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Frank Oltmannsjernejsk
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clk: sunxi-ng: a64: Set minimum and maximum rate for PLL-MIPI
When the Allwinner A64's TCON0 searches the ideal rate for the connected panel, it may happen that it requests a rate from its parent PLL-MIPI which PLL-MIPI does not support. This happens for example on the Olimex TERES-I laptop where TCON0 requests PLL-MIPI to change to a rate of several GHz which causes the panel to stay blank. It also happens on the pinephone where a rate of less than 500 MHz is requested which causes instabilities on some phones. Set the minimum and maximum rate of Allwinner A64's PLL-MIPI according to the Allwinner User Manual. Fixes: ca1170b ("clk: sunxi-ng: a64: force select PLL_MIPI in TCON0 mux") Reported-by: Diego Roversi <diegor@tiscali.it> Closes: https://groups.google.com/g/linux-sunxi/c/Rh-Uqqa66bw Tested-by: Diego Roversi <diegor@tiscali.it> Cc: stable@vger.kernel.org Reviewed-by: Maxime Ripard <mripard@kernel.org> Signed-off-by: Frank Oltmanns <frank@oltmanns.dev> Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com> Link: https://lore.kernel.org/r/20240310-pinephone-pll-fixes-v4-2-46fc80c83637@oltmanns.dev Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>
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drivers/clk/sunxi-ng/ccu-sun50i-a64.c

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@@ -182,6 +182,8 @@ static struct ccu_nkm pll_mipi_clk = {
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&ccu_nkm_ops,
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CLK_SET_RATE_UNGATE | CLK_SET_RATE_PARENT),
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.features = CCU_FEATURE_CLOSEST_RATE,
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.min_rate = 500000000,
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.max_rate = 1400000000,
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},
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};
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