diff mbox series

[v2,03/11] clk: mediatek: Disable tuner_en before change PLL rate

Message ID 20181127034254.24721-5-weiyi.lu@mediatek.com (mailing list archive)
State New, archived
Headers show
Series Mediatek MT8183 clock and scpsys support | expand

Commit Message

Weiyi Lu Nov. 27, 2018, 3:42 a.m. UTC 
From: Owen Chen <owen.chen@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.

Signed-off-by: Owen Chen <owen.chen@mediatek.com>
---
 drivers/clk/mediatek/clk-pll.c | 33 +++++++++++++++++++++++++++++++--
 1 file changed, 31 insertions(+), 2 deletions(-)

Comments

Sean Wang Nov. 27, 2018, 8:36 p.m. UTC | #1 
Weiyi Lu <weiyi.lu@mediatek.com> 於 2018年11月26日 週一 下午7:45寫道：
>
> From: Owen Chen <owen.chen@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.

It looks like a bug fix. If so, you should add a fixes tag and even cc
stable tree

>
> Signed-off-by: Owen Chen <owen.chen@mediatek.com>
> ---
>  drivers/clk/mediatek/clk-pll.c | 33 +++++++++++++++++++++++++++++++--
>  1 file changed, 31 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/clk/mediatek/clk-pll.c b/drivers/clk/mediatek/clk-pll.c
> index 1db161aced31..81400601f107 100644
> --- a/drivers/clk/mediatek/clk-pll.c
> +++ b/drivers/clk/mediatek/clk-pll.c
> @@ -27,7 +27,7 @@
>  #define CON0_BASE_EN           BIT(0)
>  #define CON0_PWR_ON            BIT(0)
>  #define CON0_ISO_EN            BIT(1)
> -#define CON0_PCW_CHG           BIT(31)
> +#define CON1_PCW_CHG           BIT(31)

it seems like an unnecessary change

>
>  #define AUDPLL_TUNER_EN                BIT(31)
>
> @@ -97,9 +97,31 @@ static void mtk_pll_set_rate_regs(struct mtk_clk_pll *pll, u32 pcw,
>  {
>         u32 con1, val;
>         int pll_en;
> +       u32 tuner_en = 0;
> +       u32 tuner_en_mask;
> +       void __iomem *tuner_en_addr = NULL;
>
>         pll_en = readl(pll->base_addr + REG_CON0) & CON0_BASE_EN;
>
> +       /* disable tuner */

similar code pieces are ready on mtk_pll_[un]prepare. maybe we can add
common tuner operations for them to reuse.

> +       if (pll->tuner_en_addr) {
> +               tuner_en_addr = pll->tuner_en_addr;
> +               tuner_en_mask = BIT(pll->data->tuner_en_bit);
> +       } else if (pll->tuner_addr) {
> +               tuner_en_addr = pll->tuner_addr;
> +               tuner_en_mask = AUDPLL_TUNER_EN;
> +       }
> +
> +       if (tuner_en_addr) {
> +               val = readl(tuner_en_addr);
> +               tuner_en = val & tuner_en_mask;
> +
> +               if (tuner_en) {
> +                       val &= ~tuner_en_mask;
> +                       writel(val, tuner_en_addr);
> +               }
> +       }
> +
>         /* set postdiv */
>         val = readl(pll->pd_addr);
>         val &= ~(POSTDIV_MASK << pll->data->pd_shift);
> @@ -120,12 +142,19 @@ static void mtk_pll_set_rate_regs(struct mtk_clk_pll *pll, u32 pcw,
>         con1 = readl(pll->base_addr + REG_CON1);
>
>         if (pll_en)
> -               con1 |= CON0_PCW_CHG;
> +               con1 |= CON1_PCW_CHG;
>
>         writel(con1, pll->base_addr + REG_CON1);
>         if (pll->tuner_addr)
>                 writel(con1 + 1, pll->tuner_addr);
>
> +       /* restore tuner_en */
> +       if (tuner_en_addr && tuner_en) {

