linux-kernel - [RFT PATCH v2 45/48] drm/panel: raydium-rm67191: Don't call unprepare+disable at shutdown

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Message-ID: <20240503143327.RFT.v2.45.Id14188f1a8af7d524751c27c343a5b583ff5361f@changeid>
Date: Fri,  3 May 2024 14:33:26 -0700
From: Douglas Anderson <dianders@...omium.org>
To: dri-devel@...ts.freedesktop.org,
	Maxime Ripard <mripard@...nel.org>
Cc: Linus Walleij <linus.walleij@...aro.org>,
	Chris Morgan <macromorgan@...mail.com>,
	Yuran Pereira <yuran.pereira@...mail.com>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Douglas Anderson <dianders@...omium.org>,
	Robert Chiras <robert.chiras@....com>,
	Daniel Vetter <daniel@...ll.ch>,
	David Airlie <airlied@...il.com>,
	Jessica Zhang <quic_jesszhan@...cinc.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Sam Ravnborg <sam@...nborg.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	linux-kernel@...r.kernel.org
Subject: [RFT PATCH v2 45/48] drm/panel: raydium-rm67191: Don't call unprepare+disable at shutdown

It's the responsibility of a correctly written DRM modeset driver to
call drm_atomic_helper_shutdown() at shutdown time and that should be
disabling / unpreparing the panel if needed. Panel drivers shouldn't
be calling these functions themselves.

A recent effort was made to fix as many DRM modeset drivers as
possible [1] [2] [3] and most drivers are fixed now.

A grep through mainline for compatible strings used by this driver
indicates that it is used by IMX boards. The IMX driver appears to be
correctly calling drm_atomic_helper_shutdown() so we can remove the
calls.

[1] https://lore.kernel.org/r/20230901234015.566018-1-dianders@chromium.org
[2] https://lore.kernel.org/r/20230901234202.566951-1-dianders@chromium.org
[3] https://lore.kernel.org/r/20230921192749.1542462-1-dianders@chromium.org

Cc: Robert Chiras <robert.chiras@....com>
Signed-off-by: Douglas Anderson <dianders@...omium.org>
---

Changes in v2:
- Split removal of prepared/enabled from handling of remove/shutdown.

 drivers/gpu/drm/panel/panel-raydium-rm67191.c | 9 ---------
 1 file changed, 9 deletions(-)

diff --git a/drivers/gpu/drm/panel/panel-raydium-rm67191.c b/drivers/gpu/drm/panel/panel-raydium-rm67191.c
index fa9bf89d3bb5..b2029e035635 100644
--- a/drivers/gpu/drm/panel/panel-raydium-rm67191.c
+++ b/drivers/gpu/drm/panel/panel-raydium-rm67191.c
@@ -612,14 +612,6 @@ static void rad_panel_remove(struct mipi_dsi_device *dsi)
 	drm_panel_remove(&rad->panel);
 }
 
-static void rad_panel_shutdown(struct mipi_dsi_device *dsi)
-{
-	struct rad_panel *rad = mipi_dsi_get_drvdata(dsi);
-
-	drm_panel_disable(&rad->panel);
-	drm_panel_unprepare(&rad->panel);
-}
-
 static const struct of_device_id rad_of_match[] = {
 	{ .compatible = "raydium,rm67191", },
 	{ /* sentinel */ }
@@ -633,7 +625,6 @@ static struct mipi_dsi_driver rad_panel_driver = {
 	},
 	.probe = rad_panel_probe,
 	.remove = rad_panel_remove,
-	.shutdown = rad_panel_shutdown,
 };
 module_mipi_dsi_driver(rad_panel_driver);
 
-- 
2.45.0.rc1.225.g2a3ae87e7f-goog