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@xxxxxxxxx> # Asus TF700T Tested-by: Maxim Schwalm <maxim.schwalm@xxxxxxxxx> #TF700T Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx> --- 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