if (tuner_en) is sufficient

> +               val = readl(tuner_en_addr);
> +               val |= tuner_en_mask;
> +               writel(val, tuner_en_addr);
> +       }
> +
>         if (pll_en)
>                 udelay(20);
>  }
> --
> 2.18.0
>
>
> _______________________________________________
> Linux-mediatek mailing list
> Linux-mediatek@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-mediatek
Nicolas Boichat Nov. 27, 2018, 11:54 p.m. UTC | #2 
On Wed, Nov 28, 2018 at 4:37 AM Sean Wang <sean.wang@kernel.org> wrote:
>
> Weiyi Lu <weiyi.lu@mediatek.com> 於 2018年11月26日 週一 下午7:45寫道：
> >
> > From: Owen Chen <owen.chen@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.
>
> It looks like a bug fix. If so, you should add a fixes tag and even cc
> stable tree
>
> >
> > Signed-off-by: Owen Chen <owen.chen@mediatek.com>
> > ---
> >  drivers/clk/mediatek/clk-pll.c | 33 +++++++++++++++++++++++++++++++--
> >  1 file changed, 31 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/clk/mediatek/clk-pll.c b/drivers/clk/mediatek/clk-pll.c
> > index 1db161aced31..81400601f107 100644
> > --- a/drivers/clk/mediatek/clk-pll.c
> > +++ b/drivers/clk/mediatek/clk-pll.c
> > @@ -27,7 +27,7 @@
> >  #define CON0_BASE_EN           BIT(0)
> >  #define CON0_PWR_ON            BIT(0)
> >  #define CON0_ISO_EN            BIT(1)
> > -#define CON0_PCW_CHG           BIT(31)
> > +#define CON1_PCW_CHG           BIT(31)
>
> it seems like an unnecessary change

Below, you have:
con1 |= CON1_PCW_CHG;

Presumably PCW_CHG is on BIT(31) of CON1(?), so I think this is a good
change. Maybe this needs to be a separate patch, though?

