From 66a4e0ef4343bf03ce50d5813428bc0f2bc5ff36 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Guido=20G=C3=BCnther?= <agx@sigxcpu.org>
Date: Fri, 26 Jul 2019 15:14:36 +0200
Subject: drm/panel: jh057n00900: Move panel DSI init to enable()
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Git-commit: 66a4e0ef4343bf03ce50d5813428bc0f2bc5ff36
Patch-mainline: v5.4-rc1
References: bsc#1152472
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 <agx@sigxcpu.org>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/12c3495b234952aafe11980a9e06cfd246134660.1564146727.git.agx@sigxcpu.org
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
---
.../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;
--
2.28.0