linux-kernel - [PATCH v2 0/9] drm: Switch from dev_err to dev_err

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Message-Id: <20240229-anx7625-defer-log-no-dsi-host-v2-0-00506941049a@collabora.com>
Date: Thu, 29 Feb 2024 19:12:06 -0500
From: Nícolas F. R. A. Prado <nfraprado@...labora.com>
To: 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>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, 
 owen <qwt9588@...il.com>, Jagan Teki <jagan@...rulasolutions.com>, 
 Marek Vasut <marex@...x.de>, Adrien Grassein <adrien.grassein@...il.com>, 
 Srinivas Kandagatla <srinivas.kandagatla@...aro.org>, 
 Sam Ravnborg <sam@...nborg.org>, Bjorn Andersson <andersson@...nel.org>, 
 Vinod Koul <vkoul@...nel.org>, 
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, 
 Vinay Simha BN <simhavcs@...il.com>, 
 Christopher Vollo <chris@...ewoutreach.org>, 
 Jessica Zhang <quic_jesszhan@...cinc.com>, 
 Marijn Suijten <marijn.suijten@...ainline.org>, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...ainline.org>
Cc: kernel@...labora.com, dri-devel@...ts.freedesktop.org, 
 linux-kernel@...r.kernel.org, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 
 Nícolas F. R. A. Prado <nfraprado@...labora.com>
Subject: [PATCH v2 0/9] drm: Switch from dev_err to dev_err_probe for
 missing DSI host error path

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@...labora.com>