diff options
| -rw-r--r-- | arch/arm/mach-shmobile/clock-r8a73a4.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/arch/arm/mach-shmobile/clock-r8a73a4.c b/arch/arm/mach-shmobile/clock-r8a73a4.c index 824789c26fb6..22f10ff40272 100644 --- a/arch/arm/mach-shmobile/clock-r8a73a4.c +++ b/arch/arm/mach-shmobile/clock-r8a73a4.c @@ -225,16 +225,28 @@ static int zclk_set_rate(struct clk *clk, unsigned long rate) goto done; } - frqcrc = clk->mapped_reg + (FRQCRC - (u32)clk->enable_reg); + /* + * Users are supposed to first call clk_set_rate() only with + * clk_round_rate() results. So, we don't fix wrong rates here, but + * guard against them anyway + */ p_rate = clk_get_rate(clk->parent); if (rate == p_rate) { val = 0; } else { step = DIV_ROUND_CLOSEST(p_rate, 32); + + if (rate > p_rate || rate < step) { + ret = -EINVAL; + goto done; + } + val = 32 - rate / step; } + frqcrc = clk->mapped_reg + (FRQCRC - (u32)clk->enable_reg); + iowrite32((ioread32(frqcrc) & ~(clk->div_mask << clk->enable_bit)) | (val << clk->enable_bit), frqcrc); |