linux-kernel - [PATCH] drm/bridge: ti-sn65dsi83: Fix delay after reset deassert to match spec

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Message-Id: <20221122081219.20143-1-frieder@fris.de>
Date:   Tue, 22 Nov 2022 09:12:18 +0100
From:   Frieder Schrempf <frieder@...s.de>
To:     Andrzej Hajda <andrzej.hajda@...el.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...il.com>,
        dri-devel@...ts.freedesktop.org,
        Frieder Schrempf <frieder.schrempf@...tron.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-kernel@...r.kernel.org, Marek Vasut <marex@...x.de>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <robert.foss@...aro.org>
Cc:     Alexander Stein <alexander.stein@...tq-group.com>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Jonas Karlman <jonas@...boo.se>,
        José Expósito <jose.exposito89@...il.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Sam Ravnborg <sam@...nborg.org>,
        Ville Syrjälä 
        <ville.syrjala@...ux.intel.com>
Subject: [PATCH] drm/bridge: ti-sn65dsi83: Fix delay after reset deassert to match spec

From: Frieder Schrempf <frieder.schrempf@...tron.de>

The datasheet specifies a delay of 10 milliseconds, but the current
driver only waits for 1 ms. Fix this to make sure the initialization
sequence meets the spec.

Fixes: ceb515ba29ba ("drm/bridge: ti-sn65dsi83: Add TI SN65DSI83 and SN65DSI84 driver")
Signed-off-by: Frieder Schrempf <frieder.schrempf@...tron.de>
---
 drivers/gpu/drm/bridge/ti-sn65dsi83.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi83.c b/drivers/gpu/drm/bridge/ti-sn65dsi83.c
index 7ba9467fff12..047c14ddbbf1 100644
--- a/drivers/gpu/drm/bridge/ti-sn65dsi83.c
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi83.c
@@ -346,7 +346,7 @@ static void sn65dsi83_atomic_enable(struct drm_bridge *bridge,
 
 	/* Deassert reset */
 	gpiod_set_value_cansleep(ctx->enable_gpio, 1);
-	usleep_range(1000, 1100);
+	usleep_range(10000, 11000);
 
 	/* Get the LVDS format from the bridge state. */
 	bridge_state = drm_atomic_get_new_bridge_state(state, bridge);
-- 
2.38.1