[PATCH v5 1/9] clk: mediatek: Disable tuner_en before change PLL rate

[Weiyi Lu]

From: Owen Chen <owen.c...@mediatek.com>

PLLs with tuner_en bit, such as APLL1, need to disable
tuner_en before apply new frequency settings, or the new frequency
settings (pcw) will not be applied.
The tuner_en bit will be disabled during changing PLL rate
and be restored after new settings applied.

Fixes: e2f744a82d725 (clk: mediatek: Add MT2712 clock support)
Cc: <sta...@vger.kernel.org>
Signed-off-by: Owen Chen <owen.c...@mediatek.com>
Signed-off-by: Weiyi Lu <weiyi...@mediatek.com>
---
 drivers/clk/mediatek/clk-pll.c | 48 ++++++++++++++++++++++++----------
 1 file changed, 34 insertions(+), 14 deletions(-)

diff --git a/drivers/clk/mediatek/clk-pll.c b/drivers/clk/mediatek/clk-pll.c
index f54e4015b0b1..18842d660317 100644
--- a/drivers/clk/mediatek/clk-pll.c
+++ b/drivers/clk/mediatek/clk-pll.c
@@ -88,6 +88,32 @@ static unsigned long __mtk_pll_recalc_rate(struct 
mtk_clk_pll *pll, u32 fin,
        return ((unsigned long)vco + postdiv - 1) / postdiv;
 }
 
+static void __mtk_pll_tuner_enable(struct mtk_clk_pll *pll)
+{
+       u32 r;
+
+       if (pll->tuner_en_addr) {
+               r = readl(pll->tuner_en_addr) | BIT(pll->data->tuner_en_bit);
+               writel(r, pll->tuner_en_addr);
+       } else if (pll->tuner_addr) {
+               r = readl(pll->tuner_addr) | AUDPLL_TUNER_EN;
+               writel(r, pll->tuner_addr);
+       }
+}
+
+static void __mtk_pll_tuner_disable(struct mtk_clk_pll *pll)
+{
+       u32 r;
+
+       if (pll->tuner_en_addr) {
+               r = readl(pll->tuner_en_addr) & ~BIT(pll->data->tuner_en_bit);
+               writel(r, pll->tuner_en_addr);
+       } else if (pll->tuner_addr) {
+               r = readl(pll->tuner_addr) & ~AUDPLL_TUNER_EN;
+               writel(r, pll->tuner_addr);
+       }
+}
+
 static void mtk_pll_set_rate_regs(struct mtk_clk_pll *pll, u32 pcw,
                int postdiv)
 {
@@ -96,6 +122,9 @@ static void mtk_pll_set_rate_regs(struct mtk_clk_pll *pll, 
u32 pcw,
 
        pll_en = readl(pll->base_addr + REG_CON0) & CON0_BASE_EN;
 
+       /* disable tuner */
+       __mtk_pll_tuner_disable(pll);
+
        /* set postdiv */
        val = readl(pll->pd_addr);
        val &= ~(POSTDIV_MASK << pll->data->pd_shift);
@@ -122,6 +151,9 @@ static void mtk_pll_set_rate_regs(struct mtk_clk_pll *pll, 
u32 pcw,
        if (pll->tuner_addr)
                writel(con1 + 1, pll->tuner_addr);
 
+       /* restore tuner_en */
+       __mtk_pll_tuner_enable(pll);
+
        if (pll_en)
                udelay(20);
 }
@@ -228,13 +260,7 @@ static int mtk_pll_prepare(struct clk_hw *hw)
        r |= pll->data->en_mask;
        writel(r, pll->base_addr + REG_CON0);
 
-       if (pll->tuner_en_addr) {
-               r = readl(pll->tuner_en_addr) | BIT(pll->data->tuner_en_bit);
-               writel(r, pll->tuner_en_addr);
-       } else if (pll->tuner_addr) {
-               r = readl(pll->tuner_addr) | AUDPLL_TUNER_EN;
-               writel(r, pll->tuner_addr);
-       }
+       __mtk_pll_tuner_enable(pll);
 
        udelay(20);
 
@@ -258,13 +284,7 @@ static void mtk_pll_unprepare(struct clk_hw *hw)
                writel(r, pll->base_addr + REG_CON0);
        }
 
-       if (pll->tuner_en_addr) {
-               r = readl(pll->tuner_en_addr) & ~BIT(pll->data->tuner_en_bit);
-               writel(r, pll->tuner_en_addr);
-       } else if (pll->tuner_addr) {
-               r = readl(pll->tuner_addr) & ~AUDPLL_TUNER_EN;
-               writel(r, pll->tuner_addr);
-       }
+       __mtk_pll_tuner_disable(pll);
 
        r = readl(pll->base_addr + REG_CON0);
        r &= ~CON0_BASE_EN;
-- 
2.18.0