[PATCH v2 0/9] drm: Switch from dev_err to dev_err_probe for missing DSI host error path

Nícolas F. R. A. Prado
2024-03-01T00:12:23Z

This series changes every occurence of the following pattern:

dsi_host = of_find_mipi_dsi_host_by_node(dsi);
if (!dsi_host) {
dev_err(dev, "failed to find dsi host\n");
return -EPROBE_DEFER;
}

into

dsi_host = of_find_mipi_dsi_host_by_node(dsi);
if (!dsi_host)
return dev_err_probe(dev, -EPROBE_DEFER, "failed to find dsi host\n");

This registers the defer probe reason (so it can later be printed by the
driver core or checked on demand through the devices_deferred file in
debugfs) and prevents errors to be spammed in the kernel log every time
the driver retries to probe, unnecessarily alerting userspace about
something that is a normal part of the boot process.

I have omitted a Fixes: tag in the last patch, for the truly-nt35597
panel, because it predates the dev_err_probe() helper.

Changes in v2:
- Added patches 2 onwards to fix all occurences of this pattern instead
of just for the anx7625 driver
- Link to v1: https://lore.kernel.org/r/20240226-anx7625-defer-log-no-dsi-host-v1-1-242b1af31884@collabora.com

---
Nícolas F. R. A. Prado (9):
drm/bridge: anx7625: Don't log an error when DSI host can't be found
drm/bridge: icn6211: Don't log an error when DSI host can't be found
drm/bridge: lt8912b: Don't log an error when DSI host can't be found
drm/bridge: lt9611: Don't log an error when DSI host can't be found
drm/bridge: lt9611uxc: Don't log an error when DSI host can't be found
drm/bridge: tc358775: Don't log an error when DSI host can't be found
drm/bridge: dpc3433: Don't log an error when DSI host can't be found
drm/panel: novatek-nt35950: Don't log an error when DSI host can't be found
drm/panel: truly-nt35597: Don't log an error when DSI host can't be found

drivers/gpu/drm/bridge/analogix/anx7625.c | 6 ++----
drivers/gpu/drm/bridge/chipone-icn6211.c | 6 ++----
drivers/gpu/drm/bridge/lontium-lt8912b.c | 6 ++----
drivers/gpu/drm/bridge/lontium-lt9611.c | 6 ++----
drivers/gpu/drm/bridge/lontium-lt9611uxc.c | 6 ++----
drivers/gpu/drm/bridge/tc358775.c | 6 ++----
drivers/gpu/drm/bridge/ti-dlpc3433.c | 17 +++++++++--------
drivers/gpu/drm/panel/panel-novatek-nt35950.c | 6 ++----
drivers/gpu/drm/panel/panel-truly-nt35597.c | 6 ++----
9 files changed, 25 insertions(+), 40 deletions(-)
---
base-commit: 2ae0a045e6814c8c1d676d6153c605a65746aa29
change-id: 20240226-anx7625-defer-log-no-dsi-host-c3f9ccbcb287

Best regards,
--
Nícolas F. R. A. Prado <nfraprado@collabora.com>