clk: mediatek: Disable tuner_en before change PLL rate

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: <stable@vger.kernel.org>
Signed-off-by: Owen Chen <owen.chen@mediatek.com>
Signed-off-by: Weiyi Lu <weiyi.lu@mediatek.com>
Reviewed-by: James Liao <jamesjj.liao@mediatek.com>
Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

1 files 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;