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drm/panel: jh057n00900: Move panel DSI init to enable() 

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
This commit is contained in:
Guido Günther 2019-07-26 15:14:36 +02:00 committed by Sam Ravnborg
parent 4a6e4ae254
commit 66a4e0ef43
1 changed files with 8 additions and 7 deletions
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15
drivers/gpu/drm/panel/panel-rocktech-jh057n00900.c
View File

@ -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;