7e1f9f6d64f721f07cfdfc2993758d1.tar.xz | |
drm/bridge: tc358767: Fix link properties discovery
When a display controller driver uses DRM_BRIDGE_ATTACH_NO_CONNECTOR,
tc358767 will behave properly and skip the creation of the connector.
However, tc_get_display_props(), which is used to find out about the DP
monitor and link, is only called from two places: .atomic_enable() and
tc_connector_get_modes(). The latter is only used when tc358767 creates
its own connector, i.e. when DRM_BRIDGE_ATTACH_NO_CONNECTOR is _not_
set.
Thus, the driver never finds out the link properties before get_edid()
is called. With num_lanes of 0 and link_rate of 0 there are not many
valid modes...
Fix this by adding tc_get_display_props() call at the beginning of
get_edid(), so that we have up to date information before looking at the
modes.
Reported-by: Jan Kiszka <jan.kiszka@siemens.com>
Closes: https://lore.kernel.org/all/24282420-b4dd-45b3-bb1c-fc37fe4a8205@siemens.com/
Fixes: de5e6c027ae6 ("drm/bridge: tc358767: add drm_panel_bridge support")
Reviewed-by: Aradhya Bhatia <a-bhatia1@ti.com>
Tested-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231108-tc358767-v2-2-25c5f70a2159@ideasonboard.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Diffstat (limited to 'drivers/gpu/drm/bridge')
| -rw-r--r-- | drivers/gpu/drm/bridge/tc358767.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c index 159c95b26d33..0c48e747f5b0 100644 --- a/drivers/gpu/drm/bridge/tc358767.c +++ b/drivers/gpu/drm/bridge/tc358767.c @@ -1714,6 +1714,13 @@ static const struct drm_edid *tc_edid_read(struct drm_bridge *bridge, struct drm_connector *connector) { struct tc_data *tc = bridge_to_tc(bridge); + int ret; + + ret = tc_get_display_props(tc); + if (ret < 0) { + dev_err(tc->dev, "failed to read display props: %d\n", ret); + return 0; + } return drm_edid_read_ddc(connector, &tc->aux.ddc); } |