linux-kernel - [RFC PATCH 4/8] drm/panel: nv3052c: Wait before entering sleep mode

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Date:   Mon, 11 Sep 2023 19:02:02 +1000
From:   John Watts <contact@...kia.org>
To:     dri-devel@...ts.freedesktop.org
Cc:     Neil Armstrong <neil.armstrong@...aro.org>,
        Sam Ravnborg <sam@...nborg.org>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Shawn Guo <shawnguo@...nel.org>,
        Chris Morgan <macromorgan@...mail.com>,
        Jagan Teki <jagan@...eble.ai>, John Watts <contact@...kia.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH 4/8] drm/panel: nv3052c: Wait before entering sleep mode

The panel needs us to wait 120ms between exiting and entering sleep.
Guarantee that by always waiting 150ms before entering sleep mode.

Signed-off-by: John Watts <contact@...kia.org>
---
 drivers/gpu/drm/panel/panel-newvision-nv3052c.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-newvision-nv3052c.c b/drivers/gpu/drm/panel/panel-newvision-nv3052c.c
index 2526b123b1f5..307335d0f1fc 100644
--- a/drivers/gpu/drm/panel/panel-newvision-nv3052c.c
+++ b/drivers/gpu/drm/panel/panel-newvision-nv3052c.c
@@ -289,6 +289,9 @@ static int nv3052c_unprepare(struct drm_panel *panel)
 	struct mipi_dbi *dbi = &priv->dbi;
 	int err;
 
+	/* Wait 150ms in case we just exited sleep mode */
+	msleep(150);
+
 	err = mipi_dbi_command(dbi, MIPI_DCS_ENTER_SLEEP_MODE);
 	if (err)
 		dev_err(priv->dev, "Unable to enter sleep mode: %d\n", err);
-- 
2.42.0