diff mbox series

[v5,3/9] clk: mediatek: Add configurable pcwibits and fmin to mtk_pll_data

Message ID 20190305050546.23431-5-weiyi.lu@mediatek.com (mailing list archive)
State New, archived
Headers show
Series Mediatek MT8183 clock support | expand

Commit Message

Weiyi Lu March 5, 2019, 5:05 a.m. UTC 
From: Owen Chen <owen.chen@mediatek.com>

1. pcwibits: The integer bits of pcw for plls is extend to 8 bits,
   add a variable to indicate this change and
   backward-compatible.
2. fmin: The pll freqency lower-bound is vary from 1GMhz to
   1.5Ghz, add a variable to indicate platform-dependent.

Signed-off-by: Owen Chen <owen.chen@mediatek.com>
Signed-off-by: Weiyi Lu <weiyi.lu@mediatek.com>
Acked-by: Sean Wang <sean.wang@kernel.org>
---
 drivers/clk/mediatek/clk-mtk.h |  2 ++
 drivers/clk/mediatek/clk-pll.c | 15 +++++++++++----
 2 files changed, 13 insertions(+), 4 deletions(-)

Comments

James Liao March 5, 2019, 6:46 a.m. UTC | #1 
On Tue, 2019-03-05 at 13:05 +0800, Weiyi Lu wrote:
> From: Owen Chen <owen.chen@mediatek.com>
> 
> 1. pcwibits: The integer bits of pcw for plls is extend to 8 bits,
>    add a variable to indicate this change and
>    backward-compatible.
> 2. fmin: The pll freqency lower-bound is vary from 1GMhz to
>    1.5Ghz, add a variable to indicate platform-dependent.
> 
> Signed-off-by: Owen Chen <owen.chen@mediatek.com>
> Signed-off-by: Weiyi Lu <weiyi.lu@mediatek.com>
> Acked-by: Sean Wang <sean.wang@kernel.org>

Reviewed-by: James Liao <jamesjj.liao@mediatek.com>

> ---
>  drivers/clk/mediatek/clk-mtk.h |  2 ++
>  drivers/clk/mediatek/clk-pll.c | 15 +++++++++++----
>  2 files changed, 13 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/clk/mediatek/clk-mtk.h b/drivers/clk/mediatek/clk-mtk.h
> index f83c2bbb677e..11b5517903d0 100644
> --- a/drivers/clk/mediatek/clk-mtk.h
> +++ b/drivers/clk/mediatek/clk-mtk.h
> @@ -214,8 +214,10 @@ struct mtk_pll_data {
>  	unsigned int flags;
>  	const struct clk_ops *ops;
>  	u32 rst_bar_mask;
> +	unsigned long fmin;
>  	unsigned long fmax;
>  	int pcwbits;
> +	int pcwibits;
>  	uint32_t pcw_reg;
>  	int pcw_shift;
>  	const struct mtk_pll_div_table *div_table;
> diff --git a/drivers/clk/mediatek/clk-pll.c b/drivers/clk/mediatek/clk-pll.c
> index 18842d660317..67aaa3082d9b 100644
> --- a/drivers/clk/mediatek/clk-pll.c
> +++ b/drivers/clk/mediatek/clk-pll.c
> @@ -32,6 +32,8 @@
>  #define AUDPLL_TUNER_EN		BIT(31)
>  
>  #define POSTDIV_MASK		0x7
> +
> +/* default 7 bits integer, can be overridden with pcwibits. */
>  #define INTEGER_BITS		7
>  
>  /*
> @@ -68,12 +70,15 @@ static unsigned long __mtk_pll_recalc_rate(struct mtk_clk_pll *pll, u32 fin,
>  		u32 pcw, int postdiv)
>  {
>  	int pcwbits = pll->data->pcwbits;
> -	int pcwfbits;
> +	int pcwfbits = 0;
> +	int ibits;
>  	u64 vco;
>  	u8 c = 0;
>  
>  	/* The fractional part of the PLL divider. */
> -	pcwfbits = pcwbits > INTEGER_BITS ? pcwbits - INTEGER_BITS : 0;
> +	ibits = pll->data->pcwibits ? pll->data->pcwibits : INTEGER_BITS;
> +	if (pcwbits > ibits)
> +		pcwfbits = pcwbits - ibits;
>  
>  	vco = (u64)fin * pcw;
>  
> @@ -170,9 +175,10 @@ static void mtk_pll_set_rate_regs(struct mtk_clk_pll *pll, u32 pcw,
>  static void mtk_pll_calc_values(struct mtk_clk_pll *pll, u32 *pcw, u32 *postdiv,
>  		u32 freq, u32 fin)
>  {
> -	unsigned long fmin = 1000 * MHZ;
> +	unsigned long fmin = pll->data->fmin ? pll->data->fmin : (1000 * MHZ);
>  	const struct mtk_pll_div_table *div_table = pll->data->div_table;
>  	u64 _pcw;
> +	int ibits;
>  	u32 val;
>  
>  	if (freq > pll->data->fmax)
> @@ -196,7 +202,8 @@ static void mtk_pll_calc_values(struct mtk_clk_pll *pll, u32 *pcw, u32 *postdiv,
>  	}
>  
>  	/* _pcw = freq * postdiv / fin * 2^pcwfbits */
> -	_pcw = ((u64)freq << val) << (pll->data->pcwbits - INTEGER_BITS);
> +	ibits = pll->data->pcwibits ? pll->data->pcwibits : INTEGER_BITS;
> +	_pcw = ((u64)freq << val) << (pll->data->pcwbits - ibits);
>  	do_div(_pcw, fin);
>  
>  	*pcw = (u32)_pcw;
Nicolas Boichat March 8, 2019, 6:20 a.m. UTC | #2 
On Tue, Mar 5, 2019 at 1:06 PM Weiyi Lu <weiyi.lu@mediatek.com> wrote:
>
> From: Owen Chen <owen.chen@mediatek.com>
>
> 1. pcwibits: The integer bits of pcw for plls is extend to 8 bits,
>    add a variable to indicate this change and
>    backward-compatible.
> 2. fmin: The pll freqency lower-bound is vary from 1GMhz to

Minor nit: frequency (Stephen I guess you could fix that when applying...)

>    1.5Ghz, add a variable to indicate platform-dependent.
>
> Signed-off-by: Owen Chen <owen.chen@mediatek.com>
> Signed-off-by: Weiyi Lu <weiyi.lu@mediatek.com>
> Acked-by: Sean Wang <sean.wang@kernel.org>

Reviewed-and-tested-by: Nicolas Boichat <drinkcat@chromium.org>

> ---
>  drivers/clk/mediatek/clk-mtk.h |  2 ++
>  drivers/clk/mediatek/clk-pll.c | 15 +++++++++++----
>  2 files changed, 13 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/clk/mediatek/clk-mtk.h b/drivers/clk/mediatek/clk-mtk.h
> index f83c2bbb677e..11b5517903d0 100644
> --- a/drivers/clk/mediatek/clk-mtk.h
> +++ b/drivers/clk/mediatek/clk-mtk.h
> @@ -214,8 +214,10 @@ struct mtk_pll_data {
>         unsigned int flags;
>         const struct clk_ops *ops;
>         u32 rst_bar_mask;
> +       unsigned long fmin;
>         unsigned long fmax;
>         int pcwbits;
> +       int pcwibits;
>         uint32_t pcw_reg;
>         int pcw_shift;
>         const struct mtk_pll_div_table *div_table;
> diff --git a/drivers/clk/mediatek/clk-pll.c b/drivers/clk/mediatek/clk-pll.c
> index 18842d660317..67aaa3082d9b 100644
> --- a/drivers/clk/mediatek/clk-pll.c
> +++ b/drivers/clk/mediatek/clk-pll.c
> @@ -32,6 +32,8 @@
>  #define AUDPLL_TUNER_EN                BIT(31)
>
>  #define POSTDIV_MASK           0x7
> +
> +/* default 7 bits integer, can be overridden with pcwibits. */
>  #define INTEGER_BITS           7
>
>  /*
> @@ -68,12 +70,15 @@ static unsigned long __mtk_pll_recalc_rate(struct mtk_clk_pll *pll, u32 fin,
>                 u32 pcw, int postdiv)
>  {
>         int pcwbits = pll->data->pcwbits;
> -       int pcwfbits;
> +       int pcwfbits = 0;
> +       int ibits;
>         u64 vco;
>         u8 c = 0;
>
>         /* The fractional part of the PLL divider. */
> -       pcwfbits = pcwbits > INTEGER_BITS ? pcwbits - INTEGER_BITS : 0;
> +       ibits = pll->data->pcwibits ? pll->data->pcwibits : INTEGER_BITS;
> +       if (pcwbits > ibits)
> +               pcwfbits = pcwbits - ibits;
>
>         vco = (u64)fin * pcw;
>
> @@ -170,9 +175,10 @@ static void mtk_pll_set_rate_regs(struct mtk_clk_pll *pll, u32 pcw,
>  static void mtk_pll_calc_values(struct mtk_clk_pll *pll, u32 *pcw, u32 *postdiv,
>                 u32 freq, u32 fin)
>  {
> -       unsigned long fmin = 1000 * MHZ;
> +       unsigned long fmin = pll->data->fmin ? pll->data->fmin : (1000 * MHZ);
>         const struct mtk_pll_div_table *div_table = pll->data->div_table;
>         u64 _pcw;
> +       int ibits;
>         u32 val;
>
>         if (freq > pll->data->fmax)
> @@ -196,7 +202,8 @@ static void mtk_pll_calc_values(struct mtk_clk_pll *pll, u32 *pcw, u32 *postdiv,
>         }
>
>         /* _pcw = freq * postdiv / fin * 2^pcwfbits */
> -       _pcw = ((u64)freq << val) << (pll->data->pcwbits - INTEGER_BITS);
> +       ibits = pll->data->pcwibits ? pll->data->pcwibits : INTEGER_BITS;
> +       _pcw = ((u64)freq << val) << (pll->data->pcwbits - ibits);
>         do_div(_pcw, fin);
>
>         *pcw = (u32)_pcw;
> --
> 2.18.0
>
Stephen Boyd April 11, 2019, 8:14 p.m. UTC | #3 
Quoting Nicolas Boichat (2019-03-07 22:20:27)
> On Tue, Mar 5, 2019 at 1:06 PM Weiyi Lu <weiyi.lu@mediatek.com> wrote:
> >
> > From: Owen Chen <owen.chen@mediatek.com>
> >
> > 1. pcwibits: The integer bits of pcw for plls is extend to 8 bits,
> >    add a variable to indicate this change and
> >    backward-compatible.
> > 2. fmin: The pll freqency lower-bound is vary from 1GMhz to
> 
> Minor nit: frequency (Stephen I guess you could fix that when applying...)

