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clk: x86: Do not gate clocks enabled by the firmware

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Read the enable register to determine if the clock is already in use by
the firmware. In this case avoid gating the clock.

Tested-by: Enric Balletbo i Serra <[email protected]>
Acked-by: Andy Shevchenko <[email protected]>
Acked-by: Darren Hart (VMware) <[email protected]>
Signed-off-by: Carlo Caione <[email protected]>
Fixes: 282a4e4ce5 ("platform/x86: Enable Atom PMC platform clocks")
Signed-off-by: Stephen Boyd <[email protected]>
This commit is contained in:
Carlo Caione authored and Stephen Boyd committed 2017-07-18 16:23:13 -07:00
1 parent f905293d65
commit d31fd43c0f
1 file changed
+7
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drivers/clk/x86/clk-pmc-atom.c
+7
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@@ -186,6 +186,13 @@ static struct clk_plt *plt_clk_register(struct platform_device *pdev, int id,
pclk->reg = base + PMC_CLK_CTL_OFFSET + id * PMC_CLK_CTL_SIZE;
spin_lock_init(&pclk->lock);
/*
* If the clock was already enabled by the firmware mark it as critical
* to avoid it being gated by the clock framework if no driver owns it.
*/
if (plt_clk_is_enabled(&pclk->hw))
init.flags |= CLK_IS_CRITICAL;
ret = devm_clk_hw_register(&pdev->dev, &pclk->hw);
if (ret) {
pclk = ERR_PTR(ret);