drm/panel: nv3051d: Hold panel in reset for unprepare

[ Upstream commit 697ebc319b942403a6fee894607fd2cd47cca069 ]

Improve the panel's ability to restore from suspend by holding the
panel in suspend after unprepare.

Fixes: b1d39f0f4264 ("drm/panel: Add NewVision NV3051D MIPI-DSI LCD panel")
Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Reviewed-by: Jessica Zhang <quic_jesszhan@quicinc.com>
Link: https://lore.kernel.org/r/20231117202536.1387815-3-macroalpha82@gmail.com
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20231117202536.1387815-3-macroalpha82@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/panel/panel-newvision-nv3051d.c b/drivers/gpu/drm/panel/panel-newvision-nv3051d.c
index ad98dd9..227937a 100644 (file)
--- a/drivers/gpu/drm/panel/panel-newvision-nv3051d.c
+++ b/drivers/gpu/drm/panel/panel-newvision-nv3051d.c
@@ -261,6 +261,8 @@ static int panel_nv3051d_unprepare(struct drm_panel *panel)
 
        usleep_range(10000, 15000);
 
+       gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+
        regulator_disable(ctx->vdd);
 
        return 0;