clk: sunxi-ng: Add minimums for all the relevant structures and clocks

Modify the current clocks we have to be able to specify the minimum for
each clocks we support, just like we support the max.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Chen-Yu Tsai <wens@csie.org>

5 files changed, 50 insertions, 23 deletions

diff --git a/drivers/clk/sunxi-ng/ccu_mult.c b/drivers/clk/sunxi-ng/ccu_mult.c
index 32a1964439a2..6a02ffee5386 100644
--- a/drivers/clk/sunxi-ng/ccu_mult.c
+++ b/drivers/clk/sunxi-ng/ccu_mult.c
@@ -14,7 +14,7 @@
 #include "ccu_mult.h"
 
 struct _ccu_mult {
-	unsigned long	mult, max;
+	unsigned long	mult, min, max;
 };
 
 static void ccu_mult_find_best(unsigned long parent, unsigned long rate,
@@ -23,6 +23,9 @@ static void ccu_mult_find_best(unsigned long parent, unsigned long rate,
 	int _mult;
 
 	_mult = rate / parent;
+	if (_mult < mult->min)
+		_mult = mult->min;
+
 	if (_mult > mult->max)
 		_mult = mult->max;
 
@@ -37,6 +40,7 @@ static unsigned long ccu_mult_round_rate(struct ccu_mux_internal *mux,
 	struct ccu_mult *cm = data;
 	struct _ccu_mult _cm;
 
+	_cm.min = 1;
 	_cm.max = 1 << cm->mult.width;
 	ccu_mult_find_best(parent_rate, rate, &_cm);
 
@@ -101,6 +105,7 @@ static int ccu_mult_set_rate(struct clk_hw *hw, unsigned long rate,
 	ccu_mux_helper_adjust_parent_for_prediv(&cm->common, &cm->mux, -1,
 						&parent_rate);
 
+	_cm.min = 1;
 	_cm.max = 1 << cm->mult.width;
 	ccu_mult_find_best(parent_rate, rate, &_cm);
 
diff --git a/drivers/clk/sunxi-ng/ccu_nk.c b/drivers/clk/sunxi-ng/ccu_nk.c
index e7e2e75618ef..a42d870ba0ef 100644
--- a/drivers/clk/sunxi-ng/ccu_nk.c
+++ b/drivers/clk/sunxi-ng/ccu_nk.c
@@ -14,8 +14,8 @@
 #include "ccu_nk.h"
 
 struct _ccu_nk {
-	unsigned long	n, max_n;
-	unsigned long	k, max_k;
+	unsigned long	n, min_n, max_n;
+	unsigned long	k, min_k, max_k;
 };
 
 static void ccu_nk_find_best(unsigned long parent, unsigned long rate,
@@ -25,8 +25,8 @@ static void ccu_nk_find_best(unsigned long parent, unsigned long rate,
 	unsigned int best_k = 0, best_n = 0;
 	unsigned int _k, _n;
 
-	for (_k = 1; _k <= nk->max_k; _k++) {
-		for (_n = 1; _n <= nk->max_n; _n++) {
+	for (_k = nk->min_k; _k <= nk->max_k; _k++) {
+		for (_n = nk->min_n; _n <= nk->max_n; _n++) {
 			unsigned long tmp_rate = parent * _n * _k;
 
 			if (tmp_rate > rate)
@@ -97,7 +97,9 @@ static long ccu_nk_round_rate(struct clk_hw *hw, unsigned long rate,
 	if (nk->common.features & CCU_FEATURE_FIXED_POSTDIV)
 		rate *= nk->fixed_post_div;
 
+	_nk.min_n = 1;
 	_nk.max_n = 1 << nk->n.width;
+	_nk.min_k = 1;
 	_nk.max_k = 1 << nk->k.width;
 
 	ccu_nk_find_best(*parent_rate, rate, &_nk);
@@ -120,7 +122,9 @@ static int ccu_nk_set_rate(struct clk_hw *hw, unsigned long rate,
 	if (nk->common.features & CCU_FEATURE_FIXED_POSTDIV)
 		rate = rate * nk->fixed_post_div;
 
