From: Claudiu Beznea <[email protected]>
spinlock in rzg2l_mod_clock_endisable() is intended to protect the accesses
to hardware register. There is no need to protect the instructions that set
temporary variable which will be then written to register. With this only
one write to one clock register is executed thus locking/unlocking rmw_lock
is removed.
Signed-off-by: Claudiu Beznea <[email protected]>
---
Changes in v2:
- removed also the spinlock
- s/reduce/remove in patch title
drivers/clk/renesas/rzg2l-cpg.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
diff --git a/drivers/clk/renesas/rzg2l-cpg.c b/drivers/clk/renesas/rzg2l-cpg.c
index f411e428196c..d936832e098f 100644
--- a/drivers/clk/renesas/rzg2l-cpg.c
+++ b/drivers/clk/renesas/rzg2l-cpg.c
@@ -895,7 +895,6 @@ static int rzg2l_mod_clock_endisable(struct clk_hw *hw, bool enable)
struct rzg2l_cpg_priv *priv = clock->priv;
unsigned int reg = clock->off;
struct device *dev = priv->dev;
- unsigned long flags;
u32 bitmask = BIT(clock->bit);
u32 value;
int error;
@@ -907,14 +906,12 @@ static int rzg2l_mod_clock_endisable(struct clk_hw *hw, bool enable)
dev_dbg(dev, "CLK_ON %u/%pC %s\n", CLK_ON_R(reg), hw->clk,
enable ? "ON" : "OFF");
- spin_lock_irqsave(&priv->rmw_lock, flags);
value = bitmask << 16;
if (enable)
value |= bitmask;
- writel(value, priv->base + CLK_ON_R(reg));
- spin_unlock_irqrestore(&priv->rmw_lock, flags);
+ writel(value, priv->base + CLK_ON_R(reg));
if (!enable)
return 0;
--
2.39.2
On Fri, Sep 29, 2023 at 7:39 AM Claudiu <[email protected]> wrote:
> From: Claudiu Beznea <[email protected]>
>
> spinlock in rzg2l_mod_clock_endisable() is intended to protect the accesses
> to hardware register. There is no need to protect the instructions that set
> temporary variable which will be then written to register. With this only
> one write to one clock register is executed thus locking/unlocking rmw_lock
> is removed.
>
> Signed-off-by: Claudiu Beznea <[email protected]>
> ---
>
> Changes in v2:
> - removed also the spinlock
> - s/reduce/remove in patch title
Reviewed-by: Geert Uytterhoeven <[email protected]>
i.e. will queue in renesas-clk-for-v6.7.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- [email protected]
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds