diff mbox series

[v5,07/11] clk: sunxi-ng: nkm: Support finding closest rate

Message ID 20230806-pll-mipi_set_rate_parent-v5-7-db4f5ca33fc3@oltmanns.dev (mailing list archive)
State Superseded, archived
Headers show
Series clk: sunxi-ng: Consider alternative parent rates when determining NKM clock rate | expand

Commit Message

Frank Oltmanns Aug. 6, 2023, 1:06 p.m. UTC 
When finding the best rate for a NKM clock, consider rates that are
higher than the requested rate, if the CCU_FEATURE_CLOSEST_RATE flag is
set by using the helper function ccu_is_better_rate().

Accommodate ccu_mux_helper_determine_rate to this change.

Acked-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Frank Oltmanns <frank@oltmanns.dev>
---
 drivers/clk/sunxi-ng/ccu_mux.c |  2 +-
 drivers/clk/sunxi-ng/ccu_nkm.c | 20 +++++++++-----------
 2 files changed, 10 insertions(+), 12 deletions(-)

Comments

Jernej Škrabec Aug. 6, 2023, 1:42 p.m. UTC | #1 
Dne nedelja, 06. avgust 2023 ob 15:06:52 CEST je Frank Oltmanns napisal(a):
> When finding the best rate for a NKM clock, consider rates that are
> higher than the requested rate, if the CCU_FEATURE_CLOSEST_RATE flag is
> set by using the helper function ccu_is_better_rate().
> 
> Accommodate ccu_mux_helper_determine_rate to this change.
> 
> Acked-by: Maxime Ripard <mripard@kernel.org>
> Signed-off-by: Frank Oltmanns <frank@oltmanns.dev>

Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>

Best regards,
Jernej

> ---
>  drivers/clk/sunxi-ng/ccu_mux.c |  2 +-
>  drivers/clk/sunxi-ng/ccu_nkm.c | 20 +++++++++-----------
>  2 files changed, 10 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/clk/sunxi-ng/ccu_mux.c b/drivers/clk/sunxi-ng/ccu_mux.c
> index 1d557e323169..3ca695439620 100644
> --- a/drivers/clk/sunxi-ng/ccu_mux.c
> +++ b/drivers/clk/sunxi-ng/ccu_mux.c
> @@ -139,7 +139,7 @@ int ccu_mux_helper_determine_rate(struct ccu_common
> *common, goto out;
>  		}
> 
> -		if ((req->rate - tmp_rate) < (req->rate - best_rate)) {
> +		if (ccu_is_better_rate(common, req->rate, tmp_rate, 
best_rate)) {
>  			best_rate = tmp_rate;
>  			best_parent_rate = parent_rate;
>  			best_parent = parent;
> diff --git a/drivers/clk/sunxi-ng/ccu_nkm.c b/drivers/clk/sunxi-ng/ccu_nkm.c
> index ea1b77e9b57f..896bb1ef8642 100644
> --- a/drivers/clk/sunxi-ng/ccu_nkm.c
> +++ b/drivers/clk/sunxi-ng/ccu_nkm.c
> @@ -17,7 +17,8 @@ struct _ccu_nkm {
>  	unsigned long	m, min_m, max_m;
>  };
> 
> -static unsigned long ccu_nkm_find_best_with_parent_adj(struct clk_hw
> *parent_hw, +static unsigned long ccu_nkm_find_best_with_parent_adj(struct
> ccu_common *common, +						
       struct clk_hw *parent_hw,
>  						       
unsigned long *parent, unsigned long rate,
>  						       
struct _ccu_nkm *nkm)
>  {
> @@ -33,10 +34,8 @@ static unsigned long
> ccu_nkm_find_best_with_parent_adj(struct clk_hw *parent_hw, tmp_parent =
> clk_hw_round_rate(parent_hw, rate * _m / (_n * _k));
> 
>  				tmp_rate = tmp_parent * _n * _k / 
_m;
> -				if (tmp_rate > rate)
> -					continue;
> 
> -				if ((rate - tmp_rate) < (rate - 
best_rate)) {
> +				if (ccu_is_better_rate(common, 
rate, tmp_rate, best_rate)) {
>  					best_rate = tmp_rate;
>  					best_parent_rate = 
tmp_parent;
>  					best_n = _n;
> @@ -57,7 +56,7 @@ static unsigned long
> ccu_nkm_find_best_with_parent_adj(struct clk_hw *parent_hw, }
> 
>  static unsigned long ccu_nkm_find_best(unsigned long parent, unsigned long
> rate, -				       struct _ccu_nkm *nkm)
> +				       struct _ccu_nkm *nkm, 
struct ccu_common *common)
>  {
>  	unsigned long best_rate = 0;
>  	unsigned long best_n = 0, best_k = 0, best_m = 0;
> @@ -70,9 +69,7 @@ static unsigned long ccu_nkm_find_best(unsigned long
> parent, unsigned long rate,
> 
>  				tmp_rate = parent * _n * _k / _m;
> 
> -				if (tmp_rate > rate)
> -					continue;
> -				if ((rate - tmp_rate) < (rate - 
best_rate)) {
> +				if (ccu_is_better_rate(common, 
rate, tmp_rate, best_rate)) {
>  					best_rate = tmp_rate;
>  					best_n = _n;
>  					best_k = _k;
> @@ -165,9 +162,10 @@ static unsigned long ccu_nkm_round_rate(struct
> ccu_mux_internal *mux, rate *= nkm->fixed_post_div;
> 
>  	if (!clk_hw_can_set_rate_parent(&nkm->common.hw))
> -		rate = ccu_nkm_find_best(*parent_rate, rate, &_nkm);
> +		rate = ccu_nkm_find_best(*parent_rate, rate, &_nkm, &nkm-
>common);
>  	else
> -		rate = ccu_nkm_find_best_with_parent_adj(parent_hw, 
parent_rate, rate,
> &_nkm); +		rate = ccu_nkm_find_best_with_parent_adj(&nkm->common,
> parent_hw, parent_rate, rate, +					
		 &_nkm);
> 
>  	if (nkm->common.features & CCU_FEATURE_FIXED_POSTDIV)
>  		rate /= nkm->fixed_post_div;
> @@ -202,7 +200,7 @@ static int ccu_nkm_set_rate(struct clk_hw *hw, unsigned
> long rate, _nkm.min_m = 1;
>  	_nkm.max_m = nkm->m.max ?: 1 << nkm->m.width;
> 
> -	ccu_nkm_find_best(parent_rate, rate, &_nkm);
> +	ccu_nkm_find_best(parent_rate, rate, &_nkm, &nkm->common);
> 
>  	spin_lock_irqsave(nkm->common.lock, flags);
diff mbox series

