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

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 <enric.balletbo@collabora.com>
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Darren Hart (VMware) <dvhart@infradead.org>
Signed-off-by: Carlo Caione <carlo@endlessm.com>
Fixes: 282a4e4ce5 ("platform/x86: Enable Atom PMC platform clocks")
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
zero-colors
Carlo Caione 2017-07-14 10:23:56 +02:00 committed by Stephen Boyd
parent f905293d65
commit d31fd43c0f
1 changed files with 7 additions and 0 deletions
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7
drivers/clk/x86/clk-pmc-atom.c
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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);