From 65af23b101d74a31598e3588a8f3ccbf3b247337 Mon Sep 17 00:00:00 2001 From: Liu Ying Date: Fri, 13 Oct 2017 11:37:18 +0800 Subject: [PATCH] MLK-16581-1 phy: mixel-lvds: Get PHY clock rate before setting it's rate Due to i.MX8 clock issue, we need to get PHY clock rate before setting it's rate when system resumes back from PM sleep mode, otherwise, we'll fail to set the clock rate. So, this is a workaround and it can be removed when the clock issue is properly fixed. Signed-off-by: Liu Ying --- drivers/phy/phy-mixel-lvds.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/phy/phy-mixel-lvds.c b/drivers/phy/phy-mixel-lvds.c index 824b251020a4..31188884f331 100644 --- a/drivers/phy/phy-mixel-lvds.c +++ b/drivers/phy/phy-mixel-lvds.c @@ -96,6 +96,13 @@ void mixel_phy_lvds_set_phy_speed(struct phy *phy, unsigned long phy_clk_rate) mutex_unlock(&priv->lock); clk_disable_unprepare(priv->phy_clk); + /* + * To workaround setting clock rate failure issue + * when the system resumes back from PM sleep mode, + * we need to get the clock rate before setting it's + * rate, otherwise, setting the clock rate will fail. + */ + clk_get_rate(priv->phy_clk); clk_set_rate(priv->phy_clk, phy_clk_rate); } EXPORT_SYMBOL_GPL(mixel_phy_lvds_set_phy_speed);