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Date: Fri, 21 Oct 2016 23:57:11 +0100
From: André Przywara <andre.przywara@....com>
To: Maxime Ripard <maxime.ripard@...e-electrons.com>,
Mike Turquette <mturquette@...libre.com>,
Stephen Boyd <sboyd@...eaurora.org>,
Chen-Yu Tsai <wens@...e.org>
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
linux-clk@...r.kernel.org, linux-sunxi@...glegroups.com
Subject: Re: [PATCH v4 4/9] clk: sunxi-ng: Add minimums for all the relevant
structures and clocks
Salut,
On 11/10/16 15:28, Maxime Ripard wrote:
> 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@...e-electrons.com>
> ---
> 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 | 16 ++++++++++++----
> drivers/clk/sunxi-ng/ccu_nm.c | 12 ++++++++----
> 5 files changed, 46 insertions(+), 19 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..b2a5fccf2f8c 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; _n <= nkm->max_m; _m++) {
should be _m in the condition
> 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 4b457d8cce11..2c1398192e48 100644
> --- a/drivers/clk/sunxi-ng/ccu_nkmp.c
> +++ b/drivers/clk/sunxi-ng/ccu_nkmp.c
> @@ -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 <= nkm->max_n; _n++) {
> - for (_m = 1; _n <= nkm->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; _n <= nkmp->max_m; _m++) {
Same here: _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..2a190bc032a9 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; _n <= nm->max_m; _m++) {
And here: _m <= ...
Interestingly those typos were already in the code before.
Lets hope I don't dream of m's and k's tonight.
Cheers,
Andre.
> 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);
>
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