diff options
Diffstat (limited to 'drivers/clk/imx/clk-composite-8m.c')
| -rw-r--r-- | drivers/clk/imx/clk-composite-8m.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/drivers/clk/imx/clk-composite-8m.c b/drivers/clk/imx/clk-composite-8m.c index d3486ee79ab5..78122188ac39 100644 --- a/drivers/clk/imx/clk-composite-8m.c +++ b/drivers/clk/imx/clk-composite-8m.c @@ -95,7 +95,7 @@ static int imx8m_clk_composite_divider_set_rate(struct clk_hw *hw, int prediv_value; int div_value; int ret; - u32 val; + u32 orig, val; ret = imx8m_clk_composite_compute_dividers(rate, parent_rate, &prediv_value, &div_value); @@ -104,13 +104,15 @@ static int imx8m_clk_composite_divider_set_rate(struct clk_hw *hw, spin_lock_irqsave(divider->lock, flags); - val = readl(divider->reg); - val &= ~((clk_div_mask(divider->width) << divider->shift) | - (clk_div_mask(PCG_DIV_WIDTH) << PCG_DIV_SHIFT)); + orig = readl(divider->reg); + val = orig & ~((clk_div_mask(divider->width) << divider->shift) | + (clk_div_mask(PCG_DIV_WIDTH) << PCG_DIV_SHIFT)); val |= (u32)(prediv_value - 1) << divider->shift; val |= (u32)(div_value - 1) << PCG_DIV_SHIFT; - writel(val, divider->reg); + + if (val != orig) + writel(val, divider->reg); spin_unlock_irqrestore(divider->lock, flags); |