linux-kernel - [PATCH v2] drm/bridge: anx7625: Fix power on delay

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Date:   Wed, 28 Apr 2021 19:51:16 +0800
From:   Hsin-Yi Wang <hsinyi@...omium.org>
To:     Robert Foss <robert.foss@...aro.org>
Cc:     Neil Armstrong <narmstrong@...libre.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, Xin Ji <xji@...logixsemi.com>,
        Sam Ravnborg <sam@...nborg.org>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Jonas Karlman <jonas@...boo.se>
Subject: [PATCH v2] drm/bridge: anx7625: Fix power on delay

>From anx7625 spec, the delay between powering on power supplies and gpio
should be larger than 10ms.

Fixes: 6c744983004e ("drm/bridge: anx7625: disable regulators when power off")
Signed-off-by: Hsin-Yi Wang <hsinyi@...omium.org>
Reviewed-by: Neil Armstrong <narmstrong@...libre.com>
---
v1->v2: Extend sleep range a bit as the regulator on some device takes
more time to be powered on after regulator_enable() is called.
---
 drivers/gpu/drm/bridge/analogix/anx7625.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c
index 23283ba0c4f9..b4e349ca38fe 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.c
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
@@ -893,7 +893,7 @@ static void anx7625_power_on(struct anx7625_data *ctx)
 		usleep_range(2000, 2100);
 	}
 
-	usleep_range(4000, 4100);
+	usleep_range(11000, 12000);
 
 	/* Power on pin enable */
 	gpiod_set_value(ctx->pdata.gpio_p_on, 1);
-- 
2.31.1.498.g6c1eba8ee3d-goog