> >
> >  #define AUDPLL_TUNER_EN                BIT(31)
> >
> > @@ -97,9 +97,31 @@ static void mtk_pll_set_rate_regs(struct mtk_clk_pll *pll, u32 pcw,
> >  {
> >         u32 con1, val;
> >         int pll_en;
> > +       u32 tuner_en = 0;
> > +       u32 tuner_en_mask;
> > +       void __iomem *tuner_en_addr = NULL;
> >
> >         pll_en = readl(pll->base_addr + REG_CON0) & CON0_BASE_EN;
> >
> > +       /* disable tuner */
>
> similar code pieces are ready on mtk_pll_[un]prepare. maybe we can add
> common tuner operations for them to reuse.
>
> > +       if (pll->tuner_en_addr) {
> > +               tuner_en_addr = pll->tuner_en_addr;
> > +               tuner_en_mask = BIT(pll->data->tuner_en_bit);
> > +       } else if (pll->tuner_addr) {
> > +               tuner_en_addr = pll->tuner_addr;
> > +               tuner_en_mask = AUDPLL_TUNER_EN;
> > +       }
> > +
> > +       if (tuner_en_addr) {
> > +               val = readl(tuner_en_addr);
> > +               tuner_en = val & tuner_en_mask;
> > +
> > +               if (tuner_en) {
> > +                       val &= ~tuner_en_mask;
> > +                       writel(val, tuner_en_addr);
> > +               }
> > +       }
> > +
> >         /* set postdiv */
> >         val = readl(pll->pd_addr);
> >         val &= ~(POSTDIV_MASK << pll->data->pd_shift);
> > @@ -120,12 +142,19 @@ static void mtk_pll_set_rate_regs(struct mtk_clk_pll *pll, u32 pcw,
> >         con1 = readl(pll->base_addr + REG_CON1);
> >
> >         if (pll_en)
> > -               con1 |= CON0_PCW_CHG;
> > +               con1 |= CON1_PCW_CHG;
> >
> >         writel(con1, pll->base_addr + REG_CON1);
> >         if (pll->tuner_addr)
> >                 writel(con1 + 1, pll->tuner_addr);
> >
> > +       /* restore tuner_en */
> > +       if (tuner_en_addr && tuner_en) {
>
> if (tuner_en) is sufficient
>
> > +               val = readl(tuner_en_addr);
> > +               val |= tuner_en_mask;
> > +               writel(val, tuner_en_addr);
> > +       }
> > +
> >         if (pll_en)
> >                 udelay(20);
> >  }
> > --
> > 2.18.0
> >
> >
> > _______________________________________________
> > Linux-mediatek mailing list
> > Linux-mediatek@lists.infradead.org
> > http://lists.infradead.org/mailman/listinfo/linux-mediatek
Sean Wang Nov. 28, 2018, 12:58 a.m. UTC | #3 
>
> On Wed, Nov 28, 2018 at 4:37 AM Sean Wang <sean.wang@kernel.org> wrote:
> >
> > Weiyi Lu <weiyi.lu@mediatek.com> 於 2018年11月26日 週一 下午7:45寫道：
> > >
> > > From: Owen Chen <owen.chen@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.
> >
> > It looks like a bug fix. If so, you should add a fixes tag and even cc
> > stable tree
> >
> > >
> > > Signed-off-by: Owen Chen <owen.chen@mediatek.com>
> > > ---
> > >  drivers/clk/mediatek/clk-pll.c | 33 +++++++++++++++++++++++++++++++--
> > >  1 file changed, 31 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/drivers/clk/mediatek/clk-pll.c b/drivers/clk/mediatek/clk-pll.c
> > > index 1db161aced31..81400601f107 100644
> > > --- a/drivers/clk/mediatek/clk-pll.c
> > > +++ b/drivers/clk/mediatek/clk-pll.c
> > > @@ -27,7 +27,7 @@
> > >  #define CON0_BASE_EN           BIT(0)
> > >  #define CON0_PWR_ON            BIT(0)
> > >  #define CON0_ISO_EN            BIT(1)
> > > -#define CON0_PCW_CHG           BIT(31)
> > > +#define CON1_PCW_CHG           BIT(31)
> >
> > it seems like an unnecessary change
>
> Below, you have:
> con1 |= CON1_PCW_CHG;
>
> Presumably PCW_CHG is on BIT(31) of CON1(?), so I think this is a good
> change. Maybe this needs to be a separate patch, though?
>

Sure, for me it's not easily understood why the change is necessary
from the description. If it's really another fixup, it should be moved
to a separate patch or add more explanations about that in the same
patch.

> > >
> > >  #define AUDPLL_TUNER_EN                BIT(31)
> > >
> > > @@ -97,9 +97,31 @@ static void mtk_pll_set_rate_regs(struct mtk_clk_pll *pll, u32 pcw,
> > >  {
> > >         u32 con1, val;
> > >         int pll_en;
> > > +       u32 tuner_en = 0;
> > > +       u32 tuner_en_mask;
> > > +       void __iomem *tuner_en_addr = NULL;
> > >
> > >         pll_en = readl(pll->base_addr + REG_CON0) & CON0_BASE_EN;
> > >
> > > +       /* disable tuner */
> >
> > similar code pieces are ready on mtk_pll_[un]prepare. maybe we can add
> > common tuner operations for them to reuse.
> >
> > > +       if (pll->tuner_en_addr) {
> > > +               tuner_en_addr = pll->tuner_en_addr;
> > > +               tuner_en_mask = BIT(pll->data->tuner_en_bit);
> > > +       } else if (pll->tuner_addr) {
> > > +               tuner_en_addr = pll->tuner_addr;
> > > +               tuner_en_mask = AUDPLL_TUNER_EN;
> > > +       }
> > > +
> > > +       if (tuner_en_addr) {
> > > +               val = readl(tuner_en_addr);
> > > +               tuner_en = val & tuner_en_mask;
> > > +
> > > +               if (tuner_en) {
> > > +                       val &= ~tuner_en_mask;
> > > +                       writel(val, tuner_en_addr);
> > > +               }
> > > +       }
> > > +
> > >         /* set postdiv */
> > >         val = readl(pll->pd_addr);
> > >         val &= ~(POSTDIV_MASK << pll->data->pd_shift);
> > > @@ -120,12 +142,19 @@ static void mtk_pll_set_rate_regs(struct mtk_clk_pll *pll, u32 pcw,
> > >         con1 = readl(pll->base_addr + REG_CON1);
> > >
> > >         if (pll_en)
> > > -               con1 |= CON0_PCW_CHG;
> > > +               con1 |= CON1_PCW_CHG;
> > >
> > >         writel(con1, pll->base_addr + REG_CON1);
> > >         if (pll->tuner_addr)
> > >                 writel(con1 + 1, pll->tuner_addr);
> > >
> > > +       /* restore tuner_en */
> > > +       if (tuner_en_addr && tuner_en) {
> >
> > if (tuner_en) is sufficient
> >
> > > +               val = readl(tuner_en_addr);
> > > +               val |= tuner_en_mask;
> > > +               writel(val, tuner_en_addr);
> > > +       }
> > > +
> > >         if (pll_en)
> > >                 udelay(20);
> > >  }
> > > --
> > > 2.18.0
> > >
> > >
> > > _______________________________________________
> > > Linux-mediatek mailing list
> > > Linux-mediatek@lists.infradead.org
> > > http://lists.infradead.org/mailman/listinfo/linux-mediatek
diff mbox series