What's a 1GMhz? Anyway, fixed the typo.
Stephen Boyd April 11, 2019, 8:16 p.m. UTC | #4 
Quoting Weiyi Lu (2019-03-04 21:05:40)
> From: Owen Chen <owen.chen@mediatek.com>
> 
> 1. pcwibits: The integer bits of pcw for plls is extend to 8 bits,
>    add a variable to indicate this change and
>    backward-compatible.
> 2. fmin: The pll freqency lower-bound is vary from 1GMhz to
>    1.5Ghz, add a variable to indicate platform-dependent.
> 
> Signed-off-by: Owen Chen <owen.chen@mediatek.com>
> Signed-off-by: Weiyi Lu <weiyi.lu@mediatek.com>
> Acked-by: Sean Wang <sean.wang@kernel.org>
> ---

Applied to clk-next
diff mbox series

Patch

diff --git a/drivers/clk/mediatek/clk-mtk.h b/drivers/clk/mediatek/clk-mtk.h
index f83c2bbb677e..11b5517903d0 100644
--- a/drivers/clk/mediatek/clk-mtk.h
+++ b/drivers/clk/mediatek/clk-mtk.h
@@ -214,8 +214,10 @@  struct mtk_pll_data {
 	unsigned int flags;
 	const struct clk_ops *ops;
 	u32 rst_bar_mask;
+	unsigned long fmin;
 	unsigned long fmax;
 	int pcwbits;
+	int pcwibits;
 	uint32_t pcw_reg;
 	int pcw_shift;
 	const struct mtk_pll_div_table *div_table;
diff --git a/drivers/clk/mediatek/clk-pll.c b/drivers/clk/mediatek/clk-pll.c
index 18842d660317..67aaa3082d9b 100644
--- a/drivers/clk/mediatek/clk-pll.c
+++ b/drivers/clk/mediatek/clk-pll.c
@@ -32,6 +32,8 @@ 
 #define AUDPLL_TUNER_EN		BIT(31)
 
 #define POSTDIV_MASK		0x7
+
+/* default 7 bits integer, can be overridden with pcwibits. */
 #define INTEGER_BITS		7
 
 /*
@@ -68,12 +70,15 @@  static unsigned long __mtk_pll_recalc_rate(struct mtk_clk_pll *pll, u32 fin,
 		u32 pcw, int postdiv)
 {
 	int pcwbits = pll->data->pcwbits;
-	int pcwfbits;
+	int pcwfbits = 0;
+	int ibits;
 	u64 vco;
 	u8 c = 0;
 
 	/* The fractional part of the PLL divider. */
-	pcwfbits = pcwbits > INTEGER_BITS ? pcwbits - INTEGER_BITS : 0;
+	ibits = pll->data->pcwibits ? pll->data->pcwibits : INTEGER_BITS;
+	if (pcwbits > ibits)
+		pcwfbits = pcwbits - ibits;
 
 	vco = (u64)fin * pcw;
 
@@ -170,9 +175,10 @@  static void mtk_pll_set_rate_regs(struct mtk_clk_pll *pll, u32 pcw,
 static void mtk_pll_calc_values(struct mtk_clk_pll *pll, u32 *pcw, u32 *postdiv,
 		u32 freq, u32 fin)
 {
-	unsigned long fmin = 1000 * MHZ;
+	unsigned long fmin = pll->data->fmin ? pll->data->fmin : (1000 * MHZ);
 	const struct mtk_pll_div_table *div_table = pll->data->div_table;
 	u64 _pcw;
+	int ibits;
 	u32 val;
 
 	if (freq > pll->data->fmax)
@@ -196,7 +202,8 @@  static void mtk_pll_calc_values(struct mtk_clk_pll *pll, u32 *pcw, u32 *postdiv,
 	}
 
 	/* _pcw = freq * postdiv / fin * 2^pcwfbits */
-	_pcw = ((u64)freq << val) << (pll->data->pcwbits - INTEGER_BITS);
+	ibits = pll->data->pcwibits ? pll->data->pcwibits : INTEGER_BITS;
+	_pcw = ((u64)freq << val) << (pll->data->pcwbits - ibits);
 	do_div(_pcw, fin);
 
 	*pcw = (u32)_pcw;