From a43bb742c54c1ed8cfed20bdea22467ee20f5237 Mon Sep 17 00:00:00 2001 From: Dmitry Osipenko Date: Sun, 3 Oct 2021 02:34:43 +0300 Subject: 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. Upstream-Status: Backport [45a44b01faa6ef92788b2067631deb486cef8a4d] Tested-by: Andreas Westman Dorcsak # Asus TF700T Tested-by: Maxim Schwalm #TF700T Signed-off-by: Dmitry Osipenko Reviewed-by: Robert Foss Signed-off-by: Robert Foss Link: https://patchwork.freedesktop.org/patch/msgid/20211002233447.1105-2-digetx@gmail.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 8ed8302d6bbb..0dd9b3ff14ea 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; } -- cgit v1.2.3