+	_nk.min_n = 1;
 	_nk.max_n = 1 << nk->n.width;
+	_nk.min_k = 1;
 	_nk.max_k = 1 << nk->k.width;
 
 	ccu_nk_find_best(parent_rate, rate, &_nk);
diff --git a/drivers/clk/sunxi-ng/ccu_nkm.c b/drivers/clk/sunxi-ng/ccu_nkm.c
index 0b08d000eb38..42177320930d 100644
--- a/drivers/clk/sunxi-ng/ccu_nkm.c
+++ b/drivers/clk/sunxi-ng/ccu_nkm.c
@@ -14,9 +14,9 @@
 #include "ccu_nkm.h"
 
 struct _ccu_nkm {
-	unsigned long	n, max_n;
-	unsigned long	k, max_k;
-	unsigned long	m, max_m;
+	unsigned long	n, min_n, max_n;
+	unsigned long	k, min_k, max_k;
+	unsigned long	m, min_m, max_m;
 };
 
 static void ccu_nkm_find_best(unsigned long parent, unsigned long rate,
@@ -26,9 +26,9 @@ static void ccu_nkm_find_best(unsigned long parent, unsigned long rate,
 	unsigned long best_n = 0, best_k = 0, best_m = 0;
 	unsigned long _n, _k, _m;
 
-	for (_k = 1; _k <= nkm->max_k; _k++) {
-		for (_n = 1; _n <= nkm->max_n; _n++) {
-			for (_m = 1; _n <= nkm->max_m; _m++) {
+	for (_k = nkm->min_k; _k <= nkm->max_k; _k++) {
+		for (_n = nkm->min_n; _n <= nkm->max_n; _n++) {
+			for (_m = nkm->min_m; _m <= nkm->max_m; _m++) {
 				unsigned long tmp_rate;
 
 				tmp_rate = parent * _n * _k / _m;
@@ -100,8 +100,11 @@ static unsigned long ccu_nkm_round_rate(struct ccu_mux_internal *mux,
 	struct ccu_nkm *nkm = data;
 	struct _ccu_nkm _nkm;
 
+	_nkm.min_n = 1;
 	_nkm.max_n = 1 << nkm->n.width;
+	_nkm.min_k = 1;
 	_nkm.max_k = 1 << nkm->k.width;
+	_nkm.min_m = 1;
 	_nkm.max_m = nkm->m.max ?: 1 << nkm->m.width;
 
 	ccu_nkm_find_best(parent_rate, rate, &_nkm);
@@ -126,8 +129,11 @@ static int ccu_nkm_set_rate(struct clk_hw *hw, unsigned long rate,
 	unsigned long flags;
 	u32 reg;
 
+	_nkm.min_n = 1;
 	_nkm.max_n = 1 << nkm->n.width;
+	_nkm.min_k = 1;
 	_nkm.max_k = 1 << nkm->k.width;
+	_nkm.min_m = 1;
 	_nkm.max_m = nkm->m.max ?: 1 << nkm->m.width;
 
 	ccu_nkm_find_best(parent_rate, rate, &_nkm);
diff --git a/drivers/clk/sunxi-ng/ccu_nkmp.c b/drivers/clk/sunxi-ng/ccu_nkmp.c
index fcf67572e55c..67c856e381a8 100644
--- a/drivers/clk/sunxi-ng/ccu_nkmp.c
+++ b/drivers/clk/sunxi-ng/ccu_nkmp.c
@@ -14,10 +14,10 @@
 #include "ccu_nkmp.h"
 
 struct _ccu_nkmp {
-	unsigned long	n, max_n;
-	unsigned long	k, max_k;
-	unsigned long	m, max_m;
-	unsigned long	p, max_p;
+	unsigned long	n, min_n, max_n;
+	unsigned long	k, min_k, max_k;
+	unsigned long	m, min_m, max_m;
+	unsigned long	p, min_p, max_p;
 };
 
 static void ccu_nkmp_find_best(unsigned long parent, unsigned long rate,
@@ -27,10 +27,10 @@ static void ccu_nkmp_find_best(unsigned long parent, unsigned long rate,
 	unsigned long best_n = 0, best_k = 0, best_m = 0, best_p = 0;
 	unsigned long _n, _k, _m, _p;
 
