linux-kernel - [RFT PATCH v2 25/48] drm/panel: samsung-atna33xc20: Don't call unprepare+disable at shutdown/remove

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Message-ID: <20240503143327.RFT.v2.25.Iaeacccf98e6cb729b8fc3a782725769cd66812ad@changeid>
Date: Fri,  3 May 2024 14:33:06 -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>,
	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 25/48] drm/panel: samsung-atna33xc20: Don't call unprepare+disable at shutdown/remove

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 Qualcomm boards. The Qualcomm 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

Signed-off-by: Douglas Anderson <dianders@...omium.org>
---

Changes in v2:
- Only handle 1 panel per patch.
- Split removal of prepared/enabled from handling of remove/shutdown.

 drivers/gpu/drm/panel/panel-samsung-atna33xc20.c | 12 ------------
 1 file changed, 12 deletions(-)

diff --git a/drivers/gpu/drm/panel/panel-samsung-atna33xc20.c b/drivers/gpu/drm/panel/panel-samsung-atna33xc20.c
index a322dd0a532f..9a482a744b8c 100644
--- a/drivers/gpu/drm/panel/panel-samsung-atna33xc20.c
+++ b/drivers/gpu/drm/panel/panel-samsung-atna33xc20.c
@@ -327,21 +327,10 @@ static void atana33xc20_remove(struct dp_aux_ep_device *aux_ep)
 	struct atana33xc20_panel *panel = dev_get_drvdata(dev);
 
 	drm_panel_remove(&panel->base);
-	drm_panel_disable(&panel->base);
-	drm_panel_unprepare(&panel->base);
 
 	drm_edid_free(panel->drm_edid);
 }
 
-static void atana33xc20_shutdown(struct dp_aux_ep_device *aux_ep)
-{
-	struct device *dev = &aux_ep->dev;
-	struct atana33xc20_panel *panel = dev_get_drvdata(dev);
-
-	drm_panel_disable(&panel->base);
-	drm_panel_unprepare(&panel->base);
-}
-
 static const struct of_device_id atana33xc20_dt_match[] = {
 	{ .compatible = "samsung,atna33xc20", },
 	{ /* sentinal */ }
@@ -362,7 +351,6 @@ static struct dp_aux_ep_driver atana33xc20_driver = {
 	},
 	.probe = atana33xc20_probe,
 	.remove = atana33xc20_remove,
-	.shutdown = atana33xc20_shutdown,
 };
 
 static int __init atana33xc20_init(void)
-- 
2.45.0.rc1.225.g2a3ae87e7f-goog