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clk: g12a/g12b: fix 32bit set mpll clk overflow [1/1]

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PD#SWPL-1933

Problem:
32bit system clk overflow

Solution:
let mpll clock not overflow

Verify:
g12b

Change-Id: Ie1c7c611e637776348bb35a3e0c1624cee57716f
Signed-off-by: shunzhou.jiang <shunzhou.jiang@amlogic.com>
This commit is contained in:
Shunzhou Jiang
2018-11-16 15:54:52 +08:00
committed by Dongjin Kim
parent 6bd599c616
commit fcb2ff9805
1 changed files with 8 additions and 3 deletions
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11
drivers/amlogic/clk/g12a/g12a_clk-mpll.c
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@@ -28,7 +28,7 @@
#include "../clkc.h"
/* #undef pr_debug */
/* #define pr_debug pr_info */
#define SDM_MAX 16384
#define SDM_MAX 16384ULL
#define MAX_RATE 500000000
#define MIN_RATE 3920000
@@ -87,6 +87,7 @@ static int mpll_set_rate(struct clk_hw *hw, unsigned long rate,
struct parm *p;
unsigned long reg, sdm, n2;
unsigned long flags = 0;
uint64_t rate64 = parent_rate;
if ((rate > MAX_RATE) || (rate < MIN_RATE)) {
pr_err("Err: can not set rate to %lu!\n", rate);
@@ -98,8 +99,12 @@ static int mpll_set_rate(struct clk_hw *hw, unsigned long rate,
spin_lock_irqsave(mpll->lock, flags);
/* calculate new n2 and sdm */
n2 = parent_rate / rate;
sdm = DIV_ROUND_UP((parent_rate - n2 * rate) * SDM_MAX, rate);
do_div(rate64, rate);
n2 = rate64;
rate64 = (parent_rate - n2 * rate) * SDM_MAX + rate - 1;
do_div(rate64, rate);
sdm = rate64;
if (sdm >= SDM_MAX)
sdm = SDM_MAX - 1;