-	for (_k = 1; _k <= nkmp->max_k; _k++) {
-		for (_n = 1; _n <= nkmp->max_n; _n++) {
-			for (_m = 1; _n <= nkmp->max_m; _m++) {
-				for (_p = 1; _p <= nkmp->max_p; _p <<= 1) {
+	for (_k = nkmp->min_k; _k <= nkmp->max_k; _k++) {
+		for (_n = nkmp->min_n; _n <= nkmp->max_n; _n++) {
+			for (_m = nkmp->min_m; _m <= nkmp->max_m; _m++) {
+				for (_p = nkmp->min_p; _p <= nkmp->max_p; _p <<= 1) {
 					unsigned long tmp_rate;
 
 					tmp_rate = parent * _n * _k / (_m * _p);
@@ -107,9 +107,13 @@ static long ccu_nkmp_round_rate(struct clk_hw *hw, unsigned long rate,
 	struct ccu_nkmp *nkmp = hw_to_ccu_nkmp(hw);
 	struct _ccu_nkmp _nkmp;
 
+	_nkmp.min_n = 1;
 	_nkmp.max_n = 1 << nkmp->n.width;
+	_nkmp.min_k = 1;
 	_nkmp.max_k = 1 << nkmp->k.width;
+	_nkmp.min_m = 1;
 	_nkmp.max_m = nkmp->m.max ?: 1 << nkmp->m.width;
+	_nkmp.min_p = 1;
 	_nkmp.max_p = nkmp->p.max ?: 1 << ((1 << nkmp->p.width) - 1);
 
 	ccu_nkmp_find_best(*parent_rate, rate, &_nkmp);
@@ -125,9 +129,13 @@ static int ccu_nkmp_set_rate(struct clk_hw *hw, unsigned long rate,
 	unsigned long flags;
 	u32 reg;
 
+	_nkmp.min_n = 1;
 	_nkmp.max_n = 1 << nkmp->n.width;
+	_nkmp.min_k = 1;
 	_nkmp.max_k = 1 << nkmp->k.width;
+	_nkmp.min_m = 1;
 	_nkmp.max_m = nkmp->m.max ?: 1 << nkmp->m.width;
+	_nkmp.min_p = 1;
 	_nkmp.max_p = nkmp->p.max ?: 1 << ((1 << nkmp->p.width) - 1);
 
 	ccu_nkmp_find_best(parent_rate, rate, &_nkmp);
diff --git a/drivers/clk/sunxi-ng/ccu_nm.c b/drivers/clk/sunxi-ng/ccu_nm.c
index c6d652289320..1dae4f3ed00d 100644
--- a/drivers/clk/sunxi-ng/ccu_nm.c
+++ b/drivers/clk/sunxi-ng/ccu_nm.c
@@ -15,8 +15,8 @@
 #include "ccu_nm.h"
 
 struct _ccu_nm {
-	unsigned long	n, max_n;
-	unsigned long	m, max_m;
+	unsigned long	n, min_n, max_n;
+	unsigned long	m, min_m, max_m;
 };
 
 static void ccu_nm_find_best(unsigned long parent, unsigned long rate,
@@ -26,8 +26,8 @@ static void ccu_nm_find_best(unsigned long parent, unsigned long rate,
 	unsigned long best_n = 0, best_m = 0;
 	unsigned long _n, _m;
 
-	for (_n = 1; _n <= nm->max_n; _n++) {
-		for (_m = 1; _n <= nm->max_m; _m++) {
+	for (_n = nm->min_n; _n <= nm->max_n; _n++) {
+		for (_m = nm->min_m; _m <= nm->max_m; _m++) {
 			unsigned long tmp_rate = parent * _n  / _m;
 
 			if (tmp_rate > rate)
@@ -93,7 +93,9 @@ static long ccu_nm_round_rate(struct clk_hw *hw, unsigned long rate,
 	struct ccu_nm *nm = hw_to_ccu_nm(hw);
 	struct _ccu_nm _nm;
 
+	_nm.min_n = 1;
 	_nm.max_n = 1 << nm->n.width;
+	_nm.min_m = 1;
 	_nm.max_m = nm->m.max ?: 1 << nm->m.width;
 
 	ccu_nm_find_best(*parent_rate, rate, &_nm);
@@ -114,7 +116,9 @@ static int ccu_nm_set_rate(struct clk_hw *hw, unsigned long rate,
 	else
 		ccu_frac_helper_disable(&nm->common, &nm->frac);
 
+	_nm.min_n = 1;
 	_nm.max_n = 1 << nm->n.width;
+	_nm.min_m = 1;
 	_nm.max_m = nm->m.max ?: 1 << nm->m.width;
 
 	ccu_nm_find_best(parent_rate, rate, &_nm);