From 66a4e0ef4343bf03ce50d5813428bc0f2bc5ff36 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Guido=20G=C3=BCnther?= Date: Fri, 26 Jul 2019 15:14:36 +0200 Subject: [PATCH] drm/panel: jh057n00900: Move panel DSI init to enable() MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit If the panel is wrapped in a panel_bridge it gets prepar()ed before the upstream DSI bridge which can cause hangs (e.g. with imx-nwl since clocks are not enabled yet). To avoid this move the panel's first DSI access to enable() so the upstream bridge can prepare the DSI host controller in it's pre_enable(). This is also in line with other panel drivers. Signed-off-by: Guido Günther Reviewed-by: Sam Ravnborg Signed-off-by: Sam Ravnborg Link: https://patchwork.freedesktop.org/patch/msgid/12c3495b234952aafe11980a9e06cfd246134660.1564146727.git.agx@sigxcpu.org --- .../gpu/drm/panel/panel-rocktech-jh057n00900.c | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-) diff --git a/drivers/gpu/drm/panel/panel-rocktech-jh057n00900.c b/drivers/gpu/drm/panel/panel-rocktech-jh057n00900.c index 1274b54f2672..c6b4bfd79fde 100644 --- a/drivers/gpu/drm/panel/panel-rocktech-jh057n00900.c +++ b/drivers/gpu/drm/panel/panel-rocktech-jh057n00900.c @@ -143,6 +143,14 @@ static int jh057n_init_sequence(struct jh057n *ctx) static int jh057n_enable(struct drm_panel *panel) { struct jh057n *ctx = panel_to_jh057n(panel); + int ret; + + ret = jh057n_init_sequence(ctx); + if (ret < 0) { + DRM_DEV_ERROR(ctx->dev, "Panel init sequence failed: %d\n", + ret); + return ret; + } return backlight_enable(ctx->backlight); } @@ -197,13 +205,6 @@ static int jh057n_prepare(struct drm_panel *panel) gpiod_set_value_cansleep(ctx->reset_gpio, 0); msleep(20); - ret = jh057n_init_sequence(ctx); - if (ret < 0) { - DRM_DEV_ERROR(ctx->dev, "Panel init sequence failed: %d\n", - ret); - return ret; - } - ctx->prepared = true; return 0; -- 2.30.2