drm/panel: sharp-ls043t1le01: Don't call 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

Cc: Werner Johansson <werner.johansson@sonymobile.com>
Cc: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20240604172305.v3.20.I89ee53f7fc2f0806cab318128e5fa927990d830f@changeidSigned-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240604172305.v3.20.I89ee53f7fc2f0806cab318128e5fa927990d830f@changeid

drivers/gpu/drm/panel/panel-sharp-ls043t1le01.c

@@ -267,10 +267,6 @@ static void sharp_nt_panel_remove(struct mipi_dsi_device *dsi)
 	struct sharp_nt_panel *sharp_nt = mipi_dsi_get_drvdata(dsi);
 	int ret;
 
-	ret = drm_panel_disable(&sharp_nt->base);
-	if (ret < 0)
-		dev_err(&dsi->dev, "failed to disable panel: %d\n", ret);
-
 	ret = mipi_dsi_detach(dsi);
 	if (ret < 0)
 		dev_err(&dsi->dev, "failed to detach from DSI host: %d\n", ret);
@@ -278,13 +274,6 @@ static void sharp_nt_panel_remove(struct mipi_dsi_device *dsi)
 	sharp_nt_panel_del(sharp_nt);
 }
 
-static void sharp_nt_panel_shutdown(struct mipi_dsi_device *dsi)
-{
-	struct sharp_nt_panel *sharp_nt = mipi_dsi_get_drvdata(dsi);
-
-	drm_panel_disable(&sharp_nt->base);
-}
-
 static const struct of_device_id sharp_nt_of_match[] = {
 	{ .compatible = "sharp,ls043t1le01-qhd", },
 	{ }
@@ -298,7 +287,6 @@ static struct mipi_dsi_driver sharp_nt_panel_driver = {
 	},
 	.probe = sharp_nt_panel_probe,
 	.remove = sharp_nt_panel_remove,
-	.shutdown = sharp_nt_panel_shutdown,
 };
 module_mipi_dsi_driver(sharp_nt_panel_driver);