openwrt/target/linux/sunxi/patches-4.9/0005-clk-sunxi-ng-Add-minimums-for-all-the-relevant-struc.patch

From 6e0d50daa97f4bf9706e343b4f71171e88921209 Mon Sep 17 00:00:00 2001
From: Maxime Ripard <maxime.ripard@free-electrons.com>
Date: Thu, 29 Sep 2016 22:57:26 +0200
Subject: 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>
---
 drivers/clk/sunxi-ng/ccu_mult.c |  7 ++++++-
 drivers/clk/sunxi-ng/ccu_nk.c   | 12 ++++++++----
 drivers/clk/sunxi-ng/ccu_nkm.c  | 18 ++++++++++++------
 drivers/clk/sunxi-ng/ccu_nkmp.c | 24 ++++++++++++++++--------
 drivers/clk/sunxi-ng/ccu_nm.c   | 12 ++++++++----
 5 files changed, 50 insertions(+), 23 deletions(-)

--- 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
 	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_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_
 	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);
 
--- 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 lo
 	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
 	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
 	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);
--- 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 l
 	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_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_h
 	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);
--- 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
 	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 c
 	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_
 	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);
--- 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 lo
 	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
 	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
 	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);