Patch

diff --git a/drivers/clk/sunxi-ng/ccu_mux.c b/drivers/clk/sunxi-ng/ccu_mux.c
index 1d557e323169..3ca695439620 100644
--- a/drivers/clk/sunxi-ng/ccu_mux.c
+++ b/drivers/clk/sunxi-ng/ccu_mux.c
@@ -139,7 +139,7 @@  int ccu_mux_helper_determine_rate(struct ccu_common *common,
 			goto out;
 		}
 
-		if ((req->rate - tmp_rate) < (req->rate - best_rate)) {
+		if (ccu_is_better_rate(common, req->rate, tmp_rate, best_rate)) {
 			best_rate = tmp_rate;
 			best_parent_rate = parent_rate;
 			best_parent = parent;
diff --git a/drivers/clk/sunxi-ng/ccu_nkm.c b/drivers/clk/sunxi-ng/ccu_nkm.c
index ea1b77e9b57f..896bb1ef8642 100644
--- a/drivers/clk/sunxi-ng/ccu_nkm.c
+++ b/drivers/clk/sunxi-ng/ccu_nkm.c
@@ -17,7 +17,8 @@  struct _ccu_nkm {
 	unsigned long	m, min_m, max_m;
 };
 
-static unsigned long ccu_nkm_find_best_with_parent_adj(struct clk_hw *parent_hw,
+static unsigned long ccu_nkm_find_best_with_parent_adj(struct ccu_common *common,
+						       struct clk_hw *parent_hw,
 						       unsigned long *parent, unsigned long rate,
 						       struct _ccu_nkm *nkm)
 {
@@ -33,10 +34,8 @@  static unsigned long ccu_nkm_find_best_with_parent_adj(struct clk_hw *parent_hw,
 				tmp_parent = clk_hw_round_rate(parent_hw, rate * _m / (_n * _k));
 
 				tmp_rate = tmp_parent * _n * _k / _m;
-				if (tmp_rate > rate)
-					continue;
 
-				if ((rate - tmp_rate) < (rate - best_rate)) {
+				if (ccu_is_better_rate(common, rate, tmp_rate, best_rate)) {
 					best_rate = tmp_rate;
 					best_parent_rate = tmp_parent;
 					best_n = _n;
@@ -57,7 +56,7 @@  static unsigned long ccu_nkm_find_best_with_parent_adj(struct clk_hw *parent_hw,
 }
 
 static unsigned long ccu_nkm_find_best(unsigned long parent, unsigned long rate,
-				       struct _ccu_nkm *nkm)
+				       struct _ccu_nkm *nkm, struct ccu_common *common)
 {
 	unsigned long best_rate = 0;
 	unsigned long best_n = 0, best_k = 0, best_m = 0;
@@ -70,9 +69,7 @@  static unsigned long ccu_nkm_find_best(unsigned long parent, unsigned long rate,
 
 				tmp_rate = parent * _n * _k / _m;
 
-				if (tmp_rate > rate)
-					continue;
-				if ((rate - tmp_rate) < (rate - best_rate)) {
+				if (ccu_is_better_rate(common, rate, tmp_rate, best_rate)) {
 					best_rate = tmp_rate;
 					best_n = _n;
 					best_k = _k;
@@ -165,9 +162,10 @@  static unsigned long ccu_nkm_round_rate(struct ccu_mux_internal *mux,
 		rate *= nkm->fixed_post_div;
 
 	if (!clk_hw_can_set_rate_parent(&nkm->common.hw))
-		rate = ccu_nkm_find_best(*parent_rate, rate, &_nkm);
+		rate = ccu_nkm_find_best(*parent_rate, rate, &_nkm, &nkm->common);
 	else
-		rate = ccu_nkm_find_best_with_parent_adj(parent_hw, parent_rate, rate, &_nkm);
+		rate = ccu_nkm_find_best_with_parent_adj(&nkm->common, parent_hw, parent_rate, rate,
+							 &_nkm);
 
 	if (nkm->common.features & CCU_FEATURE_FIXED_POSTDIV)
 		rate /= nkm->fixed_post_div;
@@ -202,7 +200,7 @@  static int ccu_nkm_set_rate(struct clk_hw *hw, unsigned long rate,
 	_nkm.min_m = 1;
 	_nkm.max_m = nkm->m.max ?: 1 << nkm->m.width;
 
-	ccu_nkm_find_best(parent_rate, rate, &_nkm);
+	ccu_nkm_find_best(parent_rate, rate, &_nkm, &nkm->common);
 
 	spin_lock_irqsave(nkm->common.lock, flags);