Without doing anything in unprepare, the HDMI driver isn't able to
switch modes successfully. Calling set_rate with a new rate results
in an un-locked PLL.
If we reset the PLL in unprepare, the PLL is able to lock with the
new rate.
Signed-off-by: Archit Taneja <architt@xxxxxxxxxxxxxx>
---
drivers/gpu/drm/msm/hdmi/hdmi_phy_8996.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/gpu/drm/msm/hdmi/hdmi_phy_8996.c b/drivers/gpu/drm/msm/hdmi/hdmi_phy_8996.c
index 143eab46ba68..1fb7645cc721 100644
--- a/drivers/gpu/drm/msm/hdmi/hdmi_phy_8996.c
+++ b/drivers/gpu/drm/msm/hdmi/hdmi_phy_8996.c
@@ -670,6 +670,11 @@ static unsigned long hdmi_8996_pll_recalc_rate(struct clk_hw *hw,
static void hdmi_8996_pll_unprepare(struct clk_hw *hw)
{
+ struct hdmi_pll_8996 *pll = hw_clk_to_pll(hw);
+ struct hdmi_phy *phy = pll_get_phy(pll);
+
+ hdmi_phy_write(phy, REG_HDMI_8996_PHY_CFG, 0x6);
+ usleep_range(100, 150);
}
static int hdmi_8996_pll_is_enabled(struct clk_hw *hw)
--
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