linux-kernel - [PATCH v1 1/5] drm/bridge: tc358768: Enable reference clock

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Message-Id: <20211002233447.1105-2-digetx@gmail.com>
Date:   Sun,  3 Oct 2021 02:34:43 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Robert Foss <robert.foss@...aro.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Maxim Schwalm <maxim.schwalm@...il.com>,
        Andreas Westman Dorcsak <hedmoo@...oo.com>,
        Peter Ujfalusi <peter.ujfalusi@...com>
Cc:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v1 1/5] drm/bridge: tc358768: Enable reference clock

The driver assumes that reference clock is always-enabled, but this is
hardware-dependent and not true for ASUS Transformer TF700T. Make driver
enable / disable the reference clock.

Tested-by: Andreas Westman Dorcsak <hedmoo@...oo.com> # Asus TF700T
Tested-by: Maxim Schwalm <maxim.schwalm@...il.com> #TF700T
Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/gpu/drm/bridge/tc358768.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/bridge/tc358768.c b/drivers/gpu/drm/bridge/tc358768.c
index a3db532bbdd1..18ae6605a803 100644
--- a/drivers/gpu/drm/bridge/tc358768.c
+++ b/drivers/gpu/drm/bridge/tc358768.c
@@ -237,6 +237,10 @@ static void tc358768_hw_enable(struct tc358768_priv *priv)
 	if (priv->enabled)
 		return;
 
+	ret = clk_prepare_enable(priv->refclk);
+	if (ret < 0)
+		dev_err(priv->dev, "error enabling refclk (%d)\n", ret);
+
 	ret = regulator_bulk_enable(ARRAY_SIZE(priv->supplies), priv->supplies);
 	if (ret < 0)
 		dev_err(priv->dev, "error enabling regulators (%d)\n", ret);
@@ -274,6 +278,8 @@ static void tc358768_hw_disable(struct tc358768_priv *priv)
 	if (ret < 0)
 		dev_err(priv->dev, "error disabling regulators (%d)\n", ret);
 
+	clk_disable_unprepare(priv->refclk);
+
 	priv->enabled = false;
 }
 
-- 
2.32.0