[PATCH v8 1/6] clk: Ingenic: Remove unnecessary spinlock when reading registers.

[Zhou Yanjie]

It is not necessary to use spinlock when reading registers,
so remove it from cgu.c.

Suggested-by: Paul Cercueil <p...@crapouillou.net>
Suggested-by: Paul Burton <paulbur...@kernel.org>
Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyan...@wanyeetech.com>
Reviewed-by: Paul Cercueil <p...@crapouillou.net>
---

Notes:
    v2:
    New patch.
    
    v2->v3:
    Adjust order from [5/5] in v2 to [1/5] in v3.
    
    v3->v4:
    Remove the spinlock around ingenic_cgu_gate_get().
    
    v4->v5:
    Rebase on top of kernel 5.6-rc1.
    
    v5->v6:
    No change.
    
    v6->v7:
    No change.
    
    v7->v8:
    No change.

 drivers/clk/ingenic/cgu.c | 12 +-----------
 1 file changed, 1 insertion(+), 11 deletions(-)

diff --git a/drivers/clk/ingenic/cgu.c b/drivers/clk/ingenic/cgu.c
index 6e96303..ab1302a 100644
--- a/drivers/clk/ingenic/cgu.c
+++ b/drivers/clk/ingenic/cgu.c
@@ -76,16 +76,13 @@ ingenic_pll_recalc_rate(struct clk_hw *hw, unsigned long 
parent_rate)
        const struct ingenic_cgu_pll_info *pll_info;
        unsigned m, n, od_enc, od;
        bool bypass;
-       unsigned long flags;
        u32 ctl;
 
        clk_info = &cgu->clock_info[ingenic_clk->idx];
        BUG_ON(clk_info->type != CGU_CLK_PLL);
        pll_info = &clk_info->pll;
 
-       spin_lock_irqsave(&cgu->lock, flags);
        ctl = readl(cgu->base + pll_info->reg);
-       spin_unlock_irqrestore(&cgu->lock, flags);
 
        m = (ctl >> pll_info->m_shift) & GENMASK(pll_info->m_bits - 1, 0);
        m += pll_info->m_offset;
@@ -259,12 +256,9 @@ static int ingenic_pll_is_enabled(struct clk_hw *hw)
        struct ingenic_cgu *cgu = ingenic_clk->cgu;
        const struct ingenic_cgu_clk_info *clk_info = to_clk_info(ingenic_clk);
        const struct ingenic_cgu_pll_info *pll_info = &clk_info->pll;
-       unsigned long flags;
        u32 ctl;
 
-       spin_lock_irqsave(&cgu->lock, flags);
        ctl = readl(cgu->base + pll_info->reg);
-       spin_unlock_irqrestore(&cgu->lock, flags);
 
        return !!(ctl & BIT(pll_info->enable_bit));
 }
@@ -562,16 +556,12 @@ static int ingenic_clk_is_enabled(struct clk_hw *hw)
        struct ingenic_clk *ingenic_clk = to_ingenic_clk(hw);
        struct ingenic_cgu *cgu = ingenic_clk->cgu;
        const struct ingenic_cgu_clk_info *clk_info;
-       unsigned long flags;
        int enabled = 1;
 
        clk_info = &cgu->clock_info[ingenic_clk->idx];
 
-       if (clk_info->type & CGU_CLK_GATE) {
-               spin_lock_irqsave(&cgu->lock, flags);
+       if (clk_info->type & CGU_CLK_GATE)
                enabled = !ingenic_cgu_gate_get(cgu, &clk_info->gate);
-               spin_unlock_irqrestore(&cgu->lock, flags);
-       }
 
        return enabled;
 }
-- 
2.7.4