From e183bf31cf0d3a05162e633e428350ed176ce926 Mon Sep 17 00:00:00 2001
From: Douglas Anderson <dianders@chromium.org>
Date: Fri, 30 Jul 2021 08:46:02 -0700
Subject: drm/bridge: ti-sn65dsi86: Add some 100 us delays
Git-commit: e183bf31cf0d3a05162e633e428350ed176ce926
Patch-mainline: v5.15-rc1
References: bsc#1190786
The manual has always said that we need 100 us delays in a few
places. Though it hasn't seemed to be a big deal to skip these, let's
add them in case it makes something happier.
NOTE: this fixes no known issues but it seems good to make it right.
Fixes: a095f15c00e2 ("drm/bridge: add support for sn65dsi86 bridge driver")
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Acked-by: Robert Foss <robert.foss@linaro.org>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20210730084534.v2.3.I842d483139531aa4651da8338512fdf0171ff23c@changeid
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
---
drivers/gpu/drm/bridge/ti-sn65dsi86.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
@@ -306,6 +306,9 @@ static int __maybe_unused ti_sn65dsi86_r
return ret;
}
+ /* td2: min 100 us after regulators before enabling the GPIO */
+ usleep_range(100, 110);
+
gpiod_set_value(pdata->enable_gpio, 1);
/*
@@ -903,6 +906,9 @@ static void ti_sn_bridge_pre_enable(stru
ti_sn65dsi86_enable_comms(pdata);
drm_panel_prepare(pdata->panel);
+
+ /* td7: min 100 us after enable before DSI data */
+ usleep_range(100, 110);
}
static void ti_sn_bridge_post_disable(struct drm_bridge *bridge)