Patch

diff --git a/drivers/clk/mediatek/clk-pll.c b/drivers/clk/mediatek/clk-pll.c
index 1db161aced31..81400601f107 100644
--- a/drivers/clk/mediatek/clk-pll.c
+++ b/drivers/clk/mediatek/clk-pll.c
@@ -27,7 +27,7 @@ 
 #define CON0_BASE_EN		BIT(0)
 #define CON0_PWR_ON		BIT(0)
 #define CON0_ISO_EN		BIT(1)
-#define CON0_PCW_CHG		BIT(31)
+#define CON1_PCW_CHG		BIT(31)
 
 #define AUDPLL_TUNER_EN		BIT(31)
 
@@ -97,9 +97,31 @@  static void mtk_pll_set_rate_regs(struct mtk_clk_pll *pll, u32 pcw,
 {
 	u32 con1, val;
 	int pll_en;
+	u32 tuner_en = 0;
+	u32 tuner_en_mask;
+	void __iomem *tuner_en_addr = NULL;
 
 	pll_en = readl(pll->base_addr + REG_CON0) & CON0_BASE_EN;
 
+	/* disable tuner */
+	if (pll->tuner_en_addr) {
+		tuner_en_addr = pll->tuner_en_addr;
+		tuner_en_mask = BIT(pll->data->tuner_en_bit);
+	} else if (pll->tuner_addr) {
+		tuner_en_addr = pll->tuner_addr;
+		tuner_en_mask = AUDPLL_TUNER_EN;
+	}
+
+	if (tuner_en_addr) {
+		val = readl(tuner_en_addr);
+		tuner_en = val & tuner_en_mask;
+
+		if (tuner_en) {
+			val &= ~tuner_en_mask;
+			writel(val, tuner_en_addr);
+		}
+	}
+
 	/* set postdiv */
 	val = readl(pll->pd_addr);
 	val &= ~(POSTDIV_MASK << pll->data->pd_shift);
@@ -120,12 +142,19 @@  static void mtk_pll_set_rate_regs(struct mtk_clk_pll *pll, u32 pcw,
 	con1 = readl(pll->base_addr + REG_CON1);
 
 	if (pll_en)
-		con1 |= CON0_PCW_CHG;
+		con1 |= CON1_PCW_CHG;
 
 	writel(con1, pll->base_addr + REG_CON1);
 	if (pll->tuner_addr)
 		writel(con1 + 1, pll->tuner_addr);
 
+	/* restore tuner_en */
+	if (tuner_en_addr && tuner_en) {
+		val = readl(tuner_en_addr);
+		val |= tuner_en_mask;
+		writel(val, tuner_en_addr);
+	}
+
 	if (pll_en)
 		udelay(20);
 }