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clk: meson: pll: add pcie lock retry workaround 

The PCIe PLL locking may be unreliable under some circumstance, such as
high or low temperature. If the PLL fails to lock, reset it a try again.

This helps on the S905X4

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
[commit message amend]
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Link: https://lore.kernel.org/r/cc80cda0-4dda-2e3e-3fc8-afa97717479b@gmail.com
This commit is contained in:
Heiner Kallweit 2022-08-14 23:25:31 +02:00 committed by Jerome Brunet
parent 19648dddb1
commit d73406ed2d
1 changed files with 8 additions and 4 deletions
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12
drivers/clk/meson/clk-pll.c
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@ -320,12 +320,16 @@ static int meson_clk_pll_is_enabled(struct clk_hw *hw)
static int meson_clk_pcie_pll_enable(struct clk_hw *hw)
{
meson_clk_pll_init(hw);
int retries = 10;
if (meson_clk_pll_wait_lock(hw))
return -EIO;
do {
meson_clk_pll_init(hw);
if (!meson_clk_pll_wait_lock(hw))
return 0;
pr_info("Retry enabling PCIe PLL clock\n");
} while (--retries);
return 0;
return -EIO;
}
static int meson_clk_pll_enable(struct clk_hw *hw)