diff options
Diffstat (limited to 'drivers/clk/shmobile/clk-div6.c')
| -rw-r--r-- | drivers/clk/shmobile/clk-div6.c | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/drivers/clk/shmobile/clk-div6.c b/drivers/clk/shmobile/clk-div6.c index 639241e31e03..036a692c7219 100644 --- a/drivers/clk/shmobile/clk-div6.c +++ b/drivers/clk/shmobile/clk-div6.c @@ -54,12 +54,19 @@ static int cpg_div6_clock_enable(struct clk_hw *hw) static void cpg_div6_clock_disable(struct clk_hw *hw) { struct div6_clock *clock = to_div6_clock(hw); + u32 val; - /* DIV6 clocks require the divisor field to be non-zero when stopping - * the clock. + val = clk_readl(clock->reg); + val |= CPG_DIV6_CKSTP; + /* + * DIV6 clocks require the divisor field to be non-zero when stopping + * the clock. However, some clocks (e.g. ZB on sh73a0) fail to be + * re-enabled later if the divisor field is changed when stopping the + * clock */ - clk_writel(clk_readl(clock->reg) | CPG_DIV6_CKSTP | CPG_DIV6_DIV_MASK, - clock->reg); + if (!(val & CPG_DIV6_DIV_MASK)) + val |= CPG_DIV6_DIV_MASK; + clk_writel(val, clock->reg); } static int cpg_div6_clock_is_enabled(struct clk_hw *hw) @@ -83,6 +90,9 @@ static unsigned int cpg_div6_clock_calc_div(unsigned long rate, { unsigned int div; + if (!rate) + rate = 1; + div = DIV_ROUND_CLOSEST(parent_rate, rate); return clamp_t(unsigned int, div, 1, 64); } |