The patch below does not apply to the 4.14-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 65b6657672388b72822e0367f06d41c1e3ffb5bb Mon Sep 17 00:00:00 2001

From: Jernej Skrabec jernej.skrabec@siol.net Date: Sun, 4 Nov 2018 19:26:40 +0100 Subject: [PATCH] clk: sunxi-ng: Use u64 for calculation of NM rate

Allwinner H6 SoC has multiplier N range between 1 and 254. Since parent rate is 24MHz, intermediate result when calculating final rate easily overflows 32 bit variable.

Because of that, introduce function for calculating clock rate which uses 64 bit variable for intermediate result.

Fixes: 6174a1e24b0d ("clk: sunxi-ng: Add N-M-factor clock support") Fixes: ee28648cb2b4 ("clk: sunxi-ng: Remove the use of rational computations")

CC: stable@vger.kernel.org Signed-off-by: Jernej Skrabec jernej.skrabec@siol.net Signed-off-by: Maxime Ripard maxime.ripard@bootlin.com

diff --git a/drivers/clk/sunxi-ng/ccu_nm.c b/drivers/clk/sunxi-ng/ccu_nm.c index 6fe3c14f7b2d..424d8635b053 100644 --- a/drivers/clk/sunxi-ng/ccu_nm.c +++ b/drivers/clk/sunxi-ng/ccu_nm.c @@ -19,6 +19,17 @@ struct _ccu_nm { unsigned long m, min_m, max_m; };

+static unsigned long ccu_nm_calc_rate(unsigned long parent, + unsigned long n, unsigned long m) +{ + u64 rate = parent; + + rate *= n; + do_div(rate, m); + + return rate; +} + static void ccu_nm_find_best(unsigned long parent, unsigned long rate, struct _ccu_nm *nm) { @@ -28,7 +39,8 @@ static void ccu_nm_find_best(unsigned long parent, unsigned long rate,

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; + unsigned long tmp_rate = ccu_nm_calc_rate(parent, + _n, _m);

if (tmp_rate > rate) continue; @@ -100,7 +112,7 @@ static unsigned long ccu_nm_recalc_rate(struct clk_hw *hw, if (ccu_sdm_helper_is_enabled(&nm->common, &nm->sdm)) rate = ccu_sdm_helper_read_rate(&nm->common, &nm->sdm, m, n); else - rate = parent_rate * n / m; + rate = ccu_nm_calc_rate(parent_rate, n, m);

if (nm->common.features & CCU_FEATURE_FIXED_POSTDIV) rate /= nm->fixed_post_div; @@ -149,7 +161,7 @@ static long ccu_nm_round_rate(struct clk_hw *hw, unsigned long rate, _nm.max_m = nm->m.max ?: 1 << nm->m.width;

ccu_nm_find_best(*parent_rate, rate, &_nm); - rate = *parent_rate * _nm.n / _nm.m; + rate = ccu_nm_calc_rate(*parent_rate, _nm.n, _nm.m);

if (nm->common.features & CCU_FEATURE_FIXED_POSTDIV) rate /= nm->fixed_post_div;